HACH pHD sc Digital pH Sensor User Manual

**HACH pHD sc Digital pH Sensor User Manual

**

Table of Contents

1. Specifications on page 3
2. General information on page 4
3. Installation on page 6
4. Operation on page 12
5. Maintenance on page 16
6. Troubleshooting on page 20
7. Replacement parts and accessories on page 23

Section 1 Specifications

Specifications are subject to change without notice.

Specification

|

pH sensors

|

Stainless steel pH sensor

|

ORP sensors

---|---|---|---

Dimensions (length)

|

272.5 mm (10.73 in.)

|

325.3 mm (12.81 in.)

|

272.5 mm (10.73 in.)

Weight

|

316 g (11 oz)

|

870 g (31 oz)

|

316 g (11 oz)

Wetted materials

|

PEEK or Ryton (PVDF) body, salt bridge of the same material with Kynar

junction, glass process electrode, titanium ground electrode and Viton O-ring seals Note: The pH sensor with optional HF- resistant glass process electrode has 316 stainless steel ground electrode and perfluoroelastomer wetted O-rings.

|

Immersion mounting only, 316 SS stainless steel body with Ryton (PVDF)

ends and salt bridge

|

PEEK or Ryton (PVDF) body, salt bridge of the same material with Kynar

junction, glass and platinum (or glass and gold) process electrode, titanium ground electrode and Viton O-ring seals

Components

|

Corrosion-resistant materials, fully-submersible

Sensor cable (integral)

|

4-conductor (plus 1 shield), 10 m (33 ft), rated to 105 °C (221 °F)

Operating temperature

|

–5 to 70 °C (23 to 158 °F)

|

0 to 50 °C (32 to 122 °F)

|

–5 to 70 °C (23 to 158 °F)

Storage temperature

|

4 to 70 °C (40 to 158 °F), 0 to 95% relative humidity, non-condensing

Measuring range

|

2.0 to 14.0 pH1 (or 2.00 to 14.00)

|

–1500 to +1500 mV

Repeatability

|

±0.05 pH

|

±2mV

Sensitivity

|

±0.01 pH

|

±0.5 mV2

Stability

|

0.03 pH per 24 hours, non-cumulative

|

2 mV (ORP) per 24 hours, non-cumulative

Maximum flow rate

|

3 m/s (10 ft/s)

Pressure limit

|

6.9 bar at 70 °C (100 psi at 158 °F)

|

Not applicable (immersion only)

|

6.9 bar at 70 °C (100 psi at 158 °F)

Transmission distance

|

100 m (328 ft) maximum or 1000 m (3280 ft) maximum when used with a

termination box

1. Most pH applications are in the 2.5 to 12.5 pH range. The pHD Differential pH sensor with the wide-range glass process electrode operates very well in this range. Some industrial applications require accurate measurement and control below 2 or above 12 pH. In these special cases, please contact the manufacturer for further details.

2. For the best results in solutions that contain zinc, cyanide, cadmium or nickel, use the pHD ORP sensor that has a gold electrode.

Specification

|

pH sensors

|

Stainless steel pH sensor

|

ORP sensors

---|---|---|---

Temperature element

|

NTC 300 Ω thermistor for automatic temperature compensation and analyzer

temperature readout

|

NTC 300 Ω thermistor for analyzer temperature readout only—no automatic

temperature compensation necessary for ORP measurement

Temperature accuracy

|

±0.5 °C (0.9 °F)

Temperature compensation

|

Automatic from –10 to 105 °C (14.0 to 221 °F) with NTC 300 Ω thermistor,

Pt 1000 ohm RTD, or Pt 100 Ω RTD temperature element, or manually fixed at a user-entered temperature

|

Not applicable

Calibration methods

|

1- or 2-point automatic or manual

|

1-point manual

Sensor interface

|

Modbus

Certifications

|

CE

Warranty

|

1 year; 2 years (EU)

Section 2 General information

In no event will the manufacturer be liable for direct, indirect,

special, incidental or consequential damages resulting from any defect or omission in this manual. The manufacturer reserves the right to make changes in this manual and the products it describes at any time, without notice or obligation. Revised editions are found on the manufacturer’s website.

Safety information

The manufacturer is not responsible for any damages due to

misapplication or misuse of this product ncluding, without limitation, direct, incidental and consequential damages, and disclaims such damages to the full xtent permitted under applicable law. The user is soley responsible to identify critical application risks and install appropriate mechanisms to protect processes during a possible equipment malfunction

Please read this entire manual before unpacking, setting up or operating

this equipment. Pay attention to all danger and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment

Make sure that the protection provided by this equipment is not impaired.

Do not use or install this equipment in any manner other than that specified in this manual.

Use of hazard information

D A N G E R

Indicates a potentially or imminently hazardous situation which, if not

avoided, will result in death or serious injury

W A R N I N G

Indicates a potentially or imminently hazardous situation which, if not

avoided, could result in death or serious injury.

C A U T I O N

Indicates a potentially hazardous situation that may result in minor or

moderate injury.

N O T I C E

Indicates a situation which, if not avoided, may cause damage to the

instrument. Information that requires special emphasis.

Precautionary labels

Read all labels and tags attached to the instrument. Personal injury or

damage to the instrument could occur if not observed. A symbol on the instrument is referenced in the manual with a precautionary statement.

|

This is the safety alert symbol. Obey all safety messages that follow

this symbol to avoid potential injury. If on the instrument, refer to the instruction manual for operation or safety information.

---|---

|

This symbol indicates that a risk of electrical shock and/or

electrocution exists.

|

This symbol indicates the presence of devices sensitive to Electro-static

Discharge (ESD) and indicates that care must be taken to prevent damage with the equipment.

|

Electrical equipment marked with this symbol may not be disposed of in

European domestic or public disposal systems. Return old or end-of-life equipment to the manufacturer for disposal at no charge to the user.

Product overview

This sensor is designed to work with a controller for data collection

and operation. Multiple controllers can be used with this sensor. This document assumes sensor installation and use with an sc controller. To use t ensor with other controllers, refer to the user manual for the controller that is used.

This product is not acceptable for use in a Hazardous Location. Optional

equipment, such as mountingrdware for the probe, is supplied with installation instructions. Several mounting options are available, allowing the probe to be adapted for use in many different applications.

Sensor styles

The sensor is available in different styles. Refer to Figure 1.

1. Insertion—for installation in a flow cell or pipe adapter of a ball valve hardware assembly. Allow removal without stopping the process flow.

2. Sanitary—for install in a 2-inch sanitary tee

3. Convertible—for a pipe tee or immersion in an open vesse

4. Stainless steel—for immersion in an open vessel

Insertion sensors—Insertion sensors are similar to convertible sensors,

but the 1-inch NPT threads are only on the cable end for mounting into a flow cell or the pipe adapter of a ball valve hardware assembly. Insert ensors are put into or removed from the process without having to stop the process flow

Convertible sensors —Convertible sensors have 1-inch NPT threads at

both ends of the body for mounting in the configurations that follow:

• into a standard 1-inch NPT pipe tee

• into a pipe adapter for union mounting and a standard 1-½ inch pipe tee

• onto the end of a pipe for immersion into a vesse

Note : Convertible sensors can also be used in existing

installations for 1-½ inch LCP, Ryton and epoxy ensors

.Sanitary sensors —Sanitary sensors feature a built-in 2-inch flange

for mounting into a 2-inch sanitary tee. A special cap and EDPM compound gasket are included with sanitary sensors for use with the sanita ardware.

Stainless steel sensors —Stainless steel sensors have 1-inch NPT

threads at both ends of the body. Stainless steel sensors are for immersion in an open vessel.

Section 3 Installation

W A R N I N G

Explosion hazard. Make sure that the mounting hardware for the sensor

has a temperature and pressure rating sufficient for the mounting location.

C A U T I O N

Personal injury hazard. Broken glass can cause cuts. Use tools and

personal protective equipment to remove broken glass.

N O T I C E

The process electrode at the pH sensor tip has a glass bulb, which can

break. Do not hit or push on the glass bulb.

N O T I C E

The gold or platinum process electrode at the tip of the ORP sensor has

a glass shank (hidden by the salt ridge), which can break. Do not hit or push on the glass shank.

N O T I C E

This instrument is rated for an altitude of 2000 m (6562 ft) maximum.

Although the use of this equipment above the 2000 m altitude does not show any substantial safety concern, the manufacturer recommends that users with concerns contact technical support.

• Install the sensor where the sample that comes into contact with the sensor is representative of the entire process.

• Refer to Figure 2, Figure 3 and Figure 4 for mounting configuration examples.

• Refer to Replacement parts and accessories on page 23 for the available mounting hardware.

• Refer to the instructions supplied with the mounting hardware for installation information.

• Install the sensor at least 15° above horizontal. Refer to Figure 5.

• For immersion installations, put the sensor at least 508 mm (20 in.) from the aeration basin wall and immerse the sensor at least 508 mm (20 in) into the process.

• Remove the protective cap before the sensor is put into the process. Save the protective cap for future use.

• (Optional) If the process water is near the boiling temperature, add gel powder3 to the standard cell solution in the sensor. Refer to step 2 of Replace the salt bridge on page 17. Do not replace the salt bridge.

• Calibrate the sensor before use.

**Figure 2 Mounting examples (1)

**

1. Sanitary mount (2-inch sanitary tee)

2. Union mount (1½-inch standard tee)

3. Immersion mount, chain and bail4

4. Flow-through mount (1-inch standard tee)

Stainless steel sensors only

Figure 3 Mounting examples (2)

1. Insertion mount, CPVC hardware

2. Insertion mount, stainless-steel hardware

**

**

Figure 4 Mounting examples (3)

1. Immersion mount, handrai

2. Immersion mount, ball floa

**

**

**Figure 5 Sensor mounting angle

**

Electrical installation

**Connect the sensor to a quick-connect fitting (non-hazardous

location)**

1. Connect the sensor cable to the quick-connect fitting of the SC controller. Refer to Figure 6. Retain the connector cap to seal the connector opening in case the sensor must be removed.

2. If power is set to on when the sensor is connected:

• SC200 controller—Select TEST/MAINT > SCAN SENSORS.

• SC1000 controller—Select SYSTEM SETUP > DEVICE MANAGEMENT > SCANNING FOR NEW DEVICES.

**Figure 6 Connect the sensor to a quick-connect fitting

**

Extension cables

• Extension cables are available. Refer to Replacement parts and accessories on page 23.

• The maximum cable length is 15 m (49 ft) for an SC1000 controller.

• The maximum cable length is 1000 m (3280 ft) for an SC200 controller.

• SC200 controller—Use a digital termination box if the cable length is more than 100 m (328 ft). Refer to Replacement parts and accessories on page 23.

Connect a sensor cable with bare-wires (non-hazardous location)

D A N G E R

Electrocution hazard. Always remove power to the instrument before

making electrical connections.

D A N G E R

Electrocution hazard. High voltage wiring for the controller is

connected behind the high voltage barrier in the controller enclosure. The barrier must remain in place except when installing modules, or whenualified installation technician is wiring for power, relays or analog and network cards.

If the sensor cable does not have a quick-connect connector5 , connect

the bare wires of the sensor cable to the controller as follows:

For example, if a digital termination box and bulk 4-wire shield cable is

used to increase the sensor cable ength.

Note : A sensor cable with bare wires cannot be connected to an

SC1000 controller.

1. Find the conduit wiring kit (9222400) in the shipping carton for the SC200 controller. The kit contains four splice connectors.

2. Follow the instructions supplied in the conduit wiring kit to connect the sensor cable to the controller

Section 4 Operation

User navigation

Refer to the controller documentation for keypad description and

navigation information. Push the RIGHT arrow key on the controller multiple times to show more information on the home screen and to show graphical display.

Configure the sensor

Select a sensor name and the type of sensor. Change options for

measurement, calibration, data handling and storage.

1. Push menu, then select SENSOR SETUP > [Select Sensor] > CONFIGURE.

2. Select an option.

Option

|

Description

---|---

EDIT NAME

|

Changes the name that corresponds to the sensor on the top of the measure

screen. The name is limited to 12 characters in any combination of letters, numbers, spaces or punctuation

SELECT SENSOR

|

Selects the type of sensor (pH or ORP).

DISPLAY FORMAT

|

For pH sensors only—changes the number of decimal places that are shown

on the measure screen to XX.XX (default) or XX.X

TEMP UNITS

|

Sets the temperature units to °C (default) or °

LOG SETUP

|

Sets the time interval for data storage in the data log—5, 30 seconds, 1,

2, 5, 10, 15 (default), 30, 60 minutes.

AC FREQUENCY

|

Selects the frequency of the AC power supplied to the controller (50 or

60 Hz). If the power to the controller is 120 VAC, select 60 Hz. If the power to the controller is 230 VAC, select 50 Hz

FILTER

|

Sets a time constant to increase signal stability. The time constant

calculates the average value during a specified time—0 (no effect, default) to 60 seconds (average of signal value for 60 seconds). The filter increases the time for the sensor signal to respond to actual changes in the proces

TEMP ELEMENT

|

pH sensors—sets the temperature element for automatic temperature

compensation to PT100, PT1000, NTC300 (default) or MANUAL. If no element is used, the type can be set to MANUAL and a value for temperature compensation can be entered (manual default: 25 °C). ORP sensors—temperature compensation is not used. A temperature element can be connected to measure temperature.

SELECT BUFFER

|

For pH sensors only—Selects the buffer solutions used for calibration.

Options: pH 4, 7, 10 (default) or DIN 19267 (pH 1.09, 4.65, 6.79, 9.23, 12.75) Note: Other buffer solutions can be used for calibration.

PURE H2O COMP

|

For pH sensors only—adds a temperature-dependent correction to the

measured pH value for pure water with additives—NONE (default), AMMONIA, MORPHOLINE or USER DEFINED. For process temperatures above 50 °C, the correction at 50 °C is used. For user-defined applications, a linear slope (default: 0 pH/°C) can be entere

CAL DAYS

|

Sets the calibration interval (default: 60 days). Note: A warning shows

on the controller display when the number of days since the sensor was calibrated is more than the calibration interval

SENSOR DAYS

|

Sets the sensor replacement interval (default: 365 days). Note: A warning

shows on the controller display when the number of days the sensor has been in operation is more than the sensor replacement interval.

IMPED LIMITS

|

Sets the impedance limits for the active and reference electrodes

(default: LOW = 0 MΩ, HIGH = 1000 MΩ). Note: When the IMPED STATUS option on the DIAG/TEST menu is set to ENABLED, an error message shows on the controller display when the impedance of the active or reference electrode is not within the impedance limits

DEFAULT SETUP

|

Sets the configuration settings back to the default settings.

Calibrate the sensor

W A R N I N G

Explosion hazard. Removal of a sensor from a pressurized vessel can be

dangerous. Reduce the process ressure to below 10 psi before removal. If this is not possible, use extreme caution. Refer to th documentation supplied with the mounting hardware for more information.

W A R N I N G

Chemical exposure hazard. Obey laboratory safety procedures and wear all

of the personal protective quipment appropriate to the chemicals that are handled. Refer to the current safety data sheets (MSDS/SDS) for safety protocols.

C A U T I O N

Chemical exposure hazard. Dispose of chemicals and wastes in accordance

with local, regional and national regulations.

About sensor calibration

Calibration adjusts the sensor reading to match the value of one or two

reference solutions. The sen acteristics slowly shift over time and cause the sensor to lose accuracy. The sensor must be calibrated regularly to maintain accuracy. The calibration frequency varies with the application and is best determined by experience.

For pH sensors, a temperature element is used to provide pH readings that

are automatically adjusted to 25 °C for temperature changes that affect the active and reference electrode. This adjustment can be manually set by the customer if the process temperature is constant. Refer to the TEMP ELEMENT option in Configure the sensor on page 12.

pH calibration procedure

Calibrate the pH sensor with one or two reference solutions (1-point or

2-point calibration).

1. Put the sensor in the first reference solution (a buffer or sample of known value). Make sure that the sensor portion of the probe is fully immersed in the liquid. Refer to Figure 7

2. Wait for the sensor and solution temperature to equalize. This can take 30 minutes or more if the temperature difference between the process and reference solution is significant.

3. Push menu, then select SENSOR SETUP > [Select Sensor] > CALIBRATE.

4. Select the type of calibration:

Option

|

Description

---|---

1 POINT AUTO

|

Use one buffer for calibration (e.g., pH 7). The sensor automatically

identifies the buffer during calibration. Note: Make sure to select the correct buffer set in the sensor configuration setting

2 POINT AUTO (recommended)

|

Use two buffers for calibration (e.g., pH 7 and pH 4). The sensor

automatically identifies the buffers during calibration. Note: Make sure to select the correct buffer set in the sensor configuration settings

1 POINT MANUAL

|

Use a sample of known pH value (or one buffer) for calibration. Enter the

pH value during calibration.

2 POINT MANUAL

|

Use two samples of known pH value (or two buffers) for calibration. Enter

the pH values during calibration

5. If the passcode is enabled in the security menu for the controller, enter the passcode

6. Select the option for the output signal during calibration:

Option

|

Description

---|---

ACTIVE

|

The instrument sends the current measured output value during the

calibration procedure

HOLD

|

The sensor output value is held at the current measured value during the

calibration procedure.

TRANSFER

|

A preset output value is sent during calibration. Refer to the controller

user manual to change the preset value.

7. With the sensor in the first reference solution, push confirm. The measured value is shown.

8. If applicable, enter the pH value of the reference solution:

a. Wait for the value to stabilize, then push confirm.

b. Enter the pH value.

Note: If the reference solution is a buffer, find the pH value on

the buffer bottle for the temperature of the buffer. If the reference solution is a sample, determine the pH value of the sample with a different

instrument.

9. For a 2-point calibration, measure the second reference solution as follows:

a. Remove the sensor from the first solution and rinse with clean

water.

b. Put the sensor in the next reference solution, then push confirm.

c. If applicable, wait for the value to stabilize and push confirm.

Enter the pH value.

10. . Review the calibration result:

    •  PASS—The sensor is calibrated and ready to measure samples. The slope and/or offset values are shown.

    • FAIL—The calibration slope or offset is outside of accepted limits. Repeat the calibration with

fresh reference solutions. Clean the sensor if necessary. Refer to Clean

the sensor on page 17.

11. If the calibration passed, push confirm.

12. Return the sensor to the process, then push confirm. The output signal returns to the active state and the measured sample value is shown on the measure screen.

ORP calibration procedure

Calibrate the ORP sensor with one reference solution or a sample of

known value.

1. . Put the sensor in the reference solution or sample. Make sure that the sensor portion of the probe is fully immersed in the solution. Refer to Figure 8.

**Figure 8 Sensor in reference solution or sample

**

2. Push menu, then select SENSOR SETUP > [Select Sensor] > CALIBRATE.

3. Select 1 POINT MANUAL.

4. If the passcode is enabled in the security menu for the controller, enter the passcode.

5. Select the option for the output signal during calibration:

Option

|

Description

---|---

ACTIVE

|

The instrument sends the current measured output value during the

calibration procedure.

HOLD

|

The sensor output value is held at the current measured value during the

calibration procedure.

TRANSFER

|

A preset output value is sent during calibration. Refer to the controller

user manual to change the preset value

6. With the sensor in the reference solution or sample, push confirm. The measured value is shown.

7. Wait for the value to stabilize, then push confirm.

8. Enter the ORP value of the reference solution or sample.

Note: If a reference solution is used for calibration, find the ORP

value on the reference solution bottle. If a sample is used for calibration, measure the ORP value with a secondary verification instrument.

9. Review the calibration result:

   • PASS—The sensor is calibrated and ready to measure samples. The slope and/or offset values are shown.

   • FAIL—The calibration slope or offset is outside of accepted limits. Repeat the calibration with a fresh reference solution. Clean the sensor if necessary. Refer to Clean the sensor on page 17

10. If the calibration passed, push confirm.

11. Return the sensor to the process, then push confirm. The output signal returns to the active state and the measured sample value is shown on the measure screen

Temperature calibration

The instrument is calibrated at the factory for accurate temperature

measurement. Calibrate the temperature to increase accuracy

1. Put the sensor in a container of water.

2. Measure the temperature of the water with an accurate thermometer or independent instrument.

3. Push menu, then select SENSOR SETUP > [Select Sensor] > CALIBRATE.

4. Select TEMP ADJUST > EDIT TEMP, then push confirm.

5. Enter the exact temperature value, then push confirm.

6. Return the sensor to the process, then push confirm.

Exit calibration procedure

1. To exit a calibration, push back.

2. Select an option

Option

|

Description

---|---

ABORT

|

Stop the calibration. A new calibration must start from the beginning.

BACK TO CA

|

Return to the calibration.

LEAVE

|

Exit the calibration temporarily. Access to other menus is allowed. A

calibration for a second sensor (if present) can be started. To return to the calibration, push menu and select SENSOR SETUP > [Select Sensor].

Sensor data and event logs

The sc controller provides a data log and an event log for each sensor.

The data log stores the measurement data at selected intervals (user configurable). The event log shows the events that have occurred.

The data log and event log can be saved in CSV format. Refer to the

controller documentation for instructions.

Modbus registers

A list of Modbus registers is available for network communication. Refer

to the manufacturer’s website for ore information.

Section 5 Maintenance

D A N G E R

Multiple hazards. Only qualified personnel must conduct the tasks

described in this section of the docume

W A R N I N G

Explosion hazard. Removal of a sensor from a pressurized vessel can be

dangerous. Reduce the processeassure to below 10 psi before removal. If this is not possible, use extreme caution. Refer to thdocumentation supplied with the mounting hardware for more information.

W A R N I N G

Chemical exposure hazard. Obey laboratory safety procedures and wear all

of the personal protective equipment appropriate to the chemicals that are handled. Refer to the current safety data sheets (MSDS/SDS) for safety protocols.

C A U T I O N

Chemical exposure hazard. Dispose of chemicals and wastes in accordance

with local, regional and national regulations.

Maintenance schedule

Table 1 shows the recommended schedule of maintenance tasks. Facility

requirements and operatin conditions may increase the frequency of some tasks.

**Table 1 Maintenance schedule

**

Task

|

1 year

|

As necessary

---|---|---

Clean the sensor on page 17

|

|

X6

Replace the salt bridge on page 17

|

X

|

Calibrate the sensor

|

Set by regulatory agencies or experience

Clean the sensor

Pre-requisite: Prepare a mild soap solution with a non-abrasive

dishwashing detergent that does not contain lanolin. Lanolin leaves a film on the electrode surface that can degrade the sensor performance.

Examine the sensor periodically for debris and deposits. Clean the sensor

when there is a buildup of deposits or when performance has degraded.

1. Use a clean, soft cloth to remove loose debris from the end of the sensor. Rinse the sensor with clean, warm water.

2. Soak the sensor for 2 to 3 minutes in the soap solution.

3. Use a soft bristle brush to scrub the entire measuring end of the sensor.

4. If debris remains, soak the measuring end of the sensor in a dilute acid solution such as < 5% HCl for a maximum of 5 minutes.

5. Rinse the sensor with water and then return to the soap solution for 2 to 3 minutes.

6. Rinse the sensor with clean water.

Note : Sensors with antimony electrodes for HF applications may

require additional cleaning. Contact technical support.

Always calibrate the sensor after maintenance procedures are done.

Replace the salt bridge

Replace the salt bridge and the standard cell solution at 1 year

intervals or when calibration fails after the ensor has been cleaned.

Note: A video that shows how to replace the salt bridge is available on

www.Hach.com. Go to the salt bridge webpage and click the Video tab.

Items to collect:

• Adjustable crescent wrench

• Large tweezers

• Salt bridge

• Standard cell solution

• Gel powder7

• ⅛ teaspoon

1. Clean the sensor. Refer to Clean the sensor on page 17.

2. Replace the salt bridge and the standard cell solution. Refer to the illustrated steps that follow If the reservoir for the standard cell solution contains a gel (not usual), use a jet of water from a water pik-type device to remove the old gel at illustrated step 2. (Optional) If the process water is near the boili relature, add gel powder to the new standard cell solution at illustrated step 4 as follows:

a. Pour 1 level bottle cap (⅛ teaspoon) of gel powder into the

reservoir for the standard cell solution.

b. Pour a small amount of fresh standard cell solution into the

reservoir.

c. Mix with the powder until the solution becomes thick.

d. Add small amounts of solution and mix until the gel level is at

the bottom of the salt bridge threads.

e. Check for proper gel level by installing and removing the new

salt bridge. A salt bridge impression should remain on the gel surface.

3. . Calibrate the sensor.

Prepare for storage

For short-term storage (when the sensor is out of the process for more

than one hour), fill the protective cap with pH 4 buffer or distilled water and put the cap back on the sensor. Keep the process electrode an reference junction salt bridge moist to avoid slow response when the sensor is returned to operation.

For extended storage, repeat the short-term storage procedure every 2 to

4 weeks, depending on the environmental conditions. Refer to Specifications on page 3 for temperature storage limits.

Section 6 Troubleshooting

Intermittent data

During calibration, data is not sent to the data log. Thus, the data log

can have areas where the data i termite

Sensor diagnostic and test menu

The sensor diagnostic and test menu shows current and historical

information about the instrument. Refer to Table 2. To access the sensor diagnostic and test menu, push menu, then select SENSOR SETUP > [Select Sensor] > DIAG/TEST.

**Table 2 Sensor DIAG/TEST menu

**

Option

|

Description

---|---

PROBE INFO

|

Shows the sensor type, name, serial number, software version and driver

version.

CAL DATA

|

Shows the pH slope (mV/pH) and date of the last calibration. The pH slope

should be –55 to –61 mV.

SIGNALS

|

SENSOR SIGNAL —Shows the sensor reading in mV. The mV range is –60

to +60 mV (0 mV = pH 7 ). SENS ADC CNTS —Shows the digital number that represents the pH reading. TEMP ADC CNTS —Shows the digital number that represents the temperature reading. ELECTRD STATE —Shows the health of the active and reference electrode (GOOD or BAD). When “BAD” shows, clean the sensor and replace the salt bridge. Replace the sensor if necessary. ACTIVE ELECT —Shows the impedance of the active electrode. REF ELECTRODE —Shows the impedance of the reference electrode. IMPED STATUS —When enabled (recommended), the impedance of the active and reference electrode are measured at 1 minute intervals. An error shows on the controller display when the impedance of the active or reference electrode is not between the low and high impedance limits.

COUNTERS

|

SENSOR DAYS —Shows the number of days the sensor has been in

operation. RESET SENSOR —Sets the SENSOR DAYS and the ELECTRODE DAYS value to zero. ELECTRODE DAYS —Shows the number of days since the salt bridge was replaced. Note : The ELECTRODE DAYS value is automatically set to zero when the salt bridge is replaced.

Error messages

When an error occurs, the reading on the measurement screen flashes and

all outputs are held when specified in the controller menu. To show the sensor errors, push menu and select DIAGNOSTICS > [Select Sensor] > ERROR LIST. A list of possible errors is shown in Table 3.

**Table 3 Error messages

**

Error

|

Description

|

Resolution

---|---|---

PH TOO HIGH

|

The measured pH is > 14.

|

Calibrate the sen

ORP TOO HIGH

|

The measured ORP value is > 2100 mV

PH TOO LOW

|

The measured pH is < 0.

|

Calibrate the sensor

ORP TOO LOW

|

The measured ORP value is ≤ 2100 mV.

OFFSET TOO HIGH

|

The offset is > 9 (pH) or 200 mV (ORP)

|

Do the steps in Clean the sensor on page 17 and Replace the salt bridge

on page 17. Then, do the calibration again.

OFFSET TOO LOW

|

The offset is < 5 (pH) or – 200 mV (ORP)

SLOPE TOO HIGH

|

The slope is > 62 (pH)/1.3 (ORP).

|

Repeat the calibration with fresh reference solutions

SLOPE TOO LOW

|

The slope is < 50 (pH)/0.7 (ORP)

|

Do the steps in Clean the sensor on page 17. Then, do the calibration

again.

TEMP TOO HIGH

|

The measured temperature is >130 °C.

|

Make sure that the correct temperature element is selected. Refer to the

TEMP ELEMENT option in Configure the sensor on page 1

TEMP TOO LOW

|

The measured temperature is ≤ 10 °C.

ADC FAILURE

|

The analog to digital conversion failed

|

Set the controller to off. Then, set the controller to on.

A ELEC TOO HIGH

|

The active electrode impedance is > 900 MΩ.

|

The sensor is in air. Return the sensor to the process.

A ELEC TOO LOW

|

The active electrode impedance is < 8 MΩ.

|

The sensor is damaged or dirty. Do the steps in Clean the sensor on page

R ELEC TOO HIGH

|

The reference electrode impedance is > 900 MΩ.

|

The standard cell solution leaked or evaporated. Replace the standard

cell solution

R ELEC TOO LOW

|

The reference electrode impedance is < 8 MΩ.

|

The reference electrode is damaged. Replace the sensor

SAME BUFFER

|

The buffers used for 2 POINT AUTO calibration have the same value.

|

Use buffers that have different values.

SENSOR MISSING

|

The sensor is missing or disconnected.

|

Identify if the sensor cable is disconnected or has damage.

TEMP SENSOR MISSING

|

The temperature sensor is missing.

|

Make sure that the correct temperature element is selected. Refer to the

TEMP ELEMENT option in Configure the sensor on page 12.

GLASS IMP LOW

|

The glass bulb is broken or is at end of life.

|

Replace the sensor.

Warning messages

A warning does not affect the operation of menus, relays and outputs. A

warning icon flashes and a message is shown on the bottom of the measurement screen. To show the sensor warnings, push menu and se GNOSTICS > [Select Sensor] > WARNING LIST. A list of possible warnings is shown in Table 4.

**Table 4 Warning messages

**

Warning

|

Description

|

Resolution

---|---|---

PH TOO HIGH

|

The measured pH is > 13

|

Calibrate the sensor.

ORP TOO HIGH

|

The measured ORP value is > 2100 mV.

PH TOO LOW

|

The measured pH is < 1.

|

Calibrate the senso

ORP TOO LOW

|

The measured ORP value is < –2100 mV.

OFFSET TOO HIGH

|

The offset is > 8 (pH) or 200 mV (ORP).

|

Do the steps in Clean the sensor on page 17 and Replace the salt bridge

on page 17. Thendo the calibration again

OFFSET TOO LOW

|

The offset is < 6 (pH) or –200 mV (ORP)

SLOPE TOO HIGH

|

The slope is > 60 (pH)/1.3 (ORP).

|

Repeat the calibration with fresh reference solutions

SLOPE TOO LOW

|

The slope is < 54 (pH)/0.7 (ORP).

|

Do the steps in Clean the sensor on page 17. Then, do the calibration

again.

TEMP TOO HIGH

|

The measured temperature is >100 °C.

|

Make sure that the correct temperature element is selected. Refer to the

TEMP ELEMENT option in Configure the sensor on page 12.

TEMP TOO LOW

|

The measured temperature is < 0 °C.

CAL OVERDUE

|

The number of days since the sensor was calibrated is more than the

calibration interval.

|

Calibrate the sensor. Note: To change the calibration interval, refer to

the CAL DAYS option in Configure the sensor on page 12.

REPLACE SENSOR

|

The number of days the sensor has been in operation is more than the

sensor replacement interva

|

Replace the sensor if necessary. Note: To change the sensor replacement

interval, refer to the SENSOR DAYS option in Configure the sensor on page 12.

NOT CALIBRATED

|

The sensor has not been calibrated.

|

Calibrate the sensor.

FLASH FAILURE

|

External flash memory failed.

|

Contact technical support

A ELEC TOO HIGH T

|

The active electrode impedance is > 800 MΩ.

|

The sensor is in air. Return the sensor to the process

A ELEC TOO LOW

|

The active electrode impedance is < 15 MΩ.

|

The sensor is damaged or dirty. Do the steps in Clean the sensor on page

R ELEC TOO HIGH

|

The reference electrode impedance is > 800 MΩ.

|

The standard cell solution leaked or evaporated. Replace the standard

cell solution.

R ELEC TOO LOW

|

The reference electrode impedance is < 15 MΩ.

|

The reference electrode is damaged. Replace the senso

CAL IN PROGRES

|

A calibration was started but not completed.

|

Return to calibration.

Event list

The event list shows current activities such as configuration changes,

alarms, warning conditions, etc. To show the events, push menu and select DIAGNOSTICS > [Select Sensor] > EVENTS. A list of possible events is hown in Table 5. Previous events are recorded in the event log, which can be downloaded from the controller. Refer to the controller documentation for data retrieval options.

Event

|

Description

---|---

CAL READY

|

The sensor is ready for calibration.

CAL OK

|

The current calibration is good.

TIME EXPIRED

|

The stabilization time during calibration expired.

NO BUFFER

|

No buffer is detected.

Event

|

Description

SLOPE HIGH

|

The calibration slope is above the upper limit.

SLOPE LOW

|

The calibration slope is below the lower limit.

OFFSET HIGH

|

The calibration offset value for the sensor is above the upper limit.

OFFSET LOW

|

The calibration offset value for the sensor is below the lower limit.

POINTS CLOSE

|

The calibration points are too similar in value for a 2-point

calibration.

CAL FAIL

|

The calibration failed.

CAL HIGH

|

The calibration value is above the upper limit.

UNSTABLE

|

The reading during calibration was unstable.

CHANGE IN CONFIG – float

|

The configuration was changed—floating point type.

CHANGE IN CONFIG – text

|

The configuration was changed—text type.

CHANGE IN CONFIG – int

|

The configuration was changed—integer value type.

RESET CONFIG

|

The configuration settings were set to the default options.

POWER ON EVENT

|

The power was set to on.

ADC FAILURE

|

The ADC conversion failed (hardware failure).

FLASH ERASE

|

The flash memory was erased.

TEMPERATURE

|

The recorded temperature is too high or too low.

1PT MANUAL START

|

Start of 1 POINT MANUAL calibration.

1PT AUTO START

|

Start of 1 POINT AUTO calibration for pH.

2PT MANUAL START

|

Start of 2 POINT MANUAL calibration for pH.

2PT AUTO START

|

Start of 2 POINT AUTO for pH.

1PT MANUAL END

|

End of 1 POINT MANUAL calibration.

1PT AUTO END

|

End of 1 POINT AUTO calibration for pH.

2PT MANUAL END

|

End of 2 POINT MANUAL calibration for pH.

2PT AUTO END

|

End of 2 POINT AUTO calibration for pH.

Section 7 Replacement parts and accessories

W A R N I N G

Personal injury hazard. Use of non-approved parts may cause personal

injury, damage to th instrument or equipment malfunction. The replacement parts in this section are approved by the manufacturer.

Note : Product and Article numbers may vary for some selling

regions. Contact the appropriate distributor or refer to the company website for contact information.

Consumables

Description

|

Quantity

|

Item no.

---|---|---

Buffer Solution, pH 4.01, red

|

500 mL

|

2283449

Buffer Solution, pH 7.00, yellow

|

500 mL

|

2283549

**Consumables (continued)

**

Description

|

Quantity

|

Item no.

---|---|---

Buffer Solution, pH 10.01, blue

|

500 mL

|

2283649

ORP Reference Solution, 200 mV

|

500 mL

|

25M2A1001-115

ORP Reference Solution, 600 mV

|

500 mL

|

25M2A1002-115

**Replacement parts—pH sensors

**

Description

|

Quantity

|

Item no.

---|---|---

Salt Bridge, PEEK, Kynar (PVDF) outer-junction, with Viton O-rings

|

1

|

SB-P1SV

Salt Bridge, PEEK, Kynar (PVDF) outer-junction, with perfluoroelastomer

O-rings

|

1

|

SB-P1SP8

Salt Bridge, PEEK, ceramic outer-junction, with Viton O-rings

|

1

|

SB-P2SV

Salt Bridge, Ryton, Kynar (PVDF) outer-junction, with Viton O-rings

|

1

|

SB-R1SV

Standard cell solution

|

500 mL

|

25M1A1025-115

Gel powder for standard cell solution

|

2 g

|

25M8A1002-101

**Accessories

**

Description

|

Item no.

---|---

Digital extension cable, 1 m (3.2 ft)

|

6122400

Digital extension cable, 7.7 m (25 ft)

|

5796000

Digital extension cable, 15 m (50 ft)9

|

5796100

Digital extension cable, SC200 controller, 31 m (100 ft)

|

5796200

Digital termination box, SC200 controller10

|

5867000

Sanitary mount hardware, 316 stainless steel, includes 2-inch sanitary

tee and heavy- duty clamp Note: Cap and EPDM compound gasket are supplied with the sensor.

|

**** MH018S8SZ

Union mount hardware, CPVC (chlorinated polyvinyl chloride), includes 1½-

inch standard tee, union pipe with adapter, sealing hub, lock ring and Viton O-ring

|

6131300

Union mount hardware, 316 stainless steel, includes 1½-inch standard tee,

union pipe with adapter, sealing hub, lock ring and Viton O-ring

|

6131400

Flow-through mount hardware, CPVC, includes 1-inch standard tee

|

MH334N4NZ

Flow-through mount hardware, 316 stainless steel, includes 1-inch

standard tee

|

MH314N4MZ

Insertion mount hardware, CPVC, includes 1½-inch ball valve, 1½-inch NPT

close nipple, sensor adapter with two Viton O-rings and wiper, extension pipe, pipe adapter, back tube and lock ring

|

**** 5646300

**Accessories (continued)

**

Insertion mount hardware, 316 stainless steel, includes 1½-inch ball valve, 1½-inch NPT close nipple, sensor adapter with two Viton O-rings and wiper, extension pipe, pipe adapter, back tube and lock ring| ** 5646350
Immersion mount hardware, standard, CPVC, includes 1-inch by 4 ft pipe and 1-inch x 1-inch NPT coupling| 6136400
Immersion mount hardware, standard, 316 stainless steel, includes 1-inch by 4 ft pipe and 1-inch x 1-inch NPT coupling| 6136500
Immersion mount hardware, handrail, includes 1½ inch by 7.5 ft CPVC pipe and pipe clamp assembly| MH236B00Z
Immersion mount hardware, chain, 316 stainless steel, includes stainless steel bail, nuts and washers Note: For stainless steel sensor use only. Does not include chain.| ** 2881900
Immersion mount hardware, ball float, includes 1½ inch by 7.5 ft CPVC pipe, ball float assembly and pipe clamp assembly| 6131000
Sensor guard, convertible style sensor, PEEK| 1000F3374-002
Sensor guard, convertible style sensor, Ryton| 1000F3374-003

References

• Hach | Hach
• Geräte und Reagenzien für die Wasserqualitätsanalyse | Hach
• Hach | Hach

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