APERA PH850-BS Portable pH Meter User Manual

PH850-BS Portable pH Meter

Product Information

The PH850-BS Portable pH Meter is a versatile and cost-effective
portable electrochemical meter designed for industrial and mining
enterprises, power plants, water treatment engineering,
environmental protection industry, and other applications. It
combines advanced electronics technology, sensor technology, and
software design to provide accurate and reliable pH and
conductivity measurements.

The meter features automatic calibration, automatic temperature
compensation, function setup, self-diagnostics, automatic
power-off, and low voltage display. It can measure up to 3
parameters simultaneously and switch displays effortlessly. The
digital filter improves measurement speed and accuracy, and the
stable reading indication ensures reliable results.

The package includes a portable case, a meter, electrodes,
standard solutions, and all accessories necessary for field use.
The meter is dustproof and waterproof, meeting the IP57 rating.

Specifications

The pH Measurement Features for Model PH850 and PC850 include
1-3 points automatic calibration, automatic recognition of pH
standard buffer solutions, and three types of reading stability
criteria.

The Conductivity Measurement Features for Model EC850 and PC850
include 1-4 points automatic calibration, automatic recognition of
conductivity standard solutions, and the ability to switch between
conductivity and TDS (Total Dissolved Solids).

Product Usage Instructions

1. Read the manual thoroughly before using the PH850-BS Portable
   pH Meter.

2. Connect the electrodes to the meter.

3. Turn on the meter and select the desired measurement parameter
   (pH, conductivity, or both).

4. If using pH measurement, perform the automatic calibration
   using 1-3 points and follow the calibration guide provided by the
   meter.

5. If using conductivity measurement, perform the automatic
   calibration using 1-4 points and follow the calibration guide
   provided by the meter.

6. For pH measurement, choose the appropriate pH standard buffer
   solution (USA series or NIST series) and the desired reading
   stability criteria.

7. For conductivity measurement, the meter can automatically
   recognize conductivity standard solutions.

8. Dip the electrodes into the sample and wait for stable readings
   to appear on the display.

9. If necessary, perform temperature compensation by selecting the
   appropriate temperature range or enabling automatic temperature
   compensation.

10. After use, clean and store the electrodes properly and turn off
    the meter.

PH850-BS Portable pH Meter
Manual
PH 850 Portable pH Meter EC 850 Portable Cond. Meter PC 850 Portable pH/Cond. Meter
APERA INSTRUMENTS (Europe) GmbH
www.aperainst.de
PC850 Version1.0

Table of Contents 1. Introduction ————————————————————————————————————————— 1 2. Specifications ————————————————————————————————————————-2 3. Instrument Description ————————————————————————————————————-3
3.1. LCD display———————————————————————————————————————- 3 3.2. Keypad functions ————————————————————————————————- ————–3 3.3. Meter socket ———————————————————————————————————————5 3.4. Reading stability display mode ——————————————————————————————-5–3.5. Automatic lock-up display mode —————————————————————————————— 5 3.6. Automatic power off ——————————————————————————————————— 5 3.7. Temperature adjustment —————————————————————————————————- 5 4. pH measurement ———————————————————————————————————————6 4.1. pH electrode information——————————————————————————————————64.2. pH calibration consideration ————————————————————————————————-6 4.3. pH calibration ——————————————————————————————————————–7 4.4. Sample test ———————————————————————————————————————-8 4.5. pH electrode maintenance———————————————————————————————– —–9 5. mV value measurement————————————————————————————————————1–1 6. Conductivity measurement ——————————————————————————————————-1–26.1. Conductivity electrode information—————————————————————————————–1-26.2. Conductivity calibration ——————————————————————————————————12 6.3. Conductivity calibration——————————————————————————————————-1- 3 6.4. Relationship between TDS and Conductivity —————————————————————————1-4-6.5. Sample test———————————————————————————————————————-1–4 6.6. Conductivity electrode maintenance————————————————————————————–1–57. Parameter setting——————————————————————————————————————–1-57.1. Main menu———————————————————————————————————————–1–5 7.2. Submenu ————————————————————————————————————————1–6 7.3. Submenu of pH parameter setting —————————————————————————————-1-7-7.4. Submenu of Conductivity parameter setting —————————————————————————-1-77.5. Submenu of standard basic parameter setting ———————————————————————– 18 8. Meter Kits——————————————————————————————————————————1-9 9. Warranty——————————————————————————————————————————–1-9 Appendix I: Parameter setting & Factory default setting———————————————————————-2–0 Appendix II: Abbreviation Glossary————————————————————————————————-21 Appendix III: Self- diagnosis information—————————————————————————————— 2212
PC850 Version1.0

1. Introduction
Thanks for purchasing PH850 portable pH meter. This meter is a perfect combination of the most advanced electronics technology, sensor technology, and software design, and is the most cost-effective portable electrochemical meter designed for industrial and mining enterprises, power plants, water treatment engineering, environmental protection industry, etc., especially ideal for general field use.
In order to use and maintain the instrument properly, please read the manual thoroughly before use. (To improve instrument performance constantly, we reserve the right to change the manual and accessories without giving notice in advance.)

1.1. Measurement Parameters

Measurement parameters

PH850

pH/mV

Conductivity

Temperature

EC850

PC850

1.2. Basic Features

The microprocessor-based portable meter features automatic

calibration, automatic temperature compensation, function setup,

self-diagnostics, automatic power-off and low voltage display.

PC850 meter is able to measure up to 3 parameters simultaneously

and switch displays effortlessly. Please see Diagram -1:

two electrodes at most can be fit into the clip to measure 3 parameters

simultaneously.

Diagram-1

The meter’s digital filter improves measurement speed and accuracy. There is a stable reading

indication on the display.

The package includes a portable case, a meter, electrodes, standard solutions and all accessories, which is convenient to use in field.

The meter is dust proof and waterproof, meeting the IP57 rating.

1.3. pH Measurement Features (for Model PH850 and PC850) 1-3 points automatic calibration, the meter provides calibration guide and automatic checking function. The meter is able to recognize pH standard buffer solutions automatically. USA series and NIST series buffer solutions can be selected. The meter provides three types of reading stability criteria.

PC850 Version 1.0

1.4. Conductivity Measurement Features (for Model EC850 and PC850) 1-4 points automatic calibration, the meter provides calibration guide and automatic checking function. The meter is able to switch between conductivity and TDS. The meter is able to recognize conductivity standard solutions automatically.

2. Specifications
2.1. Main specifications

Range

Resolution pH
Accuracy
Temperature compensation
Range

mV

Resolution

Accuracy

Range

Conductivity

Resolution
Accuracy Temperature compensation Electrode constant

Range

Temperature

Resolution

Accuracy

Specifications (0.00~14.00) pH 0.1/0.01 pH ±0.01 pH ±1 digit
(0~100)°C (manual or automatic)
±1,000 mV 1 mV
±0.2% F.S ±1 digit Conductivity: 0~200 mS/cm (divided into five ranges): (0.00~19.99) S/cm; (20.0~199.9) S/cm; (200~1999) S/cm; (2.00~19.99) mS/cm; (20.0~199.9) mS/cm TDS: (0~100) g/l
0.01/0.1/1S/cm 0.01/0.1 mS/cm ±1.0% F.S ±1digit
(0 ~50)°C (manual or automatic)
0.1 / 1 / 10 cm-1 0~100°C
0.1°C
±0.5°C ±1 digit

Models
PH 850 PC 850
EC 850 PC 850
PH 850 EC 850 PC 850

2.2. Other specifications: Power

AAA batteries × 3 (1.5V×3)

IP rating

IP57

Meter: (86×196×33) mm / 335 g

Dimension & Weight

Portable case:(330×270×82)mm/1.3kg

PH850, EC850

Portable case:(370×270×77)mm/1.8kg

PC850

PC850 Version 1.0

3. Instrument Description
3.1. LCD Display

HOLD

Diagram-2

(1) — Parameter mode icons

LCD

(2) — Measurement reading

(3) — Prompts of special display mode

(4) — Units of measurement

(5) — Temperature units (°C and °F)

(6) — Units of pH and conductivity calibration value

(7) — pH and conductivity calibration value, and prompts of special display mode

(8) — Temperature value, and prompts of special display mode

(9) — Temperature compensation icons

ATC — automatic temperature compensation, MTC — manual temperature compensation

(10) — Calibration guide icon

(11) — Stability icon of readings

(12) — Low battery icon, when this icon appears, please replace the battery

(13) — Automatic reading hold icon

3.2. Keypad functions

Diagram-3 Keypad

PC850 Version 1.0

3.2.1. Keypad operations

Short press —– <1.5 seconds; Long press —– >1.5 seconds.

Turn on the meter: Press to turn on the meter.

Turn off the meter: In the measurement mode, press

and hold for 2 seconds to turn off the

meter.

Note: In the calibration mode or the parameter setup mode, pressing is invalid. Please

press

key to return to the measurement mode, then press

to turn off the meter.

Keypad

Chart -1 Keypad operations and descriptions

Operations

Descriptions

Short press Long press

In the power-off mode, press this key to turn on the meter
In the measurement mode, press and hold this key for 2 seconds to turn off the meter.

Short/long press

Select measurement parameters:

pH 850 pH meter:

EC 850 Conductivity meter:

PC 850 pH/Conductivity meter:

In the measurement mode: long press to enter manual temperature

compensation mode, then long press or momentary press this key

to change the temperature value (only one direction).

In the parameter setup mode, press this key to change the serial

number of the main menu and the submenu (only one direction)

In the submenu mode, press this key to change parameters and

setup (only one direction)

Short press

In the measurement mode, press this key to enter in the calibration mode
In the calibration mode or the parameter setup and auto lock-up (HOLD) mode, press this key to return to the measurement mode

Short press

In the measurement mode, press this key to enter in the parameter setup main menu
In the calibration mode, press this key to make calibration In the parameter setup mode, press this key to select programs

PC850 Version 1.0

3.3. Meter socket Models
pH 850 pH meter

Chart-2 Sockets for Meters Photos

Description

BNC socket (right) — connect pH electrode or ORP electrode,
RCA socket (middle) — connect temperature probe

EC 850 Conductivity meter
PC 850 pH/Conductivity meter

Eight-pin socket (left) — connect conductivity electrode
BNC socket (right) — connect pH electrode or ORP electrode,
RCA socket (middle) — connect temperature probe
Eight-pin socket (left) — connect conductivity electrode

3.4. Reading Stability Display Mode When the measuring value is stable, smiley icon appears on LCD, see Diagram ­ 4. If the smiley icon does not appear or flash, please do not get the reading value or make calibration until the measuring value is stable. Per parameter P1.3, there are 3 criteria for stability standard: (Normal), (High), and (Low). The factory default is set “Normal”. “High” is set for stability for longer time, “Low” is set for stability for shorter time. User can select suitable stability criteria according to different testing requirement.

Diagram- 4

3.5. Automatic Lock-Up Display Mode

Select On from parameter P4.6 to turn on automatic lock-up display function.

When the reading value stabilizes more than 10 seconds, the meter locks the

measuring value automatically and displays HOLD icon, see Diagram ­ 5.

In the HOLD mode, press to release lock-up.

3.6. Automatic Power-off

Diagram – 5

The meter will be power-off if there is no operation for 20 minutes. The time of auto power-off can be

set in parameter setting P3.2

3.7. Temperature Adjustment

When the temperature probe does not connect to the meter, long press key, temperature value

flashes, then long press key or short press key to change the temperature value in one

way, and press key to make confirmation.

PC850 Version 1.0

4. pH Measurement
4.1. pH Electrode Information The meter matches LabSen763 Premium-pH-Electrode with built-in temperature sensor to realize automatic temperature compensation. The coating of the electrode is made of stainless steel and is therefore fully food-safe. The pH electrode has two connections: The BNC socket of electrode connects pH socket; RCA socket connects temperature socket. (See operating instructions of LabSen763)

4.2. pH Calibration Consideration 4.2.1. Standard buffer solution The meter uses two series of standard buffer solution: USA series and NIST series, 3 solutions for each series which are corresponding to calibration indication icons. Please see Chart – 3 for the two series of standard buffer solution.

Chart – 3 pH standard buffer solution series

Icons

pH standard buffer solution series

USA series

NIST series

Three-point calibration

4.00 pH 7.00 pH 10.01 pH

4.01 pH 6.86 pH 9.18 pH

4.2.2. Three-point calibration The instrument can perform 1-3 points calibration. The first point calibration must use 7.00 pH (or 6.86 pH) standard solution, then select other standard solution to perform the second and the third point calibration. See chart ­ 4.
Chart – 4 Three-point calibration mode

One-point calibration

USA standard 7.00 pH

NIST standard 6.86 pH

Icons

Suited range
Accuracy
±0.1pH

Two-point calibration

7.00 pH 4.00 pH 6.86 pH 4.01 pH 7.00 pH 10.01 pH 6.86 pH 9.18 pH

Range< 7.00pH Range> 7.00pH

Three-point 7.004.0010.01 pH 6.864.01 9.18 pH
calibration

Large Range

4.2.3. Calibration intervals Calibration intervals depend on the sample, the electrode performance, and the required accuracy. For high accuracy measurements ( ±0.03pH), the meter should be calibrated immediately before
PC850 Version 1.0

taking a measurement. For general accuracy (±0.1pH), the meter can be calibrated and used for approximately one week before the next calibration. The meter must be recalibrated in the following situations: (a) New probe or probe that has not been used for a long time (b) After measuring acid (pH<2) or alkaline solutions (pH>12) (c) After measuring a solution that contains fluoride or a concentrated organic solution (d) If the solution’s temperature differs greatly from the calibration solution temperature

4.3. pH Meter Calibration (with an example of three-point calibration)

4.3.1. First point calibration

(a) Press key to enter into the calibration mode, ” CAL 1 ”

blinks at the top right of LCD and “7.00 pH” blinks at the bottom right of

LCD, indicating using pH 7.00 buffer solution to make the 1st point calibration.

(b) Rinse pH electrode in pure water, allow it to dry, and submerge it in

pH7.00 buffer solution. Stir the solution briefly and allow it to stay in the

buffer solution until a stable reading is reached. When stable icon

displays on LCD, press

key to calibrate, then 1st point calibration is

finished, the meter enters in measurement mode of one-point calibration.

Calibration guide icon displays at the bottom left of LCD. See Diagram-6.

4.3.2. Second point calibration

Press key to enter into the calibration mode, ” CAL 2 ”

blinks at the top right of LCD indicating to make the 2nd point calibration.

Rinse pH electrode in pure water, allow it to dry, and submerge it in

pH4.00 buffer solution. Stir the solution briefly and allow it to stay in the

buffer solution until a stable reading is reached. The meter’s display will

show scanning and locking process of calibration buffer solution at the

bottom right of LCD. When the meter locks 4.00 pH, stable icon displays

on LCD, press key to calibrate the meter. LCD will display electrode

Diagram- 6

slope of acidity range, then 2nd point calibration is finished, the meter enters in measurement mode

of two-point calibration. Calibration guide icons

display at the bottom left of LCD.

4.3.3. Third point calibration

Press key to enter into the calibration mode, ” CAL 3 ” blinks at the top right of LCD indicating

to make the 3rd point calibration. Rinse pH electrode in pure water, allow it to dry, and submerge it in

pH10.01 buffer solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable

reading is reached. The meter’s display will show scanning and locking process of calibration buffer

solution at the bottom right of LCD. When the meter locks 10.01pH, stable icon displays on LCD,

press

key to calibrate the meter. LCD will display electrode slope of alkalinity range, then 3rd

PC850 Version 1.0

point calibration is finished, the meter enters in measurement mode of three- point calibration.

Calibration guide icons

display at the bottom left of LCD.

Notes:

(a) The meter can perform 1-3 points calibration. When the 1st point calibration is done, the meter

will enter in measurement mode of one-point calibration. Two-point and three- point calibration are in

the same manner.

(b) During the calibration process, if measuring value is not stable yet (when does not appear

and the

key is pressed, then Er 2 displays. See chart ­ 5.

(c) To exit from the calibration mode, press key.

4.4. Sample Test 4.4.1. Rinse pH electrode in pure water, allow it to dry, and submerge it in tested solution. Stir the solution briefly and allow it to stay in the tested solution until icon appears on LCD and a stable reading is reached, which is the pH value of tested solution. Diagram ­ 7 is the calibration and measurement process of pH meter

Press to turn on the meter

Press

key to

enter into the

calibration mode.

Press

key to

enter into the

calibration mode.

Press

key to

enter into the

calibration mode.

Submerge the electrode in pH7.00 solution, press
key when icon appears.
Submerge the electrode in pH4.00 solution, press
key when icon appears.
Submerge the electrode in pH10.01solution,press
key when icon appears.

One-point calibration is done, the meter enter in measurement mode

1st point calibration

Two point calibration is done, the meter enter in measurement mode

2nd point calibration

Sample Test

Three point calibration is done, the meter enter in measurement mode

3rd point calibration

Diagram ­ 7 Calibration and measurement process of pH meter

4.4.2. Self-diagnosis information During the process of calibration and measurement, the meter has self-diagnosis functions, indicating the relative information as below, please refer to chart ­ 5.
PC850 Version 1.0

Display Icons

Chart ­ 5 Self-diagnosis information of pH measurement mode

Contents

Check and Fix

Wrong pH buffer solution or the recognition of calibration solution out of range

1. Check whether pH buffer solution is correct. 2. Check whether the meter connects the
electrode well. 3. Check whether the electrode is damaged.

Press key when measuring value is not stable during calibration.

Press

key after

icon appears

During calibration, the measuring value 1. Check whether there are bubbles in glass bulb.

is not stable for 3min.

2. Replace with new pH electrode.

pH electrode performance error zero potential <-60mV or >60mV, slope <75%

1. Check whether there are bubbles in glass bulb. 2. Check whether pH buffer solution is correct. 3. Replace with new pH electrode.

4.4.3. pH temperature principle Please note that the closer the temperature of the sample solution to the calibration solution, the more accurate the readings.

4.4.4. Factory default setting For factory default setting, please refer to parameter setting P1.4 (Item 7.3). All calibration data is deleted and the meter restores to the theory value (zero electric potential of pH is 7.00, the slope is 100%). Some functions restore to the original value (refer to appendix -1). When calibration or measurement fails, please restore the meter to factory default setting and then perform re-calibration or measurement. Please note once set the factory default, all the data deleted will be irretrievable.

4.5. pH Electrode Maintenance 4.5.1. Daily maintenance
The soaking solution contained in the supplied protective bottle is used to maintain activation in the glass bulb and junction. Loosen the capsule, remove the electrode and rinse in pure water before taking a measurement. Insert the electrode and tighten the capsule after measurements to prevent the solution from leaking. If the soaking solution is turbid or moldy, replace the solution. (Preparation: 26g KCL dissolved in 100ml pure water).
The electrode should not be soaked in pure water, protein solution or acid fluoride solution for long periods of time. In addition, do not soak the electrode in organic silicon lipids.
For best accuracy, always keep the meter clean and dry, especially the and electrode connectors. Clean with medical cottons and alcohol if necessary.

4.5.2. Calibration buffer solution For calibration accuracy, the pH of the standard buffer solution must be reliable. The buffer solution
PC850 Version 1.0

should be refreshed often, especially after heavy use.

4.5.3. Protect glass bulb The sensitive glass bulb at the front of the combination electrode should not come in contact with hard surfaces. Scratches or cracks on the electrode will cause inaccurate readings. Before and after each measurement, the electrode should be washed with pure water and dried. Do not clean the glass bulb with a tissue for it will affect the stability of the electrode potential and increase the response time. The electrode should be thoroughly cleaned if a sample sticks to the electrode. Use a solvent if the solution does not appear clean after washing.
4.5.4. Renew glass bulb Electrodes that have been used over a long period of time will become aged. Submerge the electrode in 0.1mol/L hydrochloric acid for 24 hours, then wash the electrode in pure water, then submerge it in soaking solution for 24 hours. The method to prepare 0.1mol/L hydrochloric acid: dilute 9mL hydrochloric acid in pure water to 1000mL. For serious passivation, submerge the bulb in 4% HF (hydrofluoric acid) for 3-5 seconds, and wash it in pure water, then submerge it in the soaking solution for 24 hours to renew it.

4.5.5. Clean contaminated glass bulb and junction (please refer to Chart-6)

Chart ­ 6 Clean contaminated glass bulb and junction

Contamination

Cleaning Solutions

Inorganic metal oxide

Dilute acid less than 1mol/L

Organic lipid

Dilute detergent (weak alkaline)

Resin macromolecule

Dilute alcohol, acetone, ether

Proteinic haematocyte sediment

Acidic enzymatic solution (saccharated yeast tablets)

Paints

Dilute bleacher, peroxide

Note: The electrode housing is polycarbonate. When use cleaning solutions, take cautions on carbon tetrachloride, trichlorethylene, tetrahydrofuran, acetone, etc., which will dissolve the housing and invalidate the electrode.

PC850 Version 1.0

5. mV Value Measurement

5.1. Press

key, and switch the meter to mV measurement mode. Connect ORP electrode (need

to purchase separately) and dip it in sample solution, stir the solution briefly and allow it to stay in the

solution until icon appears and get the reading, which is the ORP value.

ORP stands for Oxidation Reduction Potential. The unit is mV.

5.2. Notes 5.2.1. ORP measurement does not require calibration. When the user is not sure about ORP electrode quality or measuring value, use ORP standard solution to test mV value and see whether ORP electrode or meter works properly.

5.2.2. Clean and Activate ORP Electrode After the electrode has been used over long period of time, the platinum surface will get polluted, which causes inaccurate measurement and slow response. Please refer to the following methods to clean and activate ORP electrode:

(a) For inorganic pollutant, submerge the electrode in 0.1mol/L dilute hydrochloric acid for 30 minutes, then wash it in pure water, then submerge it in the soaking solution for 6 hours.

(b) For organic or lipid pollutant, clean the platinum surface with detergent, then wash it in pure water, then submerge it in the soaking solution for 6 hours.

(c) For heavily polluted platinum surface on which there is oxidation film, polish the platinum surface with toothpaste, then wash it in pure water, then submerge it in the soaking solution for 6 hours.

PC850 Version 1.0

6. Conductivity Measurement

6.1. Conductivity Electrode Information 6.1.1. Conductivity electrode Model 2301T-S plastic conductivity electrode with constant K=1.0 and built-in temperature sensor, can realize automatic temperature compensation. The electrode housing is POM plastic which is corrosion resistant and impact resistant. When submerge the conductivity electrode in solution, stir the solution briefly to eliminate the air bubbles and improve response and stability. 6.1.2. Conductivity electrode constant The meter matches conductivity electrodes of three constants: K=0.1, K=1.0 and K=10.0. Please refer to chart-7 for measuring range. Set constant in parameter setting P2.1 and refer to clause 7.4 Chart ­ 7 Electrode constant and measuring range

Range
Conductivity electrode constant

20 S/cm K=0.1 cm-1

0.5 S/cm~100 mS/cm K=1.0 cm-1

100mS/cm K=10 cm-1

Standard solution

84S/cm 84 S/cm 1413 S/cm 12.88 mS/cm 111.9 mS/cm

6.2. Conductivity Calibration 6.2.1. Conductivity calibration solutions The meter uses conductivity standard solution of 84 S/cm, 1413 S/cm, 12.88 mS/cm and 111.9 mS/cm. The meter can recognize the standard solution automatically, can perform one-point or multipoint calibration (the maximum is four-point calibration). The calibration indication icons correspond to the four standard values ( icon corresponds to two standards). See chart ­ 8: Chart ­ 8 Conductivity standard solution series

Calibration guide icons

Calibration solution series

Range

84 S/cm

0-200 S/cm

1413 S/cm

200-2,000 S/cm

12.88 mS/cm

2-20 mS/cm

111.9 mS/cm

20-200 mS/cm

6.2.2. Calibration intervals (a) The meter is calibrated before leaving the factory and can generally be used right out of the box. (b) Normally perform calibration per month.
(c) For high accuracy measurements or large temperature deviation from the reference temperature (25°C), perform calibration per week.
(d) Use conductivity standard solution to check whether there is error. Perform calibration for large error.
PC850 Version 1.0

(e) For new electrode or factory default setting, perform 3-point or 4-point calibration. Choose closer standard solution to the sample solution to perform 1- point or 2-point calibration.

6.2.3. Reference temperature Reference temperature of factory default is 25°C. Other reference temperature can also be set for range 15°C ­ 30°C. Select per parameter setting P2.2 and see clause 7.4.

6.2.4. Temperature coefficient

The temperature compensation coefficient of the meter setting is 2.0%/°C. However, the conductivity temperature coefficient is different from solutions and concentration. Please refer to chart ­ 9 and the data collected during testing. Set per parameter setting P2.3. and see clause 7.4.
Note: When the coefficient for the temperature compensation is set to 0.00 (no compensation), the measurment value will be based on the current temperature.

Chart -9 Temperature compensation coefficient of special solutions

Solution

Temperature compensation coefficient

NaCl solution

2.12%/°C

5% NaOH solution

1.72%/°C

Dilute ammonia solution

1.88%/°C

10% hydrochloric acid solution

1.32%/°C

5% sulfuric acid solution

0.96%/°C

6.2.5. Avoid contamination of standard solution
Conductivity standard solution has no buffer. Please avoid being contaminated during usage. Before submerging the electrode in standard solution, please wash the electrode and allow it dry. Please do not use the same cup of conductivity standard solution repeatedly, especially for standard solution of low concentration (84S/cm). The contaminated standard solution will affect accuracy.

6.3. Conductivity Calibration (take 1413S/cm as an example) 6.3.1. Rinse the electrode in pure water, allow it to dry, wash with a little of standard solution and submerge it in standard solution. Stir the solution briefly and allow it to stay in the solution until a stable reading is reached.
6.3.2. Press key to enter into the calibration mode. The meter’s display will show blinking “CAL” at the top right, and scanning and locking process of calibration solution at the bottom right. When the meter locks 1413 mS,
PC850 Version 1.0

stable icon will display on LCD. Press key to complete calibration. The meter will return to measuring mode and is displayed on bottom left of the LCD screen. See diagram-8.

6.3.3. For multi-point calibration, please repeat clause 6.3.1-6.3.2 until all the calibration is done. The meter can repeat calibration in the same calibration solution until the stable value is reached.

6.3.4. Notes:

(a) If press key before stable icon

appeared on LCD screen,

Error indication icon Er 2 will be shown. See Chart -11.

(b) Press

key to exit calibration mode.

6.4. Relations between TDS and Conductivity 6.4.1. TDS and conductivity is linear related. The conversion factor is 0.40-1.00. Adjust the factor from parameter P2.4. The factory default setting is 0.71 and please refer to Item 7.4. The meter only needs to be calibrated in Conductivity mode, then after calibration of conductivity, the meter can switch from conductivity to TDS or salinity.

6.4.2 Adjust TDS conversion factor in parameter setting P2.4 according to the data collected during testing and experience. Chart ­ 10 lists some common use Conductivity and TDS conversion factors. This is for your reference only.
Chart ­ 10 Conductivity and TDS conversion factors

Diagram- 8

Conductivity of solution

TDS conversion factor

0-100 S/cm

0.60

100-1,000 S/cm

0.71

1-10 mS/cm

0.81

10-100 mS/cm

0.94

6.5. Sample test 6.5.1. Rinse conductivity electrode in pure water, allow it to dry, and submerge it in the sample solution. Stir the solution briefly and allow it to stay in the sample solution until a stable reading is reached and icon appears on LCD, then get the reading value, which is the conductivity value of the solution.

6.5.2. Press key to switch to TDS.

6.5.3. During the process of calibration and measurement, the meter has self- diagnosis functions, indicating the relative information as below: chart ­ 11.
PC850 Version 1.0

Chart ­ 11 Self-diagnosis information of conductivity measurement mode

Display Icons

Contents

Checking

1. Check whether conductivity calibration

Wrong conductivity calibration solution

solution is correct. 2. Check whether the meter connects the

or the meter recognition of calibration electrode well.

solution out of range

3. Check whether the electrode is

damaged.

Press key when measuring value is

not stable during calibration.

Press

key after icon appears

During calibration, the measuring value is not stable for 3 min.

1. Shake the electrode to eliminate bubbles in electrode head. 2. Replace with new pH electrode.

6.5.4 Factory default setting For factory default setting, please refer to parameter setting P2.5 (Item 7.4). With this function, all calibration data is deleted and the meter restores to the theory value. Some functions restore to the original value (refer to appendix -1). When calibration or measurement fails, please restore the meter to factory default setting and then perform re-calibration or measurement. Please note once set the factory default, all the data deleted will be irretrievable.
6.6. Conductivity electrode maintenance 6.6.1. Always keep the conductivity electrode clean. Before taking a measurement, rinse the electrode in pure water and better to rinse it again in the sample solution. When submerge the electrode in solution, stir the solution briefly to eliminate air bubbles and allow it to stay until a stable reading is reached. For conductivity electrode which is drily stored, soak the electrode in pure water for 5-10 minutes. Rinse the electrode in pure water after measurement.
6.6.2. The interaction rod of Model 2301T-S conductivity electrode is coated with platinum black to minimize electrode polarization and expand measuring range. The platinum black coating adopted our special processing technology which improves the electrode performance and the firmness of the coating. If the platinum black electrode is stained, gently clean the electrode with soft brush in warm water containing detergent or alcohol.

7. Parameter setting
7.1. Main menu In the measurement mode, press key to enter in P1.0, then press P1.0P2.0P3.0. Please refer to diagram ­ 9. P1.0: pH parameter setting menu, P2.0: Conductivity parameter setting menu, P3.0: Basic parameter setting menu.

to switch to main menu:

PC850 Version 1.0

7.2. Submenu 7.2.1. In P1.0 mode, press key to enter in submenu P1.1 of pH parameter setting, then press key to switch among submenu: P1.1P1.2P1.3P1.4, see Diagram ­ 9.
7.2.2. In P2.0 mode, press key to enter in submenu P2.1 of conductivity parameter setting, then press key to switch among submenu: P2.1P2.2P2.3P2.4P2.5, see Diagram­ 9.
7.2.3. In P3.0 mode, press key to enter in submenu P3.1 of basic parameter setting, then press key to switch among submenu: P3.1P3.2P3.3, see Diagram ­ 9.

Main menu of parameter setting

Submenu of pH parameter setting
P1.1 Select pH standard solution P1.2 Select resolution P1.3 Set stability criteria P1.4 Restore to factory setting

Submenu of Cond. parameter setting P2.1 Select electrode constant P2.2 Select reference temp P2.3 Adjust temperature
compensation factor P2.4 Adjust TDS factor P2.5 Restore to factory setup
Submenu of basic parameter setting
P3.1 Select temperature unit P3.2 Automatic power-off setup P3.2 Automatic lock-up setup
Diagram ­ 9 Main menu and submenu of parameter setting
PC850 Version 1.0

7.3. Submenu of pH parameter setting (press

key to switch)

P1.1. ­ Select pH standard solution (USA-NIST)

1. In measurement mode, press key to enter in P1.0 mode,

then press to enter in P1.1.

2. When press

key, USA blinks, press

key to select

USAnIS, press to confirm. USA-USA series; nIS-NIST

series.

3. After confirm parameter, press key to enter in P1.2 mode,

or press key to return to the measurement mode.

P1.2. ­ Select resolution (0.01 ­ 0.1)

1. Press

key, 0.01 blinks, press

key to select 0.010.1,

press key to confirm.

2. After confirm parameter, press key to enter in P1.3 mode,

or press key to return to the measurement mode.

P1.3. ­ Set reading stability criteria (Normal ­ High ­ Low)

1. Press key, nor blinks. Press key to select norHILo,

press

to confirm. Nor ­ Normal, Hi ­ High, Lo ­ Low.

2. After confirm parameter, press key to enter in P1.4 mode, or

press key to return to the measurement mode.

P1.4. ­Restore factory setting (No ­ Yes)

1. Press

key, no blinks. Press key to select noYES,

press to confirm, the meter returns to the measurement

mode. No ­ Do not restore, Yes ­ Restore to factory setting.

2. If don’t select Yes, press key to return to the measurement

mode.

7.4. Submenu of conductivity parameter setting (press

key to switch)

P2.1. ­ Select electrode constant (1.0-10.0-0.1)

1. In P2.0 mode, press key to enter in P2.1 mode, please refer to

the left Diagram.

2. Press

key, 1.0 blinks, then press

key to select

1.010.00.1, press key to confirm.

3. After confirm the parameter, press key to enter in P2.2 mode,

or press key to return to the measurement mode.

P2.2. ­ Select reference temperature (15.0°C-30.0°C)

1. Press key, 25.0°C blinks, then press key to adjust

temperature value 15.0-30.0, press key to confirm.

2. After confirm parameter, press key to enter in P2.3 mode, or

press

key to return to the measurement mode.

PC850 Version 1.0

P2.3. ­ Adjust temperature compensation coefficient (0.009.99%) 1. Press key, 2.00 blinks, press key to adjust temperature compensation coefficient 0.00 ­ 9.99, press key to confirm. 2. After confirm the parameter, press key to enter in mode P2.4 or press key to return to the measurement mode.

P2.4. ­ Adjust TDS factor

1. Press

key, 0.71 blinks, press

key to adjust TDS factor

0.04 ­ 1.00, press key to confirm.

2. After confirm the parameter, press key to enter in mode P2.5

or press key to return to the measurement mode.

P2.5. ­Restore factory setting (No ­ Yes)

1. Press

key, no blinks. Press

key to select noYES,

press to confirm, the meter returns to the measurement mode.

No ­ Do not restore, Yes ­ Restore to factory setting.

2. If don’t select Yes, press mode.

key to return to the measurement

7.5. Submenu of basic parameter setting (press

key to switch)

P3.1. Select temperature unit (°C–°F). 1. In P3.0 mode, press key to enter in P3.1 mode, please refer to the left Diagram. 2. Press key, °C blinks, then press key to select °C°F, press
key to confirm. 3. When parameter is confirmed, press key to enter in mode P3.2
or press key to return to the measurement mode.

P3.2 ­ Automatic power-off setup (102030On) 1. Press key, On blinks, press key to select 102030On
press key to confirm. On ­ turn off automatic power-off; Time unit is minutes. 2. After confirm the parameter, press key to enter in mode P3.3 or press key to return to the measurement mode.

P3.2 ­ Automatic lock-up setup (OffOn) 1. Press key, OFF blinks, press key to select OFFOn, press
to confirm. Off ­ not set; On­set (the reading is automatically
locked when stabilizes10 seconds.)
2. When Parameter is confirmed, press key to return to the measurement mode.

8. Meter Kits

PC850 Version 1.0

No.

Include

Quantity PH850-BS EC850 PC850

PH 850 portable pH meter

1 set

EC 850 portable conductivity meter

1 set

PC 850 portable pH/conductivity meter

1 set

LabSen763

1 pc

201T-F plastic three-in-on pH electrode

1 pc

2301T-S plastic conductivity electrode

1 pc

pH standard buffer solution (4.00 pH /7.00pH/50mL)

1 bottle each

Conductivity calibration solution (1413 S/12.88 mS/50mL)

1 bottle each

Combined electrode clip

1 pc

Portable case

1 pc

Manual

1 book

9. Warranty
We warrant this instrument to be free from defects in material and workmanship and agree to repair or replace free of charge any malfunctioned or damaged product attributable to the responsibility of APERA INSTRUMENTS for a period of THREE YEARS for the instrument and SIX MONTHS for the probe from the delivery. This limited warranty does NOT cover any issues due to: · Accidental damage · Improper use · Normal wear and tear · Transportation · Storage · Failure to follow the product instructions · Unauthorized maintenance, modifications, combination or use with any products, materials or other matter · Unauthorized repair · External causes such as accidents, abuse, or other actions or events beyond our reasonable control.

PC850 Version 1.0

Appendix I: Parameter setting & Factory default setting

Modes Prompts Parameter setting items Abbreviation

Description

P1.1

Select pH buffer solution

USANIST

Restore to factory default
USA

P1.0 pH

P1.2 P1.3

P1.4

P2.1

P2.0 Cond.

P2.2 P2.3 P2.4

P2.5

P3.0 Basic Parameters

P3.1 P3.2 P3.3

Select resolution
Set reading stability criteria
Restore to factory default setting
Select electrode constant
Select reference temperature
Adjust temperature compensation coefficient
Adjust TDS factor
Restore to factory default setting
Select temperature unit
Automatic Power-off setup
Automatic Lock-up setup

0.010.1

0.01

Normal–High–Low Normal

NoYes

No

1.010.00.1

1.0

15~30

25

0.00~9.99

2.00

0.40~1.00

0.71

NoYes

No

/

°C – °F

°C

102030On

20

/

/

Off

PC850 Version 1.0

Modes

Appendix II: Abbreviation Glossary

Prompts

Code and abbreviation

In English

P1.1

Standard buffers

Description Standard buffer solution

P1.0 pH

P1.2 P1.3 P1.4

Resolution

Resolution

Stability criteria

Set up reading stability criteria

Factory default setting Factory default setting

P2.1

Cell

Constant Cell

P2.0 Conductivity

P2.2 P2.3 P2.4

Reference temperature Reference temperature

Temperature

Temperature

compensation coefficient compensation coefficient

Total dissolved solid

TDS

P2.5

Factory default setting Factory default setting

P3.1

/

P3.0 Basic parameters

P3.2

P3.3

/

/ Auto close
/

/ Automatic Power-off
/

Appendix III: Self-diagnosis information

Icons

Self-diagnosis information

pH

Wrong pH buffer solution or the meter recognition of calibration solution out of range

Press

key when measuring value is not stable

during calibration

During calibration, the measuring value is not stable for 3min.

pH electrode performance error (zero potentia-60mV or60mV, slope < 75%

Conductivity

PC850 Version 1.0

APERA INSTRUMENTS (Europe) GmbH
Address: Wilhelm-Muthmann-Str.18 42329 Wuppertal Germany Email: info@aperainst.de Website: www.aperainst.de
Tel. +49 202 51988998
PC850 Version 1.0

References

• Apera Instruments

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