WOHLER WA 335 Water Analyzer Instruction Manual

: June 13, 2024
: WOHLER

Table of Contents

WOHLER WA 335 Water Analyzer
Product Information
Product Usage Instructions
General
- Scope of supply of set
Specifications
Design and function
- Display
Prior to measurement
Measuring the pH value
Measuring with the O2 Probe (option)
Settings
Calibration
Faults
Warranty and service
Declaration of conformity
Short guide
Read User Manual Online (PDF format)
Download This Manual (PDF format)

WOHLER WA 335 Water Analyzer

WOHLER-WA-335-Water-Analyzer-PRODUCT

Product Information

The Water Analyzer is a device used for analyzing water quality. It is equipped with pH, EC, and optional O2 sensors to measure various parameters of water. The device comes with a set of accessories, including a pH probe, batteries, and a measuring beaker.

The device has a compact design with an LCD display for easy reading of measurement results. It is powered by four AAA batteries and has an automatic shut-off function after one hour of inactivity. The pH and EC probes are waterproof (IP67) for durability and reliability.

Product Usage Instructions

Before Measurement

Storage of pH Probe: Ensure proper storage of the pH probe to maintain its performance.
Storage of EC Probe: Follow the recommended storage instructions for the EC probe.
Transport and Storage: Take necessary precautions during transport and storage to protect the device.
Set Contents: Check the contents of the set to ensure all necessary components are included.
Disposal: Dispose of the device and its components according to applicable regulations.
Manufacturer Address: Refer to the user manual for the manufacturer’s address.

Specifications

Measurement Parameters: The device can measure pH, TDS, and temperature.
Measurement Ranges and Accuracy: The specific measurement ranges and accuracies for each parameter are provided in the user manual.
Operating Conditions: The device can operate within a specified temperature range.
Dimensions and Weight: The device has specific dimensions and weight for easy handling.

Device Structure and Function

pH Probe: The pH probe is used to measure the pH value of the water sample. It has a glass ball for accurate measurements.
EC Probe: The EC probe is used to measure the electrical conductivity of the water sample.
O2 Probe (Optional): The optional O2 probe can be used to measure the oxygen content in the water sample.

Follow the instructions provided in the user manual for proper handling and usage of the Water Analyzer. Ensure that the probes are properly connected and calibrated before taking measurements. Store and maintain the probes according to the recommended guidelines to ensure accurate and reliable results.

General

Information about this operating manual

Read these operating instructions carefully. They will enable you to safely operate the Wöhler WA 335 Heating Water Analyzer. Please keep this operating manual in a safe place for future reference.
The Wöhler WA 335 must be used only by professionally trained personnel exclusively for the purpose for which it was designed.
We accept no responsibility for any damage or loss resulting from any failure to observe this operating manual.

Symbols used in this operating manual

CAUTION!
Highlights risks that can lead to damage occurring to the device.

NOTE!
Highlights tips and other useful information.

Proper use
The Wöhler WA 335 measures the conductivity and pH of water. The measuring instrument is designed to monitor the quality of central heating water to VDI 2035, Part 1, Appendix I.

Scope of supply of set

Device	Features

Wöhler WA 335

Heating Water Ana- lyzer

| Measuring instrument
1 EC probe (electric

conductivity, TDS, salinity)

Temperature compen- sated

1 pH probe

Temperature compen- sated

4 AAA batteries 1.5 V
| 1 50 ml graduated

beaker

250 ml| KCI electrolyte

storage solution for pH probe 3 mol/l

25 ml| pH4 calibration soluti-

on

25 ml| pH7 calibration soluti-

on

25 ml| pH10 calibration solu-

tion

250 ml| EC calibration solution

84 µS/cm

250 ml| EC calibration solution

1413 µS/cm

Transport and storage

CAUTION!

Transporting the device improperly can lead to damage occurring to the device and probes!
To avoid damage occurring during transport it is imperative to transport the device in the original case designed for the purpose.

Storing the pH probe

CAUTION!
Ensure the glass bulb of the probe is kept moist at all times. During storage, the glass bulb must be covered by KCI electrolyte storage solution.

A graduated beaker to fill a measured quantity of KCI storage solution is included in the scope of supply.

Store the probe with the transparent cap, but without the probe guard.
Fill the transparent cap with KCI electrolyte storage solution before storing.

Alternatively, it is possible to use tap water as storage solution.

CAUTION!
Never use distilled water as a storage solution!

Storing the EC probe

CAUTION!
Make sure the electrodes do not come into contact with the KCI electrolyte solution (storage solution for the pH probe).

Store the probe in a dry location with the probe guard screwed on.

Disposal
Do not dispose of electronic equipment along with household waste. Dispose of electronic equipment in accordance with applicable environmental regulations. Damaged rechargeable batteries are considered hazardous waste. Dispose of damaged or used rechargeable batteries at the collection points provided.

Manufacturer’s address

Wöhler Technik GmbH

Wöhler-Platz 1, 33181 Bad Wünnenberg, Germany
Email: [email protected].

Specifications

Readings

pH value (automatic temperature compensation)

Range| 2.00-12.00 pH
Accuracy| ± 0.1 pH
Resolution| 0.01 pH
EC electric conductivity
Range| 0-199,9 µS/cm, 9.0-1999 µS/cm

0-19.99 mS/cm, 0-150.0 mS/cm

Accuracy| ±0.1% FS
Resolution| 0.1 µS/cm or mS/cm
TDS (Total Dissolved Solids)
Range| 0-199.9 ppm 0-1999 ppm

0-19.99 ppt, 0-150.0 ppt

Accuracy| ±0.1% FS
Resolution| 0.1 ppm, 1 ppm, 0.01 ppm, 0.1 ppt
TDS factor| 0.30-1.00
Salinity
Range| 0-10.00 ppt, 0-42.00 ppt (seawater)
Accuracy| ±0.1% FS
Resolution| 0.01 ppt, 0.1 ppt
Temperature
Range| -5 to 60.0 °C
Accuracy| ±0.5 °C
Resolution| 0.1 °C
Diluded Oxygen (Probe available as an option)

Range| 0,0 – 199,9 % (0,0 – 30,0 mg/l)
Accuracy| ±3%
Resolution| 0,1

Technical data: Measuring instrument

Storage conditions	5-50 °C, < 90% RH

Operating conditi-

ons

| 5-40 °C, < 80% RH
Temperature

range

of the testing liquid

| 1 – 60,0 °C
Memory capacity| 12 000 data records
Device dimen-

sions

Design and function

Measuring instrument

Probe socket connector
LC-Display
Keypad
Battery compartment
pH probe
For measuring pH
Black connector plug
Probe guard (for measurement)
Transparent protective cap (for storage; to fill with KCI solution)
Glass bulb for measuring pH
Temperature probe (not visible)
EC probe (electric conductivity)
For measuring electric conductivity, TDS (total dissolved solids, number of ions) and salinity
Blue connector plug
Temperature probe (not visible)
Measurement electrodes
Probe guard (for measurement, calibration and storage)
O2 Probe (option)
Temperature probe
O2-electrode

Display

PH pH value
CON Electric conductivity
TDS Total dissolved solids (number of ions in water)
SALT Salinity
DO Dissolved Oxygen
The oxygen probe is not included in the scope of supply.
ATC Automatic Temperature Compensation
CAL Calibration
Temp Temperature
°C / °F Degrees Celsius/degrees Fahrenheit
mV No function
μS Micro Siemens per cm
mS Milli Siemens per cm
ppt Parts per thousand
ppm Parts per million
% Percent
mg/l Milligrams per liter
M Setting when using an oxygen probe (not included in the scope of supply)
HOLD No function
MAX No function
MIN No function
Number of saved data records
Battery status indicator

Display when pH probe is connected (black connector)

pH pH display, left in graphic
ATC Automatic Temperature Compensation
Temp Temperature display
Memo Number of saved data records

Display when EC probe is connected (blue connector)
When the EC probe is connected it is possible to toggle between displayed conductivity, TDS and salinity readings.

Press the EC key to toggle between the three modes.
CON Conductivity displayed in μS/cm or mS/cm, depending on reading
ATC Automatic Temperature Compensation
Temp Temperature display
Memo Number of saved data records
TDS Total Dissolved Solids (number of ions in water) in ppt (parts per thousand)
ATC Automatic Temperature Compensation
Temp Temperature display
Memo Number of saved data records
Salt Salinity in ppt (parts per thousand)
ATC Automatic Temperature Compensation
Temp Temperature display
Memo Number of saved data records

Prior to measurement

Inserting the batteries

Undo the 5 screws on the back of the device, then open the battery compartment.
Insert 4 AAA batteries 1.5 V. Observe correct polarity when inserting the batteries. There are polarity markings in the battery compartment.

Setting and calibrating the device

Set the required settings and run the calibration procedure as described in chapters 10 and 11.

Connecting the probe

CAUTION!
Always switch off the device before connecting or changing probes. The device automatically recognizes the connected probe.

Insert the probe connector into the probe socket connector on the top end of the device. Observe the mating faces of the plug and socket connectors.
Tighten the union nut.

Measuring the pH value

How to use the pH probe

Storage

CAUTION!
Ensure the glass bulb of the probe is kept moist at all times. During storage, the glass bulb should be covered by KCI electrolyte storage solution.

Store the probe with the transparent cap, but without the probe guard.
Fill the transparent cap with KCI electrolyte storage solution before storing.

CAUTION!
Do not touch the glass bulb! Damage and abrasion could destroy the probe.

Prior to measurement

Remove the transparent, protective cap covering the probe.
Rinse the probe with distilled water to remove any soiling.
NOTE!
If the probe was not stored in KCI solution, soak the probe for 30 minutes in a KCI solution before using.
Screw the probe guard onto the pH probe.
Connect the pH probe to the device.
Power on the device.

Measuring

NOTE!
The measuring instrument includes automatic temperature compensation.

Fill the graduated beaker with heating water up to the 30 ml mark.
Immerse the probe in the test sample so that it is completely covered.
Carefully stir the sample to create a homogeneous sample.
NOTE!
Ensure no air bubbles are created.
Read the result of the measurement as soon as the reading has stabilized.

Measuring with the EC probe

Storage and care

CAUTION!
Make sure the electrodes do not come into contact with the KCI solution (storage solution for the pH probe).

Store the probe in a dry location with the probe guard screwed on.
Remove any soiling from the probe using a soft brush and water.
If the electrodes are soiled, place them in distilled water for approx. 15 minutes.

Prior to measurement

If the probe has not been used for a long time, place it in distilled water for 30 minutes prior to taking a measurement. Due to the inert-pair effect, the probe needs some time before it can be used again.

NOTE!
Make sure the probe guard cap is screwed on. This must not be removed during calibration and storage.

Measuring electric conductivity

Connect the probe to the measuring device.
Power on the device.
Immerse the electrodes in the test sample so that they are completely covered.
Carefully stir the sample to create a homogeneous sample. Ensure no air bubbles are created.

NOTE!
The Wöhler WA 335 shows the electrical conductivity in the display. Depending on the measured value, the device automatically selects the unit μS/cm or mS/cm.

Measuring salinity

Proceed as described in point 0.
Press the EC key to enter the Salinity mode.
Proceed as described in point 0.
Press the EC key to enter the TDS mode.

Measuring with the O2 Probe (option)

Storage and Care

CAUTION!
Leave the O2 probe connected to the meter if you do not use the meter. This will considerably reduce the activation time of the probe.

Visual inspection

Inspect the probe
- when you receive it
- if you have not used it for a year
- in case of abnormal readings
Check if there is enaugh electrolyte in the membrane-set.
Only refill electrolyte and replace the membrane set when it is less than ½ full.

Position of the electrode

Cleaning the electrode

Check the central of the electrode surface. It should be clean in the working area (see photo).
Clean the electrode if too many residues have been found on the electrode working area. (Too many residues attached might disturb the chemical reaction during measuring.)
Rotate to unscrew the membrane set from the probe.
CAUTION!
Any electrolyte still present may leak out. Hold the electrode down.
Clean the probe with a soft fiber cloth or if necessary with the fingernail.
Use a knife blade to scrape lightly on the electrode to remove the white residue as below image. Do not scrape the “surface of the working area“ by a knife blade to prevent damage.
Use clean water to wash away the remaining impurities.

Changing the membrane set

NOTE!
Under normal use, the 2 Replacement Membrane Sets enclosed in the package of the O2- Probe will be enough to cover the replacement need for the entire O2 Probe lifetime.

Replace the membrane set when any of the following situations occur:
The probe has been used for more than 1 year
Error E2/E3 , but the probe central working area is clean
Electrolyte less than ½ full
The membrane is broken or wrinkled
Measuring speed is much slower than before
CAUTION!
The structure of the membrane is delicate. Once the membrane set has been removed from the probe, do not re-install the same membrane set, as it might influence the reading.
Change the membrane set as follows:
Unscrew the membrane-set from the probe.
CAUTION!
Any electrolyte still present may leak out. Hold the electrode down.
Clean the probe as described before.
Carefully fill the electrolyte solution into the sprue of the membrane set until it is full.
Screw the new and filled membrane set on the probe.
NOTE!
After that it is normal to find small bubbles inside of the membrane.

Measuring the diluted oxygen

Before the measurement
Connect the O2-Probe to the meter.
Switch the meter on.
The O2 reading is displayed.
NOTE!
If the O2 probe is connected to the device for the first time or after a longer period of time, it may take 10 minutes for the value to stabilize.
With regular use and the “fast” setting, the value will stabilize in a few seconds. The settings for the stabilization time can be made in the settings menu, see chapter 10.6.
Run a 100 % calibration on air, see chapter 11.

Measuring

Dip the probe into the sample. Make sure the electrode is totally immersed when you stir it.
Wait until the reading is stabilized.
Press the O2-key to switch between the units % and mg/l.

Saving readings
To save the measurement value, press the MEM key when in the Measuring mode as soon as the reading has stabilized.

The number of the saved data record is displayed on the bottom right of the display.

Retrieving saved data

Press and hold the Recall key until MEMO flashes in the display.
Use the arrow keys to select the data record you wish to retrieve.
NOTE!
Depending on which probe is connected, either the pH or the EC data records will be displayed.
To return to the Measuring mode, press the ESC key.

Settings

To access the Settings mode, press and hold the SET key for 2 seconds when the device is powered on.
In the Settings mode, press the arrow key to move from one parameter to the next (P10, P20 etc.).
Press the Enter key when the parameter is selected to access the different options (P22, P23 etc.).
Use the arrow keys to select the desired settings.
To exit the Settings mode and return to the Measuring mode without saving the settings press the ESC key.

Seven different parameters are available in the Settings mode:

NOTE!
If a setting applies solely to a special probe, then the corresponding parameter will only be displayed when that probe is connected to the device.

Parameters	pH	EC	O2	Default setting
P10	Delete all data (CLr)	x	x	x
P20	Test pH probe	x
P30	Review calibration values		x

12.88 mS/cm,

51.5 mS/cm

P40| Review cell constant| | x| | 1.00
P50| Setting for conversion factor Cond. >TDS| | x| | 0.5
P60| Applies only to O2 probe (not in scope of supply)| | | x| Fast
P70| Setting the temperature unit| x| x| | °C

Delete all data P10 (clear memory) CLr

CAUTION!
This function deletes all saved data irretrievably.

Press and hold the Set key to access the Settings mode. CLr and P10 are displayed.
Press the Enter key to access parameter P11.
Using the arrow keys, select “Yes” or “No”.
Select “Yes” if you wish to delete all saved data.
Press the Enter key to confirm your selection.

All saved data will be deleted. Parameter P10 is displayed.

Testing the pH probe

Connect the pH probe to the device.
Press and hold the Set key to access the Settings mode, then use the arrow keys to access parameter P20.
Press the Enter key to access parameter P22. A slope value is displayed.
Press the Enter key again to access parameter P23. A further slope value is displayed (as the device allows 3 calibration values, 2 slope values are displayed).
Replace the probe if the slope value is < 75% or > 115%.

Reviewing the calibration readings (electric conductivity)

Connect the EC probe to the device.
Press and hold the Set key to access the Settings mode, then use the arrow keys to access parameter P30.
Press the Enter key.
- Calibration information for P32, P33, P34 and
- P35 will be displayed in succession (conductivity CON in μS/cm and mS/cm).
- P32: Calibration information measurement range 1
- P33: Calibration information measurement range 2
- P34: Calibration information measurement range 3
- P35: Calibration information measurement range 5
Then press the Enter key to return to parameter P30 (CAL).

Reviewing the cell constant (electric conductivity)

The cell constant K expressed in cm-1 indicates the ratio of the distance between the electrodes to the electrode area
K = electrode distance/electrode area (cm-1)
Wear and soiling will cause the cell constant to change over time. Consequently, the cell constant should be set by calibrating with a known value.
The cell constant should be between 0.8-1.2 cm-1.
Connect the EC probe to the device.
Press and hold the Set key to access the Settings mode, then use the arrow keys to access parameter P40.
Press the Enter key.

The cell constants P42, P43, P44 and P45 are displayed in succession (cell constant per measurement range).

Setting the TDS factor
The TDS factor is the value the device uses to convert conductivity measurements to TDS.

NOTE!
The TDS factor to be used depends on the substances dissolved in the water. As a rule, the factor is between 0.50 and 0.70.

Connect the EC probe to the device. It is possible to set the factor for converting conductivity to TDS via parameter P50.
Default setting: 0.50
Adjustment range: 0.30-1.00.
Press and hold the Set key to access the Settings mode, then use the arrow keys to access parameter P50.
Press the Enter key.
Set the factor using the arrow keys.
Press the Enter key to confirm the setting.

Setting the O2-Parameters (Probe not included in delivery)

Press and hold the Set key to access the Settings mode, then use the arrow keys to access parameter P 60.
Press Enter-Key to access P 6.1 mode.

See Temperature Calibration

Anzeige des letzten Temperaturkalibrierwertes: Dieser Wert hilft zur Fehlerbeurteilung bei Fehleranzeige E21 im Display. E21 erscheint, wenn die gemessene Temperatur um 10 ° C von der kalibrierten Temperatur abweicht.
Review last temperature calibration value: This value helps to judge cause when error E21 is shown on the display. E21 appears if the measured temperature and the calibration temperature have 10 ° C difference.

P 6.2 Salinity Compensation
You can manually enter the Salinity Compensation.

Use the salinity value measured by the conductivity probe.
Adjust the salinity value with the arrow keys. (Range 0 bis 42.00 ppt).
Press the Enter key to confirm.

P 6.3 Height from Sea Level

Adjust the “height from sea level” with the arrow keys. (Range: 0 to 3550 m (100 m per step)).
Press the Enter key to confirm.

P 6.4. Stabilization time fast – slow
Default setting: FAS (fast )

SLOW: stabilization time 10 minutes, Advantage: Electrolyte consumption is lower, and less maintenance work to do.
FAS (fast): reading stabilized in a few seconds Disadvantage: Electrolyte consumption is much higher so the need to refill and do probe maintenance is more frequent.

Setting the temperature unit

Default setting: °C
Options: °C or °F
Press and hold the Set key to access the Settings mode, then use the arrow keys to access parameter P70.
Press the Enter key to access the temperature unit setting.
Press the Enter key again to access option P71.
C (default) flashes in the display.
Use the arrow keys to select either °C or °F.
Press the Enter key to confirm the setting.

Calibration

As a rule, the accuracy of measurements depends on the frequency the calibration procedure is carried out.

Calibrating the pH probe

NOTE!
It is recommended that you calibrate the probe frequently. To achieve high measurement accuracy you should run the calibration procedure at 25 °C, for example in the boiler room.

Remove the probe guard from the probe.
To clean the probe, stir it in distilled water or clean tap water.

CAUTION!
Never wipe the probe dry. That could cause the probe to become electrostatically charged, which can lead to erroneous measurement and calibration readings.

NOTE!
Use a fresh calibration solution for each calibration to ensure the solution is not contaminated.

Fill the calibration solution into a transparent container prior to running the calibration procedure; this will allow you to check if the glass bulb is completely covered.

The container must be clean; even better, it should be sterile.

It is essential that you use a dedicated, clean container for each calibration value. Do not use the same container under any circumstances!
Clean the glass bulb following each calibration procedure (pH4, pH 7, pH 10) in a dedicated container filled with clean water! Do not use the same container under any circumstances!

Calibrating pH 7
We recommend that you first calibrate the neutral measuring point (pH 7).

Power on the Wöhler WA 335.
Immerse the pH glass bulb fully in the calibration solution pH7.
Stir carefully for approx. 1 min. ensuring you do not create any bubbles.
To enter the calibration mode press and hold the CAL key for approx. 2 seconds.
As soon as the device recognizes the calibration solution “CAL” and a measurement value, for example, “7.01”, begins to flash in the display
If the displayed value deviates from the setpoint value, use the arrow keys to set the value to 7.00.

SA is displayed after 30 seconds or when the Enter key is pressed. The calibration value is now saved.

Clean the glass bulb in a clean container containing clean water.

Calibrating pH 4 and pH 10

Proceed as described in point 11.1.1.
To store the probe when you have completed the calibration procedures, fill the transparent protective cap with KCI electrolyte storage solution (3 mol/l) and then screw it onto the probe.

Calibrating the EC probe

Calibration interval

Calibrate the probe before the first measurement. The calibration interval is subsequently oriented on the characteristics of the test samples:
< 100 μS/cm: Weekly
Mean measurement range: Monthly
High temperatures: Weekly

CAUTION!
Never wipe the probe dry. That could cause the probe to become electrostatically charged, which can lead to erroneous measurement and calibration readings.

NOTE!
Do not reuse the calibration solution once it has been used. Any contamination could impair the calibration and measurement accuracy as a result.

Calibration solution

Select the calibration solution that as closely as possible approximates the measurement range of your usual test samples.

The calibration value should be at approx. 2/3 of the measurement range.

NOTE!

When measuring heating water with a low salt content (> 10 μS/cm to ≤ 100 μS/cm) it is recommended to use a calibration solution of 84 μS/cm.
When measuring saline heating water (> 100 μS/cm to ≤ 1500 μS/cm) it is recommended to use a calibration solution of 1413 μS/cm.

It is only necessary to run one single-point calibration of the EC probe. Up- to-date calibration data replaces previous calibration data. Calibration values from other measurement ranges that have not been recalibrated are retained

Prior to calibration

Clean the electrodes using a soft brush.
NOTE!
The probe guard must not be removed during the calibration procedure.
Place the probe tip in demineralized or distilled water for approx. 30 min.
Empty the calibration solution into a clean container.
Power on the measuring instrument and immerse the probe in the calibration solution; ensure the electrodes are completely covered.
Stir lightly for approx. 1 minute. Lightly tap the probe to remove any bubbles adhering to the electrodes.
CAUTION!
Make sure the electrodes are completely covered by the calibration solution, but that they do not contact the bottom of the container (screw on the probe guard!).
To enter the calibration mode press and hold the CAL key for approx. 2 seconds.
As soon as the device has measured the conductivity of the calibration solution, the reading flashes in the display
If the displayed value deviates from the setpoint value, use the arrow keys to set the value.
NOTE!
If the arrow key is held down, the value can be set more quickly
As soon as the set value matches the setpoint value, press the Enter key to confirm the reading.
SA is displayed briefly in the display. The device will then switch to the Measuring mode. You have completed the calibration procedure.
NOTE!
It is possible to cancel the calibration procedure at any time without saving the new calibration value. To do so press the ESC key. In that case the old value is retained
CAUTION!
Replace the probe if the error message E16 occurs following calibration.
If necessary, repeat the steps described in this chapter for other measurement ranges.
Clean the EC probe with clean water before repeating the calibration procedure. Use a new container in each case.

O2-Calibratation

Calibration interval

Perform an O2 –calibration before each measurement and after replacing the membrane set.

NOTE!
There is no need to remove the anti-collision hood before the calibration.

Calibration

Connect the O2 – Probe to the meter and switch it on.
Press O2 key to select %.
Hold the probe in the air and wait a few minutes until the reading is stabilized.
Press and hold the CAL key for 2 seconds for 100 % saturation calibration.The CAL Icon is flashing on the LCD.
When the reading is stabilized after some seconds, press ENTER. or
You can stop the calibration by pressing CAL again.
After the calibration the displayed value should be between
Nach der Kalibrierung sollte der angezeigte Wert zwischen 99,0 % und 101,0 % liegen.

Error Message
If the meter cannot perform a correct calibration, ERR will flash on the display.

Possible reasons:

electrolyte level too low
defective probe
insufficient adjustment time

Stabilization period

Under the following conditions, the meter requires an adaptation time of approx. 1 hour.
Switch the device on and leave it for about one hour,
- when the O2 probe has just been connected to the meter
- after changing the membrane set
- after changing the battery

Faults

Fault	Possible cause	Remedy
It is not possible to power on the device.	· Pressed the power on

button too briefly.

· Batteries are flat or battery connection fault

| · Power on again.

· Place the batteries correctly in the compartment or re- place

| · Low battery power| · Replace batteries

· Never use old and new batteries at the same time

pH reading not stable| · Test pH probe too old| · Replace pH probe.
E02| The measured value is below the measurement range.| · Place the probe you are using into normal water at room temperature for 30 minutes until the message E02 is no longer displayed.

· If that fails to resolve the problem, recalibrate the probe.

---|---|---
E03| The measured value is above the measurement range.| · Place the probe you are using into normal water at room temperature for 30 minutes until the message E03 is no longer displayed.

· If that fails to resolve the problem, recalibrate the probe.

E04| Data error| · Check if the measured temperature is above the measurement range. If yes, place the probe you are using in- to normal water at room temperature for 30 minutes until the message E04 is no longer displayed.
E13| Error during pH calibration.| · Run another pH calibration with fresh calibration solution.
E16| Cell constant of the EC probe is outside the measurement range| · Power the measuring instrument on and off several times in succession.

· Recalibrate the EC probe.

E31/E32| Electric circuit error.| · Power the device on and off several times.
---|---|---
—| No connection to the probe| · Check if the probe is properly connected.

· If — continues to be displayed, power the device off and on again.

Warranty and service

Each Wöhler WA 335 Heating Water Analyzer is subjected to rigorous quality control checks and every function is tested before leaving our factory. If used properly for the purpose it was designed the WA 335 is covered by a 12 month warranty, batteries and probes excluded, beginning on the date of sale.

The pH probe and the EC probe are covered by the warranty for a period of 3 months respectively.
This warranty does not cover costs for packaging and transporting the device if returned for repairs. This warranty is null and void if a non-authorized third party carries out re-pairs or modifications to the device.
Providing excellent SERVICE is important to us. It goes without saying that we are at your side when the warranty period expires.
- When you send your measuring instrument to us, we will repair it within a few days and return it via our trusted parcel carrier.
- Our technicians are available on the phone to offer immediate assistance.

Declaration of conformity

WÖHLER Technik GmbH
Wöhler-Platz 1, D-33181 Bad Wünnenberg, Germany

Declares that the product:

Product name: Wöhler WA 335 Heating Water Analyzer

Meets the essential protection requirements laid down in the Directive of the Council on the approximation of the laws of the Member States relating to electromagnetic compatibility (2014/30/EU).

The following standards were used to assess the electromagnetic compatibility of the product: