triOS Free Chlorine User manual

Free Chlorine
OPERATING INSTRUCTIONS

1
TABLE OF CONTENTS
Table of Contents
1 General Information 2
1.1 Introduction 2
1.2 Health and safety information 3
1.3 Warnings 4
1.4 Users and Operating Requirements 4
1.5 Intended use 5
1.6 Disposal Information 5
1.7 Certicates and Approvals 5
2 Introduction 6
2.1 Product Identication 6
2.2 Scope of Delivery 7
2.3 Measurement Principle and Design 7
3 Commissioning 8
3.1 Preparation of the Sensor for Commissioning 8
3.2 Electrical installation 10
3.3 Interfaces 11
3.4 Measurement 11
4 Use 12
4.1 Installation with Retaining Ring 14
4.2 Installation without Retaining Ring 15
5 Calibration 16
5.1 Manufacturer Calibration 16
5.2 Customer calibration 16
5.3 Measurement properties 17
6 Malfunction and Maintenance 18
6.1 Cleaning and Upkeep 18
6.2 Maintenance and inspection 18
6.2.1 Electrolyte Replacement 19
6.2.2 Membrane cap replacement 19
6.2.3 Sensor Check 20
6.2.4 Storage 20
6.3 Troubleshooting 20
6.3.1 General Troubleshooting 21
6.3.2 Special Troubleshooting on the Sensor 23
6.4 Returns 25
7 Technical Data 26
8 Accessories 27
8.1 Controller 27
8.1.1 TriBox3 27
8.1.2 TriBox mini 27
9 Warranty 28
10 Customer service 29
11 Contact 30
12 Keyword Index 32
Annex 34

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D01-905en201912 Manual eCHEM Free Chlorine
General Information // Free Chlorine
1.1 Introduction
Welcome to TriOS.
We are glad that you have chosen to purchase our chlorine sensor.
The chlorine sensor from the eCHEM sensors product range is an electrochemical sensor for measuring the chlorine concent-
ration in water. This sensor detects free chlorine from inorganic chlorine products (chlorine gas, hypochlorite, etc.). The measu-
ring method has a reduced pH dependency, so that pH uctuations only have a limited impact on the measurement signal. pH
value increases only lead to an approximately 10% reduction of the measuring signal per pH unit.
In this manual, you will primarily only nd information you will need to commission the eCHEM chlorine sensor. Technical
specications can be found in chapter 7.The corresponding operating instructions of the peripheral devices must be observed!
Please note that the user is responsible to comply with local and state regulations for the installation of electronic equipment.
Any damage caused by incorrect use or unprofessional installation will not be covered by the warranty. All sensors and ac-
cessories supplied by TriOS Mess- und Datentechnik GmbH must be installed and operated in accordance with the specica-
tions provided by TriOS Mess- und Datentechnik GmbH. All parts were designed and tested in accordance with international
standards on electronic instruments. The device meets the requirements of the international standards on electromagnetic
compatibility. Please use only original TriOS accessories and cables to ensure reliable and correct operation of the devices.
Before using the device, read the manual carefully, and keep this manual on hand for future reference. Before commissioning
the sensor, please make sure that you have read and understood the following safety precautions. Always make sure that the
sensor is operated correctly. The safety precautions described on the following pages should ensure the reliable and correct
operation of this device and any additional associated devices and should prevent injuries to yourself or other persons and
damage to other equipment.
1 General Information
If the translation is at all dierent from the original German text, the German version is binding.
Copyright Notice
All of the content in this manual, including texts, photographs and graphics, are protected by copyright. Unless expressly
stated otherwise, TriOS Mess- und Datentechnik GmbH is the owner of the copyright. Persons who violate the copyright shall
be liable pursuant to § 106 et seq of the copyright law, they will be warned at their own expense and must pay compensation.
NOTICE

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Free Chlorine // General Information
1.2 Health and safety information
This manual contains important information about health and safety rules. This information is labelled according to the in-
ternational specications of ANSI Z5356 ("Product safety information in product manuals, instructions and other collateral
materials") and must be strictly followed. The following are distinct categories:
Electromagnetic waves
Devices that radiate strong electromagnetic waves can inuence the measurement data or result in a malfunction of the sen-
sor. Avoid using the following devices in the same room as the TriOS sensor: mobile phones, cordless phones, transmitters/
receivers and other electrical devices that produce electromagnetic waves.
Reagents
Follow the safety and operating instructions of the manufacturer when using reagents. Observe the valid Hazardous Materials
Ordinance for reagents (German GefStoV)!
Biological safety
Liquid waste may be a biohazard. Therefore, you should always wear gloves when working with such materials. Please observe
the currently valid biological agents regulation! (German BioStoV)
Waste
When handling liquid waste, observe the regulations on water pollution, drainage and waste disposal.
Tip / Useful Information
Can result in damage to property
Warning / may lead to serious injury or death
Caution / may cause moderate injury
Danger warning / will lead to serious injury or death
DANGER
WARNING
CAUTION
NOTICE

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General Information // Free Chlorine
1.3 Warnings
• The sensor should only be used in drinking water, swimming pool water or sea water, other water qualities should
be tested.
• Any other use is considered improper. In the event of improper use, all warranty claims are void and liability is
excluded.
• The sensor may only be used to determine and control the concentration of free chlorine.
• The sensor is not suitable for checking the absence of chlorine.
• The material resistance should be tested for each application.
• Do not cut, damage or change the cable. Make sure that no heavy objects are placed on the cable and that the
cable is not kinked. Make sure that the cable is not run near hot surfaces.
• Do not place any unsuitable objects near the measuring head as long as the measurement process is running,
as this can cause damage to the membrane or incorrect measurement results.
• Stop operation of the sensor in the event of excessive heat development (i.e. if it is hot to the touch). Switch o
the sensor immediately and unplug the cable from the power supply. Please contact your dealer or the TriOS
customer service.
• Never try to disassemble or modify the electrode body of the sensor if such a procedure is not explicitly
described in this manual. Inspections, modications and repairs may only be carried out by the dealer or
by qualied experts authorized by TriOS.
• If the associated cable is damaged, it must be replaced with an original part by the customer service of
TriOS GmbH.
• When installing the sensor outside Germany, the relevant national regulations must be observed.
• No liability is assumed for personal injury or damage to property resulting from non-observance of these
operating instructions, modication of the sensor or its improper use.
• Devices from TriOS Mess- und Datentechnik GmbH meet the highest safety standards. Repairs to the device
(which involve the replacement of the connecting cable) must be carried out by TriOS Mess- und Datentechnik
GmbH or by a workshop authorized by TriOS. Defective, improper repairs can lead to accidents and injuries.
Do not touch the electrode nger or otherwise contaminate it! Do not remove the coating of the
electrode nger!
1.4 User and Operating Requirements
The chlorine sensor has been developed for use in industry and science. The implementation of chlorine determination with
test kits often requires the handling of hazardous substances.
We assume that the operating personnel are familiar with dealing with dangerous substances based on their professional
training and experience. The operating personnel must be able to correctly understand and implement the safety labels and
information on the packaging and in the package inserts of the test kits.
TriOS does not guarantee the plausibility of the measured values. The user is always responsib-
le for the monitoring and interpretation of the measured values.
NOTICE
DANGER

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1.5 Intended use
The purpose of the eCHEM chlorine sensor is exclusively to measure the concentration of free chlorine as described in this ma-
nual. In this respect, the chlorine sensor can only be operated with a ow cell. Please note the technical data of the accessory
parts. Other uses do not comply with the intended use.
This device has been developed for use in research and industry. It may only be used for the measurement of free chlorine in
aqueous uids such as drinking water, swimming pool water or sea water. The use of other media can damage the sensor. For
the use of the chlorine sensor in other media than those specied in this manual, please contact the customer service of TriOS
Mess- und Datentechnik GmbH (support@trios. de).
According to current scientic knowledge, the device is safe to use when it is handled according to the instructions in this
user manual.
Avoid any contact with the membrane that could scratch or dirty it. This would no longer guarantee
the functionality of the device.
1.6 Disposal Information
At the end of the device’s life or use, the device and its accessories can be returned for environmentally friendly disposal for a
fee (see addressbelow). The preceding professional decontamination of the device must be proven with a certicate. Please
contact us for more details before you send the device back.
Address of the dealer:
TriOS Mess- und Datentechnik GmbH
Bürgermeister-Brötje-Str. 25
D-26180 Rastede
Germany
Telephone: [phone] - 0
Fax: [phone] – 20
1.7 Certicates and Approvals
This product meets all of the requirements of the harmonised European standards. It therefore meets the legal requirements
of the EU guidelines. TriOS Mess- und Datentechnik GmbH conrms the successful testing of the product by axing the CE
marking. (See Annex.)
NOTICE

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Introduction // Free Chlorine
2 Introduction
2.1 Product Identication
All TriOS Mess- und Datentechnik GmbH products have a label, which clearly shows the product designation.
There is also a rating plate on the sensor with the following information that you can use to uniquely identify the product:
Serial number
Product type
Power supply
Interface
In addition to the product bar code, the rating plate includes the TriOS Mess- und Datentechnik GmbH logo and the quality
label.
Please note that the specications given here are for illustration purposes only and may be dierent depending on the version
of the product.

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2.2 Scope of Delivery
The shipment contains the following components:
- Sensor with membrane cap M48.4E
- 100 ml gel electrolyte ECS2.1/GEL
- Fine sandpaper S1
- Operating instructions
Keep the original packaging of the device in case it needs to be returned for repairs.
2.3 Measurement Principle and Design
The chlorine sensor is a membrane-covered potentiostatic
3-electrode measuring cell with a specially arranged counter
electrode. The measuring electrode is covered by a membra-
ne and, together with the reference electrode, is located in
an electrolyte chamber which is separated from the sample
water and contains a special electrolyte.
With this patented measuring method, chlorine diuses
from the sample water through the membrane and triggers
an electrical signal in connection with the electrolyte at the
measuring electrode. This electrical signal is proportional to
the chlorine concentration and is amplied by the sensor
electronics. Due to an integrated temperature compensati-
on, the measuring signal is independent of the temperature
of the sample water.

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Commissioning // Free Chlorine
3 Commissioning
This chapter deals with the commissioning of the chlorine sensor. Please pay particular attention to this section and follow the
safety precautions to protect the sensor from damage and yourself from injury. Prior to electrical installation (chapter 3.2) of
the sensor, it must rst be lled with gel electrolyte as described in chapter 3.1.
Before the sensor is nally put into operation, it must be ensured that it is securely attached and that all connections are
correctly made.
3.1 Preparation of the Sensor for Commissioning
Before commissioning, the membrane cap must rst be lled with electrolyte. Various aspects should be taken into considera-
tion and the following steps should be carried out:
Some electrolytes contain diluted acids. Therefore, observe the warning notices on the
electrolyte bottle. Do not swallow the electrolyte. In case of skin or eye contact with the
electrolyte, rinse the aected areas thoroughly with water. Consult an ophthalmologist if the
eyes are reddened.
The use of warm water is recommended for rinsing o the gel electrolyte residues on the electrode
nger and in the membrane cap.
Gel electrolytes must not be shaken and must be stored upside down or on the sealing cap after
opening.
1. Remove the transparent protective cap from the membrane
cap. Unscrew the loosely screwed membrane cap from the
electrode shaft.
2. Place the membrane cap on a clean surface.
3. Fill the membrane cap with the enclosed electrolyte bubble-
free up to the edge.
4. Then place it on the surface again and check whether air po-
ckets can be detected. If air pockets are detected, carefully
empty the membrane cap. Then rell the membrane cap with
electrolyte bubble-free.
5. This step does not need to be performed the rst time the
sensor is used: Only the tip of the dry electrode nger (=
measuring electrode) is cleaned with the enclosed special
sandpaper. To do this, place the special sandpaper on a paper
towel, hold it at one corner and run the electrode tip of the
vertically held sensor two to three times over the sandpaper.
Important: When unscrewing the lled membrane cap, be sure to push the hose ring to the side at the
marked valve opening so that air can ow into the electrolyte chamber, otherwise the membrane will
be destroyed!
Cleaning with special sandpaper
NOTICE
CAUTION
NOTICE
NOTICE

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The electrolyte can splash out of
the valve opening.
Please note additionally:
Important: Is the membrane cap completely screwed on as far as it will go? The rst screw-in resistance
comes from the sealing O-ring, but the cap must be screwed on further until it hits the shaft.
Caution! If the lled membrane cap is completely screwed onto the sensor, the membrane must not
be touched or knocked against!
Important: When unscrewing the lled membrane cap, be sure to push the hose ring to the side at the
marked valve opening so that air can ow into the electrolyte chamber, otherwise the membrane will
be destroyed!
6. Place the vertically held electrode shaft on the lled membra-
ne cap, possibly rst turn it counterclockwise until the thread
engages, then slowly screw the electrode shaft clockwise (by
hand) into the membrane cap. Excess electrolyte escapes
through a valve. Do not hold the valve closed (see marking).
Wash o spilled electrolyte or electrolyte which gets on your
skin or in your eye with water. The electrolyte may contain di-
luted acids. Observe the warning notices on the electrolyte
bottle. Make sure that the membrane cap is rmly screwed
against the electrode shaft! Rinse o the electrolyte adhering
to the outside with water.
CAUTION
NOTICE
NOTICE

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3.2 Electrical installation
The chlorine sensor is equipped with an 8-pin M12 screw connector for electrical commissioning. The following gure shows
the pin assignment of the connector:
1. RS-485 A (commands)
2. RS-485 B (data)
3. Not assigned
4. Not assigned
5. Not assigned
6. Not assigned
7. Ground (Power + Ser. Interface)
8. Power (9...30 VDC)
Insert the connector into one of the supplied TriOS cables (2m). Additional cable lengths of 0.3 m, 2 m, 5 m, 10 m, 25 m are
oered. Connect the male end of the cable into the connector on the sensor by making the pins align with the slots of the
cable. The next step is to turn the locking sleeve clockwise to secure the end of the connector.
The sensor may only be operated with the specied supply voltage.
Make sure that the supply voltage of the controller is constant! A supply voltage that is too low causes an incorrect measured
value and can lead to dangerous over-metering in a control loop. The sensors must be operated potential-free. There must be
no current ow between the sensors and the measuring medium. Measuring and control devices must therefore have galvanic
isolation.

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3.3 Interfaces
The chlorine sensor with digital signal processing has a digital Modbus RTU interface (RS-485). The pin assignment has already
been explained in more detail in chapter 3.
The interface must be congured as follows:
• Baud rate: 9600 bps
• Data bits: 8
• Stop bits: 1
• Parity: none
• Flow control: none
A detailed description of the Modbus protocol commands can be found in the Annex.
3.4 Measurement
The sensor must be used for measurements in the ow cell type FLC (see chapter 4). The use of the sensor in other ow cells
must be approved byTriOS GmbH. Otherwise, no warranty will be given for the proper functioning of the sensor or for resulting
damage to property or personal injury.
The maximum permissible operating pressure of the sensor is 3.0 bar (with retaining ring). The permitted operating tempera-
ture of the sensor is 0...45 °C water temperature and 0...55 °C ambient temperature. The sensor may only be used to determine
and control the concentration of free chlorine.
As soon as the sensor is supplied with power, it starts measuring automatically. The measured values can be displayed, conver-
ted or stored using a TriOS controller.
Please also refer to the corresponding controller manuals! If the sensor is not recognized by the controller, the conguration of
the interface (see chapter 3.3) should be checked directly.

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4 Use
The chlorine sensor can be operated with all TriOS controllers. Instructions for correct installation can be found in the relevant
controller manual.
A bypass installation of the sensor is essential for correct results. Therefore we strongly recommend to use the sensor in the
ow cell type FLC for permanent use.
A sudden failure of the sensor can lead to dangerous over-metering. Take appropriate precautions in
this case! Check system for odour, check water for abnormal discolouration. In case of strong over-
metering, the DPD-1 measurement can remain colourless because the dye is bleached by the chlorine
present.
Before installing the sensor in the ow cell type FLC, the system must be depressurized. Close the shut-o valves upstream and
downstream of the ow-through tting. Push the sensor slowly into the ow-through tting. The sensor must not be pushed
against the bottom of the tting.
Max. operating pressure of the sensor without retaining ring is 0.5 bar (5 mH2O). Max. operating
pressure of the sensor with retaining ring is 3 bar (30 mH2O).
The following tables give an overview of the permissible operating pressures, temperatures and corresponding ow rates of
the two ow cells oered FLC-1 and FLC-3. It is necessary to distinguish between operation with or without retaining ring.
The use of the sensor without ow cell is not recommended and can lead to loss of warranty.
NOTICE
NOTICE
NOTICE

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Screw connection 1 1/4”
Approx. 122
80.00
Dimensions in mm
18.00 44.00
OUT
IN
30.00 100.00
175.00
Approx. 220
Flow control
Sampling
6/8 mm hose
6/8 mm hose

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Operating mode Flow-through tting Max. operating
pressure
Max. operating tempe-
rature Flow rate L/h
IMPORTANT Observe and adhere to the max. permitted operating pressure / operating temperature of the
sensor!
Sensor operation with
retaining ring
FLC-1 4.0 bar (40mH2O) 45 °C 15 (45)
FLC-3 8.0 bar (80mH2O) 70 °C 45 (15)
The table shows the properties of the FlowCell. The sensor itself must not be operated at more than 3
bar. Higher pressure will damage the sensor.
4.1 Installation with Retaining Ring
For installation in the ow cell, the sensor can be tted with a retaining ring, slide ring and O-ring as shown in the left gure
below.
1. To install the sensor in the tting, unscrew the 1 "¼" screw connection of the ow cell.
2. Remove the slide ring and O-ring from the FlowCell screw connection and attach to the sensor as shown in the gure
below.
3. Before inserting the sensor into the ow cell, prepare the ow cell for commissioning according to chapter 3.1 and
ensure that the retaining ring, slide ring and O-ring are properly attached to the sensor as shown in the lower left gure.
4. Slowly insert the sensor into the ow cell as shown in the gure on the right.
Anschlußbuchse
connector
Elektrodenschaft mit
integrierter Elektronik
electrode shaft
with amplifier
Sicherungsring, retaining ring
Gleitring, slide ring
O-Ring
1_17_02_ZB.skd
Connection socket M12 plug
Electrode shaft
with integrated
electronics
Retaining ring
Slide ring
O-ring
Sensor
Screw connection 1 1/4“
Retaining ring
Slide ring
O-ring 25x2.5 (silicone)
O-ring holder
O-ring 30x2.6 (Viton)
FLC-3
The slide ring and the O-ring are included in the scope of delivery of the FlowCell.
Are located in the
screw connection
of the FlowCell
5. Carefully slide the previously unscrewed 1 ¼" screw connection over the sensor inserted in the tting and screw tight,
otherwise leaks may occur!
6. First open the sample water drain, then slowly open the sample water inlet. Avoid installations that create air bubbles
in the sample water.
NOTICE

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Operating mode Flow-through tting Max. operating
pressure
Max. operating tempe-
rature Flow rate L/h
IMPORTANT Observe and adhere to the max. permitted operating pressure / operating temperature of the
sensor!
Sensor operation wit-
hout retaining ring
FLC-1
0.5 bar (5 mH2O)
45 °C 15 (45)
FLC-3 70 °C 45 (15)
4.2 Installation without Retaining Ring
If the sensor is not equipped with a retaining ring, slide ring and O-ring, it can also be installed in the ow cell using an O-ring
and 2 slide rings. The 2nd slide ring is to be used instead of the retaining ring.
1. Loosen the 1 ¼" screw connection of the tting and push the sensor prepared for commissioning according to chapter
3.1 into the tting until the distance between the membrane and the inlet opening is approx. 2 cm.
2. Screw the 1 ¼" screw connection tight. Ensure that the sensor is rmly seated, otherwise it may be pushed out of the
ow cell and/or leakage may occur.
3. First open the sample water drain, then slowly open the sample water inlet. Avoid installations that create air bubbles
in the sample water.

16
Use
Use
Calibration
Calibration
Malfunction and
Maintenance
Malfunction and
Maintenance
Comm-
issioning
Comm-
issioning
Introduction
Introduction
General
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FAQ
Technical
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D01-905en201912 Manual eCHEM Free Chlorine
Calibration // Free Chlorine
5 Calibration
5.1 Manufacturer Calibration
No manufacturer calibration is performed due to application-related changes in measured values (pH, inow velocity, etc.). The
sensors are only tested under standard conditions (concentration, pH, inow velocity etc.) in an endurance test.
5.2 Customer calibration
A customer calibration using the DPD-1 method ("free chlorine") must be carried out in the application. The installation and
other conditions must match the nal application.
Recommendation: Weekly control, if necessary more frequently. In case of a necessary recalibration, operation with a TriOS
controller is recommended. An integrated wizard guides the user step by step through a calibration menu. The value determi-
ned analytically in parallel by the DPD method is set as the reference value in the controller.
Please note the following explanations for direct Modbus access:
Calibration
The values for zero point (X_Null), slope (X_Span) and then date and time are written to the sensor. The sensor electronics
accepts the new calibration data if the date stamp is sent within approx. 5 seconds following the values. If the date diers from
that of the last calibration, the new values are stored in the history memory and the oldest values are overwritten.
Date / Time stamp
• Data type: unsigned long
• 232 = 4294967296
• Year: (20)42, Month: [94], Day [96], Hour [72], Min: [96]
• Last possible date: 31.12.2042, 23:59

17
Use
Use
Calibration
Calibration
Malfunction and
Maintenance
Malfunction and
Maintenance
Comm-
issioning
Comm-
issioning
Introduction
Introduction
General
Information
General
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FAQ
Technical
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D01-905en201912 Manual eCHEM Free Chlorine
Free Chlorine // Calibration
5.3 Measurement properties
The following instructions must be observed when operating the sensor:
• The sensor must be operated in an upright position so that the incoming ow of sample water comes from below
up against the membrane.
• Outgassing sample water interferes with the measurement. During unpressurised operation
with free outow of the sample water gas bubbles have no disturbing eect as long as they
do not cover the membrane. Gas bubbles in front of the membrane prevent the free chlorine from
entering the electrolyte, which falsies the measuring signal.
• A minimum inow velocity (>15 L/h) is required. The ow rate must be constant.
• The service life of the membrane is typically 1 year, but it depends very much on the water quality. Heavy
soiling of the membrane must be avoided!
• The supply voltage of the sensor must not be switched o during interval operation of the measuring
system. The sensor must be permanently connected to the supply voltage. The sensor must not
stand dry.
• The sensor must not be operated for a longer period of time (>1 day) in chlorine free water. There is a risk
that deposits/soiling (e.g. biological) will form on the membrane, which will hinder or block subsequent chlorine
measurement. After operating the sensor in chlorine-free water, run-in times must be expected. If necessary,
switch on dosing with a time delay. If no chlorine is expected over a longer period of time, the sensor must be
separated from the controller, removed and stored in a dry place.
• The presence of reducing and oxidizing agents as well as corrosion inhibitors can interfere with the
measurement.

18
Use
Use
Calibration
Calibration
Malfunction and
Maintenance
Malfunction and
Maintenance
Comm-
issioning
Comm-
issioning
Introduction
Introduction
General
Information
General
Information
FAQ
FAQ
Technical
Data
Technical
Data
Warranty
Warranty
Customer
service
Customer service
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D01-905en201912 Manual eCHEM Free Chlorine
Malfunction and Maintenance // Free Chlorine
6 Malfunction and Maintenance
To ensure error-free and reliable measurement, the chlorine sensor should be cleaned and serviced at regular intervals. When
carrying out maintenance and in the event of a malfunction, the entire system from the extraction point to the drain must
always be taken into account. The system usually consists of:
• Chlorine sensor
• Electrical wiring and connections
• Flow-through ttings and connections
• Measuring and / or control device
• Dosing device
• Analysis kit
Before removing the sensor, downstream controllers should be switched o or switched to manual operation. If the sensor is
removed, an incorrect measured value may occur at the input of the controller and lead to uncontrolled dosing in a control
loop. To perform maintenance tasks, proceed as follows:
1. Shut o the sample water inlet.
2. Shut o the sample water outlet.
3. Remove the electrical connection.
6.1 Cleaning and Upkeep
To ensure a long service life of the chlorine sensor, it should be checked regularly for contamination. Carefully rinse o any
soiling on the outside with water. In case of heavy soiling it is recommended to change the electrolyte and/or the membrane
cap. A detailed description on how to change the electrolyte and the membrane cap is given in the following chapter 6.2.
If you have further questions on this topic, we would be pleased to help you. Please contact our customer service at support@
trios.de.
6.2 Maintenance and inspection
The sensor should be checked regularly for contamination, fouling and bubbles on the outside of the membrane. Avoid con-
tamination of the membrane with particles, condensation etc. as far as possible. Bubbles on the outside of the membrane can
be eliminated by briey increasing the ow rate.
After a membrane cap or electrolyte change, a slope adjustment must be carried out.
The use of warm water is recommended for rinsing o the gel electrolyte residues on the electrode nger
and in the membrane cap.
The coating of the electrode nger must not be sanded down. Do not unscrew the membrane disc
holder from the membrane cap, as the membrane may be damaged and the adjustment may be lost!
NOTICE