Swan Analytical Instruments Chematest 42 User manual

Chematest 42
A-96.730.111 / 160124
Chematest 42
Operator’s Manual

© 2023, Swan Analytische Instrumente AG, Switzerland, all rights reserved.
This manual applies to firmware V2.11 and higher.
The information contained in this document is subject to change without notice.
Customer Support
Swan and its representatives maintain a fully trained staff of technical specialists around
the world. For any technical question, contact your nearest Swan representative, or the
manufacturer:
Swan Analytische Instrumente AG
Studbachstrasse 13
8340 Hinwil
Switzerland
Internet: www.swan.ch
E-mail: [email protected]
Document Status
Title: Chematest 42 Operator’s Manual
ID: A-96.730.111
Revision Issue
00 March 2023 First edition

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1
Table of Contents
1. Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1. Instrument Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2. Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3. Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4. CT App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3. Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1. Selecting the Language. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2. Setting Time and Date. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3. Setting up ID and User List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4. Activating Expert Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.5. Setting up Favorites List with Fixed Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.6. Further Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.7. Sensor Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.8. Selecting Method for Turbidity Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4. Photometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1. Basic Rules for Photometry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2. How To Use Reagents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3. Overview of Methods and Reagents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3.1 Chlorine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3.2 Other Disinfectants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4. Notes on Individual Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5. Performing a Photometric Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.6. Automatic Shutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5. Turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1. Basic Rules for Turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2. How to Maintain Measurement Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3. Performing a Turbidity Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.4. Automatic Shutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6. pH and Redox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1. Basic Rules for pH and Redox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.2. Performing a pH Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3. Performing a Redox Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.4. Automatic Shutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

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7. Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1. Basic Rules for Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.2. Performing a Conductivity Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.3. Automatic Shutoff. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8. Additional Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1. Determination of Acid Binding Capacity ACD pH 4.3. . . . . . . . . . . . . . . . . . . . . 30
9. Data Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
9.1. Display of Data History on the Chematest 42 . . . . . . . . . . . . . . . . . . . . . . . . . . 31
9.2. Data Transfer to CT App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10.1. Photometer Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10.2. Turbidimeter Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.2.1 Overview of Verification Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.2.2 Verification Using a Sealed Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.2.3 Wet Verification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.3. Check of Turbidity Cuvette. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.4. Offset Determination (Turbidity) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10.5. Calibration of Turbidity Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.6. Cleaning the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.7. Calibration of pH and Redox Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.7.1 Calibration of the pH Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10.7.2 Calibration of the Redox Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.8. Calibration of the Conductivity Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
10.9. Verification of the Conductivity Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
10.10.Cleaning the Conductivity Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.11.Setting Time and Date. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
11.1. Instrument Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
11.2. Photometric Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
11.3. Turbidity Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
11.4. Sensor-Based Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
12. Menu Explanations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
13. Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
13.1. Reagents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
13.2. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
13.3. Spare Parts and Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

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14. Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
14.1. Instrument Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
14.2. List of Photometric Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
14.3. Nephelometry Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
14.4. Sensor Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
14.4.1 pH and Redox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
14.4.2 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
14.5. Scope of Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Appendix: CT App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

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Safety Instructions
4
Operator’s Manual
1. Safety Instructions
For safe instrument operation, you must read and understand the
instructions in this manual.
Warning notices
The symbols used for safety-related notices have the following
meaning:
WARNING
Severe injuries or damage to the equipment can occur if such
warnings are ignored.
Follow the prevention instructions carefully.
CAUTION
Damage to the equipment, minor injury, malfunctions or incorrect
process can be the consequence if such warnings are ignored.
Follow the prevention instructions carefully.

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Safety Instructions
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Reagents
WARNING
Multiple Hazards
For safe handling of the reagents, you must read and understand
the corresponding Material Safety Data Sheets (MSDS). These
can be downloaded from www.swan.ch.
General Handling Guidelines
Only charge the instrument using a standard type A USB
socket and the supplied USB cable.
Protect from heat and splash water during charging.
When no charging or sensor cable is connected, close both
sockets with the covers.
Do not expose the instrument to direct sunlight or other
sources of heat, especially when charging.
The housing of the Chematest 42 must not be opened except
for the housing parts specified in the maintenance chapter.
The battery must only be replaced by authorized service
personnel.

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Product Description
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2. Product Description
2.1. Instrument Overview
A
B
C
D
E
Sensor socket
Charging socket
Cuvette adapter
Display
Keypad
F
G
H
Cuvette cap
Turbidity cuvette (black
coding ring)
Photometry cuvette (blue
coding ring)
H
CHEMATEST42
35
H
B
A
C
D
E
F
G

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Product Description
7
2.2. Keys
A POWER
to power on or off the instrument
B ARROW UP
to move up in a menu list and to increase digits
C ARROW DOWN
to move down in a menu list and to decrease digits
D EXIT
to exit a menu or command
to move back to the previous menu level
E ENTER
to open a selected sub-menu
to accept an entry
A
B
C
D
E

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Product Description
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2.3. Display
Once the instrument has started up, the main menu is displayed. The
main menu is organized as follows:
Symbols The symbols displayed in the top right corner have the following
meaning:
A Favorites list
The favorites list provides quick access to frequently used methods.
Depending on the configuration, it contains either
the last three methods selected from the method catalogue [B]
(default setting) or
three methods that are defined by the user.
To define the methods that appear in the favorites list, proceed
according to Initial Setup, p. 10.
B Method catalogue
List of all available methods.
C Menu
Access to further instrument functions. Detailed descriptions of all
functions can be found in chapter Menu Explanations, p. 51.
83%
Main Menu
Comb. Cl21 cuv.
Free chlorine
pH Phenol red
Method Catalogue
Menu
A
B
C
Alarm active. See <Menu>/<Diagnostics>/<Alarms> to see all active
alarms.
Bluetooth activated
Battery status (remaining capacity in %)
Instrument is charging
83%

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Product Description
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2.4. CT App
The CT App is a software for communication between the Chematest
42 and a mobile device or PC. The app includes the following func-
tions:
Transfer of the stored measurements and export to a CSV or
Excel file
Editing the user list
Editing the ID list
Switching between different language packs and language se-
lection
For information on installing and using the app, see Appendix: CT
App, p. 71.

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Initial Setup
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3. Initial Setup
3.1. Selecting the Language
Select the applicable language from <Menu>/<Settings>/
<Miscellaneous>/<Language>.
If the required language is not available on the Chematest 42, the CT
App can be used to install a different language pack. See Language
packs, p. 73 for details.
3.2. Setting Time and Date
Set time and date under <Menu>/<Maintenance>/<Set Time>.
3.3. Setting up ID and User List
Selecting
the attributes
to be saved
Navigate to <Menu>/<Settings>/<Identification>/<Attribute> and
select which attributes should be saved with each measurement:
none
user
ID or
user and ID.
Entering the ID
and user list
If applicable, enter the user and ID lists. The user and ID lists can be
edited using the CT App:
Alternatively, the user and ID lists can be entered directly on the
Chematest 42 via the menu items
<Menu>/<Settings>/<Identification>/<ID List> and
<Menu>/<Settings>/<Identification>/<List of Users>.
Edit ID list
Edit User list

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Initial Setup
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3.4. Activating Expert Mode
The user can choose between two types of method guidance for
photometric measurements. This setting can be changed under
<Menu>/<Settings>/<Miscellaneous>/<Expert mode>.
Inactive (default setting):
In this mode, the Chematest 42 displays detailed on-screen
instructions. Recommended for inexperienced users.
Active:
In this mode, the Chematest 42 displays the instructions in
shortened form and requires as few confirmations from the
user as possible.
3.5. Setting up Favorites List with Fixed Entries
By default, the instrument is configured to display the last three
methods selected from the method catalogue [B] in the favorites list.
With this configuration, the favorites list is automatically adjusted
each time a method is selected from the method catalogue.
Alternatively, it is possible to set up a favorites list with fixed entries.
To do this, perform the following steps:
1Select the required methods from the method catalogue [B] in re-
verse order: First method 3, then method 2, then method 1. The
measurements can be canceled immediately after selection by
pressing [Exit].
2Navigate to <Menu>/<Settings>/<Miscellaneous>/<Method
save> and select "No".
 The favorites list contains the three methods just selected and
will remain in this state.
3.6. Further Settings
Detailed descriptions of all instrument settings can be found in chap-
ter Menu explanation, subsection 4 Settings, p. 56.
A
B
Favorites list
Method catalogue
83%
[Method 1]
[Method 2]
Main Menu
[Method 3]
Method Catalogue
Menu
A
B

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Initial Setup
12
3.7. Sensor Calibration
Before first use, calibrate your pH and redox sensors. See
Calibration of the pH Sensor, p. 40 and
Calibration of the Redox Sensor, p. 41.
Note: The rubber caps that the pH and redox sensors are
delivered with can be disposed of. Only use the specially
designed storage container for the storage of pH and redox
sensors.
3.8. Selecting Method for Turbidity Measurement
Select ISO 7027-1 or EPA 180.1 from <Menu>/<Settings>/
<Sensors>/<Turbidity>/<Method.>.
Depending on the method selected, the turbidity is automatically
displayed in FNU (ISO 7027) or NTU (EPA 180.1). If required, the
unit can be selected manually from <Menu>/<Settings>/<Units>/
<Turbidity>.

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Photometry
13
4. Photometry
4.1. Basic Rules for Photometry
The precision and repeatability of a photometric determination
depends greatly on the operator's technique. Please observe the
following rules:
Always use clean utensils
Residues from previous measurements can falsify the results. The
cuvette cap and all utensils such as syringes or cuvettes must be
rinsed with clean water after each measurement. Rinse the cuvette
additionally with the sample 2 to 3 times before each measurement.
Remove the cuvette from the adapter before emptying it. Otherwise,
it may fall out of the adapter.
Keep the outside of the cuvette clean and dry
Keep the cuvette free of fingerprints and dry the outside of the
cuvette before inserting it into the cuvette adapter.
If condensation occurs on the cuvette (cold sample in a warm
environment), wipe it off and carry out the measurement as quickly
as possible.
Observe proper sampling
Take the water samples about 10 cm below the water surface and
about 50 cm from the edge of the pool. Allow as little time as possi-
ble to elapse between taking the sample and making the measure-
ment.
Observe proper dosing and mixing
Use the 10 ml syringe for exact dosing of the sample. Rinse the sy-
ringe several times with the sample. When filling the syringe, make
sure that there are no air bubbles and that the volume is 10 ml.
The order in which sample and reagents are added to the cuvette
varies from method to method. If the reagents are added to the cu-
vette after the sample, special care must be taken to ensure that the
sample and the reagents mix well.
Observe reaction times
With most methods, the measurement can be carried out immediate-
ly after the reagents have been added and mixed with the sample. If
a reaction time is required, this is indicated on the screen.

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Photometry
14
4.2. How To Use Reagents
Whenever possible, Swan supplies reagents in liquid form, as used
in professional laboratories. We believe that the disadvantage of
shorter shelf life is more than compensated for by the ease of use
compared to tablets or powders.
The OXYCON-DPD reagent is delivered in two small bottles to in-
crease shelf life. One contains DPD as powder (DPD 1a), the other
contains the solvent (DPD 1b). Before use, fill the contents of DPD
1b into DPD 1a, close the bottle with the drop counter and shake
firmly until the DPD powder has completely dissolved. Write the mix-
ing date on the bottle. The prepared reagent can be stored at room
temperature for 2 months.
The reagents OXYCON START and OXYCON 2 have a shelf life of
at least 6 months. They will last a year if handled carefully and stored
at 5 °C. With the blister pack, all reagents can be taken out of the
case at once and placed in the refrigerator.
To dispense the necessary number of drops, hold the bottle at a 45°
angle. Before proceeding with the measurement, make sure that the
reagents are well mixed with the sample.
The Chematest 42 is calibrated against Swan's OXYCON reagents.
Accuracy may suffer severely if reagents from other sources are
used.

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Photometry
15
4.3. Overview of Methods and Reagents
4.3.1 Chlorine
4.3.2 Other Disinfectants
Method Reagent 1 Reagent 2 Reagent 3 Result(s) shown
Free chlorine Oxycon Start Oxycon DPD --- Free chlorine in ppm Cl2
Total chlorine Oxycon 2 Oxycon DPD --- Total chlorine in ppm Cl2
Combined chlorine
(1 cuvette)
Oxycon Start Oxycon DPD Oxycon 2 Free chlorine (fac), total
chlorine (tc) and
combined chlorine (cc) in
ppm Cl2
cc = tc - fac
Combined chlorine
(2 cuvettes)
Cuvette 1: Measurement of free chlorine Free chlorine (fac), total
chlorine (tc) and
combined chlorine (cc) in
ppm Cl2
cc = tc - fac
Oxycon Start Oxycon DPD ---
Cuvette 2: Measurement of total chlorine
Oxycon 2 Oxycon DPD ---
Free chlorine in
presence of
chlorine dioxide or
bromine
Measurement A Free chlorine in ppm Cl2
fac = A - B
Oxycon Start Oxycon DPD ---
Measurement B
Oxycon GL Oxycon Start Oxycon DPD
Method Reagent 1 Reagent 2 Reagent 3 Result(s) shown
Ozone Oxycon 2 Oxycon DPD --- ppb as O3
Ozone in presence
of chlorine
Measurement A ppb as O3
O3 = A - B
Oxycon 2 Oxycon DPD ---
Measurement B
Oxycon GL Oxycon 2 Oxycon DPD
Bromine Oxycon Start Oxycon DPD --- ppm as Br2
Iodine Oxycon Start Oxycon DPD --- ppm as I2
Chlorine dioxide Oxycon Start Oxycon DPD --- ppm as ClO2

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Photometry
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4.4. Notes on Individual Methods
Free chlorine
and cyanuric
acid
When free chlorine is determined in the presence of cyanuric acid,
two forms of chlorine are measured: free chlorine and chlorine bound
to cyanuric acid. To determine the disinfection capacity of the water,
the concentration of cyanuric acid must also be measured and the
result of the chlorine determination must be corrected as follows:
Combined
chlorine
The method catalogue of the Chematest 42 contains two options for
measuring combined chlorine:
with one cuvette or
with two cuvettes.
Apart from the fact that one or two cuvettes are used, the two meth-
ods are identical. Measuring with only one cuvette is faster and re-
quires less reagents. However, some standards require
measurement with two cuvettes. The selection of the method should
be based on the site-specific requirements.
Ozone Ozone decomposes in a very short time and is usually only present
in traces. It is essential to rinse the cuvette three times with the
ozone-containing sample before starting the measurement. Carry
out the further steps as quickly as possible, but work meticulously.
Cyanuric acid 20 mg/l 30 mg/l 50 mg/l 70 mg/l
Percentage of free
chlorine in the mea-
sured value
50% 43% 26% 19%

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Photometry
17
4.5. Performing a Photometric Measurement
WARNING
Multiple Hazards
For safe handling of the reagents, you must read and understand
the corresponding Material Safety Data Sheets (MSDS). These
can be downloaded from www.swan.ch.
General A photometric measurement with the Chematest 42 consists of the
following steps:
Step 1: Zero measurement
Step 2: Addition of reagents and subsequent measurement (for
some methods with further intermediate steps and/or reaction
times)
Step 3: Display and storage of the measured results. For de-
tails on the result screen, see example on 20.
All photometric measurements are completely menu-driven. Just se-
lect the corresponding method on the main screen or in the menu
catalogue and follow the instructions on the screen.

A-96.730.111 / 160124
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Photometry
18
Example:
Measurement
of free chlorine
Step 1: Zero measurement
Step 2: Addition of reagents and subsequent measurement
83%
Free chlorine
Fill 10 ml of sample into
a cuvette. Dry outer part
and place it in the adapter.
------------------------------------------
<Enter> to continue
83%
Free chlorine
Place the adapter in
the Chematest and
close the cap.
------------------------------------------
<Enter> for zero
83%
Free chlorine
Measuring zero...
------------------------------------------
Wait for instructions
83%
Free chlorine
Remove adapter
with cuvette and
open the cap.
------------------------------------------
<Enter> to continue
83%
Free chlorine
Add 5 drops of both:
Oxycon START and then
Oxycon DPD.
------------------------------------------
<Enter> to continue
83%
Free chlorine
Close the cap and
turn the adapter to mix.
Place in Chematest.
------------------------------------------
<Enter> to measure
83%
Free chlorine
Measuring...
------------------------------------------
Wait for instructions