Extech Instruments ExStik CL200 User manual

User's Guide
ExStik®CL200
Waterproof Total Residual Chlorine Tester
Patent Pending

CL200 V6.0 06/052
Introduction
Congratulations on your purchase of the ExStik®CL200 chlorine tester.
The CL200 is a revolutionary first of its kind measurement device that
offers direct reading of Total Chlorine from 0.01 to 10.00 ppm. The
electrode method employed by the ExStik®is approved by the U.S.
Environmental Protection Agency (EPA) as an acceptable method for
wastewater compliance monitoring of total chlorine. For this type of
electrode method, a reagent tablet must be added to the measurement
solution before testing. The advantages of the CL200 to the user
include: Easy to use and maintain, high accuracy, self-calibration, and
fast response. The CL200 offers simultaneous Chlorine and
Temperature displays and a 15-reading memory storage. Careful use
and maintenance will provide years of reliable service.
Applications
The CL200 can be used wherever a measurement of the total chlorine
in water is needed. This is also referred to as total residual chlorine. It
measures the total of all chlorine present in all forms, including
dissolved free chlorine, chloramines, hyporchlorous acid and
hypochlorite ion. Typical applications include measurements of
discharge water from water treatment plants, public drinking water
supplies and cooling towers, and measurement of disinfectant
properties in swimming pools and cooling water applications.

CL200 V6.0 06/053
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Meter Description
CL200 Front Panel Description
The ExStik’s®keys have functions which
change depending on the electrode
attached (pH, ORP or Chlorine). Key
descriptions here apply for the ExStik®with
a chlorine electrode attached.
1. Battery compartment
2. LCD Display
3. MODE/HOLD button (store data)
4. CAL/RECALL button (change temperature units
and recall data. Calibration not required
for chlorine)
5. ON/OFF button
6. Electrode Collar
7. Electrode
(Note: The Electrode cap is not shown)
ExStik®CL200 Display
1. Bargraph display
2. Measurement display
3. BAT (low battery) and
HOLD (data hold) indicators
4. Temperature display
5. Bargraph scale designations
6. Unit of measure
Accessories
•CL203 – ExTab®Reagent tablets (10-pack for 100 tests)
•CL205 – Spare chlorine electrode
•EX006 – Weighted base with 5 solution cups
•PH100 – pH Electrode
•RE300 – ORP Electrode
•EX007 – Solution cups (24 pack)

CL200 V6.0 06/054
Getting Started
Equipment Required
A chlorine test requires a 20ml sample cup, a reagent tablet and the
CL200 with a chlorine electrode attached. The optional EX006 Weighted
base is a recommended accessory.
Battery Activation
An insulating tab is located in the battery compartment and prevents
battery drain during storage. It must be removed before use. Refer to the
battery replacement paragraph in the maintenance section.
Measurement Procedure
Sample Preparation:
1. Place the test sample into the sample
cup up to the 20mL line.
2. Drop one reagent tablet into the
sample, wait 10 seconds and then
shake or stir vigorously until it is
dissolved.
Measurement:
1. Press the ON button and insert the electrode into
the sample.
2. Stir the sample with the electrode for 5 to 10
seconds. The “HOLD” indicator will appear after
120 seconds.
Reading:
The value in the display is the total chlorine in ppm.
Note: After running a test, wipe the entire electrode
with a clean/dry paper towel.

CL200 V6.0 06/055
Storing Readings
1. Press the MODE button to store a reading. The storage location
number will be displayed followed by the stored reading and the
“HOLD” indicator.
2. Only one reading can be stored during the 120 second measurement
cycle.
3. Press the MODE button again to return to normal operation.
4. If more than 15 readings are stored, previously stored readings
(starting with number 1) will be overwritten.
Recalling Stored Readings
1. Press the CAL button and then press the MODE button immediately
after CAL is displayed; a location number (1 through 15) will flash.
2. The last stored reading taken will be displayed first. To scroll through
the stored readings, press the MODE button. The location number is
displayed first, followed by the reading stored in that location.
3. To exit the storage mode, press the CAL button and the CL200 will
return to normal operation.
Note: If the batteries are removed all stored readings will be lost.
Changing the Temperature Units
Press and hold the CAL button for approx. 3 seconds to change the
temperature units.
Auto-Power OFF
The auto power off feature automatically shuts the CL200 off 10 minutes
after the last keypress.
Low Battery Indication
When the batteries become weak the “BAT” icon will appear in the
display. Refer to the Maintenance section for battery replacement
information.

CL200 V6.0 06/056
Considerations and Techniques
1. If the meter has not been used for several weeks or is new, at least
two tests should be made to condition the electrode.
2. Do not touch the reagent tablets. Touching can cause
contamination.
3. If the electrode has not been used for in a 24hr period, wipe the tip
with a clean/dry paper towel before use.
4. Before use, wash the sample cups and the caps and then rinse them
completely.
5. The CL200 should not be left in a solution while turned off. If left in
solution while turned off, subsequent readings may take longer to
reach the correct value.
6. Do not touch the sensor surface except with a clean/dry paper towel.
7. When measuring solutions that have large differences in chlorine
concentration, i.e. 0.1ppm and 5.0ppm, use separate sample cups.
8. Discard the sample cup when it shows a color change.
9. Maintain the electrode by completely wiping dry and then replacing
the electrode cover immediately after taking a measurement. The
electrode should always be stored in the dry cap.
10. Cover the connector with the clear cover whenever the electrode is
removed from the meter body.
11. Gently stirring the probe in the solution for 10 seconds, within the
first minute of operation, will accelerate the process and yield more
accurate readings. Do not stir after 10 seconds.
Troubleshooting Guide
1. If the unit appears locked it is possible that the Data Hold mode has
been inadvertently accessed. If the HOLD icon is displayed, simply
press the MODE button or turn the meter off and restart.
2. If the meter latches up and cannot be reactivated by a button press,
remove the batteries and restart. Note that if the batteries are
removed, any stored readings will be lost.
Electrodes Types
The CL200 can also measure ORP and pH. To perform these tests,
the appropriate electrode must be acquired and connected to the
ExStik®. When the unit is turned on, it recognizes the type of electrode
that is connected and displays the appropriate unit of measure.

CL200 V6.0 06/057
Maintenance
Battery Replacement
1. Twist off the battery compartment cap
2. Replace the four (4) CR2032 batteries observing polarity.
3. Replace the battery compartment cap
Cleaning and Maintaining the Electrode
The CL200 Chlorine Electrode arrives in a factory-cleaned condition and
is ready to be used. The electrode will perform best and yield more
stable readings after the first few tests. Before and after tests, firmly
wipe the electrode tip with a clean, dry paper towel to remove any
compounds that may have formed. When not in use, the CL200 should
be stored with the electrode cap in place.
Electrode Replacement
The CL200 is shipped with an electrode attached. If the electrode has to
be replaced, or if a pH or ORP electrode is to be installed, follow these
steps:
1. Turn the unit off.
2. To remove an electrode, unscrew and remove the electrode collar
(turn the collar counter-clockwise).
3. Gently rock the electrode from side to side, pulling it downwards, until
it disconnects from the meter.
4. To attach an electrode, allign the slots and carefully plug the
electrode into the meter socket.
5. Tighten the electrode collar firmly enough to make a good seal (a
rubber gasket seals the electrode with the meter).

CL200 V6.0 06/058
Specifications
Display Multifunction LCD with Bargraph
Operating conditions 32 to 122oF (0 to 50oC) and < 80% RH
Chlorine range 0.01 to 10.00 ppm (Total Chlorine)
Chlorine accuracy 0.05 to 5.00ppm; ± (10%reading + 0.01ppm)
5.00 to 10.00ppm; ± (15%reading + 0.05ppm)
Temperature 23 to 194oF (-5 to 90oC)
measurement range
Temperature range 32 to 122oF (0 to 50oC)
for Chlorine
measurement
Temp. Resolution 0.1oup to 99.9 then 1o
Temp. Accuracy ± 1.8oF (1oC) from 23 to 122oF (-5 to 50oC);
± 5.4oF (3oC) from 122 to 194oF (50 to 90oC)
Measurement storage 15 readings can be stored and recalled
Low battery indication ‘BAT’ appears on the LCD
Power Four CR2032 button batteries
Auto power off Automatically turns off after 10 minutes after the
last key press

Support line [phone]
Technical support: Extension 200; E-mail: [e-mail]
Repair & Returns: Extension 210; E-mail: [e-mail]
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects
in parts and workmanship for one year from date of shipment (a six month limited warranty
applies to sensors and cables). If it should become necessary to return the instrument for
service during or beyond the warranty period, contact the Customer Service Department at
[phone] ext. 210 for authorization or visit our website www.extech.com for contact
information. A Return Authorization (RA) number must be issued before any product is
returned to Extech. The sender is responsible for shipping charges, freight, insurance and
proper packaging to prevent damage in transit. This warranty does not apply to defects
resulting from action of the user such as misuse, improper wiring, operation outside of
specification, improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness for a specific
purpose and will not be liable for any direct, indirect, incidental or consequential damages.
Extech's total liability is limited to repair or replacement of the product. The warranty set
forth above is inclusive and no other warranty, whether written or oral, is expressed or
implied.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also
provides NIST certification for most products. Call the Customer Service Department for
information on calibration services available for this product. Extech recommends that
annual calibrations be performed to verify meter performance and accuracy.
Copyright ©2005 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
more info for Extech CL200
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Email: [e-mail]
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