Extech EX900 Instruction Manual

User's Guide

ExStik® CL200A

Waterproof Total Residual Chlorine Tester

Patent Pending

2

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.

Meter Description

CL200 Front Panel Description

The ExStik’s

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)

®

keys have functions which change depending on the electrode

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

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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.

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