Meter Description - Extech Instruments CL500 User Manual

Introduction
Congratulations on your purchase of the CL500 chlorine tester. The CL500 is a revolutionary first
of its kind measurement device that measures free and total Chlorine from 0.00 to 3.50 ppm.
The electrode method employed 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 CL500 for the user include: easy to use and maintain, high
accuracy, self‐calibration, and fast response. This meter is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service. Please visit our website
(www.extech.com) to check for the latest version of this User Guide, Product Updates, and
Customer Support.
Applications
The CL500 can be used wherever a measurement of the total chlorine in water as 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, hypochlorous acid, and hypochlorite ion.
Typical applications include Total Chlorine measurements of discharge water from water
treatment plants, public drinking water supplies and cooling towers, and free chlorine
measurements of the disinfectant properties in swimming pools and cooling water
applications.
Meter Description
CL500 Front Panel Description
1. Test Bottle Chamber
2. Test Bottle Chamber latch
3. LCD display
4. POWER button
5. HOLD button
6. REC‐MAX‐MIN button
7. ZERO button
8. TEST‐CAL button
9. Test bottle
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