1.Product Introduction

1.1 Test Principle
Free Chlorine in the sample as hypochlorous acid or hypochlorite ion immediately reacts with DPD (N,N-diethyl -p-phenylenediamine) indicator to form a pink color, which is proportional to the free chlorine concentration. 
Combined chlorine oxidizes iodide in the reagent to iodine. The iodine and free chlorine in the sample react with the DPD indicator to form a pink color, which is proportional to the total chlorine concentration.

1.2 Applied Range
The colorimeter can be used to measure the concentration of free chlorine or total chlorine in all kinds of water disinfected by chlorination. The LCD display the concentration of chlorine directly, the unit is mg/L.

1.3 Instrument Specification
Test Range： 0～3.00 mg/L
Light source： Light Emitting Diode（LED）
Wavelength :  525nm
Reading accuracy： 0.01mg/L
Detection precision： ≤ ±5%
Power Source： 4×1.5V
Battery Life： ≥ 40 working hours
Size： 159×68×35mm
Weight： About 220g（including batteries）
Working Environment：0~40℃；Relative  Humidity within 0~90% (No Condensed Water)

 2. Calibration

In order to save time and cost of constructing a calibration curve for users, the Huankai pocket colorimeter has been calibrated before it leaves the factory. 
 
3.Attentions

3.1. To insure the accuracy of test results, please use the same test tube when zero adjustment and sample analysis.
3.2. Let the test tube stand for 30s before read the test result.（to wait for the disappearance of air bubble and the sedimentation of solid granule）.
3.3. In order to prolong the working life of batteries, please turn the pocket colorimeter off.
3.4. If there is solid or liquid in cell holder, wipe it and then put test tube into the cell holder.
3.5. If the battery icon begins to twinkle, change the batteries first and then continue test.
3.6. Clean test tube and cap after test. If the test tube is contaminated, add detergent into the tube and then shake for 15s. The detergent is gotten by mixing the HCl (1+3) and ethanol at the ratio of 1:1. Please do not wash test tube with a brush!
To keep clean, the test tube can be soaked in deionized water when it is not used.

4.Packing List 

1. A test mainframe；
2. Free chlorine reagent （100 tests）
3. Total chlorine reagent （100 tests）；
4. 2 test tubes of 10 mL；
5. 4 batteries of 1.5V；
6. A instruction book；
7. A certificate of qualification；
8. Some lens paper；
9. A carrying case

5.Product Vadility Check
5.1 Visual Check
    The free/total chlorine reagent should be white or light gray powder. It means the reagent qualities had deteriorated if agglomerate or turn to brown.

5.2 Instrument Check
After zero with pure water, add a pack of free/total chlorine reagent; shake to dissolve and then test result according to Test Method (2.3). Generally speaking, the test result should be 0.00; It indicates the reagent quality has deteriorated severely if the test result is over 0.03; If the test result is not 0.00 but no more than 0.02, it shows that the reagent quality deteriorated slightly and users can continue use the reagent in rough test (or deduct reagent blank value in accurate test).
 
The deterioration of reagent quality will bring positive error to test result. 

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