YL-1D Desktop residual chlorine testerDetailed product description：

1、 Product Overview
The YL-1D desktop residual chlorine tester is suitable for detecting residual chlorine concentration in large, medium, and small water plants, industrial and mining enterprises, domestic or industrial water, in order to control the residual chlorine in water to meet the specified water quality standards.

2、 Principle:
This instrument adopts the DPD method and applies the principle of microcomputer photoelectron colorimetric detection to replace the traditional visual colorimetric method. Eliminating human error, the measurement resolution is greatly improved. When measuring, when the tested water sample is poured into the reagent, the water sample will turn red. Then place this water sample into a photoelectric colorimetric stand, and the instrument will compare the depth of red to determine the concentration of residual chlorine.

Technical parameters

measurement range	0-2.5mg/L
Minimum indication value	0.01mg/L
repetitiveness	≤2%
Precision	± 5% FS ± 1 word
charger	AC 220V 50Hz

3、 Characteristics:
1. Microcomputer and touch keyboard are easy to use.
2. It can automatically zero and calibrate from 1 to 5 points.
3. This instrument adopts a unique semiconductor emitter (patent application number 99226785.2), which has a light source lifespan several orders of magnitude longer than incandescent lamps (about 350 hours), about tens of thousands of hours.   
4. High resolution. The instrument resolution reaches 0.01mg/L.

4、 Operation Guide
Turn on the power switch, pour the water sample into the glass sample tank, use a strong absorbent soft cloth or paper to dry the water stains outside the glass sample tank, put in a piece of reagent, dissolve and shake well, then put it into the sample tank seat, cover the sample tank cover, wait for a few seconds for the displayed number to stabilize, and then read it.