The instrument uses the DPD method, which uses optoelectronic colorimetric detection instead of traditional visual colorimetry. Human error is eliminated, so the measurement resolution is greatly improved. During the measurement, the water sample turns red when the test sample is placed in the DPD tablet. Then place the water sample in the photoelectric color bench, and the meter will obtain the concentration of residual chlorine by comparing the depth of red.
The residual chlorine/total chlorine analyzer is applicable to the concentration of residual chlorine, total chlorine, and combined residual chlorine in domestic or industrial water in large, medium and small water plants, industrial and mining enterprises, swimming pools, etc., in order to control the residual chlorine/total chlorine in water. Meet the required water quality standards.

Model	SYL-1	SYL-1B
Measuring range	0～5 mg/L（0～10mg/L）
Minimum readout	0.01mg/L
Basic error F.S	±5％FS
Repeatability	3%
Power supply	AC 220V  ±10% 50Hz	AC220V/50Hz/ DC7.5V/0.2A
Characteristics	Desktop	Portable