Brief introduction
PGas-21 Series Single Gas Detector has high sensitivity and high accrancy, it is suitable for the detection of many kinds of toxic and harmful gases. The instrument adopts advanced 16-bit microcontroller with extra low power consumption and quick processing speed. It is firm and durable with the anti-skid design of shell. It is widely used in petroleum, petrochemistry, chemical industry, gas, coal, metallurgy and power system; safety detection in municipal administration, communication and traffic tunnel construction; electronics and semiconductor industry and other places where toxic and harmful gases exist.

Parameter	Characteristics
Measuring gas	Combustible gas, toxic and harmful gas, refer tolectotype table for details
Sampling Method	Diffusion, Pump sampling
Measurement principle of sensor	Electrochemical (oxygen and poisonous gas), catalyticcombustion (combustible gas)
Range	Refer to lectotype table for details
Alarm indication	90dB variable sound vibration alarm, overrange, alarmagainst insufficient quantity of electricity
Response time	(CO, H2S, SO2, CL2, NO, CLO2, NO2<60s),(HCN, NH3, O3, HCl,C2H4O <160s), (PH3<100s),(combustible gas <30s)
Detection error	±5%F.S
Operation mode	Touch push-key
Display mode	Five-bit eight-segment LCD digital display
TemperatureofOperation envioroment	-20℃~55℃
Humidity of Operation envioroment	0~95%RH (no dew condensation)
Storage temperature	0℃~40℃
Power supply	Rechargeable lithium battery, continuously work for over24 hours
Battery	4.2V lithium battery, 1700mA/h capacity
Dimension	100×60×30 mm
Weight	105g
Explosion-proof grade	ExiaⅡCT3
Protection grade	IP65
Calibration mode	Optional calibrating cap tofacilitate calibration by users

Model	Range	Low alarm setting range	High alarm setting range	Low alarm point	High alarm point
PGas-21-FL	0-100%LEL	10%LEL-5%LEL	25%LEL-80%LEL	20%LEL	50%LEL
PGas-21-CO	0-500ppm	25ppm-100ppm	100ppm-500ppm	35ppm	200ppm
PGas-21-CO	0-1000ppm	25ppm-100ppm	100ppm-500ppm	35ppm	200ppm
PGas-21-H2S	0-100ppm	5ppm-15ppm	15ppm-30ppm	10ppm	15ppm
PGas-21-SO2	0-100ppm	1ppm-3ppm	3ppm-10ppm	2ppm	5ppm
PGas-21-CL2	0-20ppm	3ppm-10ppm	5ppm-15ppm	5ppm	10ppm
PGas-21-NH3	0-100ppm	20ppm-30ppm	30ppm-70ppm	25ppm	50ppm
PGas-21-NO	0-250ppm	20ppm-50ppm	50ppm-100ppm	25ppm	50ppm
PGas-21-NO2	0-100ppm	1ppm-2ppm	2ppm-5ppm	1ppm	2ppm
PGas-21-HCN	0-30ppm	5ppm-10ppm	10ppm-15ppm	5ppm	10ppm
PGas-21-PH3	0-1ppm	0.3ppm-0.5ppm	0.5ppm-0.8ppm	0.3ppm	0.6ppm

Explosion-proof mark: ExiaIICT3, it applies to 0 zone, 1 zone and 2 zone, the place that contains IIA~IIC category and T1~T3 group of explosive gas mixture, and is qualified to get explosion-proof conformity certificate through inspection by CQST.