Hydrogen sulfide gas alarms

Hydrogen sulfide gas alarms SK-6000X-H2S
Detect Theory: Electrochemical
detect gas : Hydrogen sulfide(H2S)
Display Mode: LED\LCD
Measurement Range: 0-50/100/200/500/1000/2000/10000(ppm)
Accuracy: <=±3%FS
Response Time;<=60 Seconds
Setting Mode: Infrared control
Output Signal: 4-20mA(3 wires)RS485(4 wires)
Alarm Mode: light alarm. 
Relay output: 1A 24VDC
Transmission Distance: Max.1500m (2.5mm2 copper cable)
Power Supply: +-24VDC
Install Mode: 2"Pipe Mounting
Explosion Prevention Screw Thread: G3/4"pipe thread
Explosion Prevention Mark: Exd IIC T6
Shell level of Protection:>=IP65
Working Temperature: -40-+70
Relative Humidity: 15~95%RH
Maximum Power supply Consumption: 1-2.5w
Dimension: 190*180*100(mm)
Weight:  3kg

Sensors measure: combustible gas(100%LEL) ; toxic gas(PPM)
(Schedule Gas Detection)
Sensors measure: toxic gas(PPM)
Hydrogen sulfide(H2S),Carbon monoxide(CO),Carbon dioxide (CO2),Ammonia (NH3),Chlorine (CL2),Hydrogen Cyanide (HCN),Oxygen (O2),Nitric oxide (NO),Nitrogen(NO2),
Sulphur dioxide (SO2),Chlorine Dioxide (CLO2),Iodomethane(CH3I),Vinyl chloride(C2H3CL) 
Acetic acid (acetic acid / acetic acid) CH3COOH(HAc),Hydrogen chloride (HCL),
Carbonyl chloride (phosgene) (COCL2),Hydrogen fluoride (HF),Phosphine (PH3),
Acid (HCOOH),Iodine (I2),Methanol (CH3OH),Ethanol (C2H5OH),Formaldehyde (CH2O),
Acetaldehyde (CH3CHO),Oxirane (C2H4O),Hydrogen bromide (HBr),Ozone (O3),
Silane (SIH4),Arsine (AsH3),Diborane (B2H6)
combustible gas(100%LEL)
Liquid natural gas LNG(Methane CH4),Hydrogen (H2),Gasoline (ULP),Toluene (C7H8),
Xylene (C8H10),Acetylene (C2H2),Ethane (C2H6),Liquid natural gas  LPG(Propane C3H8),
Butane (C4H10),Pentane (C5H12),Propylene (C3H6),Butene (C4H8),Butadiene (C4H6),
Acetone (C3H6O),Butanone (C4H8O),Ether (C4H10O)