| Operating & Storage Environment | Temperature: -20°C~55°C (-4F~122F) Humidity: 5%-95% (Relative humidity non-condensing) Pressure: 95~110kPa | 
            
            
                | Sampling method | Diffusion type | 
            
            
                | Detecting Range | CO: 0~1000ppm
                 
                H2S:0~100 PPM 
 O2: 0~30%vol 
 Combustible Explosive Gas (Ex / LEL / CH4): 0~100%LEL | 
            
            
                | Sensor | O2 /H2S / CO: plug-in electrochemical sensor Combustible gas (LEL): plug-in catalytic combustion sensor | 
            
            
                | Alarm Type | low & high alarm, multiple gas alarm, sensor alarm, battery low alarm, prompt tone, automatic shutdown alarm | 
            
            
                | Resolution | 0.1%VOL (O2), 1ppm (CO), 0.1ppm (H2S), 1%LEL (EX) | 
            
            
                | Accuracy | 3% F.S | 
            
            
                | Response time | 10s | 
            
            
                | Repeatability | 1% | 
            
            
                | Zero drift | 1% | 
            
            
                | Display | Alphanumeric large LCD displays the real time gas concentration and alarm stage | 
            
            
                | Backlight | Automatically activated when working in poor lighting environment or the alarm sounding or the button is knobbed down. | 
            
            
                | Self-checking Function | Self-checking Battery power, display, sensor, hardware failure | 
            
            
                | Explosion-proof | EXiaIICT4 | 
            
            
                | Protection grade | IP65 | 
            
            
                | Power Supply | Rechargeable lithium battery | 
            
            
                | Dimensions | 130mm*67mm*30mm |