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      | Detecting gas | combustible gas, toxic gas, oxygen | 
| Measuring Range | according to the gas detected | 
| Deviation | ≤± 3% F.S | 
| Respond Time | T90 < 30 s | 
| Working Temperature | toxic gas: – 20 °C ~ + 50 °C | 
| Combustible gas: – 40 °C ~ + 70 °C | |
| Working Humidity | < 95% R.H. no condensation | 
| Sensor | electrochemical sensor; catalytic combustion type sensor for KQ500-EX | 
| Sensor life | 2-5 year | 
| Working Voltage | 24V DC±15% | 
| Working Time | continuously as long as power input | 
| Protection Class | IP66 | 
| Weight | ≤900 g | 
| Fixed parameter | Fixing type: wall-mounted type | 
| Transition cable: two core shield cable | |
| (KQ500-EX uses three core shield cable), | |
| section 2×1.5mm2, external diameter 10mm | |
| Transmission distance ≤1000m | |
| Technical parameter | Working voltage: 16~30VDC | 
| Working current: KQ500-EX is 120mA, others ≤50 mA | |
| Output signal: 4~20mA standard signal two wire type output | |
| (KQ500-EX three wire type) | |
| Explosion-proof Level | Exd IICT6(used for explosion proofing detector); | 
| ExiaIICT4(used for intrinsic safety type detector) |