QB2000N intelligent oxygen detect transmitter transforms the gas density in the operating site into standard electric current signal. It is totally international standard intelligent poisonous gas transmitter, of which the sensor can be changed and reused as soon as it is connected to electricity. QB2000N has excellent performance, reliable running, easy maintenance, and it can detect various gas, it can satisfy various requirements for the running stability and variety of the detect gas of the meters in the operation site; it has been widely used in petrol, chemistry, metallurgy, artifice, gas transportation, biological medicine and water procession etc. Characteristics: ◆ Standard two-wires 4-20mA electric current output, compatible with existing alarm control unit or DSC (distributed control system). ◆ LED site display that is suitable to be used in factory (optional) ◆ Automatic identification and display of the sensor failures, and output the corresponded current signal at the same time. ◆ 30~+60℃ temperature number’s automatic tracing assures the detecting veracity. ◆ Standard three buttons realize an individual to main a single point in site. ◆ Site poles light alarm, relay output (connected with audible and visual alarm outside or start the exhaust system) Technical Parameters: ◆Detect scope:0-25%vol ◆ Working voltage:24VDC±15% ◆Signal output:4~20mA linear current output; or RS485signal output ◆Respond time:T90 less than 30 seconds ◆Recovering time: less than 30 seconds ◆Distinguishability :see the chart ◆Accuracy: ±3%F.S ◆Display model: LED digital tube display (liquid crystal is optional) ◆Environment temperature: -30~+60℃(depends on sensor’s parameter) ◆Environment humidity: 10-95% R.H.(without condensation) ◆Anti-explosion class: Exd IICT6(used for explosion proofing); ExiaIICT4( used for intrinsic safety type) ◆ Protection class: IP66 ◆Size &weight: 160mm(L)140mm(W)85mm(H) about 1.5kg