... type gas detecting system 2:For toxic&combustible gas detectors,temperature&pressure signal 3:4-20mA,Expandable channe Gas monitor ... , GAS DETECTING SYSTEM ,GAS DETECTOR ,for toxic and combustible gas,Temperature&Pressure signalFeature:1.Standard 4U tray-type ... high alarm for any address range or any type of detectors4. Detectors sensitivity and zero calibration ... ,XP3000/L 4U tray type gas monitor