... leak detector with lcd display and alarm Technical features:1) 4-20mA, 3 wire connection ,compatible with existing alarm control ... reading ,units, bar graph , system status etc.4) International standard plug-in sensor, Plug and Play! .5) Sensor replacement without recalibration, ... 24VDC (10.5 ~ 45 VDC)2) Linear output signal: 4~22.8mA with superimposed communication signal for HART protocol3) Failure ...