Linear heat detector LWM-1, DE/EN


The LWM-1 enables early detection of fires or overheating. It is specifically designed for application in narrow rooms or rough environmental conditions. The system consists of an LWM-1 evaluation unit and a special sensor cable, which must be selected according to the type of application. The actuation on the loop and the resetting function is carried out via the esserbus transponder Part No. 808623.
Actuation on a conventional line is carried out via the same transponder. The device requires a separate voltage supply of 24V DC for the galvanic separation of D.C. voltage potentials and the voltage converter Part No. 781337 must be used in order to av
oid ground faults.
  • Maximum sensor cable length of 300 m
  • Resistant against mechanical and chemical impact, corrosion, humidity and dust
  • Calibration switch setting
  • Suitable for application in hazardous areas
  • Early fire detection with heat detector classes A1, A2, B and C
  • High chemical and / or mechanical resistance by using special sensor cables
  • 3 floating relay contacts for fire and fault signalling
  • Separate reset input for resetting via esserbus transponder 808623 during loop operation

Additional Information:
For application in Ex areas please read the instructions in the manual.
DisplayLED green: in operation, permanent light; LED red: alarm diff., permanent light, locked; LED red: alarm max., permanent light, locked; LED yellow: fault, flashing light, locked
Operating voltage10 ... 30 V DC
Starting current @ 24 V DC< 100 mA
Colorgray similar to RAL 7035
Weight gapprox. 550 g
MaterialABS plastic
Rangemax. 300 m, dependent on ambient temperature
Air humidity< 95 % (non-condensing)
Quiescent current @ 24 V DCapprox. 25 mA
Type of protectionIP65
Maximum sensor lengthmax. 300 m
Current consumption @ 24 V DCapprox. 25 mA (DIFF- or MAX-alarm)
Current consumption in the case of failuremax. 15 mA
Temperature range-20 °C ... 50 °C
VdS classF
VdS-NrG 205066
DimensionsW: 200 mm H: 120 mm D: 80 mm