GW 399

Multi-Channel Gas Warning System
GW 399


The multi-channel gas warning system GW 399 continuously monitors the ambient air and provides an early warning of hazardous, explosive and non-combustible gases and vapours.

Fields of Application

  • Monitoring of heating systems
  • Garages and tunnels
  • Liquid gas rooms
  • Laboratories
  • Cold storage houses and air conditioning plants
  • Plastic processing plants
  • Chemical industries
  • Paint manufacturing plants
  • Concentration measurement of O2
  • and many more
  • Features

  • Use of various types of measurement sensor
  • Direct warning status recognition, via different colors of the LC-Display background illumination
  • Menu-aided operation, via 2 keys
  • Three alarm thresholds individually adjustable from 5-100% of test range
  • Three floating alarm outputs for driving additional warning and control systems
  • Floating relay contacts
  • Serial output, RS232 or RS485 LON® -interface
  • 4-20 mA current output
  • Different housings are available e. g. 19" rack, panel mounting, wall-mounted housing
  • Up to 10 units per rack
  • 1 control unit configurable as master, for supervision of central alarms and communication control systems
  • High degree of reliability
  • Low current consumption
  • Possibility of uninterruptible power supply
  • Examples of measurable gases

    Gas Formula
    Acetylen C2H2
    Ether C4H10O
    Alcohol e.g. C2H6O
    Ammonia NH3

    Butane C4H10
    Chloroform CHCl3
    Hydrogen chloride HCl
    Helium He
    Carbon dioxide CO2
    Carbon monoxide CO
    Methane (natural gas) CH4
    Neon Ne
    Propane C3H8
    Oxygen O2
    Carbon tetrachloride CCl4
    Toluene C7H8
    Hydrogen H2
    Xylene C8H10


    Signal horn, warning light, warning banner, ventilation control, test meters, plotter.

    Additional accessories are available, depending on the system ordered.

    Technical data

    Details as for control unit
    Sensors: Semiconductor sensor
    Heat reaction sensor
    Thermal conductivity sensor
    Chemical sensor
    Infrared sensor
    Sensors input: 1 two-wire sensor (e. g. TOX 592) or 1 three-wire sensor (e.g. GTR 196)
    Sensor supply: 20 V DC / 200 mA
    Ranges: Adaptable by software
    Accuracy: < 2%, f.s.d.
    Ambient temperature: +14 °F to +104 °F
    Temperature effects: < 2 % for a ±20 °C change
    Installation: Panel mounting or wall-mounting
    Output signals: Current output 4-20 mA
    RS 232 or RS 485 interface
    3 alarm relays
    1 fault relay
    Relay rating: 230 V, 450 VA
    other voltages on request
    Voltage supply: 115 V / 60 Hz
    Optional: 230 V / 50 Hz
    24 V DC
    Power consumption: 8 VA