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ADOS GmbH
Instrumentation and Control

Trierer Strasse 23-25
52078 Aachen, FRG

Phone: +49 (0)241 / 9769 - 0
Fax: +49 (0)241 / 9769 - 16
E-mail: info@ados.de
MWS 906 | Multi-Channel Gas Warning System

Application  

The multi-channel gas warning unit MWS 906
continuously monitors the ambient air and issues an
early warning of gases and vapours that are dangerous
to health, or when there is a danger of explosion, for
non-combustible gases and vapours.
Fields of Application  

Monitoring of:
  • Heating systems
  • Garages and tunnels
  • Liquid gas storage plants
  • Laboratories
  • Cold-storage depots
  • Plastic processing workshops
  • Chemical industries
  • Paint varnish manufacturers
  • Concentration measurement of O2
  • and many more
Features  

  • 6-section keyboard and backlit 4-line LC-display for displaying actual values, half-hourly average values and fault messages in cleartext
  • Ready for operation, fault and gas warning indicators
  • Menu-assisted adjustment of equipment parameters via 6-section keyboard
  • Three alarm thresholds for each sensor, indepen-
    dently adjustable from 5-100% of the measurement range, also possible to from half-hourly average values
  • A maximum of 48 floating outputs for driving additional warning and control devices
  • Floating change-over contact for faults, sirens and warning banners
  • Serial output RS 232, for connecting a printer or PC
  • 4-20 mA current interface as output signal
  • Plastic, wall-mounting housing (IP 54)
  • High degree of service reliability
  • Low power consumption
  • Easy installation
  • Un-interruptible power supply (UPS) can be used
Accessories  

Signal horn, warning lights, warning banner, plotter,
stand-by power supply unit UPS 2000 24 V.
Further accessories will be available, according to the
proposed measurement tasks.
Product data sheet  

Examples of measurable gases  

Gas Formula
Acetylene C2H2
Ether C4H10O
Alcohol e.g. C2H6O
Ammonia NH3
Petrol
Butane C4H10
Hydrogen chloride HCl
Helium He
Carbon dioxide CO2
Carbon monoxide CO
Methane (natural gas) CH4
Neon Ne
Propane C3H8
Oxygen O2
Toluene C7H8
Hydrogen H2
Xylene C8H10
Technical Data  

Sensor inputs: 16 two- or three-line sensors
(e.g. ADOS GTR 196)
with current interface
4 – 20mA
Sensor supply: 24 V= / 100 mA
Measurement ranges: CH4 0 – 100 % LEL
LPG 0 – 100 % LEL
H2    0 – 100 % LEL
NH3 0 – 1000 ppm
CO2 0 – 4 Vol %
CO   0 – 300 ppm
NO2 0 – 30 ppm
O2    0 – 25 Vol %
further ranges on request
Digital inputs: 1 input for cancelling the horn
(siren)
Digital outputs: max. 48 relays for alarms
1 fault relay
1 horn relay
1 warning banner relay
All outputs are floating
change-over contacts
rated at max. 250 V/4 A
Standard output signals: Analog output 4 – 20 mA
Serial interface RS 232
Voltage supply: 230 V / 50 Hz
115 V / 60 Hz (optional)
24 V / DC (optional)
Power consumption: max. 60 VA
Ambient temperature: -10 °C to +45 °C
Dimensions (WxHxD): 390 x 270 x 160 mm
Weight: approx. 5 kg
Protection type: IP 54 to DIN 40050