The multi-channel gas warning equipment ADOS
MWS 903 continuously monitors the surrounding air and provides an early warning of dangerous, explosive and non-combustible gases and vapours.
It is possible to connect up to 8 gas transmitters
(2- or 3-wire) to the unit.
6-section keybord and illuminated 4-line LC-Display for indicating actual values, half-hourly average values and fault messages, all clear text encoded
Ready, fault and gas warning display
Menu-assisted settings for the equipment parameters, via 6-section keyboard
Two alarm thresholds for each sensor, independently adjustable from 5 % to 100 % of the measurement range; facility for forming half-hourly average value
A maximum of 12 floating alarm outputs for controlling extra warning and control devices
Floating change-over contacts for fault, siren and warning banners
Serial interface output, RS 232 for connecting a printer or PC
Plastic, wall-mounted housing (IP 54)
4–20 mA interface
Plastic, wall-mounted housing
High operational reliability
Low current consumption
Easy installation
USP unit available
Heating systems
Garages and tunnels
Liquid gas storage rooms
Laboratories
Cold storage houses
Plastic processing plants
Chemical industries
Paint manufacturing plants
Concentration measurement of O2
and many more
Examples of measurable gases
| Gas | Formula |
| Acetylene | C2H2 |
| Ether | C4H10O |
| Alcohol | e.g.C2H6O |
| Ammonia | NH3 |
| Petrol | |
| 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 |
Technical Data
| Sensor inputs: | 8 two-or-three-wire sensors (e.g. LCTR 903) with current interface, 4–20 mA |
| Sensor supply: | 24 V= / 200 mA |
| Ranges: | CO 0-300 ppm NO2 0-30 ppm CH4 0-100 % UEG CO2 0-10 Vol % other ranges on request |
| Ambient temperature: | -10 °C to +40 °C |
| Digital inputs: | 1 input for siren cancel |
| Digital outputs: | max. 12 alarms 1 fault relay 1 siren relay Warning banner relay All outputs have floating change-over contacts, max. rating 250 V / 4 A |
| Standard output signals: | Analog output 4–20 mA serial interface RS 232 |
| Mains connection: | 230 V / 50 Hz 115 V / 60 Hz (optional) 24 V / DC (optional) |
| Dimensions (WxHxD): | 240 x 160 x 90 mm |
| Weight: | approx. 2 kg |
| Protection type: | IP 54 according to DIN 40050 |
