MWS 903
Multi-Channel Gas Warning System
Application
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.
Fields of Application
Monitoring of:
- 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
Features
- 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
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 |
Accessories
Signal horn (siren), Warning light, Warning banner, Test meters, Plotter, Stand-by power supply UPS 2000 24 V.
Additional accessories will be offered, according to the system required. An early warning of dangerous, explosive and non-combustible gases and vapours.