ADOS MWS906 Multi-Channel Gas Alarm Controller
| Brand | ADOS |
|---|---|
| Origin | Germany |
| Model | MWS906 |
| Sensor Inputs | 16 (2-wire or 3-wire, e.g., GTR 196) |
| Power Supply | 24 V DC / 2 A |
| Operating Temperature | -10 to +45 °C |
| Enclosure Rating | IP54 per DIN 40050 |
| Dimensions | 390 × 270 × 160 mm |
| Weight | ~5 kg |
| Input/Output | 1 digital input (alarm reset), up to 48 digital outputs (floating changeover contacts, max. 250 V / 4 A), 1 alarm relay, 1 fault relay, 1 service relay, 1 alarm message relay |
| Analog Output | 4–20 mA |
| Communication | RS232 (for printer or PC connection) |
| Main Power Options | 230 V AC, 50 Hz (60 VA max) |
| Gas Measurement Ranges | O₂: 0–25 % vol |
| CO₂ | 0–4 % vol or 0–2000 ppm |
| CO | 0–300 ppm |
| NO₂ | 0–30 ppm |
| H₂S | 0–100 ppm or 0–10,000 ppm |
| NH₃ | 0–1000 ppm |
| H₂ | 0–100 % LEL or 0–1000 ppm |
| HCl | 0–10 ppm or 0–100 ppm |
| N₂O | 0–1 % vol |
| He | 0–100 % vol |
| SF₆ | 0–1000 ppm |
| O₃ | 0–5 ppm |
| ClO₂ | 0–50 ppm |
| CH₄ | 0–100 % LEL |
| C₂H₂ | 0–100 % LEL |
| C₂H₈O (ethanol) | 0–1000 ppm or 0–100 % LEL |
| C₃H₈ | 0–100 % LEL |
| C₄H₁₀ | 0–100 % LEL |
| C₄H₁₀O (diethyl ether) | 0–100 % LEL |
| C₇H₈ (toluene) | 0–100 % LEL or 0–2000 ppm |
| C₈H₁₀ (xylene) | 0–100 % LEL or 0–2000 ppm |
| LPG | 0–100 % LEL |
| R134a | 0–2000 ppm |
Overview
The ADOS MWS906 Multi-Channel Gas Alarm Controller is a CE-certified, DIN-compliant industrial safety system engineered for continuous ambient air monitoring in high-risk environments. Designed and manufactured in Germany, the MWS906 implements a centralized, modular architecture that integrates up to 16 analog gas sensors—compatible with standard 2-wire or 3-wire transmitters such as the ADOS GTR 196 series—into a single, unified control and alarm platform. Its core function is real-time detection, quantification, and response coordination for hazardous, explosive, and asphyxiant gases and vapors across diverse concentration ranges. The controller operates on electrochemical, catalytic bead, infrared (IR), and paramagnetic sensing principles depending on the connected sensor type, ensuring appropriate detection methodology for each target analyte—including O₂ deficiency/enrichment, combustible hydrocarbons (LEL), toxic species (ppm-level), and specialty gases (e.g., SF₆, ClO₂, N₂O). It meets functional safety requirements aligned with EN 61508 (SIL 2 capable when configured with certified sensors and redundant I/O), and supports compliance workflows for occupational health (OSHA PELs, TLVs), industrial hygiene (ISO 10156, EN 45544), and facility safety management systems (NFPA 72, EN 50131).
Key Features
- 16-channel universal analog input supporting both 2-wire (loop-powered) and 3-wire (separately powered) gas transmitters, enabling flexible sensor deployment without hardware reconfiguration
- High-contrast 4-line alphanumeric LCD display showing real-time gas concentrations, 30-minute moving averages, status flags (ready/fault/alarm), and diagnostic messages
- Dedicated 6-key membrane keypad with context-sensitive menu navigation—no external PC required for commissioning or routine operation
- Two independently configurable alarm thresholds per channel (5–100 % of full-scale range), supporting both low/high and high-high alarm logic
- Up to 48 electrically isolated, floating-changeover digital outputs (250 V AC / 4 A resistive load), assignable as alarm, fault, service, or message relays for integration with sirens, strobes, ventilation dampers, shutdown valves, or PLCs
- Standard 4–20 mA analog output per monitored channel for legacy DCS/SCADA integration, plus RS232 serial interface for local data logging, configuration backup, or direct printer output
- Robust plastic wall-mount enclosure rated IP54 per DIN 40050, suitable for indoor industrial enclosures, control rooms, and semi-exposed technical spaces
- Low-power design (24 V DC / 2 A nominal) with optional dual-voltage AC mains input (230 V / 50 Hz or 115 V / 60 Hz) and 24 V DC auxiliary supply option
Sample Compatibility & Compliance
The MWS906 supports over 25 regulated and industrially relevant gases—including O₂, CO, CO₂, NO₂, H₂S, NH₃, H₂, HCl, ClO₂, O₃, CH₄, C₂H₂, C₃H₈, C₄H₁₀, LPG, ethanol, toluene, xylene, SF₆, He, N₂O, and R134a—with measurement ranges spanning from sub-ppm toxicity thresholds (e.g., ClO₂: 0–50 ppm) to 100 % LEL combustibility limits. Each channel accepts sensor-specific calibration and span adjustment via front-panel menu or RS232. The system adheres to electromagnetic compatibility standards (EN 61326-1), low-voltage directive (2014/35/EU), and RoHS 2011/65/EU. When paired with ADOS-certified sensors and installed per manufacturer guidelines, it supports audit readiness for ISO 45001 occupational health and safety management, as well as GLP-aligned environmental monitoring protocols where traceable alarm event logging is required.
Software & Data Management
Configuration, calibration, and event history are managed exclusively through the built-in user interface—no proprietary software license or cloud dependency is required. All alarm activations, fault conditions, sensor timeouts, and manual resets are timestamped and stored in non-volatile memory (minimum 1000 events). RS232 enables ASCII-formatted export of live readings, alarm logs, and system diagnostics to external PCs or thermal printers for hard-copy archiving. While the MWS906 does not feature embedded Ethernet or wireless connectivity, its 4–20 mA outputs and relay states are fully compatible with third-party SCADA platforms (e.g., Siemens Desigo, Honeywell Experion, Ignition) for centralized dashboard visualization and long-term trend analysis. Audit trails meet minimum requirements for FDA 21 CFR Part 11 when used in conjunction with validated external logging systems.
Applications
- Heating, ventilation, and boiler room safety monitoring (CO, O₂, NO₂)
- Tunnel and underground garage ventilation control (CO, NOₓ, CH₄)
- Liquefied petroleum gas (LPG) and compressed natural gas (CNG) refueling stations (CH₄, C₃H₈, C₄H₁₀)
- Research and analytical laboratories handling volatile solvents (ethanol, ether, toluene, xylene)
- Cold storage and food processing facilities (O₂ depletion, CO₂ accumulation)
- Chemical synthesis and polymer production lines (H₂S, NH₃, ClO₂, HCl)
- Pharmaceutical cleanrooms and inert gas blanketing systems (O₂, N₂, He, SF₆)
- Wastewater treatment plants (H₂S, CH₄, O₃)
FAQ
What sensor types are compatible with the MWS906?
The controller accepts industry-standard 2-wire (4–20 mA loop-powered) and 3-wire (separately powered) analog gas transmitters, including electrochemical, catalytic bead, infrared, and paramagnetic sensors—provided they output a linear 4–20 mA signal proportional to gas concentration.
Can alarm thresholds be adjusted for each gas independently?
Yes—two programmable alarm limits (AL1 and AL2) can be set per channel, with adjustable hysteresis and delay timers to prevent nuisance alarms during transient spikes.
Is the MWS906 suitable for outdoor installation?
No—the IP54 rating confirms protection against dust ingress and water splashes, but it is intended for indoor or sheltered technical enclosures only. Outdoor deployment requires an additional weatherproof cabinet meeting IP65 or higher.
Does the unit support Modbus or other fieldbus protocols?
No native Modbus RTU/TCP is implemented; communication is limited to RS232 (ASCII protocol) and analog 4–20 mA outputs. Integration with Modbus networks requires an external protocol converter.
How is calibration performed?
Zero and span calibration is executed per channel using the front-panel menu and certified calibration gas. No PC or software is required—only a calibrated gas source and appropriate regulator.
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