• Entrance monitor for complete gas detection system
• Centralize the status of up to four Bacharach diffusion gas detectors
• Combine with the MGS-408 gas controller and the detectors for complete system
• Can be configured as controller when not connected to Modbus controller
• Signals via digital bus, relays, and/or audible and visual output 

The Bacharach MGS-401 Entrance Monitor provides improved safety for entrances to monitored areas such as mechanical rooms or walk-in freezers and coolers. The MGS-401 provides clear visual and audible alarms when in alert mode and can also display gas concentrations in the area that is being monitored helping with compliance of IIAR, ASHRAE 15, CSA B52, EN378.

The MGS-401 Entrance Monitor centralizes the status of up to four Bacharach diffusion Gas Detectors, which in turn provides an audible and visual alarm outside a monitored space. In addition, the MGS-401 displays any gas concentration level in the space for additional information and visual monitoring. System configuration will determine whether the alarms signals are addressed in the monitored space or at a controller or BMS/BAS level.

Combining the MGS-401 Entrance Monitor with the Bacharach MGS-408 gas controller and diffusion gas detectors provides a complete, single-source gas detection system with an easy means of achieving compliance with refrigeration safety standards such as IIAR, ASHRAE 15, CSA B52 and EN376.

Monitor one, or up to four detectors individually and display:

• Channel
• Alarm level
• Concentration
• Gas
• Unit 

During normal operation, the MGS-401 will monitor the connected gas detector(s) and display the monitored location gas concentration as provided by the gas detectors in the location. If the gas detectors in the monitored area respond to any preset alarm level or a fault occurs on the system, the MGS-401 Entrance Monitor will display that information on the LCD and respond with audible and visual alarms, configured relay response and other countermeasures that are connected or configured.

1. Integrated visual alarm in bezel

2. Controller power and fault LED’s

3. Mute alarm button

4. > 80 dB alarm

5. 1/2-inch NPT cable glands (x2) 

1. Power terminal

2. Modbus to gas detectors

3. Modbus to BMS

4. Remote silence alarm input

5. Forced alarm input

6. Aux buzzer output

7. Alarm relay