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MGS-250 Manual

6490-9000 Revision 1 31

4.4. Alarms

The following occurs during an alarm condition.

Table 9: MGS-250 Behavior during Alarm Conditions

Item Behavior During Alarm State

Green LED On (solid)

Display On (blinks); reports detected PPM concentration

Audible Alarm

On (if enabled and after programmed delay

expires)

Relay Output Activates (after any programmed delay expires)

Analog Output

Changes proportionally with gas concentration

(as configured)

Modbus Registers

Registers indicate the alarm condition, ppm

concentration, etc.

NOTE: The alarm feature includes a 20% dead

band to

prevent alarm ‘chatter’ if the concentration hovers near the

alarm setpoint. Once the alarm has been triggered it will

remain latched until the concentration drops below 80% of

the alarm setpoint.

4.5. Gas Detector Faults

4.5.1. Overview

There are two levels of fault monitoring built into the gas detector.

• Non-critical

• Critical

4.5.2. Non-Critical Faults

Non-critical faults typically recover by allowing the gas detector

surroundings to stabilize, for example, after a defrost cycle. The gas

detector continues to monitor its surroundings during non-critical faults,

but may report inaccurate readings.

The following occurs when a non-critical fault condition exists.

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Bacharach MGS SERIES Especificações Página 31