Bacharach MGS-400, User Manual

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1100-2294 Rev 1 22
4. Operation
4.1 Overview of Normal Operation
WARNING: Before leaving the instrument for normal operation, check the
configuration for proper settings and check calibration.
4.1.1 Applying Power & the Start-up Sequence
After applying power, the instrument will go through a start-up sequence (initialization,
audible/visual test and self-test sequence). After start-up sequence completes, the instrument
will enter a warm-up period to allow the sensor element to stabilize before reporting a valid
output.
1. Switch power on.
2. Observe the start-up sequence and warm-up phase:

Green LED will blink at 0.5 HZ for about 5 minutes.

Modbus flag for warm-up is set.

Buzzer is off.

Relay state is “no alarm.”

Gas reading is invalid.
3. Observe normal operation:

Green LED is steady on.

Modbus flag for warm-up is cleared.

Buzzer is off.

Relay state is “no alarm.”

Gas reading is valid.
4.1.2 Verifying Analog Signals
MGS-450 / 460 gas detectors feature a single configurable analog output. During normal
operation, the analog output of the instrument is proportional to the detected gas concentration.
Output level is proportional to the gas level as shown below:
Gas Concentration 1-5V 0-5V 2-10V 0-10V 4-20mA
0% 1V 0V 2V 0V 4 mA
50% 3V 2.5V 6V 5V 12 mA
100% 5V 5V 10V 10V 20 mA