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3 Device overview
Light emitting diodes
30
LED
Power
Flow
Alarm
Warning
Reset
Calibration
Service
Control panel
Manual USM GT400 · EN10 · May 2021
1 Flow
6 Calibration
2 Power
3 Alarm
7 Service
4 Warning
5 Reset
8 Button states
Fig. 3.4: LEDs of the electronic ultrasonic electronics
Illuminates
continuously
Voltage supply is
switched on
Gas flow present.
Alarm message is
stored.
Warning message is
stored.
Reset is running.
Calibration switch is
open.
Service switch is open.
Panel is being pressed.
(calibration switch state)
(service switch state)
flashing
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Alarm is active.
Warning is active.
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