Endress+Hauser Gammapilot FMG50 - 8.8 Real-time Clock and Decay Compensation

Gammapilot FMG50 Diagnostics and troubleshooting
Endress+Hauser 91
2. After changing the type of calibration to one point calibration, perform the one point
calibration using the Commissioning Wizard.
Only change the type of calibration in the operating menu. If the type of
calibration is changed in the Commissioning Wizard, the existing absorption
coefficient of the current calibration is replaced by the default value 7.7 mm
2
/g. This
would require a complete recalibration of the measuring point. In this case, the µ-
value can be taken manually from the commissioning documentation and entered
instead of the default value.
8.8 Real-time clock and decay compensation
8.8.1 General principles
For decay compensation, the Gammapilot FMG50 contains a real-time clock, which is
generally powered by the terminal voltage. This clock is backed up by a battery to bridge
voltage interruptions.
The battery must have a sufficient remaining capacity to ensure the clock works correctly
and continues to keep the correct date if power is interrupted.
The battery discharges during the operating life of the device. The process is temperature-
dependent: self-discharging is faster at high ambient temperatures.
To keep self-discharging to a minimum, do not store the devices at high temperatures
for a prolonged period
8.8.2 Setting the real-time clock
If the battery capacity is low, the error message M434 "Real-time clock battery is empty"
is displayed
In this case, the date must be reset after every power interruption or the battery must be
replaced.
The battery can only be replaced by Endress+Hauser Service
Setting the time
1.
 Application → Sensor → Sensor Trim Gamma
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2. The time on the clock of the operating device (connected PC or Bluetooth device) is
set by pressing the "Set system time" element.
Clock setting in as-delivered state: universal time coordinated (UTC).