Endress+Hauser gammapilot FTG 671, Operating Instructions Manual

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6 Maintenance
When using the DG 57 detector, the following parameters should be checked in regular
intervalls (approx. 6 month):
Sensor temperature °C (V7H3)
This field displays the highest temperature which has been present at the DG 57 during
operation. If the limit of 50 °C is permanently exceeded, countermeasures have to be
taken, e.g.
•
usage of a detecteor with water cooling jacket
•
thermal screening
•
change of mounting position
Current reference % (V7H4)
This parameter is a measure for the relative sensitivity of the detector. It is used internally
by the software in order to compensate for sensitivity changes which might occur in the
course of time.
The value should be between 30% and 80%.
If the value is beyond this range, the inspection frequency should be increased (approx.
every 3 months) and replacement of the detector should be scheduled.
If the value is below 5% or above 95%, the detector should be replaced.
Gammapilot FTG 671 Chapter 6: Maintenance
47