Endress+Hauser gammapilot FTG 671, Operating Instructions Manual

Page: 37 / 64

4.4 Auxiliary calibration
It is not always possible to calibrate as described in Section 4.2, e.g., it might not be
possible to empty the vessel sufficiently to uncover the barrier. In this case an auxiliary
calibration can be made, to be completed at a later date when the vessel is empty.
Procedure for auxiliary
calibration
Step Matrix Entry Significance
1 V3H0
…
2 Commission as in Section 4.1, select auxiliary calibration
2 V3H9 ... Enter the local dose rate for empty at the detector (in
µ
Sv/h)
(Check with Hauser)
3 - »E« Register entry
4 V0H2 »E« With the barrier covered, wait min. 100 s, see note p 29.
press »E« to register countrate
5 V0H4 e.g. 20 s Enter integration time
τ,
see p. 37, register entry with »E«
The auxiliary calibration can be completed later by calling up the recalibration mode:
Recalibration
Step Matrix Entry Significance
1 V3H0 4 Select recalibration mode
2 - »E« Registers entry
3 V3H4 YWWD Enter date of recalibration
4 - »E« Registers entry
5 V0H1 »E« With the vessel empty, wait 100 s, see note,
press »E« to register countrate
Note!
•
The alarm LED flashes (Warning E 630) until all parameters have been entered.
•
For a repeat calibration, enter 2 at V3H0, then the new calibration date at V3H4.
•
The field for today’s date (V3H5) is enabled only in calibration mode 3!
•
The recalibration can be called for any parameter V0H1, V0H2, V0H9
BA082E29
Covered, V0H2
Local dose rate
V3H9 for empty
vessel
Fig. 4.3:
Parameters required for
provisional calibration
Gammapilot FTG 671 Chapter 4: Calibration and Operation
35