Endress+Hauser gammapilot FTG 671, Руководство по эксплуатации

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Pocedure for standard
calibration with
background calibration
Step Matrix Entry Significance
1 V3H0 5 Commission as in Section 4.1, select background calibration
2 V0H1 »E« With the barrier free, wait min. 100 seconds,
press »E« to register countrate
3 V0H2 »E« With the barrier covered (or with radiation turned off),
wait min. 100 s, press »E« to register countrate
4 V0H9 »E« With the barrier covered and the radiation source
switched off wait min 100 s;
press »E« to register countrate.
5 V0H4 e.g. 10 Enter integration time
τ,
see p. 37,
»E« register entry with »E«
After completion of the calibration:
•
A normalised countrate (0
…
100) is displayed at V0H0
•
The limit relays trip at the default values, see Section 4.5.
•
When all parameters have been entered, the calibration fields V0H1 and V0H2 are
automatically protected against accidental entries. Provided that no general
parameter lock is in force, reselection of calibration mode enables them again.
Note!
•
The alarm LED flashes (Warning E 630) until all parameters have been entered.
•
The integration time
τ
is automatically set to 20 s during calibration (5x
τ
=100s)
even if the value in V0H4 is less. If the time set
τ
>20s, the waiting time is 5x
τ.
•
For a repeat calibration, enter 1 at V3H0, then the new calibration date at V3H4.
•
The background calibration can only be used with detector DG 57.
4.3 Standard calibration (normal) without background
calibration (for DG 17 and DG 27)
For applications with the detectors DG 17 or DG 27 the local dose rates are that high,
that the background radiation needs not to be taken into account. In these cases a
shortened calibration procedure can be used:
Step Matrix Entry Significance
1 V3H0
…
1 Commission as in Section 4.1, select standard calibration
(normal)
2 V0H1 »E« With the barrier free, wait min. 100 s
press »E« to register countrate
3 V0H2 »E« With the barrier covered, wait min. 100 s
press »E« to register countrate
4 V0H4 e.g. 10 Enter integration time
τ,
see p. 37, register entry with »E«
»E«
Gammapilot FTG 671 Chapter 4: Calibration and Operation
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