User guide

49
6Setupwiththedisplayandadjustmentmodule
MINITRAC 31 • Foundation Fieldbus
41782-EN-131119
You can enter the value for "Adjustment uncovered" (ct/s) manually.
You can have the value for "Adjustment uncovered" determined by
MINITRAC 31.
This menu item appears only if you have selected "Single point
adjustment" as adjustment mode (Setup/Adjustment mode).
Inthismenuitemyoucanadjustatwhichpercentagevalueofthe
max.pulseratethesensorshouldswitchover.
Since in most cases the radiation is almost completely absorbed
whenthesensoriscovered,thepulseratewhenthesensoriscov-
eredisverylow.
Thechangebetweenthetwostatusesissucientlyclear.
Hence a percentage value of 90 % for the Delta I value is recom-
mended.
Youselectlowervaluesforsensitivedetectionofmaterialconesor
buildupwhichcauseonlypartialabsorptionoftheradiation.
This menu item appears only if you have selected under adjustment
mode (setup/adjustment mode) the "Two-point adjustment".
Inthismenuitemyoucansetthemin.pulserate(ct/s)atwhichthe
sensorshouldswitchover.
Fill the vessel until the MINITRAC 31 is covered.
You thus get the min. pulse rate (ct/s) for the "covered" adjustment.
Entertherequestedpulseratemanuallyorlettheratebedetermined
by MINITRAC 31. Automatic determination of the pulse rate should be
given preference.
You can enter the adjustment point (ct/s) manually.
Setup - Delta I (single
point adjustment)
Adjustment "covered"
(two-point adjustment)