BERTHOLD TECHNOLOGIES LB 480, Руководство пользователя

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54733-10BA2L
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02.2017
Menu Structure Volume 3
Gas pressure < 1 bar
Gas densities with a pressure below 1 bar are generally negligible.
Therefore, you can enter 0 kg/m
3
.
Gas pressure > 1 bar
Determine the gas density under operating conditions very carefully
in order to keep the error of the automatic compensation as small
as possible. Better and more accurate would be the measurement
of the empty count rate with gas and a gas density that is likely to
be below operating conditions.
Gases with hydrogen
If hydrogen is present in the gas, then the absorption of the Gamma
radiation is greater than would be expected by the actual gas den-
sity. This effect can be compensated by a increasing the gas density
to be entered. If you cannot determine the increased absorption,
please contact BERTHOLD TECHNOLOGIES.
6 Gas Density at Op
 Visible only if Compensation Mode is set to MANUAL GDA .

Enter the gas pressure in kg/m
3
you expect under operating
conditions.
Use this parameter only if the gas density during calibration is dif-
ferent from the gas density under operating conditions.
Using the gas density, a compensated count rate is then calculated
from the count rate in
Lower Cal Pt-Empty ( Device Config

Setup

Cal Parameter

Cal Points

Cal Rate at OP ), which
you can read off under Op Lower Point .
Prerequisite for the proper correction are correct entries in the fol-
lowing menu items:
– Setup Gas Density
– Op Gas Density
– Measuring Path
– Nuclide
Gas pressure < 1 bar
Gas densities with a pressure below 1 bar are generally negligible.
You may therefore enter 0 kg/m
3
.
Gas pressure > 1 bar
Determine the gas density under operating conditions very carefully
in order to keep the error of the automatic compensation as small
as possible. Better and more accurate would be the measurement
of the empty count rate with gas and a gas density that is likely to
be below operating conditions.