BERTHOLD TECHNOLOGIES LB 480, User Manual

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02.2017
Menu Structure Volume 3
IMPORTANT
The function RAPID SWITCH should not be enabled when the
measurement is installed into a control loop, since this function
works with two different time constants.
2 Io Factor
Defines the threshold where the interference radiation detection
responds. With the default value of 1.5, the threshold is 1.5 times
the active empty count rate and is suitable for most applications.
You can adjust the factor for the threshold yourself. Note that a
value below 1.5 may trigger faulty switching caused by fluctuations
in the measured values. Increasing the factor decreases the sensi-
tivity. Increase the factor if false alarms are triggered by significant
fluctuations in the measured values, for example, by agitator
blades.
3 Waiting Time
If interference radiation is detected, the measurement is "frozen"
and will be released at the earliest after the waiting period is over.
You have to enter the value for the waiting time in seconds.
4 RI Sigma
RI Sigma must be set correctly to detect changes caused by inter-
ference radiation within the measuring range. This value is the
threshold where the interference radiation detection responds if a
sudden increase in radiation occurs. The higher the value, the
higher the threshold and the less likely the response to interference
radiation.
The default value of 10 is suitable for most applications.
With irregular levels, e.g. due to agitators, the interference radia-
tion detection would be triggered constantly due to strong level fluc-
tuations. In these cases it may be necessary to define a higher
Sigma value. To turn the Sigma function off, you can enter the num-
ber
0 .
Choose a low value if you need a fast response time of a few sec-
onds (3 to 10 seconds). Choose a high value if the filling is slow, and
therefore there are no great demands on the response time.
5 Meas Delay Time
If interference radiation detection is enabled, the measured values
are output with a delay. The delay is adjustable from 0 to 5 seconds.
The delay is required so that at the moment of detection the mea-
sured value remains unaffected, because in this case, increased
count rates are already present which may distort the measured
value.