Chapter 5 Explanations
Mini-Switch LB 471
5.3 Bulk Cone Measurement
Bulk cone measurements can only be carried out with scintillation
detectors.
The required calibration has to be carried out in the professional
mode, since the limit value has to be set specifically.
With bulk goods, the monitoring level is determined at a defined
bulk cone diameter. For the measurement to work well, the count
rate at the switch point has to differ significantly from that at full
and at empty container. If the configuration has been calculated
by BERTHOLD TECHNOLOGIES, this has already been taken into ac-
count. The measurement configuration has to be installed at that
point where the bulk cone diameter is to be monitored.
Calibration process:
1
Determine empty count rate
2
Full count rate
3
Calibrate with code 36
4
Set switch point
There are three ways of setting the switch point:
Bulk height under operating conditions
(often not feasible for technical reasons)
Simulate bulk cone using steel or lead plates
Calculate count rate for bulk cone
Simulation with steel or lead plates is preferable to calculation.
Control bulk height under operating conditions
After the bulk height with the specified bulk cone diameter has
reached the monitoring level, read off the count rate in code 11
and enter this value in code 18.
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