Berthold LB 444 K-40 - Error Message Handling

01/10 347 LB 444 K-40
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The measurement is started in the batch mode by pushing the <run> button and stops
automatically when the entered time is over
or
or briefly (>1s) connecting the terminals 26a and 26c.
Once the entered time is over, the measurement is stopped automatically.
In both cases, the current signal remains on the last value until a new measurement is
started.
7.7 Radiating Interference Detection
Select the function Radiating interference (menu Parameter, see page 24) to suppress
interfering radiation (e.g. weld seam testing).
Caution:
When this function is on (Radiating Interference <ON>), the automatic switchover of the
time constant (function Rapid switchover) is always off.
When turning this function on, you have to define a Sigma value, which defines a window
for the measuring signal. If the detector signal suddenly exceeds this threshold
• the measurement stops
• the error message “Interference Radiation” appears on the display.
The measured value and the current outputs are held on the last value.
Reset the error message and start the measurement via the keyboard by confirming the
error message with <enter>; then start the measurement with <run> or externally
via
the digital input.
Note:
Enter n > 5 to rule out false alarms with sufficient statistical safety.
For calculation it holds: Sigma =
Is/
Example:
Count rate I
m
= 300 cps, n = 6
I
S
= I
m
+ n * Im
I
S
= 300 + 6 *
300
= 404 cps
Thus, an alarm is signaled as soon as I/s exceeds the value of 404 cps.
Note:
Due to the dynamic behavior of radiating interfering detection, a quick increase of the
pulse rate due to operative factors (e.g. very fast emptying of the vessel or major short-
term concentration changes caused by stirrers) may be interpreted as interfering
radiation.
For example, opening the active beam channel on the shielding can also cause a quick
increase of the pulse rate. You have to reset the alarm that is then triggered, or better,
do not enable radiating interfering detection at first. Enable radiating interfering
detection only after calibration has been performed.