Vega MINITRAC 31 Operating Instructions Manual page 34

6 Set up with the display and adjustment module
Damping
X-ray alarm
Relay
34
Enter now the corresponding level (m).
By doing so, you assign a corresponding level to the actual count rate.
Accept the value pair with " OK".
Depending on whether you started with a full or an empty vessel, you
have to continue emptying or filling the vessel.
Carry out such a linearisation with several different filling heights even
if you have a linear vessel.
A maximum of 32 linearisation points is possible.
In this menu item you can adjust the damping of the sensor. With
it you can suppress fluctuations in the measured value indication,
caused e.g. by an agitated product surface. This time can be between
1 and 1200 seconds. Keep in mind that the reaction time also in-
creases and the instrument reacts to quick level changes with a delay.
Generally a time of approximately 60 seconds is sufficient to smooth
the measured value indication.
Radiation from external sources can influence the measuring result of
the sensor.
Possible external radiation sources can be, for example, a weld joint
test on a neighbouring facility or other radiometric instruments.
An X-ray alarm is triggered if the impulses (ct/s) are more than 25 %
above the max. value from the linearization table.
This fault message is only output for the period of the increased X-ray
radiation. Then the fault message is automatically reset.
In this menu item you can determine the behaviour of the sensor
when external radiation sources appear.
In this menu item you can activate the relay output and determine its
function as well as the switching points.
When the output of the process values is set, you can choose be-
tween overfill and dry run protection.
The relay outputs of the sensor react accordingly.
You can choose " no" reference value. In this case, the relay output
operates as fail safe relay.
This does not apply if " X-ray alarm" is selected as reference value. In
this case the fault message is not active.
Caution:
Independent of the selected reference value, the relay will deenergize
in case of failure.
Except with " X-ray radiation" as reference value. In this case a failure
signal is not active.
MINITRAC 31 • Foundation Fieldbus