Example
If using a 4-20 mA sensor with a range of 0-10 psi:
l
Set the 4 mA to 0 psi
l
Set the 20 mA to 10 psi
l
The Alarm Max was set at 8 psi
l
The Warning Max was set at 7 psi
l
The Warning Min was set at 3 psi
l
The Alarm Min was set at 2 psi
A
L
W
L
2psi
3psi
A
H
W
H
9psi
8psi
20mA
10psi
4mA
0psi
A
Figure 23 - Set Alarm / warning levels
A
Current (A) / Pressure (psi)
An alarm event is indicated by the solid lines (A
L
, A
H
) on the graph. During an alarm event the pump
will show the alarm red screen and stop. This alarm is triggered by the sensor signal being equal to or
greater than that set by the Alarm Max/Min or Ethernet Hi-Hi/Lo-Lo Parameters. The user has to
acknowledge this screen on the pump.
A warning event is indicated by the dashed lines (W
L
, W
H
) on the graph. During a warning event the
pump will show orange sections on the screen and a warning bit will flag on the Ethernet
communications. This event is triggered by the sensor signal being equal to or greater than the value
set by the Warning Max/Min or Ethernet Hi-Lo/Lo-Hi Parameters.
Note:
It is normal to expect fluctuations in both pressure and flow systems using peristaltic pumps.
This means that warning and alarm limits need to take short term spikes and changes into account
when setting these limits.
Note:
The pump has no control over the accuracy of the signals coming from the sensors and will
simply respond to the signal levels received. Sensor accuracy is the responsibility of the sensor
supplier and will be dependent on a range of system variables, for example fluid type, tube material
and temperature.
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