IM-P402-72 AB Issue 6
7
Capacitance probe
input (Voltage)
Capacitance probe
input (Voltage)
Reducing output
with increasing input
Not used
Not used
4 - 20 mA output
Filter 1
Filter 1 / 2
Current input (4 - 20 mA)
Current input
(4 - 20 mA or 0 -2 V)
Increasing output
with increasing input
0 - 20 mA output
Filter 2 / 3
Filter 3
12
3
4
5
6
7
8
ON
Fig. 3 Ex-works settings are as shown above (in bold text)
4.7 Wave filter - Switches 7 and 8
This feature averages the signal over a longer period for conditions where waves and high
turbulence may otherwise cause continuous oscillation of the output signal, giving over-frequent
valve movement.
The unit is supplied set to Filter 1 position, the least damped response, with Switches
7 and 8 OFF. This position is generally suitable for tanks and small to medium output boilers with
a reasonably steady steam demand.
For Filter 2 position, medium damped response, set Switches 7 to ON and Switch 8 to OFF.
This position should be selected if turbulence is causing the output signal to oscillate, causing
over-frequent valve actuation.
For very turbulent conditions (High output boilers subject to wide variations in steam demand),
set Switches 7 and 8 to ON.
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