12 Pressure Input
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Pressure Damping
The facility has been provided to allow the user the dampen the effect of rapid
changes in pressure that might lead the unit to activate the set point relays before
the sensor has had a chance to react to the change in pressure (which would give
a false reading). When activated the unit will hold the sensor readings and flash a
“Pressure Damping” message on the display for 20 seconds. After twenty
seconds expires the unit will update the sensor readings, compensated to
whatever level the pressure input has settled to having allowed the sensor to
“catch up”. If the pressure input returns to the level it was at prior to damping
being applied, then the damping will be cancelled, whether the twenty seconds has
expired or not. The user may also cancel the pressure damping by pressing the
“ENTER” key when the “Pressure Damping” message is flashing on the display.
To use this facility simply set the “Damping” item in the “Pressure Input” menu to
“Enabled”. The limits A (“From”) and B (“To”) can be tailored by the user to
provide the necessary response. For example :
(i) If Limit A (“From”) is set to 1.00Atm and Limit B (“To”) is set to 2.5 Atm, then
when the input pressure rises from an input below 1.00Atm to one greater
than 2.5Atm, pressure damping will be applied
(ii) If Limit A (“From”) is set to 2.3Atm and Limit B (“To”) is set to 1.2Atm, then
when the input pressure falls from an input above 2.3Atm to one less than
1.2Atm, pressure damping will be applied.
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