Channel Setup
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MXD70 Dissolved Oxygen
Setup and Operating Guide
Channel Setup
Pressure Damping
The facility has been provided to allow the user to
dampen the effect of rapid changes in pressure,
which might lead to the setpoint relays activating
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 front display for 20 seconds.
After the 20 seconds have expired the unit will
update the sensor readings, compensated to what
ever level the pressure has settled to having allowed
the sensor to “catch up”.
If the pressure 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 “ACK” button whilst on the front screen.
To use this facility set this menu item to “Enable”. This
then enables two limit items. Limit A “From” and
Limit B “To”. These operate as shown in the following
examples:
If Limit A “From” is set to 1.00Atm and Limit B “To” is
set to 2.5Atm, then when the input pressure rises
from an input below 1.00Atm to one greater than
2.5Atm, them pressure damping will be applied.
Alternatively 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.
Menu only available when Pressure Compensation is
set to “Auto”.
/ – Select Option
EXIT
– Cancel
– Save Selection
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