28
5.0 Operation
Test Pressure and/or Flow Pressure Calibration Steps:
Calibration
1. Make sure there is no pressure source
connected to the pressure transducer being
check and
verify
zero (0) pressure is being
read.
2. Enable write access to calibration register for
the pressure transducer being calibrated by
pressing the
UNLOCK
button.
3. Zero the pressure transducer being calibrated
by pressing the
ZERO
button.
4. Remove the
Low
port vinyl hose from the
pressure transducer being calibrated and
connect a calibrated vacuum pressure source
to the
Low
port and then apply a pressure of
25 inH
2
O.
5. Enter the applied pressure value from the
calibrated vacuum pressure source by writing
the value into the appropriate
APPLIED
field.
6. Once the calibration value has been entered
in step 5, adjust calibration of the appropriate
pressure transducer by pressing the
ADJUST
button.
7.
Slowly bleed off calibration pressure to zero
pressure and disconnect the calibrated
vacuum pressure source from the transducer.
Re-connect any vinyl hose removed in step 4 to
the appropriate pressure transducer.
8. Calibration is now complete, disable write access to calibration registers for the pressure transducer
being calibrated by pressing the
LOCK
button.
An abrupt change in pressure may result in damage
to the sensor being calibrated. Make certain that
the input pressure is set to zero before introducing
pressure at a slow pace. When finished calibrating,
slowly bleed off the pressure before removing from
the sensor being tested.
!
WARNING
Once the calibration value is applied, the original
calibration data will be overwritten and cannot be
retrieved.
CAUTION
Figure 5.11: Pressure Transducers
Test Pressure
Transducer
0-100 inches of
water (inH2O)
Flow Pressure
Transducer
0-50 inches of
water (inH2O)
Low
High
