Crystal GaugeCalHP Pressure Comparator User Manual
Page 14
Operating Instructions
12
GaugeCalHP Comparator Operation Manual
X
Perform a Quick Test Calibration
An alternative method eliminates the time required to wait for thermal pressure stability. This method works with the Crystal XP2i and nVision, but not with
the 30 Series.
1
Set the reference to detect peaks and clear any stored peak value.
2
Slowly increase pressure to the first major graduation on the device under test (or to the first calibration point).
Increase pressure slowly, so that you don’t overshoot the mark (or point).
The maximum pressure displayed on the reference will be the pressure that was applied—even if actual pressure drops again immediately.
3
Record the peak reading and continue to the next test point or mark.
If you are also checking the gauge for hysteresis, the procedure is the same, except that you start at full scale and set the reference for the peak low. Elimi-
nating the time required to wait for thermal equilibrium, significantly shortens the amount of time it takes to calibrate a gauge.
Note:
To automatically collect the readings directly from the reference, use
X
To vent the system
Turn the handle counter-clockwise until it stops.
Vacuum Use
X
To Generate Vacuum
1
Loosen the reference indicator about 3 turns counter-clockwise.
2
Turn the handle clockwise and verify that fluid is dripping out of the CPF weep hole into the drip tray. Continue to turn the handle until it stops.
3
Tighten the reference.
4
Rotate the handle counter-clockwise to generate a vacuum.
You can generate up to -12.5 psi.
Note:
Be aware that the system will vent during the last inch of travel.