71X Series
Calibration Manual
82
Pressure Measure
The 718Ex Pressure Calibrator has built-in temperature compensation. Instruments being
calibrated should be in a stable temperature environment for several minutes before
calibration. Calibration facilities should be maintained near 23 °C nominal.
Re-calibration (re-characterization) is performed in terms of ‘PSI’ pressure units. Inputs
using other pressure units (ie. kPa and bar) must be mathematically converted.
1. Remove two-wire test lead from the 718Ex Calibrator and carefully attach the
pressure fitting of the deadweight tester to the pressure jack on the 718Ex Calibrator.
Note
The use of TEFLON tape at the pressure fittings strengthens the seal. For
versions 2.0 and higher, the upper display should show the appropriate
pressure sensor range. The range is set through the production process and
cannot be changed.
2. For version 2.0 and higher, skip to step 4. For version 1.9 or lower, the lower display
shows rAnGE. This is an indication to choose the correct model of the 718Ex
Calibrator. The appropriate range for the 718Ex 30G is 30 and 100 for the 718Ex
100G. Choose the correct range.
3. The upper display shows 30, which is the default pressure range. Pressing
changes the sensor range to 100 PSI, pressing changes it back to 30 PSI.
4. When proper range is shown, push
on the 718Ex Calibrator.
5. Vent the system to ambient air to ensure 0.00 PSI.
6. The lower display indicates C 0 PSI and the upper display indicates the current
reading. When the unit is vented (step 5) the upper display will read 0.00 ±
approximately 10 % of full scale. When
is pressed, the lower display indicates
the next pressure to apply. Apply the requested pressure that shows on the lower
display and when the upper reading is stable, push
. Repeat this until CHEC
appears on the display.
7. The CHEC mode allows for a quick check of the calibration constants that have just
been stored. Changes to the applied pressure reflect on the display. Push
to
continue. The unit will then reset power.
8. The 718Ex Calibrator is now out of the CAL mode and into the normal mode of
operation. Carefully vent all pressure, push to turn the calibrator off, and
disconnect all pressure fittings.
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