Calibration - Ametek Crystal HPC51 Operation Manual

CALIBRATION

If adjustment is required, we recommend returning the HPC50 to the factory. Factory service offers benefits you won't find anywhere else. Factory calibra-
tion tests your HPC50 at a variety of temperatures utilizing NIST traceable standards, resulting in calibration certificates that provide performance data over
temperature. Our calibration facilities are A2LA accredited (cert #2601.01) to ISO 17025:2005 & ANSI/NCSL Z540-1-1994. A2LA is internationally recognized as
an accreditation body by the International Laboratory Accreditation Cooperation, ILAC. Furthermore, upgrades may be available to add or enhance operating
features. We designed the product to last, and we support it so that you can get the most from your investment.
Under normal operating conditions, we recommend the HPC50 be calibrated on an annual basis. Your quality system may require more or less frequent
calibration, or your experience with the gauge, or operating environment may suggest longer or shorter intervals.
Although we prefer that you return the HPC50 to us for calibration, ordinary recertification and/or adjustments may be performed by any qualified personnel
with appropriate training and equipment. The following instructions are ONLY intended for such qualified personnel with appropriate test equipment. We
recommend that the calibration standards used have a minimum rated accuracy of 0.008% of reading, or equivalent in terms of percent of full scale. This level
of accuracy requires the use of piston (deadweight) gauges or very high performance pressure controllers.
There are no internal potentiometers. Each of the HPC50's sensors has a "span factor" (userspan), set to approximately 1 (as shipped from
the factory). As components age this may need to be changed to a value slightly higher or lower, to slightly increase or decrease all readings. This adjustment
can be made with a computer through CrystalControl.
Calibration of P1 and P2
"Zero" the HPC50, then record displayed pressure for two or more pressure points. Determine if the HPC50 would benefit from an overall
increase or decrease of the indicated pressures. Adjust userspan accordingly and validate results.
Calibration for Barometric Reference Module (BARO)
The BARO module can be calibrated by selecting the Edit Calibration Data button while within the BARO Config screen. Enter Userspan
and Offset information directly, or you can use the Calibration Wizard to calculate the optimum values for a 1 or 2 point calibration.
1
Remove the mounting bracket on the back of the HPC50, exposing the barometric sensor port.
2
Connect a flexible 4.8 mm [3/16"] ID tubing from your clean pneumatic calibration reference to the BARO sensor.
You can also order the BARO calibration kit (P/N 4547), which includes the tubing.
!
CAUTION: Do not subject the BARO sensor to pressures less than 700 mbarA (10.153 PSIA), or greater than 1100 mbarA (15.954 PSIA), as this may
cause permanent damage. Use only clean a clean dry pneumatic source.
!
CAUTION: Direct contact with the surface of the BARO sensor may cause permanent damage. Direct sunlight on exposed BARO sensor may affect
readings slightly.
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HPC50 Series Operation Manual