Re-Calibration - Omega HHP360 Series User Manual

Re-Calibration

The HHP360 can be re-calibrated in the field for zero, span, and
linearity. The proper primary standards must be available prior to
calibrating the unit. These standards should meet the accuracy
requirements for your company or industry. The factory follows
guidelines established by ANSI / NCSL Z540-1-1994 which
requires that the primary standard be 4 times more accurate than
the unit under test.
The re-calibration is not intended to replace the Factory Lab
Calibration Procedure. It is intended to correct the curve fit if the
actual sensor characteristics change slightly over time.
For sensors up to 200 PSI, a ±0.0015% of reading deadweight
tester is recommended.
1-point (within upper 50% of Full Scale), 5-point (nominal values
of 0%, 25%, 50%, 75% & 100% of Full Scale), and restore factory
default re-calibration options are offered. For the 5-Point re-
calibration, points 2, 3 and 4 can be adjusted within ±1% of
reading around the nominal values. Point #5 can be adjusted within
-1% of reading around nominal. Point #1 is fixed.
For example: for a 2000 inH2O sensor, Point # 2 (25%) can be
edited form 495 to 505 inH2O. Point #5 (100%) can be edited
from 1980 to 2000 inH2O.
The unit can only be re-calibrated if the calibration points are
within 5 times the accuracy of the original factory calibration (e.g.
@ 0.05% accuracy, the point limit is ±0.25% of Full Scale). If the
re-calibration procedure generates a new value outside this limit
the procedure will fail. In this case the unit would need to be
returned to the factory for service.
Once a re-calibration has been performed (either 1-point or 5-
point) the unit will continue to allow future re-calibrations only
with that type of re-calibration. In order to enable the other re-
calibration type, the user must first restore the re-calibration data to
the factory defaults.
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