Calibration - GE Sensing RPT 301 User Manual

RPT 301 User Manual

4 Calibration

The instrument is supplied with a calibration certificate.
instrument to stay accurate it is recommended that it is checked every
12 months.
The use of a Class A compensated deadweight pressure standard is
recommended.
The following procedures should be carried out in a controlled
environment by qualified personnel.
If the accuracy of the instrument is not within the specification, carry out
a calibration adjustment procedure.
A qualified person must have attended a product training
course given by the manufacturer or appointed agent and
successfully completed the training course on this equipment.
The manufacturer offers a comprehensive and, if required,
NAMAS accredited calibration service.
Calibration Check
A calibration check should be carried out at chosen intervals. The
readings of the instrument should be compared with a pressure standard
and, after any adjustments for accuracy (traced to National Standards),
the differences recorded.
compared with the required accuracy for the instrument. If necessary
a calibration adjustment can be carried out.
The recommended procedure is to check at increasing and then
decreasing intervals of 0, 20, 40, 60, 80 and 100% of full-scale.
C - User Calibration (Linearity/Drift Compensation)
This command performs a `best straight line fit' to the remaining errors
of the transducer or does a single pressure point correction. Entering
one pressure point causes the offset between the transducer and the
pressure standard to be added/subtracted across the whole pressure
range. Entering two pressure points (near zero and near full-scale)
cancels zero and full-scale drift. Entering more pressure points reduces
the remaining non-linearity and makes the zero and full-scale correction
more accurate.
The adjusted differences can then be
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K177 Issue No. 3