43
K415 Issue No. 1
General
The instrument is supplied by the manufacturer, complete with calibration certificate(s). A
calibration period of 12 months is recommended. The actual calibration interval
depends on instrument usage and the total measurement uncertainty acceptable for the
specified application.
The DPI 610 and DPI 615 are very precise measuring instruments and the test equipment
and conditions of test must be suitable for the type of work. A Class A compensated
deadweight tester must be used. The calibration check and calibration adjustment
should be carried out in a controlled environment by a calibration technician*.
The manufacturer offers a comprehensive and, if required, UKAS or NIST accredited
calibration service.
*
A calibration technician must have the necessary technical knowledge,
documentation, special test equipment and tools to carry out the calibration work
on this equipment.
Calibration Check
At the chosen calibration interval, the instrument readings should be compared with a
known pressure standard.
The recommended method starts at 0, increasing in 20% steps to 100% full-scale and
then decreasing in 20% steps to 0.
Note any deviations between the instrument and the pressure standard and consider
traceability (accuracy to a National Standard).
If, after a calibration check, the results exceed the tolerance in the specification (or other
suitable performance standard), carry out a calibration adjustment.
Calibration Adjustment
If the instrument is operating correctly, only zero and full-scale calibration will vary. Any
excessive non-linearity or temperature effects indicate a fault. The instrument should be
returned to a qualified service agent.
Guide to Calibration Procedures
• Use high quality
Repeatable and Linear
pressure sources and allow adequate
thermal stabilization time before calibration (minimum 1 hour).
• Conduct the calibration in a temperature controlled and preferably, humidity
controlled environment. Recommended temperature is
21°C, ±2°C (70°F, ±4°F)
.
• Use deadweight testers carefully and away from draughts.
• Review and become familiar with the whole calibration procedure before
commencing the calibration process.
• The calibration routines cannot be accessed when the instrument is in
BASIC
mode.
Use the
TASK
key to select another mode (e.g.)
ADVANCED
before accessing the
CALIBRATION
mode.
Calibration
Содержание Druck DPI 610
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