Honeywell SMV 3000 - Manual (Page 124)

112 SMV 3000 Transmitter User’s Manual 1/99
10.2 Overview
About Calibration Differential pressure and static pressure measurements can be affected by
conditions external to the transmitter, (such as process material or residue
adhering to barrier diaphragms for example), so measurement “drift”
cannot be eliminated completely. If recalibration of the differential
pressure PV1 and/or static pressure PV2 measurement range is required,
we recommend that you do a bench calibration with the transmitter
removed from the process and located in a controlled environment to get
the best accuracy.
For a transmitter with a small differential pressure span, a input zero
correct function should be performed. This action corrects for any minor
error that may occur after the transmitter is mounted and connected to the
process.
If the transmitter will be operating in the analog mode, you must calibrate
its output signal before you calibrate the transmitter’s measurement
ranges. While it is not required to calibrate the output signal first for
transmitter's operating in the DE mode, you can do it by reading the output
in percent.
You can reset the calibration data for any given measurement range to
default values, if it is corrupted, until the transmitter can be recalibrated.
See subsection 10.5 for details.
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