Honeywell HPM, Service

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R688 HPM High-Performance Process Manager Service 435
December 2020 Honeywell
7. IOP Calibration Procedures
7.1 Overview
Introduction
This section describes the calibration procedures used to calibrate the High-Performance Process
Manager’s (HPM’s) IOPs.
SHOCK HAZARD
Troubleshooting, opening this equipment and removing any panels or covers will expose the
user to the risk of a shock hazard. There are no user serviceable parts inside this equipment.
Refer all servicing only to qualified service personnel .
Calibration may require more than one switch to deenergize units before calibration.
No manual adjustments
There are no manual adjustments, such as Power Supply Module settings in the HPM. However, there
are some semiautomatic calibration procedures for the Low Level Analog Input (LLAI), High Level
Analog Input (HLAI), and Analog Output (AO) subsystems that may be required periodically.
CAUTION Do not attempt recalibration without the proper equipment and a working knowledge of
the equipment.
7.2 LLAI, HLAI, and AO IOP Calibration
Common Calibration Procedures
Each LLAI, AO, and HLAI subsystem maintains on-board calibration constants for each analog channel
that is stored in nonvolatile memory. Field calibration can probably be an annual event or more often
during a plant or unit shutdown, if necessary.
IOP or FTA substitution
Honeywell recommends that if possible, substitution be used when it is suspected that an IOP or FTA is
out of calibration, rather than recalibrate the IOP or FTA in an on-line HPM.