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Internal Lithium Backup Battery
A lithium battery maintains the memory contents and
Setup settings. The normal service life for the lithium
battery is 3 to 5 years.
You cannot access the lithium battery. Return the
calibrator to an authorized Fluke service center if you
need to replace the lithium battery. When the lithium
battery is 3 years old, replace it at the next
calibration interval as a preventive maintenance
procedure.
Cleaning the Calibrator
Clean the calibrator and pressure modules with a
soft cloth dampened with water or water and mild
soap.
Caution
To avoid damaging the plastic lens and
case, do not use solvents or abrasive
cleansers.
Documenting Process Calibrator
Calibration Data
The date the calibrator was last calibrated shows on
the calibration sticker and on the last screen in Setup
mode. The CAL. STATUS number on the sticker
should always match the Calibration Status number
in the calibration
screen. Calibration of the
741B and 743B is to be done by qualified personnel.
Refer to the 74X Series Calibration Manual (PN
602505).
In Case of Difficulty
If the calibrator operates abnormally, do not use it.
Protection may be impaired. When in doubt, have the
calibrator serviced.
If the display is blank or unreadable, but the beeper
works when you turn the calibrator on, make sure the
contrast is not maladjusted. Press the
keys to adjust the contrast.
Maintenance
and
97
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