Hoffer Flow Controls HRT1, User Manual

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Appendix A – Default Configuration
41
HRT1 HP-313
7. MAINTENANCE
The only maintenance for the HRT1 is a possible battery replacement
after several years in service.
All configuration settings are stored in nonvolatile memory; therefore,
configuration settings will not be lost in the event of battery failure.
Lithium Battery Pack Replacement
WARNING: To prevent ignition of hazardous atmospheres, do
not remove the cover unless the area is void of combustible gas
and vapors. Replace the batteries only with battery part
number 100-2732 for Ex systems.
WARNING: The lithium battery that powers the HRT1 is a
sealed unit; however, should Lithium batteries develop a leak,
toxic fumes could escape upon opening the enclosure. Ensure
that the instrument is in a well-ventilated area before opening
the enclosure to avoid breathing fumes trapped inside the
enclosure. Exercise caution in handling and disposing of spent
or damaged batteries.
Important: Before replacing the lithium battery stop the flow
for at least two minutes prior to removing power from the unit
to ensure that the stored Grand Total is current when
restoring power. See Section 5.2 Saving Grand Total.
The lithium battery is secured inside the enclosure by a Velcro straps
and connected to a connector (JP2) near the top of the circuit assembly.
To replace a lithium battery pack in the HRT1, perform the following
steps:
Ex Proof Enclosure:
1. Loosen the cover set screw and unscrew the cover of the enclosure
counter-clockwise until it separates from the main body of the
enclosure.
2. Using a small standard blade screwdriver, remove the two #4-40
screws located to the lower right and upper left side of the LCD
display.