User manual
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MC-III™ EXP Flow Analyzer Section 6
Section 6 - MC-III EXP Maintenance
The MC-III™ EXP is designed to provide many years of service with minimal maintenance. Batteries require
periodic replacement, and battery life depends on whether battery power is the primary or secondary power
source.
All conguration settings are stored in nonvolatile memory; therefore, conguration settings will not be lost
in the event of battery failure.
The circuit assembly or keypad may also require replacement over the life of the instrument. Procedures are
provided in this section.
Lithium Battery Replacement
The MC-III EXP uses a lithium battery with a life expectancy of approximately 2 years. Due to the at
discharge characteristics of the lithium battery, it is difcult to determine how much life remains in a battery
at any given time. To preserve conguration and accumulated volume data, replace the battery at 2-year
intervals.
!
WARNING: CSA-APPROVED DEVICE. To prevent ignition of hazardous atmospheres, do not
remove the cover unless the area is void of combustible gas and vapors. Replace the battery
pack only with battery part number 9A-100005111.
!
WARNING: ATEX-APPROVED DEVICE. To prevent ignition of hazardous atmospheres, do not
remove the cover unless the area is void of combustible gas and vapors. Replace the battery
pack only with battery part number 9A-90099000.
!
WARNING: The lithium battery that powers the MC-III EXP is a sealed unit; however, should a
lithium battery 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. See additional information on lithium batteries in Appendix C, page C-1 of this
manual.
Important: Press the ENTER/SAVE key on the keypad before replacing the lithium battery to save
the accumulated total to nonvolatile memory. Once the battery is replaced and power is
restored to the unit, the last saved accumulated total will be displayed in the LCD.
The lithium battery is secured inside the enclosure by a velcro strap and connected to a connector (J1) near the
top of the circuit assembly.
To replace a lithium battery in the MC-III EXP, perform the following steps:
1. Unscrew the cover of the enclosure counter-clockwise until it separates from the main body of the enclo-
sure.
2. Using a small standard blade screwdriver, remove the two #4-40 × 7/8” screws located to the right and
left side of the display (Figure 6.1, page 92).