User manual

MC-III™ EXP Flow Analyzer Section 6

5. Install the new shrink-wrapped battery pack in the same position as the original battery pack as shown in

Figure 6.4, page 94 and secure the Velcro strap to hold the pack tightly in place.

6. Connect the replacement battery pack to the J1 connector.

7. Place the circuit assembly over the standoffs and fasten with the two #4-40 × 7/8” screws, ensuring that

all connector wiring is inside the enclosure.

8. Replace the enclosure cover, threading it onto the enclosure in a clockwise direction.

Important: The interruption of power to the MC-III EXP will cause the internal clock time to be inac-

curate. Reset the time via the interactive software. See Time/Date Synchronization, page 60.

Circuit Assembly Replacement

WARNING: To prevent ignition of hazardous atmospheres, do not remove the cover while

circuits are alive. Under normal conditions, the MC-III EXP poses no hazard when opened in a

safe area.

Important: Static electricity can damage a circuit board. Handle new boards only by their edges,

and use proper anti-static techniques (such as wearing anti-static wrist strap or touching

metal to establish an earth ground) prior to handling a board.

Important: If possible, record the accumulated total and all conguration settings before replacing

the circuit board. This information can be recorded by hand or captured by saving a con-

guration le that can be reloaded into the unit after the circuit board is replaced. (See

Saving and Uploading Conguration Files, page 75)

To replace the circuit assembly, 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.

3. Lift the display/keypad assembly from the enclosure.

4. Record the locations of all cable connections to the circuit assembly.

5. Using a small standard blade screwdriver, remove all wiring from terminal blocks TB1, TB2, and TB3,

and J2, ensuring that all wiring that is connected to powered circuits is insulated with tape.

6. Unplug the battery cable from connector J1 on the circuit assembly.

7. Remove the two #4-40 × 5/16” screws fastening the circuit assembly to the keypad assembly (Figure 6.5,

page 96.