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Series 24-HP Instruction Manual Chapter 4 Troubleshooting & Repair
IM-24-HP 4-9
nector on the temperature / pressure board. The current should
be approximately .0004 amps.
3. Go to the first column of the hidden diagnostics and record the
Pe(V) and Pv(V) values and consult the factory with findings.
Electronics Assembly Replacement (All Meters)
The electronics boards are electrostatically sensitive. Wear a
grounding wrist strap and make sure to observe proper handling
precautions required for static-sensitive components.
1. Turn off power to the unit.
2. Locate and loosen the small set screw which locks the larger
enclosure cover in place. Unscrew the cover to expose the elec-
tronics stack.
3. Locate the sensor harnesses which come up from the neck of
the flow meter and attaches to the circuit boards. Use small pli-
ers to pull the sensor wiring connectors off of the circuit
boards.
4. Locate and loosen the small set screw which locks the smaller
enclosure cover in place. Unscrew the cover to expose the field
wiring strip. Tag and remove the field wires.
5. Remove the screws that hold the black wiring label in place,
remove the label.
6. Locate the 4 Phillips head screws which are spaced at 90-
degrees around the terminal board. These screws hold the elec-
tronics stack in the enclosure. Loosen these screws (Note: that
these are captive screws, they will stay inside the enclosure).
7. Carefully remove the electronics stack from the opposite side
of the enclosure. If the electronics stack will not come out, gen-
tly tap the terminal strip with the screw driver handle. This will
loosen the rubber sealing gasket on the other side of the enclo-
sure wall. Be careful that the stack does not hang up on the
loose sensor harnesses.
8. Repeat steps 1 through 6 in reverse order to install the new
electronics stack.
Warning!
Before attempting
any flow meter re-
pair, verify that the
line is not pressur-
ized.