Sierra INNOVA-MASS 241-VTP - Manual (Page 64)

Series 24-HP Instruction Manual Chapter 4 Troubleshooting & Repair
IM-24-HP 4-9
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
pliers 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,
gently tap the terminal strip with the screw driver handle. This
will loosen the rubber sealing gasket on the other side of the
enclosure 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.
Pressure Sensor Replacement
1. For local mounted electronics, remove the electronics stack as
previously described. For remote mount electronics, remove
all wires and sensor connectors from the remote feedthrough
board in the junction box at the meter.
2. Loosen the three set screws at the center of the adapter be-
tween the meter and the enclosure.
3. Remove the top half of the adapter to expose the pressure
transducer.
4. Remove the transducer and replace it with the new one using
appropriate thread sealant.
Warning!
Before attempting
any flow meter re-
pair, verify that the
line is not pressu-
i d