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8
Maintenance
8.1
Transmitter
The transmitter used with the Rosemount MCL requires little maintenance.
Clean the transmitter case and front panel by wiping with a clean soft cloth dampened
with water only. Do not use solvents, like alcohol, that might cause a buildup of static
charge.
The sensor circuit board (PN 24203-01) is replaceable.
To replace the board:
WARNING!
RISK OF ELECTRICAL SHOCK
Disconnect main power and relay contacts wired to separate power source before servicing.
Procedure
1.
2.
3.
4.
5.
6.
7.
8.
9.
8.2
Monochloramine sensor
8.2.1
General
When used in clean water, the monochloramine sensor requires little maintenance.
Generally, the sensor needs maintenance when the response becomes sluggish or noisy or
when readings drift following calibration. For a sensor used in potable water, expect to
Instruction Manual
Turn off power to the transmitter.
Loosen the four screws holding the front panel in place and let the front panel drop
down.
Loosen the gland fitting and carefully push the sensor cable up through the fitting as
you pull out the circuit board.
Once you have access to the terminal strip, disconnect the sensor.
Unplug the sensor board from the main board.
See
Figure
4-2.
Slide the replacement board partially into the board slot. Plug the sensor board into
the main board and reattach the sensor wires.
Carefully pull the sensor cable through the gland fitting as you push the sensor
board back into the enclosure. Tighten the cable glands.
Close the front panel.
Turn on power.
Maintenance
57
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Troubleshooting
