Chapter 7 Maintenance; Replace Sensor Circuit Board; Chlorine Sensor - Emerson Rosemount FCL-01 Reference Manual

Reference Manual
00809-0100-3412
7 Maintenance
7.1

Replace sensor circuit board

The Rosemount 1056 transmitter used with the FCL requires little routine 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.
Sensor circuit boards are replaceable.
PN
24263-00
24266-00
WARNING
Electrical shock
Disconnect main power and relay contacts to separate power source before servicing.
To replace the board:
Procedure
1. Turn off power to the transmitter.
2. Loosen the four screws holding the front panel in place and let the front panel drop
3. Loosen the gland fitting and carefully push the sensor cable up through the fitting
4. Once you have access to the terminal strip, disconnect the sensor.
5. Unplug the sensor board from the main board.
6. Slide the replacement board partially into the board slot. Plug the sensor board into
7. Carefully pull the sensor cable through the gland fitting as you push the sensor
8. Close the front panel.
9. Turn on power.
7.2

Chlorine sensor

7.2.1 General
When used in clean water, the sensor requires little maintenance. Generally, the sensor
needs maintenance when the response becomes sluggish or noisy or when readings drift
following calibration.
Maintenance frequency is best determined by experience. For a sensor used in potable
water, you may need to clean the membrane on a monthly basis and replace the
Rosemount FCL 1056
down.
as you pull out the circuit board.
See Figure 2-2.
the main board and reattach the sensor wires.
board back into the enclosure.
Description
pH/ORP/ISE sensor board
Chlorine sensor board
Maintenance
October 2023
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