Model FT2 101364
5. Preventative Maintenance
Warning! Before attempting any maintenance, take the necessary safety precautions before removing the probe
from the duct (example: purge lines of toxic and/or explosive gas, depressurize, etc...)
Turn OFF input power before removing or installing a circuit board assembly from the enclosure.
5.1. Access to Electronics
After turning OFF the power, loosen the 4 captive screws from the cover plate to expose the circuit
boards. This should give access to the TS2 connector.
Caution needs to be exercised to not damage the cable connecting the LCD/Keypad board to the main
board.
5.2. Sensor Cleaning
Even though the sensor is insensitive to small amount of contamination, continued use in dirty
environments will necessitate periodic cleaning. Remove power before removing the unit from duct,
exposing the sensor elements. If they are visibly dirty, clean them with water or alcohol (ethanol)
using an artist’s brush until they appear clean again. Even though the sensor elements are rugged and
breakage resistant, avoid touching them with any solid object and use a light touch while cleaning
them.
5.3. Broken or Damaged Probe
If the sensor is broken or damaged, the probe and electronics must be returned to the factory.
A new sensor will be installed and calibrated. Refer to Section 6.2, Return Procedure.
5.4. Calibration
To insure continuing high accuracy of your Model FT2 Flow Meter, Fox Thermal Instruments Inc.
provides a full NIST traceable calibration. The minimum re-calibration interval is 2 years, unless
otherwise recommended by FOX.
5.5. Fuse Replacement (Standard and NFP version)
Warning! Turn input power OFF before removing or installing a circuit board assembly from
the enclosure and before removing or installing the fuse. Use only recommended fuse
replacements.
Verify the fuse is defective by measuring it with an Ohm Meter (Two replacement fuses are provided
with each unit).
To replace the fuse:
The fuse F1 is located on the edge of the main circuit board and can be removed by using a sharp
instrument or a small screwdriver (wrist watch type screwdriver).
Page 46 Fox Thermal Instruments, Inc., 399 Reservation Road, Marina, CA 93933
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