Maintenance | 112
Model FT3
Maintenance
PRECAUTIONS
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...
)
.
WARNING! EXPLOSION HAZARD. DO NOT REMOVE OR REPLACE COMPONENTS
OR FUSES UNLESS POWER HAS BEEN SWITCHED OFF WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
WARNING! EXPLOSION HAZARD. DO NOT DISCONNECT EQUIPMENT WHEN A
FLAMMABLE OR COMBUSTIBLE ATMOSPHERE IS PRESENT.
Access to Electronics
Accessing electronics is not normally required for maintenance purposes. If a loose connection is
suspected, unscrew the rear cap of the meter to access the wiring terminations.
CAUTION! BE SURE POWER TO METER IS SWITCHED OFF BEFORE ATTEMPTING TO
ACCESS ELECTRONICS. If there is a problem and a loose connection is not found, please
contact Fox Thermal Customer Service for technical assistance at (831) 384-4300.
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 "Returning Your Meter" on p. 136.
Flow Calibration and Calibration Validation
To ensure high accuracy of your model FT3 Flow Meter, Fox Thermal provides a full NIST traceable
calibration. It is recommended that the meter's accuracy be checked annually by performing the
CAL-V™ and Zero CAL-CHECK™ Calibration Validation tests.
Fuse Replacement
WARNING! Turn input power OFF before removing or installing a 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). Replacement fuse is Littelfuse part number 0454.750MR.
To replace the fuse:
The fuse F1 is located near the power terminal block and can be removed by using tweezers or
needle-nose pliers.
Sensor Cleaning
The sensor is insensitive to small amounts of residue, but continued use in dirty environments will
require periodic cleaning. To inspect the sensor, remove power from electronics and remove the unit
from the pipe or duct, exposing the sensor elements. If they are visibly dirty, clean them with water or
alcohol (ethanol) using an appropriate brush until they appear clean again. Even though the sensor
elements are rugged, avoid touching them with any solid object and use a light touch while cleaning
them.
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