RKI Instruments NP-204 - Manual (Page 13)

NP-204 RKI Instruments, Inc.
B. Remove the two screws holding the U shaped bracket which secures
the TC sensor filaments into the sample chamber. Remove the bracket
and pull the sensor filaments from the chamber.
C. Install the replacement filaments into the chamber. Insure that the
filaments with the black and white wires are installed into the hole
closest to the corner of the instrument. Replace the U shaped bracket
and tighten its two screws securely.
D. Attach the three wires to the terminals on the circuit board, and
tighten the screw terminals securely. Insure that the color coded
wires go to the proper terminals, as indicated by the color wording
printed on the circuit board.
E. After sensor replacement, the instrument must be calibrated on a
known gas sample. Refer to the calibration section of this manual for
calibration instructions.
If sensor response is still too low, or is very slow, even after replacement of
sensor filaments, it may be necessary to clean or replace the flame arrestor
assembly.
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