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Model 5100-28-IT Combustible Gas Sensor Module
Page: 28
7.3 TRANSMITTER REPLACEMENT
The transmitter assembly should be replaced when it is determined that it is unreliable, noisy or cannot be
calibrated. This situation may occur due to age, corrosion or failed components.
To replace the transmitter assembly:
a. Confirm that system power has been removed.
b. Remove the cover of the main enclosure.
c. Unscrew the two thumb screws in the top of the cover plate, lift the assembly and rotate 90o to relieve the
wiring service loop.
d. Unplug the sensor connector from the transmitter assembly.
e. Plug connector into new transmitter (be sure to match numbers between connector and socket).
f. Restore power and allow a minimum of 3 hours for stabilization before re-calibration.
7.4 SENSOR REPLACEMENT
The gas sensor which is located inside the sensor assembly housing can be replaced without replacement of
the housing. The gas sensor needs replacement when:
The “CAL-FAIL” message appears after calibration.
The sensor output signal is noisy, causing erroneous gas level readings.
The “Fail 002” message displays.
The “Enable 4-20mA Yes No” banner appears during start-up.
To replace the sensor assembly:
a. Confirm that system power has been removed.
b. Remove the gas sensor module enclosure cover.
c. Unscrew the two thumb screws in the top of the faceplate, lift the transmitter assembly and rotate 90o to
relieve the wiring service loop.
d. Unplug the sensor connector from the transmitter.
e. Unscrew the old sensor assembly from the enclosure conduit hub. Remove the sensor assembly with its
harness.
f. Install new sensor assembly into conduit hub.
g. Install ferrite noise filter on sensor wire.
h. Allow the new sensor to stabilize for a minimum of 4 hours and then calibrate using the procedure in
Section 6.
7.5 INSTALLATION INSPECTION
Prior to system start-up or trouble shooting the entire system should be visually inspected. The following are
guidelines for that inspection:
7.5.1 CONTROLLER INSTALLATION
Controller installed in conformance to instruction manual recommendations.
AC power is correctly grounded.
Hot AC and relay connections have safety covers installed.
7.5.2 SENSOR MODULE INSTALLATION
Module installation in conformance with this manual.
Modules accessible for calibration.
Wiring terminations clean and correct.
7.5.3 MOISTURE TRAPS AND RAINSHIELDS
Conduit seals and drains installed to avoid moisture build up in electronics enclosure. Water
accumulation in sensor module enclosures is a major cause of damage and system failures - take
precautions to seal electrical conduits and provide moisture traps and drains to avoid water damage
Rain-shields installed where applicable.
7.5.4 STANDARD VOLTAGES
Regulated DC Voltage to be applied to the sensor module must be between 10 VDC and 30 VDC.
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