KCO-NO2 User’s Manual
90-0201-01
Kele • 3300 Brother Blvd. • Memphis, TN 38133
Page: 14
WWW.KELE.COM
Figure 11:
Sensor Module
Replacement.
6 Sensor Module Replacement
If there is an issue with the sensor module, the front panel LED will blink red. The 4-20 mA analog
signal will output 20 mA to indicate sensor malfunction to the apparatus monitoring the output.
When this occurs, the sensor module must be replaced.
6.1 Sensor Errors
The sensors are regularly tested to verify proper operation. If a sensor failure is detected:
1.
its front panel LED will blink red.
2.
the warning relay will be active.
3.
the alarm contact will remain inactive.
4.
the analog output will be forced to 20 mA to alert the device monitoring the analog reporting
output that the sensor has failed.
When front panel status LED is blinking red, the sensor is no longer operational and must be
replaced.
6.2 Replacement Sensors:
Calibrated sensor modules are available from Kele.
Carbon Monoxide (CO)
Nitrogen Dioxide (NO2)
Cal Kit
KMOD-CO
KMOD-NO2
6.3 Field Replacement of Sensor Modules
Sensor modules must be replaced when they reach their End of
Life.
To replace a sensor module:
1.
Open the controller’s front panel.
2.
Unplug the controllers power connector (refer to Figure
6).
3.
Unplug the failed sensor module by pulling the sensor
module firmly away from the main board (Figure 11).
4.
Plug the new sensor module into the vacant location:
press the module firmly until the nylon standoff
(highlighted in tan in Figure 11) at the bottom-left side
of the board has been seated properly.
5.
Plug in the controllers power connector.
6.
Observe that the front panel indicator is no longer flashing red, and then close the
controller’s enclosure.
