Detcon DM-534C - Manual (Page 18)

DM-534C Oxygen Sensor Assembly
DM-534C O2 Sensor Instruction Manual Rev.1.4 Page 14 of 18
Detcon MicroSafe™ sensors are programmed for failsafe operation. Any of the following fault condition will
illuminate the fault LED, and cause the display to read its corresponding fault condition: “SENSOR FAULT”,
or “CAL FAULT”. A “Sensor Fault” will also cause the mA output to drop to zero (0) mA.
Sensor Life
The sensor life feature is a reference based on signal output from the sensor cell. When a sensor life of 25% or
less remains; the sensor cell should be replaced within a reasonable maintenance schedule.
8.7 Display Contrast Adjust
Detcon MicroSafe™ sensors feature a 16-character backlit liquid crystal display. Like most LCDs, character
contrast can be affected by viewing angle and temperature. Temperature compensation circuitry included in
the MicroSafe™ design will compensate for this characteristic; however temperature extremes may still cause
a shift in the contrast. Display contrast can be adjusted by the user if necessary. However, changing the
contrast requires that the sensor housing be opened, thus declassification of the area is required.
To adjust the display contrast, remove the enclosure cover and use a jeweler’s screwdriver to turn the contrast
adjust screw located beneath the metallic face plate. The adjustment location is marked “CONTRAST”. See
Figure 2 for location.