Detcon DM-634 - Manual (Page 19)

3.12 D ISPLAY C ONTRAST A DJUST
Detcon MicroSafe™ sensors feature a 16 character backlit liquid crystal display. Like most LCD, 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 declassif ication of the area is required.
To adjust the display contrast, remove the enclosure cover and use a jewelers screwdriver to turn the contrast
adjust screw located beneath the metallic face plate. The adjustment location is marked “CONTRAST”. See f igure 7
for location.
3.12A T ROUBLE S HOOTING
Memory or Error Reports
1. Re-initialize Sensor - Unplug transmitter and re-plug transmitter then swipe magnet over PGM 1 in the f irst 3 sec-
onds. This will clear the processor and recover from error state. Remember to put in all customer settings for range,
alarm and cal gas level after re-initialization.
Non-readable Display
1. If display has blue background when hot, install sunshade to reduce temperature.
2. If poor contrast, adjust contrast pot accordingly.
Nothing Displayed – Transmitter not Responding
1. Verify condulet has no accumulated water or abnormal corrosion.
2. Verify required DC power is applied to correct terminals.
3. Swap with a known-good transmitter to determine if transmitter is faulty.
Bad 4-20 mA Output or RS485 Output
1. Check that wiring is connected to correct terminal outputs.
2. Swap with a known-good transmitter to determine if transmitter is faulty.
3.13 S PARE P ARTS L IST
613-120000-700 Sensor splash guard
943-000006-132 Threaded Calibration Adapter for DM
500-001794-004 Connector board
327-000000-000 Programming Magnet
897-850800-000 3 port enclosure less cover
897-850700-000 Enclosure glass lens cover
960-202200-000 Condensation prevention packet (replace annually).
370-399100-000 Plug in replacement O2 sensor cell
926-345500-025 Plug in control circuit
399-200000-000 Stainless steel sensor housing assembly (does not include plug in sensor)
3.14 W ARRANTY
Detcon, Inc., as manufacturer, warrants each new plug-in O2 sensor cell (P/N 370-399100-000), for a two year peri-
od under the conditions described as follows: The warranty period begins on the date of shipment to the original
purchaser and ends two years thereafter. The sensor cell is warranted to be free from defects in material and work-
manship. Should the sensor cell fail to perform in accordance with published specif ications within the warranty
period, return the defective part to Detcon, Inc., 3200 A-1 Research Forest Dr., The Woodlands, Texas 77381, for
necessary repairs or replacement.
Detcon Model DM-634 Oxygen Sensor PG.19