Detcon DM-534C - Manual (Page 17)

DM-534C Oxygen Sensor Assembly
DM-534C O2 Sensor Instruction Manual Rev. 1.4 Page 13 of 18
g) From the calibration menu “2- SPAN” (section 8.1) proceed into the span adjust function by holding
the programming magnet stationary over “PGM 2” for 3 seconds until the display reads “APPLY
xx.x% O2” then withdraw the programming magnet. The x’s here indicating the gas concentration
requested.
h) Apply the calibration gas at a flow rate of 500 milliliters per minute. As the sensor signal changes, the
display will change to “SPAN xx.x%”. The “xx.x” part of the reading indicates the actual gas reading
which will increase or decrease until the sensor stabilizes. When the sensor signal is stable it will auto
span to the requested concentration and the display will change to “SPAN COMPLETE” for two
seconds and then “REMOVE GAS”. Remove the gas. As the signal level returns to ambient gas
conditions, the display will return to the normal operation menu, “20.9% O2”
8.5 Status of Programming and Sensor Life
The programming menu has a programming status listing that allows the operator to view the gas, range, and
software version number of the program, the calibration gas level setting, as well as the estimated remaining
sensor life.
The following procedure is used to view the programming status of the sensor:
a) First, enter the programming menu by holding the programming magnet stationary over “PGM 2” for
30 seconds until the display reads “VIEW PROG STATUS”, then withdraw the magnet. The menu
options are: View Program Status, and Set Cal Level.
b) Next, scroll to the “VIEW PROG STATUS” listing and then hold the programming magnet over
“PGM 1” for 3 seconds. The menu will then automatically scroll, at five second intervals, through the
following information before returning back to the “” listing.
1. The gas type, range of detection and software version number: The menu item appears as: “O2
0-25 VX.XXX” with the Xs indicating the current version of installed firmware.
2. The calibration gas level setting: The menu item appears as: “CalLevel @ xx.x%”.
3. The estimated remaining sensor life: The menu item appears as: “Sensor life 100%”.
c) Exit back to normal operations by holding the programming magnet over “PGM 2” for 3 seconds, or
automatically return to normal operation in 30 seconds.
8.6 Program Features
Detcon MicroSafe™ toxic gas sensors incorporate a comprehensive program to accommodate easy operator
interface and failsafe operation. Program features are detailed in this section. Each sensor is factory tested,
programmed, and calibrated prior to shipment.
Over Range
When the sensor detects gas greater than 25.0% O2, it will cause the display to flash “25% O2” on and off.
Sensor Fault
If either of the wires connecting the sensor cell to the connector board should fail and cause an open circuit,
the sensor will go into a fault condition. “SENSOR FAULT”
Calibration Fault
If during calibration the sensor circuitry is unable to attain the proper adjustment for zero or span, the sensor
will enter into the calibration fault mode and cause the display to alternate between the sensor’s current status
reading and the calibration fault screen which appears as: “CAL FAULT”
Fail-safe/Fault Supervision