Detcon DM-600IS - Manual (Page 30)

DM-600IS
DM-600IS Instruction Manual Rev 1.5.9 Page 26 of 37
c) 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. At this point
you can scroll through the programming menu by momentarily waving the programming magnet over
“PGM 1” or “PGM 2”. The menu options are: View Program Status, Set Alarm 1 Level, Set Alarm 2
Level, and Set Cal Level.
d) From the programming menu scroll to the calibration level listing. The menu item appears as: “SET
CAL LEVEL”. Enter the menu by holding the programming magnet stationary over “PGM 1” for 3
seconds until the display reads “CalGas @ ##PPM”, then withdraw the magnet. Use the
programming magnet to make an adjustment to “PGM 1” to increase or “PGM 2” to decrease the
display reading until the reading is equal to the desired calibration span gas concentration. Exit to the
programming menu by holding the programming magnet over “PGM1” for 3 seconds.
e) Exit back to normal operation by holding the programming magnet over “PGM 2” for 3 seconds, or
automatically return to normal operation in 30 seconds.
f) From the calibration menu “1-ZERO 2-SPAN” (section 9.1-a) proceed into the span adjust function
by holding the programming magnet stationary over “PGM 2” for 3 seconds then withdraw the
programming magnet. At this point the display will ask for the application of the target gas and
concentration. The display reads “APPLY xxx PPM” The x’s here will indicate the actual
concentration requested.
g) Apply the calibration test gas at a flow rate of 500 milliliters per minute. As the sensor signal changes,
the display will change to “AutoSpan xxPPM”. The “xx” part of the reading indicates the actual gas
reading which will increase until the sensor stabilizes. When the sensor signal is stable it will auto
span to the correct ppm reading and the display will change to “SPAN COMPLETE” for 3 seconds,
then to “SENSOR LIFE: xxx%” and then “REMOVE GAS”. Remove the gas. When the signal
level has fallen below 10% of full scale, the display will return to the normal operating mode.
NOTE 1: If there is not a minimal response to the cal gas in the first minute, the sensor will
enter into the calibration fault mode which will cause the display to alternate between the
sensor’s current status reading and the calibration fault screen which appears as: “SPAN
FAULT #1” (see section 9.3).
NOTE 2: If during the auto-span function the sensor fails to meet a minimum signal stability
criteria, the sensor will enter the calibration fault mode which will cause the display to alternate
between the sensor’s current status reading and the calibration fault screen which appears as:
“SPAN FAULT #2” (see section 9.3).
9.3 Additional Notes
1. Upon entering the calibration menu, the 4-20 mA signal drops to 2 mA and is held at this level until
you return to normal operation.
2. 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 which may activate fault alarm functions (see section
12.0) and will cause the display to alternate between the sensor’s current status reading and the
reported calibration fault description. In these cases, the previous calibration points will remain in
memory. If this occurs you may attempt to recalibrate by entering the calibration menu as described in
section 9.1-a. If the sensor fails again, defer to technical trouble shooting (see section 16.0).