Detcon DM-634 - Manual (Page 13)

Programming Magnet Operating Instructions
Operator interface to MicroSafe™ gas detection products is via magnetic switches located behind the transmitter
face plate. DO NOT remove the glass lens cover to calibrate or change programming parameters. Two switches
labeled “PGM 1” and “PGM 2” allow for complete calibration and alarm level programming without removing the
enclosure cover, thereby eliminating the need for area de-classif ication or the use of hot permits.
A magnetic programming tool (see f igure 6) is used to operate the switches. Switch action is def ined as momen-
tary contact, 3 second hold, and 30 second hold. In momentary contact use, the programming magnet is waved
over a switch location. In 3 second hold, the programming magnet is held in place over a switch location for 3 or
more seconds. In 30 second hold, the programming magnet is held in place over a switch location for 30 or more
seconds. Three and thirty second hold is used to enter or exit calibration and program menus while momentary
contact is used to make adjustments. The location of “PGM 1” and “PGM 2” are shown in f igure 7.
NOTE: If, after entering the calibration or program menus, there is no interaction with the menu items for
more than 30 seconds, the sensor will return to its normal operating condition.
3.7.2 Calibration Procedure - Span
NOTE : Before performing an ambiennt air O2 span calibration, be sure there is no oxygen-deficient condition
present.
CAUTION: Verif ication of the correct calibration gas level setting and calibration span gas concentration is
required before “span” calibration. These two numbers must be equal.
Calibration consists of entering the calibration function and following the menu-displayed instructions. The display
will ask for the application of span gas in a specif ic concentration. This concentration must be equal to the calibra-
tion gas level setting. The factory default setting for span gas concentration is 20.9% O2 which is the normal
atmospheric concentration. Other concentrations may be used as long as they fall within 15.0% to 25.0% O2.
However, any alternate span gas concentration value must be programmed via the calibration gas level menu before
proceeding with span calibration. Follow the instructions below for span calibration.
a) Verify the current calibration gas level setting as indicated by the programming status menu. To do this, follow
the instructions in section 3.8 and make note of the setting found in listing number 12. The item appears as
“CalGas @ xx.x %”.
b) If the calibration gas level setting is equal to your calibration span gas concentration, proceed to item “f”. If
not, adjust the calibration gas level setting so that it is equal to your calibration span gas concentration, as
instructed in items “c” through “e”.
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.
Detcon Model DM-634 Oxygen Sensor PG.13
Magnetic Programming Tool
Figure #6