DM-634C Oxygen Sensor Assembly
DM-634C O2 Sensor Instruction Manual Rev. .066
Page 14 of 25
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.
Figure 11
Magnetic Programming Tool
3.7.1
Calibration Procedure - Span
NOTE
1: Before performing an ambient air O
2
span calibration, be sure there is no
oxygen deficient condition present.
CAUTION:
Verification 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 specific concentration. This concentration must be equal to
the calibration 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”
, and 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, and Set Cal Level.