Detcon DM-100 - Manual (Page 19)

Model DM-100
DM-100 Instruction Manual Rev. 3.3 Page 15 of 40
2. SET AUTO SPAN will scroll across the display to indicate entry into the routine.
3. When adjustments can be made, the display will scroll ADJUST AUTO SPAN. Swipe PGM2 to
adjust the AutoSpan Level up. Swipe PGM1 to adjust it down.
4. If no action is taken within 5 seconds, the display will scroll AUTO SPAN NOT SAVED to indicate
a value was not saved. The unit will then return to normal operation.
5. If changes are made, the display will reflect the adjustments.
6. A 2 second hold on PGM1 or PGM2 will save the level. The display will scroll AUTO SPAN
SAVED to indicate that the value was saved and the unit will return to normal operation.
7. If no hold is placed on PGM1 or PGM2, the level will revert to the previous value. The display will
scroll AUTO SPAN NOT SAVED to indicate that the value was not saved and the unit will return to
normal operation.
3.3 Calibration
Zero and span calibration should be performed on a routine basis (quarterly minimum) to ensure reliable
performance. If a sensor has been exposed to any de-sensitizing gases, or to very high over-range combustible
gas levels, re-calibration should be considered. Unless otherwise specified, span adjustment is recommended at
50% of the full scale range.
3.3.1 Zero Calibration
The zero calibration is used to zero the sensor. Zero calibration should be performed periodically or as
required. Zero calibration should be considered after periods of over-range target gas exposure. Local ambient
air can be used to zero calibrate a toxic gas sensor as long as it can be confirmed that it contains no target or
interference gases. If this cannot be confirmed then a zero air or N
2
cylinder should be used. Pure N
2
must be
used for zero calibration of the O
2
deficiency sensors.
Material Requirements:
 Detcon PN 327-000000-000 Programming Magnet
 Detcon PN 613-120000-700 700 Series Splash Guard with integral Cal Port and Calibration Wind
Guard (P/N 943-000000-000) -OR-
 Detcon PN 943-000006-132 Threaded Calibration Adapter - OR -
 Detcon PN 943-01747-T05 Teflon Calibration Adapter for highly reactive gases
 Detcon PN 942-001123-000 Zero Air cal gas (or use ambient air if no target gas is present).
 Detcon PN 942-640023-100 Nitrogen 99.99%
 DVM (if a loop powered display is not installed)
NOTE 1:
The zero gas source may be zero air or N
2
for toxic sensors, but must be pure N
2
(99.99%)
for O
2
deficiency sensors.
NOTE 2:
The Calibration Wind Guard must be used when the Splashguard Adapter with integral Cal
Port is used.
Failure to use the Calibration Wind Guard may result in an inaccurate
AutoZero calibration.
NOTE 3: The cover of the junction box will need to be removed if there is not a loop powered