Detcon FP-700 - Manual (Page 20)

Model FP-700
FP-700 Instruction Manual Rev. 3.0 Page 16 of 40
Zero Cal. . .Setting Zero. . . Zero Saved (each will scroll twice)
d) Remove the zero gas and calibration adapter, if applicable.
3.4.2 AutoSpan
The AutoSpan function is used to span calibrate the sensor. Span adjustment is recommended at 50% LEL.
NOTE: Before performing AutoSpan Calibration, verify that the AutoSpan level matches the
span calibration gas concentration as described in Section 3.5.3Set AutoSpan Level.
Material Requirements:
 Detcon PN 327-000000-000 MicroSafe™ 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
 Detcon PN 942-520124-050 50% LEL Methane in balance air (recommended for 0-100% LEL range)
or Detcon PN 942-520124-025 25% LEL Methane in balance air (recommended for 0-50% LEL
range) or other suitable span gas containing a certified level of % LEL concentration of combustible
gas in air balance. A flow fixed rate of 200-500cc/min is recommended.
NOTE 1: The span gas source must have a normal background concentration of 20.9% O2.
Pure Nitrogen background mixtures are not acceptable!
Significant span calibration
inaccuracies will result.
NOTE 2: If the span gas is different from the measured target gas, use the appropriate Cal
Factor as described in Section 3.5.4.
NOTE 3: If the target gas is other than methane, use the appropriate Gas Factor as described
in Section 3.5.4.
NOTE 4: 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
AutoSpan calibration.
CAUTION: Verification that the calibration gas level setting matches the calibration span gas
concentration is required before executing “AutoSpan” calibration. These two numbers must be equal.
AutoSpan consists of entering Calibration Mode 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 and recommendation for span gas concentration is
50% of the sensor’s range. If a span gas containing the recommended concentration is not available, other
concentrations may be used as long as they fall between 5% and 95% LEL (0-100% LEL range) or 2% and
50% LEL (0-50% LEL range). However, any alternate span gas concentration value must be programmed via
the “Set AutoSpan Level” menu before proceeding with AutoSpan calibration. Follow the instructions “a”
through “e” below for AutoSpan calibration.
a) Verify that the AutoSpan Level is equal to the calibration span gas concentration. (Refer to View Sensor
Status in Section 3.5.2.) If the AutoSpan Level is not equal to the calibration span gas concentration,
adjust the AutoSpan Level as instructed in Section 3.5.3Set AutoSpan Level.