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9-3. Preparing for a Span Adjustment (Demand Flow Regulator)
This section describes how to prepare for calibration if you are using a calibration kit that includes:
•
Demand flow regulator
•
Calibration tubing
•
Methane calibration cylinder
•
Hydrogen calibration cylinder
1. Screw the demand flow regulator onto the calibration cylinder.
2. Connect the tubing to the demand flow regulator’s hose barb fitting.
9-4. Automatic Span Adjustment
These instructions describe an automatic calibration of the SP-220.
This version of the SP-220 must be
calibrated with both methane (CH4) and hydrogen (H2).
Be sure you have performed a fresh air
adjustment and prepared for calibration as described in the previous sections before continuing.
1 Prepare a methane gas
bag or methane
calibration cylinder as
described in the
previous sections.
2 If you have just
performed a fresh air
adjustment and the
instrument is still
running in Calibration
Mode, continue to step
6.
If your instrument is not
currently running in
Calibration Mode,
continue to step 3.
3 With the instrument
running in Detection
Mode, press and hold
the AIR and MODE
buttons for 3 seconds.
4 If the Calibration Mode
password parameter
has been set to on
(factory setting is off),
you will be prompted for
a password.
