HS-04 Operator’s Manual Chapter 5: User Mode and Calibration • 47
2. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed
flow regulator onto the calibration cylinder.
3. Install the calibration cup onto the HS-04. Be sure the calibration cup is installed in the correct
direction and that it is pushed on all the way.
4. Use the tubing to connect the regulator to the inlet of the calibration cup (labeled “IN”).
Performing a Span Adjustment
1. While in User Mode, press AIR to scroll to GAS CAL.
2. Press and release POWER MODE. The AIR item appears.
3. Use AIR to scroll to the A-CAL item.
4. Press and release POWER MODE. The display shows the calibration value (see page 53 if the
calibration value does not match the calibration gas cylinder’s concentration).
POWER
MODE
AIR
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