48 • Chapter 5: User Mode and Calibration HS-04 Operator’s Manual
5. Press and release POWER MODE.
6. The gas reading flashes and the bottom of the screen alternates between “APPLY” and “A-
CAL”.
NOTE: To back out of the gas application screen without performing the calibration,
press and release AIR and POWER MODE together.
7. Turn the regulator knob counterclockwise to open the regulator.
8. Allow the gas to flow for 1 minute.
9. Press and release POWER MODE.
H2S
0.0
A-CAL
ppm
H2S
APPLY
ppm
0.0
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