HS-04 Operator’s Manual Chapter 5: User Mode and Calibration • 45
Performing a Calibration (GAS CAL)
• Bump test the instrument before each day’s use with a known concentration of the target gas. A
bump test can be done in User Mode’s BUMP item or by applying gas in Measuring Mode.
The instrument does not need to be calibrated unless it does not pass the User Mode bump test
or does not respond appropriately, as defined by the user, in Measuring Mode.
• To fully calibrate the sensors, you must do a fresh air adjustment (AIR CAL) and a span
adjustment (A-CAL or E-CAL).
• The HS-04 can be calibrated using either A-CAL or E-CAL depending on the setting of the E-
CAL User Mode item.
• A-CAL (appears if E-CAL User Mode item is set to OFF): Apply gas for a period of time,
then press and release POWER MODE to perform the adjustment.
• E-CAL (appears if E-CAL User Mode item is set to something besides OFF): As soon as gas
is applied and the reading reaches 10% of the auto calibration value, the instrument counts
down from the number of seconds specified in the E-CAL User Mode item and automatically
performs the adjustment.
Performing a Fresh Air Adjustment (AIR)
1. Find a fresh air environment, an environment of normal oxygen content (20.9%) that is free of
toxic and combustible gases.
2. While in User Mode, press AIR to scroll to GAS CAL.
3. Press and release POWER MODE. The AIR item appears.
4. Press and release POWER MODE to enter the AIR menu.
5. To return to the AIR menu without performing a fresh air adjustment, press and release
POWER MODE.
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