SC-04
Chapter 5: User Mode and Calibration • 41
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 sensor, you must do a fresh air adjustment (
AIR CAL
) and a span
adjustment (
A-CAL
or
E-CAL
).
•
The SC-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.
6. To perform a fresh air adjustment, press and hold AIR until the screen prompts you to
release it.
GAS CAL
AIR
SO2
0.00
AIR
ppm
AIR
HOLD
AIR
RELEASE
