OX-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 OX-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.
GAS CAL
AIR
O2
20.9
AIR
%
