Specifications

14
Instruction 0019-9208
N
2
O Monitor 3010
WARNING! After resetting the monitor to its factory settings,
a zero calibration must now be performed per Section 3.7
before the monitor is used for testing purposes.
3.7 Zero Cal i bra tion
There are two methods available to perform a zero calibration:
• Clean Air (preferred method)
• Zero Gas (alternative method)
Note: Span gas calibration is not required. The monitor is
dig i tal ly cal i brat ed and has a linear curve relationship between
0 and 1,000 ppm N
2
O. The zero calibration operation will adjust
the calibration curve throughout its full reading range.
Follow these guidelines when calibrating:
• A calibration can be performed after the monitor’s initial 30 minute
warm-up period has expired. A calibration should not be per formed im-
me di ate ly after the mea sure ment of a high con cen tra tion of gas.
• A calibration should only be done in clean air prior to the monitor’s
initial use for the day, or after the unit has been switched OFF/ON. If
clean air is not available, zero the unit using zero gas.
WARNING! Never attempt a zero in the actual testing en vi -
ron ment. Zeroing in a contaminated environment can
cause erroneous gas readings.
WARNING! Do not perform a zero calibration if the air
temperature is below 60 °F (15 °C). Zeroing in cold air can
cause erroneous gas readings.
WARNING! Do not immediately perform a zero calibration
when the instrument has just been brought in from a hot or
cold en vi ron ment, such as a cold vehicle in the Winter. First
allow the in stru ment to stabilize at the temperature at which
mea sure ments are to be made before zeroing.
When using the monitor for . . .
• TWA readings – zero before starting each 8 hour measurement period
• Leak measurements – zero daily before initial use
• Background monitoring – zero when moving from place to place