Note: The above is the actual sequence that must be followed for any calibration (i.e. if you calibrate the CO
2
sensor, then the barometric sensor, pressure sensor and temperature sensor must be calibrated first and in that
order).
After selecting a sensor to calibrate, the details of the last calibration are displayed. This shows the
values recorded, and information about who performed the last calibration and when. The due date
of the next calibration is also shown. A report is created on completion of any new calibration. The
last 10 reports can be viewed by selecting the Calibration reports option in the calibration screen.
Calibration schedule
The following table shows the recommended sensor calibration intervals based on an average of
500 package analyses per week. This proposed schedule can be modified according to operating
conditions.
Sensor Interval Sensor Interval
Barometric pressure sensor 6 months O
2
sensor 2 - 3 months
Flow meter 6 months CO
2
sensor 6 months
Temperature sensor 6 months Pressure sensor 6 months
Barometric pressure sensor
1. Push New calibration. A calibration screen is displayed showing the current values measured by
the instrument.
2. Using a precision certified barometer, measure the barometric pressure in the location where the
instrument is used and compare with the current barometric pressure value displayed. If the
values are the same press Cancel, otherwise enter the new value in the New barometric value
box and press Validation to store the new setting.
Pressure sensor
1. Push New calibration. A calibration screen is displayed showing the current values measured by
the instrument.
2. Using a precision certified barometer, measure the barometric pressure in the location where the
instrument is being used. Provided a barometric pressure sensor calibration has recently been
performed this measurement should be the same as the value displayed in the Reference
pressure box. If this is the case press Enter, otherwise enter the measured barometric pressure
value in the Reference pressure box and press Enter.
3. Connect a precision certified pressure gauge (0-7 bar) to the gas out connection on the rear of
the instrument and measure the reference pressure. Enter this value in the Reference pressure
box and press Enter.
4. Press the Validation button at the bottom left of the screen to accept the new calibration and
complete the process.
Temperature sensor
1. Push New calibration. A calibration screen is displayed and the instrument measures two
temperature values and checks the stability of the measurements. Provided the measurements
are stable, you can choose to accept or reject the new values. Press Validation to store the new
setting.
Carbon dioxide sensor
A Verification option is also available for this sensor. The process is the same as a new calibration.
When verification is complete press the Ok button to exit. No report is produced for the verification
process. The CO
2
sensor is calibrated using pure CO
2
and air. CO
2
is supplied by the purge gas and
air is provided by an internal pump that takes air directly from the atmosphere.
16
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