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Xi Advanced Electronics
4-14
Instruction Manual
IM-106-910Xi, Original Issue
November 2010
CALIBRATION -
GENERAL
New O
2
cells may operate for more than a year without requiring calibration,
but older cells may require recalibration every few weeks as they near the end
of their life.
A
CALIBRATION RECOMMENDED
alarm provides notice of when a calibration
is required. This strategy ensures that the O
2
reading is always accurate and
eliminates many unnecessary calibrations based on calendar days or weeks
since previous calibration.
The O
2
Probe(s) can be calibrated manually through the handheld 375/475
Field Communicator or the Xi. Fully automatic calibration can be performed
automatically using the Xi and the SPS 4001B Single Probe Autocalibration
Sequencer or the IMPS 4000 Intelligent Multiprobe Sequencer.
O
2
CALIBRATION
This section covers manual calibration. For automatic calibration details see
the Instruction Manual for the SPS 4001B Single Probe Autocalibration
Sequencer or the IMPS 4000 Intelligent Multiprobe Test Gas Sequencer.
Calibration can be performed using three basic calibration methods. The
methods available to you for use depend on the configuration of your system.
The paragraphs that follow describe how to perform a calibration for three
basic system configurations shown in Figure 4-5.
Included in the calibration procedures are instructions for setting up the cali-
bration parameters. Setup of the calibration parameters should be performed
before the first O
2
calibration. Thereafter, perform calibration setup only as
needed to change the calibration parameters or to reset the parameters fol-
lowing the replacement of primary system components.
Before calibrating verify that the configuration gas parameters are correct.
Refer to Section 3: Configuration of Xi Electronics.
Figure 4-5. Calibration Methods,
Simplified
O
2
Calibration with Xi
For systems with configuration 1, shown in Figure 4-5, use the following pro-
cedure to perform a calibration using the Xi. If necessary, use the Xi menu
tree in Figure 4-2 for reference.