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62 Configuration, Startup and Operation
S
ection 3: Configuration, Startup and Operation 6888Xi Advanced Electronics Instruction Manual
December 2012 PN 51-6888Xi
Normal – Heater set point at 736°C
L
ow – Heater set point at 550°C
7. Use the stylus on the screen keypad to press ENTER when finished.
8. Use the stylus on the screen to select SEND to update the 6888Xi.
9. From the SENSOR menu, select HIGH TEMP ALM SP.
10. Use the stylus on the screen keypad to tenter the high temperature alarm set point value.
The value must be 750°C and 850°C. Press ENTER when finished.
11. Use the stylus on the screen to select SEND to update the 6888Xi
12. From the SENSOR menu, select HEATER LATCH OFF.
13. Press the RIGHT arrow key to edit the value. Use the UP and DOWN arrow keys to select the
mode.
No – Heater turns off above set point, then turns back on if process falls below set point
Yes – Heater turns off above set point, but does not then turn back on if process falls
below set point
14. Use the stylus on the screen keypad to press ENTER when finished.
15. Use the stylus on the screen to select SEND to update the 6888Xi.
3.8 Calibration
3.8.1 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 cali-
brations 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 6888Xi. Fully automatic calibration can be performed automatically using the 6888Xi and
the SPS 4001B Single Probe Autocalibration Sequencer or the IMPS 4000 Intelligent Multiprobe
Sequencer.
3.8.2 Calibration Procedure
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 two 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 the configurations shown in Figure 3-7.
Setup of the calibration parameters should be performed before the first O2 calibration.
Thereafter, perform calibration setup only as needed to change the calibration parameters or to
reset the parameters following the replacement of primary system components.
When performing a calibration, certain settings will cause specific actions to occur. If calibration
acknowledge is set to yes, each calibration will generate an alarm condition that requires the oper-
ator to decide whether or not to accept the new calibration. The 6888XI will continue to function