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Configuration, Startup and Operation 63
6
888Xi Advanced Electronics Instruction Manual Section 3: Configuration, Startup and Operation
PN 51-6888Xi December 2012
after the calibration completes, but the new slope and constant will not be implemented until
accepted. If the 6888XI has the diffuser warning function activated, a diffuser warning alarm may
occur after a calibration. If an alarm occurs, it will need to be acknowledged and the associated
parameters need to be reviewed to determine if there is any significant fouling of the diffuser.
O
2
Calibration with 6888Xi
For systems with configuration 1, shown in Figure 3-5, use the following procedure to perform a
calibration using the 6888Xi. If necessary, use the 6888Xi menu tree in Figure 3-2 for refer-
ence.Multiprobe Test Gas Sequencer.
1. Press the MENU button repeatedly until the IOB1 Probe 1 menu displays.
2. From the main menu, select CALIBRATION then press ENTER.
3. From the CALIBRATION menu, select O2 CALIBRATION then press ENTER.
4. In the first screen, a “Ctrl Loop to Manual” warning occurs. Remove the 6888XI from any
automatic controls loops to avoid a potentially dangerous operating condition. Press ENTER
when ready to start calibration.
5. Follow the prompts on the 6888XI display to perform the calibration.
6. The STOP GAS 2 step screen just prior to the purge step will display the calibration result. In
the event the calibration cycle fails, the reason will be displayed here as well. The calibration
results are described as follows:
Success – Calibration completed successfully.
Failed Constant – The calculated calibration constant is outside the range of ±20.00.
Failed Slope – The calculated calibration slope is outside the range of 34.5 to 57.5.
FIGURE 3-7. Calibration Methods, Simplified
WARNING
Failure to remove the 6888Xi from automatic control loops prior to performing this procedure may
result in a dangerous operating condition.