Page 98
Bottle Mode
6.6 Conductivity calibration
CAUTION
Potential puncture hazard! Contact with the exposed needle could cause serious
injury. Use extreme care when installing and removing the sample bottles.
Conductivity calibration ensures the accuracy of the conductivity values reported by the
PAT700 TOC analyzer. A conductivity calibration consists of verifying the conductivity
meter using a precision resistor. The cell constant is adjusted to the value of the
conductivity standard, and therefore is always within ±2%. If the new calibration is greater
than ±10% of the factory calibration or ±5% of the previous user calibration, the
calibration is unacceptable and a new calibration is required.
Note: Immediately upon completion of the test the bottles are backflushed and allowed to equilibrate
to ambient pressure. DO NOT ATTEMPT TO REMOVE THE BOTTLES UNTIL THE BACKFLUSH
AND PRESSURE EQUALIZATION IS COMPLETE.
1. Allow the conductivity calibration standard to warm to room temperature.
2. At the home screen, touch the << icon to open the sliding toolbar.
3. Touch the setup icon.
4. Touch the bottles icon, then touch the conductivity calibration tab.
5. Make sure a checkmark appears in the use calibration resistor checkbox. If a
checkmark is not present, touch the checkbox to enable use of the calibration
resistor.
6. Press the return icon to return to the setup dialog box, then touch the return icon
again to return to the home screen.
7. Touch the << icon to open the sliding toolbar, then touch the bottles icon in the
toolbar, or touch the bottles icon in the lower left corner of the screen.
8. Touch the run standards button in the bottle mode dialog box. See Figure 67,
page 88.
9. Touch the conductivity calibration button in the run standards dialog box. See
Figure 68, page 89.
10. The OASIS door will unlock for five seconds. If the door is not opened within five
seconds, the unlock icon can be used to unlock the door manually.
11. Install the standards bottle following the instructions as shown in the load bottles
dialog box and ensuring that you place the standards bottle in the correct position.
See Figure 80. From left:
• Bottle 1 = empty
• Bottle 2 = 100 µS potassium chloride conductivity test standard
• Bottle 3 = empty
• Bottle 4 = empty
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