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14. Review the calibration result:
• COMPLETE—The sensor is calibrated and ready to measure samples. The slope and/or offset
values show on the display.
• FAIL—The calibration slope or offset is outside of accepted limits. Do the calibration again.
15. If the calibration result is complete, push confirm.
16. Remove the plug and valve to discard the calibration standard.
17. Discard the open ampule.
18. Discard the contents of the vial.
19. Connect the sample tubing to the sensor.
20. Start the flow of water to the sensor, then push confirm.
The output signal returns to the active state and the measured sample value shows on the
measure screen.
4.8 Enter the calibration offset and slope manually
As an alternative to the 2-point calibration procedure, manually enter the offset and slope values to
fine tune the factory calibration.
Note: Changes to SET SLOPE or SET OFFSET can result in large differences in the readings.
1. Select SENSOR SETUP > [select sensor] > CALIBRATION.
2. Select an option.
Option
Description
SET SLOPE
Enter a slope. Options: 0.01 to 9.99. Default: 1.00.
Note: PAH = (uncalibrated PAH x slope) + offset
SET OFFSET
Enter an offset. Options: -9999.0 to 9999.0 (default: 0).
Note: PAH = (uncalibrated PAH x slope) + offset.
Note: Calculate and enter the offset value before the slope value is identified and entered.
4.9 Show calibration information
1. Select SENSOR SETUP > [select sensor] > CALIBRATION > CAL DATA.
2. Select an option.
Option
Description
LAST CAL
Shows the date of the last calibration.
DATE
Note: The production date of the digital gateway shows until the 2-point calibration
procedure is done.
SLOPE
Shows the slope value from the last calibration (or the value entered manually).
Note: The slope value is 1.00 when the sensor is set to the factory calibration.
OFFSET
Shows the offset value from the last calibration (or the value entered manually).
Note: The offset value is 0.0 µg/L PAH when the sensor is set to the factory calibration.
4.10 Set to factory calibration
To set the sensor back to the factory calibration, select SENSOR SETUP > [select sensor] >
CALIBRATION > SET CAL DEFLT.
English 21
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