TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Section 17: Nitrate6. Select Nitrate in the Parameters list. The sensor serial number(SN) and recent calibration information is displayed.10. In the next screen, select Run to begin the stabilization.6107. Select Calibrate.The Nitrate Calibration Wizard starts. A screen like this is displayed.8. Select the number of calibration points for this calibration, and theconcentration (ppm) of the calibration solution for each point.Cal point 1 is the solution the sensor is soaking in now, the lowestconcentration for a multi-point calibration. If doing a three-pointbithermal cal, choose cal point 3 to be the same as either cal point1 or cal point 2.9. Select Next to continue.987The display will continuously update as readings are taken andcompared against the stabilization criteria.• Status indicators:NOT TESTED is displayed until you begin the calibration byselecting Run.UNSTABLE indicates the sensor response does not meet thecriteria for a valid calibration point.NOMINAL indicates the sensor deviation meets early stabilizationcriteria.The Accept button becomes available when nominal stability isachieved. You may accept the early value, or wait for completestability. If you accept the early value, the calibration point willbe designated “USER SET” in the calibration report. (For moreon calibration reports, see “Calibration History” in Section 10.)STABLE is displayed when the readings have stabilized sufficientlyto take a valid calibration point. The calibration proceedsautomatically to the next screen.• Sensor Reading: The current sensor response in milliVolts.• Deviation: Change in sensor response between the last two readings.• Current temperature is also displayed11. If doing a single-point calibration, go to step 16.For a multi-point calibration, the Wizard returns to the screenshown at step 10 and waits for you to situate the probe in the nextcalibration solution and click Run.TROLL 9500 Operator’s Manual 1180095110 rev. 007 01/09