TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Section 12: Conductivity10. In the next screen, select Run to begin the stabilization.11. The final screen shows the new cell constant (Kcell) calculated forthe selected range during the calibration process.1012The 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.• Temperature at the time of calibration is displayed for your information.• Sensor Reading: The current sensor response in ohms.• Sensor Deviation: Change in sensor response between the last tworeadings. This enables you to follow the progress of the stabilization,but deviation from the previous reading is not necessarily thebest indicator of stability as the software is looking at longer-termtrends.Typical cell constants:Low-range sensor 0.32 – 0.39High-range sensor 4.4 – 5.8The displayed cell constant may be edited.12. Select Finish to program the sensor with the displayed cell constant.TIP: You can look at the calibration report right aftercalibrating, or at any time. See “Calibration History” inSection 10 for details.The conductivity sensor is now calibrated and ready to use in therange for which it was calibrated.TIP: The calibration solution may be flushed down the drainwith running water, or saved in a separate container andused to rinse the sensors the next time you calibrate with thesame solution.Options for storing sensors:• If the instrument will be used in a day or so, leave all the sensorsinstalled in the MP TROLL 9500. The conductivity sensor does notrequire any special storage conditions, but other sensors do. Referto the relevant sections of this manual for storage recommendationsfor other installed sensors.• Remove the conductivity sensor from the MP TROLL 9500, rinse it,and store it dry.TROLL 9500 Operator’s Manual 750095110 rev. 007 01/09