TROLL 9500 Operator's Manual - Geotech Environmental Equipment

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Section 11: pH5. Select the MP TROLL 9500 in the Navigation tree.10. In the next screen, select Run to begin the stabilization.The software will automatically detect and display the installed sensors.If one or more sensors is installed in the wrong port, an errormessage will be displayed. Simply remove the sensor and install itin the correct position, then “refresh” the device before continuing.6. Click to select pH in the Parameters list. The sensor serial number(SN) and recent calibration information is displayed.1067. Select Calibrate to launch the pH Calibration Wizard. A screen likethis is displayed.7The display will continuously update as readings are taken andcompared against the stabilization criteria.11. If doing a one-point calibration, go to step 14.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.Indicators during Calibration• Status:8. Select the number of calibration points for this calibration, and thepH value of the calibration solution for each point. Cal point 1 isthe solution the sensor is soaking in now.9. Select Next to continue.98NOT TESTED is displayed until you begin the calibration by selectingRun.UNSTABLE indicates the sensor response does not meet the criteriafor 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 complete stability.If you accept the early value, the calibration point will be designated“USER SET” in the calibration report. (For more on calibration reports,see “Calibration History” in Section 10.)STABLE is displayed when the readings have stabilized sufficiently totake a valid calibration point. The calibration proceeds automatically tothe next screen.• Sensor Reading: The current sensor response in milliVolts.• 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 the bestindicator of stability as the software is looking at longer-term trends.TROLL 9500 Operator’s Manual 690095110 rev. 007 01/09
Section 11: pH12. Remove the Cal Cup, discard the first solution, rinse the Cal Cupand the front end of the instrument, refill the Cal Cup with thesecond solution, and attach it to the instrument.TIP: The calibration solution may be flushed down the drainwith running water, or saved in a separate container andused to rinse the next time you calibrate with the same solution.13. Select Run to begin the stabilization for the second calibrationpoint. Status indicators and controls are the same as for the firstcalibration point (step 10).For a 3-point calibration, repeat steps 12 and 13.14. The final screen shows the sensor slope and offset calculatedduring calibration. For a 3-point calibration, 2 sets of coefficientswill be shown.Resetting Default CoefficientsThe sensor’s calibration may be reset back to factory defaults at anytime. As the sensor ages, the coefficients calculated during calibrationwill deviate more and more from the nominal values, which arederived from new sensors. Default coefficients will give reasonableresults when the sensor is relatively new.1. With a pH or combination pH/ORP sensor installed, establish aconnection to the instrument in Win-Situ 4 or Pocket-Situ 4.2. Select pH in the Parameters list and click Calibrate.3. In the first screen, select Use Nominal Coefficients, then Next.4. In the final screen, click Finish to send the values to the sensor.Sensor Slope and OffsetThe pH calibration curve pivots around pH 7 (0 mV response). Theoffset calculated by the software when calibrating at pH 7 will typicallybe between 372-450 mV. If the offset falls much outside these limits,replace the filling solution or the junction (see the following page).The slope should fall between -54 mV/pH and -62 mV/pH. A calculatedslope greater than -50 mV/pH or less than -66 mV/pH indicatesthat the sensor requires maintenance (see the following page).15mV“Pivot pH” is the point at which the slope characteristics changewith a 3-point (2-range) calibration. The correct slope for the pHvalues being monitored will automatically be applied.15. Select Finish to program the sensor with the newly calculatedcalibration coefficients.TIP: You can look at the calibration report right aftercalibrating, or at any time. See “Calibration History” inSection 10 for details.Options for storing the sensor:• If the instrument will be used in a day or so, leave the sensorsinstalled. Remove the Cal Cup and rinse it and the sensors. Add50-100 mL of tap water to the Cal Cup. Return the probe to the CalCup for transport to the field site.• For longer storage, see Sensor Care and Handling, below.pHUnits and Calculated MeasurementsReadings from pH channel are displayed in pH units. No calculatedmeasurements are available.Usage Recommendations and Cautions• Temperature compensation is provided in the software to accountfor measurements taken at temperatures different from the calibrationtemperature. For most accurate results, try to calibrate at thesame temperature as the expected sample temperature.• A small error in pH will occur in basic solutions (>pH 10) thatcontain high levels of sodium salts (>0.01M) due to sodium interference.Contact In-Situ for more information.TROLL 9500 Operator’s Manual 700095110 rev. 007 01/09
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Multi-ParameterWater Quality TROLL
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ContentsSensor Care................
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Section 1: IntroductionConventionsT
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Section 1: IntroductionCleaning Gui
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Indexsaving data, 138setting unit p
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IndexTest Wizard, 35Text files, 45T
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Declaration of ConformityManufactur
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