TROLL 9500 Operator's Manual - Geotech Environmental Equipment

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Section 14: orpRecommended Calibration Order for pH and ORPThe pH/ORP sensor requires separate calibrations for pH and ORP. Asuggested calibration scenario is as follows:A. First, Quick-Cal ORP (plus, optionally, other installed Basic sensors).For the procedure, see Section 3, Getting Started.B. Then, perform a 2- or 3-point Traditional pH calibration as describedin Section 11 of this manual.Traditional ORP Calibration Procedure8. In the ORP Calibration Wizard, select the solution the sensor issoaking in. For ZoBell’s, the reference milliVolt value is availablein the software. For a custom solution, select “Other” and enter themV of the solution at the calibration temperature.8If you wish to perform a traditional calibration with a dedicated ORPcalibration solution, use the following procedure.1. With a pH/ORP sensor installed and plugs or sensors in the otherports, rinse the front end of the MP TROLL 9500 inclean water. For best results, rinse again in a portionof the calibration solution.2. Fill the Cal Cup with ZoBell’s or other custom ORPcalibration solution.3. Attach the Cal Cup to the MP TROLL 9500. Threadthe Cal Cup onto the body until seated against theo-ring, then back off slightly to avoid overtightening.4. Connect the MP TROLL 9500 to a PC and establish aconnection in Win-Situ 4 or Pocket-Situ 4.39. Select Next to continue.10. In the next screen, select Run to begin the stabilization.The display will continuously update as readings are taken andcompared against the stabilization criteria.95. Select the MP TROLL 9500 in the Navigation tree.The software will automatically detect and display theinstalled sensors. (This can take a moment.)6. Select ORP in the Parameters list. The sensor serialnumber (SN) and recent calibration information is displayed.67. Select Calibrate to launch the ORP Calibration Wizard.7• Status:Indicators during CalibrationNOT 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.• Temperature is displayed for your information.• 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 990095110 rev. 007 01/09
Section 14: orp11. The final screen shows the calculated sensor offset. This valueshould be 0 mV ± 20 mV.Sensor OffsetThe offset for ORP is a traditional “zero offset,” and is typically 0 ± 20mV. If the offset calculated during calibration is outside this range, inspectthe sensor. If it is clean, then the fault was probably with the calsolution (aging, exposure to air, etc.). In this case, resetting the factorydefaults for ORP can often restore the sensor performance.Units and Calculated MeasurementsORP readings may be displayed in Volts or milli Volts. No calculatedmeasurements are available.12. Select Finish to write this value to the sensor.The ORP sensor is now calibrated and ready to use.TIP: You can look at the calibration report right aftercalibrating, or at any time. See “Calibration History” inSection 10 for details.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.Options for storing sensors:• 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 the section on Sensor Care and Handlinglater in this chapter.Resetting Default CoefficientsThe sensor’s calibration may be reset back to factory defaults at anytime. This is a good option if the results of a recent calibration aresuspect because the cal solution has been exposed to air or hasotherwise deteriorated1. With a pH/ORP sensor installed, establish a connection to theinstrument in Win-Situ 4 or Pocket-Situ 4.2. Select ORP in the Parameters list and click Calibrate.3. In the first screen, select Use Default Coefficients, then Next.4. In the final screen, click Finish to send the values to the sensor.12Recommended Calibration FrequencyCalibration frequency will depend on the nature of the sample andthe degree of accuracy required. In clean water samples, the sensorcould retain its accuracy for 2-6 weeks. Recalibrate the sensor—• after replacing the reference junction and/or the filling solution,• during routine, scheduled maintenance,• every 2-6 weeks in the absence of other indications.Normalization to Standard HydrogenElectrode ValuesORP values are dependent on solution composition, temperature, andsensor type. ORP (Eh) values reported in the literature are often normalizedto the standard hydrogen electrode as a standard referenceelectrode. Since the standard hydrogen electrode is extremely fragile,it is impractical to use in the field. In-Situ’s sensor uses a silver/silver-chloridereference electrode in place of the standard hydrogen electrode.The following equation may be used to normalize the readings reportedby our sensor calibrated with our solution to standard hydrogenelectrode values (±50 mV).ORP SHE= ORP observed+ {215.81 – T C∗ [0.77942 + T C∗ 0.001934]}where ORP SHEis the sample potential relative to the standardhydrogen electrodeORP observedis the sample potential relative to the In-Situreference electrodeT Cis the sample temperature in °CORP measured by a sensor immersed in a solution should not beequated with thermodynamic Eh. Differences may occur due to lackof chemical equilibrium, presence of multiple redox couples, sensorpoisoning, and other factors.In addition, like all platinum ORP electrodes, In-Situ’s pH/ORP sensormay give unstable readings in solutions containing chromous, vanadous,titanous, and other ions that are stronger reducing agents thanhydrogen or platinum.TROLL 9500 Operator’s Manual 1000095110 rev. 007 01/09
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Multi-ParameterWater Quality TROLL
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ContentsCalibration ...............
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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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Section 2: Components & FeaturesCab
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Section 2: Components & FeaturesWat
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Section 2: Components & FeaturesPro
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Section 3: Getting StartedInstall t
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Section 3: Getting StartedEstablish
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Section 3: Getting StartedThe Quick
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Section 3: Getting StartedThe Wizar
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Section 4: Control SoftwareSoftware
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Section 4: Control SoftwareEditing
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Section 4: Control SoftwareChoosing
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Section 4: Control SoftwareExtracti
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Section 5: ProfilingThe profiler ca
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Section 5: ProfilingCustomizing the
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Section 6: Logging DataWith a D.O.
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Section 6: Logging DataEVENT (conti
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Section 6: Logging DataStarting a M
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Section 6: Logging DataTransferring
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Section 6: Logging DataThe selected
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Page 62 and 63: Section 8: Monitoring TemperatureRo
Page 64 and 65: Section 9: Monitoring Barometric Pr
Page 66 and 67: Section 10: Monitoring Water Qualit
Page 74 and 75: Section 11: pHE ois related to the
Page 76 and 77: Section 11: pH5. Select the MP TROL
Page 78 and 79: Section 11: pH• pH readings in pu
Page 80 and 81: Section 12: ConductivityTypeOperati
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Page 84 and 85: Section 12: ConductivityTotal Disso
Page 86 and 87: Section 13: Dissolved Oxygen—Pola
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Page 104 and 105: Multi-ParameterWater Quality TROLL
Page 108 and 109: Section 14: orpUsage Recommendation
Page 110 and 111: Section 15: AmmoniumSensor Installa
Page 112 and 113: Section 15: AmmoniumThe Ammonium Ca
Page 114 and 115: Section 15: AmmoniumSensor Care and
Page 116 and 117: Section 16: Chloride2. Remove the s
Page 118 and 119: Section 16: Chloride10. In the next
Page 122 and 123: Section 17: Nitrate• Single-point
Page 124 and 125: Section 17: Nitrate12. Remove the C
Page 128 and 129: Section 18: TurbidityWiper Installa
Page 130 and 131: Section 18: TurbidityPolymer-based
Page 132 and 133: Section 18: TurbidityA screen simil
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Page 136 and 137: Section 19: SDI-12 OperationSensor
Page 138 and 139: Section 19: SDI-12 OperationSDI-12
Page 142 and 143: Section 20: Low-Flow MonitoringFlow
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Page 154 and 155: GlossaryHost PC: Desktop computer r
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GlossaryReading: Measurement from a
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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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