TROLL 9500 Operator's Manual - Geotech Environmental Equipment

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Section 18: TurbidityPolymer-based standards are submicron, non-surface charged, solidspheres in matrixes of ultrapure water in homogeneous suspension;this homogeneity allows linear dilutions. EPA approved the polymersuspensions in 1984 as a calibration standard for turbidimeters.Polymer suspensions are very stable, can withstand temperatureextremes, and have excellent lot-to-lot precision. A range of polymersuspensions are available individually from In-Situ Inc. for calibratingany expected turbidity range. They can be diluted with turbidity-freewater to achieve other NTU values (but see the cautions below).Avoid vigorous mixing or agitation, which will create air bubbles andlower the accuracy of the standards. It is advantageous to calibrate anephelometric turbidimeter with a standard that most closely matchesthe size of the particulates you will be measuring.Calibrating with Other SolutionsFormazin: If you wish to recalibrate with Formazin, keep these pointsin mind.• Requires very careful handling.• Must be shaken gently and allowed to settle for at least 5 minutesbefore use.• Should not be diluted.Diluting Polymer Suspensions: If you dilute polymer suspensions,keep these points in mind:• Do not dilute more than 10:1. Use good laboratory techniques.• Store carefully. PVC bottles are recommended.• Diluting polymer suspensions takes them out of the category of“primary standards”, they become “secondary standards.”• If not handled carefully, the dilutions can become unstable; thesuspension of particles may be lost.Recommended Calibration FrequencyYour own experience is the best guide to how often the turbidity sensorwill benefit from recalibration. The need for recalibration dependson the condition of the optical windows, which in turn depends onthe environment. In a biologically active environment, cleaning andcalibration will be required more often. Periodic checks in calibrationsolutions of known turbidity can be beneficial in indicating how wellthe sensor is holding its calibration.A field calibration is recommended• if you wish to reference turbidity measurements to a standard otherthan polymer.• after cleaning the sensor windows of contamination.• when readings appear to drift, or show unexpectedly high or lowresults.* if algal or other growth on the front end of the MP TROLL 9500changes the reflective properties of the device.Turbidity Calibration ProcedureYou will need:• MP TROLL 9500 with turbidity sensor (wiper optional), plugs in anyunused sensor ports.• The restrictor, nose cone, and removable sensors (if any) that willbe installed when turbidity is measured.• A laboratory beaker large enough to hold the instrument and calibrationsolution.• One or more calibration standards for the region in which you wishto calibrate. Several ranges from Very Low to Full are suggested inthe Calibration Wizard.TIP: A 1-point to 4-point field calibration may be carried outin any range. When performing a multi-point calibration,begin with 0 NTU solution. For best measurement precisionthe highest NTU value should exceed the readings you expect in thefield.1. Rinse the front end of the MP TROLL 9500 with clean water. Shakewell to remove the rinse water; dry external surfaces (not the opticalwindows) with a clean tissue.2. Pour the selected calibration standard into the beaker and insertthe MP TROLL 9500 into the solution.The windows of the turbidity sensor should be immersed at least¼” (a quarter of an inch) deep in the solution. If no wiper is present,gently agitate the instrument to dispel any air bubbles.TROLL 9500 Operator’s Manual 1250095110 rev. 007 01/09
Section 18: Turbidity3. Connect the MP TROLL 9500 to a PC and establish a connectionin Win-Situ 4 or Pocket-Situ 4. Win-Situ screens are illustratedhere. The Pocket-Situ interface is similar, with the Navigation treeat the top of the screen and the Information pane below it.4. Select the MP TROLL 9500 in the Navigation tree.The installed sensors will be displayed—including the turbiditywiper, if installed in port P3.5. Click to select Turbidity in the Parameters list. The sensor serialnumber (S/N) and recent calibration information is displayed.• Single-Point Calibration. Click Next and go to step 12.• Standard Calibration (default).8. If you selected a Standard Calibration, select an operational rangetarget. The ranges are suggestions only; a 1- to 4-point calibrationmay be performed in any range, using any standardsNote: If the software detects a turbidity wiper accessory, pressingthe Wipe button will result in one complete wipe cycle of theturbidity sensor optics.9. Select Next to continue.10. In the next screen, select the number of calibration points for thiscalibration, and the turbidity value (in NTU) of the calibration solutionfor each point. One to four points (solutions) may be selectedfor any operational range target selected in the previous screen.51066. Select Calibrate.The Turbidity Calibration Wizard starts. A screen like the one belowis displayed.1178When performing a multi-point calibration, cal point 1 must betaken in a standard with a value of 0 NTU. Use clear water forthis. Purchased distilled or deionized water will generally measureless than 0.5 NTU. Filtered water will have a lower NTU value.11. Select Next to continue.97. Select the type of calibration you wish to do:• Use Default Coefficients resets the factory defaults. If you selectthis option, click Next and proceed to step 17.TROLL 9500 Operator’s Manual 1260095110 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 4: Control SoftwareSoftware
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Section 4: Control SoftwareEditing
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Section 4: Control SoftwareChoosing
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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 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 104 and 105: Multi-ParameterWater Quality TROLL
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Page 112 and 113: Section 15: AmmoniumThe Ammonium Ca
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Page 116 and 117: Section 16: Chloride2. Remove the s
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Page 136 and 137: Section 19: SDI-12 OperationSensor
Page 138 and 139: Section 19: SDI-12 OperationSDI-12
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Page 160 and 161: Indexsaving data, 138setting unit p
Page 162 and 163: IndexTest Wizard, 35Text files, 45T
Page 164: Declaration of ConformityManufactur
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