TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Multi-ParameterWater Quality TROLL ®10 Monitoring Water Quality: OverviewWhy Monitor Water Quality?At a time of increasing demands on the finite natural resources of ourplanet, public organizations and private individuals alike have becomeacutely aware of the responsibility to maintain the quality of the earth’sair and water supplies.Recent rapid advances in knowledge and technology have made itpossible to deliver accurate, timely, and reliable data on processeswe cannot necessarily examine visually. New-generation sensors forin-situ measurement of surface waters and groundwater can be anefficient alternative to time- and labor-intensive programs of field samplingand transportation to a laboratory for analysis, or can supplementsuch programs. If it is possible to collect, interpret, and respondin a timely fashion to accurate information about water supplies andwater quality, we can design better systems for protection of thosesupplies.Monitoring water-quality parameters can reveal much about thepresence and movement of natural and unnatural components ofwater—the presence of harmful bacteria, potential pollution sources,depletion of nutrient requirements for aquatic life, salt-water intrusioninto fresh water bodies, changes in water level or temperature thatcan alert observers to the onset of an “event” that can adversely affectthe quality of the resource.Monitoring water quality in surface and groundwater resources maybe required by Federal, state, or local regulations. Digital records ofmonitoring can document compliance with guidelines and standardsmandated by regulatory bodies.Profiling and logging water-quality data can provide timely informationon continually changing conditions—profiling to provide instantaneousreal-time feedback, logging to track trends and demonstrate compliance.The SensorsThe Multi-Parameter TROLL 9500 takes advantage of new technologiesto monitor water-quality parameters in-situ with high accuracy.Each sensor has been manufactured to our rigid specifications and isdesigned to operate with the entire suite of sensors and with the MPTROLL 9500 electronics. These “smart” sensors retain serial numberidentification and calibration information, and are detected and identifiedby the instrument. A sensor may be calibrated in any MP TROLL9500 and moved to another port that accepts the sensor type, or usedin another MP TROLL 9500, without recalibration. The most accurateresults will be obtained when a sensor is calibrated and operated inthe same MP TROLL 9500.The water quality sensors available for the Multi-Parameter TROLL9500 may be classed in two general types:Basic Sensor Set• pH• Combination pH/ORP (Oxidation-Reduction Potential)• Dissolved Oxygen, polarographic (DO)• Conductivity (and Specific Conductance, Salinity, TotalDissolved Solids, Resistivity)The pH sensor is a Single ISEs (ion-selective electrode). The CombinationpH/ORP sensor is a Multiple ISE.The Basic sensors can be factory-calibrated and pre-installed in theMP TROLL 9500. They are ready for use right out of the box with abrief Quick Cal. However, for best results, if your software supportsit, we recommend that you perform a traditional two-point calibrationfor pH and DO, and a specific range calibration for conductivity asdescribed in sections 11-13 below. The accuracy that can be achievedfrom the instrument is proportional to the time and care you put intocalibration.TROLL 9500 Operator’s Manual 580095110 rev. 007 01/09