TROLL 9500 Operator's Manual - Geotech Environmental Equipment

Multi-ParameterWater Quality TROLL ®7 Monitoring Pressure (Water Level)Why Monitor Pressure?Water level or pressure head readings are taken for a number ofreasons. In aquifer characterization, this type of data will help the userdetermine important hydrologic parameters of an aquifer, includinghydraulic conductivity, transmissivity, permeability, storage coefficient,dispersivity, and porosity. Some or all of these parameters are importantin the design of wells and well fields for various purposes.In the design of a remediation system, the proper placement of wellsfor monitoring or extraction is of paramount importance if the systemis to function effectively. Accurate data from slug and pump testing isone of the primary tools employed for aquifer characterization in thedesign process.Step testing and constant-rate pump testing yield significant data indetermining proper pumping rates. Improper rates can lead to aquiferdepletion, salt water intrusion, and several other problems. Accuratedata in designing the system and monitoring the system is essentialfor long-term success of the well and the proper maintenance of theaquifer.The collection and use of water level measurements in the miningand coal bed methane industries are essential for the success ofthe mines and wells. Data derived from pilot testing of water wellsconstructed for coal bed methane extraction provide necessaryinformation on bottom-hole pressure and appropriate pumping ratesto accomplish the de-watering necessary to release the methane gas.Monitoring of water levels assures efficient production.Water level measurements ofsurface water by pressuremeasurements yield significantdata about the overall healthof the hydrologic cycle. Thisinformation is also useful to government, agriculture, and industry aswell as the scientific community when planning water use and whenadjudicating water rights issues.The Pressure SensorThe optional pressure sensor of the Multi-Parameter TROLL 9500, ifincluded, is permanently-installed and factory-calibrated. If your MPTROLL 9500 was ordered without a pressure or turbidity sensor, therewill be a permanently installed plug in the pressure sensor slot. Apressure sensor can be added at the factory.Pressure sensorDo not try to remove the pressure sensor or permanentlyinstalled plug.Factory CalibrationThe pressure sensor is calibrated across full pressure over a range of-5° to 50°C. The pressure reference is provided by a pressure controland measurement system (PCMS) that supplies a calibrated andcertified pressure to the pressure sensor. The temperature referenceis provided by a water bath with a thermal homogeneity of 0.0008°C and measured with calibrated and certified digital thermometers.The calibration process results in a data set of raw analog to digitalconversions (A/D readings) for both pressure and temperature fromthe device versus actual pressure and actual temperature from thecalibrated references.From a two-dimensional data set of temperatureA/D versus reference temperature,and a three-dimensional data set of pressureA/D versus temperature A/D and referencepressure, numerical coefficients are generatedto equations that map the MP TROLLperformance across all temperatures andpressures.TROLL 9500 Operator’s Manual 460095110 rev. 007 01/09