Multi-Parameter System Monitors Conditions Year Round

Multi-parameter monitoring is becoming increasingly popular as a method for assessing year-round site conditions in both surface water and groundwater. Daily measurement of water level and basic water quality parameters fills the gaps between more extensive laboratory analyses conducted just a few times a year.

Multi-parameter monitoring is becoming increasingly popular as a method for assessing year-round site conditions in both surface water and groundwater. Daily measurement of water level and basic water quality parameters fills the gaps between more extensive laboratory analyses conducted just a few times a year.

One system designed to independently monitor for a variety of parameters is In-Situ Inc.s Multi-Parameter Troll 8000, a combination data logger/probe. It can simultaneously record pH, dissolved oxygen, temperature, water level/pressure, and conductivity or oxidation-reduction potential (ORP). With 208 kb of non-volatile memory, the battery-operated system store more than 100,000 data points.

"Using the Troll, the field scientist is able to gather data that provide a full picture of hydrogeochemical conditions throughout the year. In contrast, quarterly sampling may miss extremes, skewing interpretation of the data," said Kathleen Rittle, Marketing Analyst at In-Situ.

Popular uses of the datalogger/probe include long-term monitoring of water quality in springs, drinking water wells, reservoirs and other surface waters.

All of the probes components are contained within a 316 stainless steel housing. The housing, a choice of Teflon(r) or polyurethane cable, and non-reactive sensor materials allow deployment in most clean and contaminated waters without chemical interactions, adsorption, or corrosion. The instruments 1.75-inch diameter permits installation in most monitoring wells. Since no components remain on the ground surface, the entire monitoring system can be locked within the well, protecting it from vandalism and accidental damage.

During well purging, low-flow sampling, monitoring of piping water quality, and in applications where there is insufficient space to accommodate the unit within a well, In-Situs flow cell can be used to route water past the Trolls sensors. The seal between the Troll and the flow cell prevents oxygenation of the water prior to analysis, preserving the integrity of the sample.

The probes design allows water quality sensors to be replaced without use of tools. Similarly, with the patented Quick-Connect(tm) cable system, the cable can be replaced with cabling of a different length or material.

To calibrate and program the Troll, the user connects it to a personal computer or laptop. Win-Situ softwares pull-down menus guide the user through calibration, setting of water level reference values, and formatting of measurement schedules on linear, logarithmic, or event scales.

When downloading data, the user reconnects the Troll to a computer. Win-Situ tabulates data in report and graph formats, with the users choice of measurement units and graph settings. For those who prefer to prepare presentations in Microsoft Excel(r), Win-Situ features an automatic export function. Water level and time data can also be imported by industry-respected aquifer test analysis programs such as AQTESOLV for Windows(r).

The Multi-Parameter Troll is currently available in two configurations. One model accepts pH, dissolved oxygen, and conductivity sensors. The other accepts pH, dissolved oxygen, and oxidation-reduction potential sensors. Both are equipped with internal, factory-calibrated pressure and temperature sensors.

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