Groundwater Monitoring Instrumentation Product CTD-Diver CTD-Diver is an accurate, multi-parameter groundwater datalogger instrument.
The CTD-Diver multi-parameter groundwater monitoring instrument is constructed with a durable ceramic casing making it impervious to potentially corrosive substances that may be found in some groundwater environments.
"We rely on the divers to provide water levels in remote areas for long periods of time" - Joseph Abbott, Hydrogeologist
Groundwater quality recording
Frequent monitoring of soil and groundwater quality is traditionally a labour-intensive job. This is also the case if saltwater intrusion or pollution at remediation sites needs to be monitored.
The new CTD-Diver by Schlumberger Water Services now sets the standard for reliability and longevity in groundwater quality monitoring. The CTD-Diver is a fully stand-alone datalogger with built-in memory, battery and sensors. Its ceramic casing and unparalleled conductivity measuring range (0-80 mS) make the CTD-Diver suitable for use at every measuring site.
The CTD-Diver is impervious to the most aggressive substances found in water environments. Its ceramic casing resists when even the strongest metals yield.
It is a highly reliable, compact datalogger for the simultaneous measuring of groundwater level, temperature and conductivity. These parameters are measured at time intervals predetermined by the user. The measured values are stored in the datalogger’s memory and can be read out at any given time.
CTD-Diver Benefits
Frequent, long-term measuring without human intervention
Reliable and accurate measurement data
Easy calibration
Specifications
Compact size, 22 mm [0.87 in] diameter and 183 mm [7.2 in] length for easy handling and installation
Three sensors in one sealed, corrosion-resistant ceramic housing
User-friendly software, including various export formats
Programming the CTD-Diver takes only a few minutes on your computer in the field or at the office. You can enter location, instrument code, start date and time, sample rate, sample method, and select conductivity range. If you select an event based sample method measured values are stored only if specified changed in conductivity occur. The CTD-Diver can start measuring at any time you specify.
Measuring
The CTD-Diver has three sensors: a pressure sensor to determine water level, a temperature sensor and a four-electrode sensor to determine conductivity. The internal memory can store up to 16 000 measurements per parameter. For each measurement, the date, time, water level, temperature and conductivity are stored.
Readout
Data may be recovered using an optical reading unti or with the use of a Direct Read Cable** (DRC) and a PocketPC or laptop you can readout the CTD-Diver without removing it from the monitoring well. Data can be retrieved from several CTD-Diver units, after which the files are transferred to a computer.
The CTD-Diver is supplied with the LoggerDataManager (LDM) software package. LDM is easy to use and offers additional features such as a barometer wizard to compensate water level measurements for changes in air pressure. LDM also includes a calibration wizard for quick and easy conductivity sensor calibration. The readout data is stored on your computer and can be exported in various formats to a spreadsheet program or database.
Models
The CTD-Diver i s available in three models with different pressure measuring ranges (10, 30 and 100 m water column). All models have a conductivity measuring range of 0–80 mS/cm and a ceramic casing which is practically damage- and corrosion-proof.
The installed CTD-Diver cannot be seen above ground level, which keeps the risk of vandalism to a minimum. Unlike many other systems, the CTD-Diver does not need a vented cable leading to the surface. The system is entirely closed and moisture penetration is impossible.
Depending on the use, the battery will last for approximately 8 years. All you have to do after readout is rinse and calibrate the conductivity sensor. This is easily done using the LDM software and standard calibration solution.
The CTD-Diver can be reinstalled in the monitoring well and resumes its work. A BaroDiver datalogger should be used simultaneously to measure variations in air pressure so that this can be compensated for when analysing the CTD-Diver data.
Schlumberger Water Services offers innovative groundwater monitoring solutions plus software for data management, data analysis, visualization, and modeling with a complete range of educational training and support services for environmental consultants, government agencies, industry, and educational/research institutions.
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