CTD-Diver

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 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 (0-120 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.

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applications

• Aquifer storage and recovery projects
• Salinization projects
• Saltwater intrusion projects
• Discharge monitoring
• Monitoring landfill sites
• Monitoring groundwater and surface water

product details

Programming

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 48 000 measurements per parameter. For each measurement, the date, time, water level, temperature and conductivity are stored.

Readout

Data may be recovered using (1) an optical Reading Unit or (2) with the use of a Diver Data Cable (DDC) and a PocketPC or laptop. With the second method, 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 Diver-Office  software package. Diver-Office is easy to use and offers additional features such as a barometer wizard to compensate water level measurements for changes in air pressure. It 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, 50 and 100 m water column). All models have a conductivity measuring range of 0–120 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 10 years. All you have to do after readout is rinse and calibrate the conductivity sensor. This is easily done using the Diver-Office 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.