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Introduction
The CTD-Diver® is a compact, groundwater monitoring instrument for continuously measuring level,
temperature and electrical conductivity in groundwater, surface water, and industrial waters. The
data collected can be used to manage water resources, estimate hydraulic conductivity and other
aquifer conditions. Examples of applications are:
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monitor potable water recharge areas for water supply,
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monitor tailings ponds, dewatering activities and water supply levels of mines,
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general site investigations for construction, and
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contaminant plume monitoring on spill sites, remediation sites, chemical storage facilities,
landfill sites and hazardous waste storage sites.
The CTD-Diver is an easy-to-use datalogger featuring state-of-the-art electronics , a robust high
precision pressure sensor for long term accuracy and a platinum 4-electrode conductivity sensor. The
absolute pressure sensor requires minimal maintenance and re-calibration.
The CTD-Diver is a datalogger housed in a cylindrical casing with a suspension eye at the top. The
suspension eye can be unscrewed and is designed to install the CTD-Diver into the monitoring well.
The suspension eye also protects the optical connector. The electronics, sensors and battery are
installed maintenance-free into the casing. The CTD-Diver is not designed to be opened.
The name of the datalogger, the model number, the measurement range and the serial number are
identified on the side of the CTD-Diver. This information is etched using a laser and is consequently
chemically neutral and not erasable.
About this Manual
This manual contains information about Van Essen Instruments CTD-Diver with part number DI28x,
see section 2.5, an instrument designed to measure groundwater levels, temperature and electrical
conductivity.
This chapter contains a brief introduction to the CTD-
contains the technical specifications for the CTD-Diver as well as guidelines for Diver maintenance.
Chapter 3 covers the deployment of Divers. This includes programming the Diver with the Diver-Office
software. Subsequently, installation of Divers in monitoring wells and in surface water is discussed.
There are three appendices that describe the use of Divers at varying elevation, the Diver
communication protocol and a list of CTD-Diver accessories.
Operating Principle
The CTD-Diver is a datalogger designed to measure water pressure, temperature and conductivity.
Measurements are subsequently stored in the CTD-Diver's internal memory. The CTD-Diver consists of
a pressure sensor designed to measure water pressure, a temperature sensor, a 4-electrode
conductivity sensor and a battery that powers the electronics that takes and stores the
measurements. The CTD-Diver is an autonomous datalogger that can be programmed by the user. The
CTD-Diver has a completely sealed inert ceramic enclosure. The communication between CTD-Divers
and Laptops/field devices is based on optical communication.
The CTD-Diver measures the absolute pressure. This means that the pressure sensor not only
measures the water pressure, but also the air pressure pushing on the water surface. If the air
pressure varies, the measured water pressure will thus also vary, without varying the water level. The
Summary of Contents for CTD-Diver DI28 Series
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