© July 2023 Van Essen Instruments. All rights reserved.
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Introduction
The TD-Diver is a compact, groundwater monitoring instrument for continuously measuring level and
temperature 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,
•
monitor tailings ponds, dewatering activities and water supply levels of mines,
•
general site investigations for construction, and
•
contaminant plume monitoring on spill sites, remediation sites, chemical storage facilities,
landfill sites and hazardous waste storage sites.
The TD-Diver is an easy-to-use datalogger featuring state-of-the-art electronics and a robust high
precision pressure sensor for long term accuracy. The absolute pressure sensor requires minimal
maintenance and re-calibration.
The 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 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 Diver is not designed to be opened.
The name of the datalogger, the model number, the measurement range and the serial number are
clearly identified on the side of the 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 TD-Diver with part number DI8xx, see
section 2.5, and Baro-Diver® with part number DI800, an instrument designed to measure
groundwater levels and temperature and atmospheric pressure and temperature, respectively.
2 contains
the technical specifications for the TD-Diver and Baro-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 Diver accessories.
Operating Principle
The Diver is a datalogger designed to measure water pressure and temperature. Measurements are
subsequently stored in the Diver's internal memory. The Diver consists of a pressure sensor designed
to measure water pressure, a temperature sensor, and a battery that powers the electronics that takes
and stores the measurements. The Diver is an autonomous datalogger that can be programmed by
the user. The Diver has a completely sealed enclosure. The communication between Divers and
Laptops/field devices is based on optical communication.
The 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 air pressure can be
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