Groundwater level, temperature and conductivity (CTD) Sensors

The KELLER Series 36XW-CTD is a high-precision multiparameter probe for the simultaneous measurement of water level, temperature and electrical conductivity in groundwater and surface water applications.

Combining three key measurements within a compact 22 mm diameter stainless steel probe, the 36XW-CTD is particularly suited to long-term environmental monitoring, groundwater investigations and applications where changes in water level and conductivity need to be monitored together.

Digital communication via RS-485 enables integration with telemetry systems and data loggers, while the probe can be configured and monitored using KELLER software.

Key Features

• Simultaneous measurement of water level, temperature and conductivity

• High-accuracy pressure measurement

• Integrated Pt1000 temperature sensor

• Four selectable conductivity measurement ranges

• Automatic temperature compensation of conductivity measurements

• RS-485 digital communication

• Modbus RTU and KELLER bus protocol (36XW) and SDI-12 (36XiW)

• Compact 22 mm diameter for installation in monitoring wells

• Rugged stainless steel construction

• IP68 rated for continuous submersion

• Titanium and Hastelloy construction options available

• Designed for long-term environmental monitoring

Typical Applications

• Groundwater level and quality monitoring

• Surface water monitoring

• Salinity and saltwater intrusion monitoring

• Coastal and estuarine groundwater investigations

• Hydrogeological investigations

• Borehole and monitoring well installations

• Water abstraction monitoring

• Long-term environmental monitoring

• Telemetry and remote monitoring systems

• Groundwater research

• Estuarine, coastal and marine applications

• Surface water monitoring

• Conductivity profiling

• Borehole integrity assessments