EOAS Scientific Instruments

Hydrolab HL7 Sonde

Figure: HL7 Sonde in stream
Image HL7

Official Description

The HYDROLAB HL7 multi-parameter sonde offers a versatile, durable and practical solution to the day to day needs of monitoring programs for both simple and complex deployments. With a large sensor suite, it is able to thrive in demanding environmental conditions for long term continuous and profile monitoring.
The Hydrology well is due south of the middle of the EOAS building and is drilled 140ft deep. A portion of the well conduit at the water table is a screen that allows groundwater to flow freely through the well.


The HL7 sonde is suspended at 87 feet in the hydrology well outside EOAS building. It rests above a deep well temperature sensor and well pump.


Voltage = 12 VDC
Serial = RS232
Protocol = Modbus
Website = https://www.ott.com/products/water-quality-2/hydrolab-hl7-multiparameter-sonde-2338/