TempVue 50 SDI-12 Digital Water Temperature Sensor
Rugged and Reliable
For years of scientific-grade water and soil temperature measurements
weather applications supported water applications supported energy applications supported gas flux and turbulence applications supported infrastructure applications supported soil applications supported


The TempVue™50 is a high-precision digital water and soil temperature sensor that extends the high performance of the TempVue product line into the water. The TempVue 50 is a rugged and reliable sensor that exceeds United States Geological Survey (USGS) Office of Surface Water (OSW) specifications. The sensor is also plug-and-play with the Aspen ecosystem of Internet of Things (IoT) edge devices.

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Benefits and Features

  • Submersible and watertight sensor and cable
  • Highly accurate silicon sensor providing reliable and stable measurements in all conditions
  • Strong anchor loop to pull through conduit or secure to weights
  • Calibration certificate provided
  • Simplified installation and programming with SDI-12 outputs
  • Calibration information stored within the sensor and automatically applied to raw values to eliminate the need for coefficient calculations
  • Intelligent, digital sensor offering less complex wiring and fewer data logger channels
  • Compatible with all SDI-12 data loggers


Technical Description

The TempVue 50 is a fully digital water temperature sensor that uses the latest silicon bandgap technology to provide the market's highest level of accuracy and repeatability. The all-digital design minimizes self-heating, reduces complexity, and can be used to measure scientific-grade temperatures in both water and soil. The measurement electronics are surge protected and environmentally sealed with a fully encapsulated Delrin™ housing to provide years of reliable measurements in all environments.


Sensor Description Digital silicon bandgap
Time Constant in Air 35 s (1 tau)
Measurement Interval > 15 s (recommended)
Temperature Range -40° to +60°C
Measurement Uncertainty 0.1°C (-10° to +60°C)
Temperature Resolution 0.01°C
Housing Material Acetal homopolymer (Delrin 500P)
Maximum Submergence 30 m (98.4 ft) depth
Recommended Recalibration Interval 1 y
Diameter 17 mm (0.67 in.)
Length 95 mm (3.74 in.)


Average Current 150 µA
Active Current < 3mA
Input Voltage 6 to 16 V


SDI-12 Version 1.4
SDI-12 Address 0 (default)


-NOTE- This device is capable of fitting through a standard 2.5 cm (1 in.) conduit with a 20.3 cm (8 in.) factory bend.
Jacket Material Watertight, UV-resistant, 1.1 mm (0.045 in.) polyurethane
Maximum Cable Length 150 m (492.1 ft)
Maximum Pull Strength (Load) 450 N (100 lb)
Maximum Weight Load 2.25 kg (4.96 lb)


Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.


Product Compatible Note

Additional Compatibility Information

The TempVue 50 is compatible with all current Campbell Scientific data loggers, Aspen IoT devices, and other SDI-12-compliant data loggers.

Resources and Links


TempVue 50 Program Example v.1 (1 KB) 22-01-2024

This program uses the R0! SDI-12 instruction to retrieve the temperature measurement. The program is written for a CR1000X, but programs for other data loggers will be similar.

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