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Geolux HydroTempWater Temperature Sensor

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The Geolux HydroTemp sensor comes as a single sensor or a multi-sensor array version for immersion into the water or soil to measure temperature in a single or multiple depths. Both variants have standard RS-485 Modbus and SDI-12 interfaces for easy integration with Geolux and third-party dataloggers. It is possible to connect up to 16 sensors in the multi-depth configuration with customizable distance between the sensors. The HydroTemp sensor has a high accuracy of 0.1 °C and a resolution of 0.01 °C for temperatures ranging from -20 °C to +70 °C, and a fast temperature change response due to the aluminum enclosure.

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  • Scientific-grade accuracy
  • Measures water, liquid, or soil temperature
  • Single temperature sensor and multi-depth version with up to 16 sensors
  • Low power consumption
  • RS-485 Modbus, SDI-12, and RS-232 interface available on all instruments
  • River and channel temperature monitoring
  • Oceanographic multi-depth temperature measurement
  • Water temperature supervision for aqua culture farming
  • Ecology water temperature monitoring
  • Multi-depth temperature sensor perfect for thermoclime observation

General specifications

  • Sensor type Digital MEMS (meets ASTM E 1112 and ISO 80601-2-56) 
  • Measurement range -20 °C to +70 °C
  • Resolution 0.01 °C
  • Accuracy 0.1 °C in whole operating range
  • IP Rating IP68 
  • Enclosure Type Anodized aluminum
  • Enclosure Dimension Φ16.5 mm x H 90 mm
  • Communication Interface 1x RS-485 Modbus RTU, 1 x SDI-12

Electrical & Mechanical

  • Input Voltage 9 to 27 VDC
  • Power Consumption 0.15 W operational; 0.055 W standby
  • Maximal Current < 100 mA
  • Multi Depth Sensor Up to 16 sensors in single line
  • Maximum Water Depth 150 m
  • Enclosure Dimensions Φ16.5 x H 90 mm