Pressure / Liquid Level, Temperature and Electrical Conductivity Sensor for LoRaWAN®

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The device DL-CTD10 enables remote monitoring of water level, temperature and electrical conductivity. Applications are water quality monitoring in open water, fill level of tanks, groundwater quality and level and various other applications. It measures the pressure at the sensor head relative to the pressure at the cable end. At the cable end near the logger, there is a white piece of porous Teflon vent which provides the reference for the pressure measurement. When the sensor head is placed under water, the relative pressure indicates the depth of the sensor head. In water, a relative pressure of 1 bar equals to a depth of approximately 10 m.
The electrical conductivity measurement is used for monitoring the ion concentration in water (salinity, concentration of pollutants).
The device also reports the temperature of the sensor head. The temperature reading is also used internally for temperature compensation.
Another feature is the freezing flag. The freezing flag indicates if the sensor has ever measured a temperature below 0°C. This information is useful because if water freezes in the sensor head, the pressure transducer can be permanently damaged by the formation of ice.
Sensor data are transmitted in real-time using LoRaWAN® radio technology. LoRaWAN® enables encrypted radio transmissions over long distances while consuming very little power. The user can obtain sensor data through Decentlab’s data storage and visualization system, or through the user's own infrastructure.

Visit www.decentlab.com for more information about Decentlab's data cloud service.


  • Level / depth and water quality in tanks for liquids
  • Groundwater and wells
  • Running or open water level and quality
  • Salinity and chloride monitoring
# End Device
# EU 863-870
# Industrial IoT
# Logistics
# US 902-928



  • Range: 0 … 10 mH₂O / 0 … 1 bar, relative
  • Resolution: 2mm
  • Accuracy: ±0.5% of full scale @ 20 °C


  • Range: -11 ... +49 °C, do not expose to freezing temperatures if sensor is in water
  • Resolution: 0.1 °C
  • Accuracy: max. ±1 °C


  • Range: 0 … 120 dS/m
  • Resolution: 0.001 dS/m
  • Accuracy: ±0.01 dS/m or ±10% (whichever is greater)

Technical details

  • LoRaWAN™ class A
  • 2 C alkaline batteries
  • 13.5 cm × 8.1 cm × 7 cm (not including sensor / cable)
  • 10 m cable
  • Reference DL-CTD10

Datasheet and decoder on www.decentlab.com/support

DL-CTD10's Distributors

Decentlab GmbH