Ground Water

CTD (Conductivity, Temperature & Depth) Sensors

CTD Sensors are primarily used for detection of changes occurred in conductivity, salinity, TDS (Total Dissolved Solids), temperature and depth. Conductivity, Salinity and TDS are measured by one sensor. Salinity is defined as the presence of salt and other seawater compounds in the water. Conductivity is traditionally defined as “the ability of passing electric current”. Salinity and Conductivity combined are used as the parameter for checking the water condition in water log area, for Irrigation purposes. Depth of water is also the measure of the water login ability of the underground water. So CTD sensors play a vital role in determining the present condition of Irrigation system, Land, Water Qality and can be useful for Irrigation, Agriculture, Water Quality Control, Pesticide, Construction companies & departments and Farmers.

What is it and why do we use it?

A CTD — an acronym for Conductivity, Temperature, and Depth — is the primary tool for determining essential physical properties of sea water. It gives a precise and comprehensive charting of the distribution and variation of water temperature, salinity, depth and density that helps to understand how the fresh, ground, salt and ocean water affect life.

How does it work?

The CTD is made up of a metal probe attached to a Data Logger via communication cable. The probe is lowered down to the ground water and user can observe the water properties in real time via a conducting cable connecting the modem in CTD logger. A remote GSM modem can receive the real-time values via cellular network. Interval for taking the reading is configurable via software locally and remotely.


  • Remote sensing
  • Very accurate
  • Light weight
  • Can be used at depths up to several hundred feet



CTD sensors has the wide variety of application such as Control Measurement in areas of potential pollution, e.g.

  • Environmental checks of groundwater and surface water.
  • Monitoring of saltwater intrusion.
  • Areas used intensively for agriculture.
  • Re-Cultivation of contaminated sites and devastated open-cast areas.
  • Ocean explorers often use CTD measurements to detect evidence of volcanoes, hydrothermal vents, and other deep-sea features that cause changes to the physical and chemical properties of seawater.



  • Robust & Long-Term Stability.
  • Large Memory Capacity.
  • Corrosion and Saltwater resistant material.
  • Minimal Maintenance.


CDigital has installed CTD Sensors at different locations. Some of them are:

  • CTD 1: Awami Canal Head
  • CTD 2: Mandi Sadiq Rest House
  • CTD 3: Dera Of Chaudary Fazil Ahmed Arain
  • CTD 4: Toba Balochan
  • CTD 5: Rest House Head Jaal Wala
  • CTD 6: Haroonabad Rest House
  • CTD 7: Fort Abbas Canal Rest House Shohbazwala
  • CTD 8: Walhar Canal Rest House
  • CTD 9: Qureshi Bangla Near Fort Abbas
  • CTD 10: Canal Rest House Near Fort Abbas