sensors grouped by type and principle of operation

»Tensiometers
»Time domain reflectometry (or TDR)
»Hydrotek's Velocity Differentiation Domain (VDD).
»Capacitance (or FDR)
»Gypsum Blocks / Electrical Resistance
»Granular Matrix sensors , (Watermark sensors)
»Heat Dissipation
»Soil Conductivity sensors
»Dasgupta's voltammetric sensor.
»Psychrometry
»Neutron Probes
»Phase Transmission method (virrib sensor).
»SH3 supplied by "Measure Instruments" in Argentina.

»! N E W !
     Non-Contact infra red and microwave - suitable for surface layers

» Other technology

1. Acoustic methods

Relevant Links

• Richard Mead's great Trickle-irrigation list page on sensors

Campbell Scientific supports Sowacs

Data Logging Application and Measurement Systems Engineers


Soil Moisture Meter



Remote data acquisition and control systems


PRISM - CMP by Irrigation Scheduling Methods, Inc.

Research, Products, Consultancy on Real-Time Water Dynamics