Soil Moisture Sensor PICO64
  • The sensible alternative to awkward neutron probes, complex cable testers or inaccurate capacitive sensors
  • Measurement of soil profiles in 18cm (T3) increments to a depth of 3 meters in any number of tubes
  • 0...60% vol soil water-content measurement

TRIME®-PICO IPH/T3 for accurate measurements of
soil moisture profiles

The intelligent and compact TRIME-PICO IPH/T3 sensor is a measurement devices for continuous and non-destructive determination of volumetric soil moisture. It is designed for mobile field use and can be connected to a PICO-BT Bluetoothmodule or a data logger (globeLog or any analogue data logger) or a PC for monitoring and data logging purposes.
IMKO was the first manufacturer of TDR measuring techniques to offer a TDR tube access probe especially designed for water content profiling. For the first time ever, the rapid, routine and non-destructive measurements of water content profiles is possible without the use of hazardous radioactive materials. The tube probe consists of a cylindrical PVC-body, which has four spring-mounted aluminium plates as TDR wave guides on opposite sides.

Soil Moisture Sensor TRIME-PICO IPH/T3 build in soil TRIME-PICO IPH/T3 build in soil

The measurements are performed from within TECANAT plastic access tubes which can be left in the soil. The tubes must be installed prior to the taking the measurements by using a specially developed drilling set. The system enables cable lengths of up to 25m. The intelligent, automatic TDR-curve reading electronics is housed in a robust and waterproof (IP-68) PVC-cylinder, withstanding even the toughest demands of permanent field use. The low power consumption of 8mA stand-by and 100mA during the 2..3-second measuring period conserves your power resources on site. Features are a RS485/V24 interface for both an external power supply (7V..24V/DC, 100mA) and connecting the PICO-BT Bluetoothmodule or a PC as well as an 0..1V or 0(4)..20mA analogue output for interfacing external devices e.g. datalogger.
The operating principle
The TRIME device generates a high-frequency pulse (up to 1GHz) which propagates along the metal shells, generating an electromagnetic field around the probe. At the end of the shells, the pulse is reflected back to its source. The resulting transit time (3ps...2ns!) can be measured and enabling determination of the propagation velocity, which is primarily dependent on the water content. The volumetric water content is then calculated by the velocity and is shown on the display panel immediately.

Measurement volume soil moisture sensor TRIME-PICO IPH/T3
Measurement volume TRIME-IPH/T3

Measuring volume
The effective penetration depth of the probe T3 is about 15 cm with the highest sensitivity in the immediate vicinity of the access tube, and decreases exponentially as distance increases.

University of Applied Sciences in Mannheim, Germany

The TRIME-PICO series is the most innovative solution for highly-accurate moisture measurement. We have carried out tests with the instruments usually available on the market and none of them except TRIME was able to achieve a high level of accuracy in very saline soil. And thanks to Bluetooth, interfering wires are a thing of the past in mobile applications in the field. Top marks from us for the TRIME measurement system.

Prof. Dr. Christof Hübner

Wireless data management with a Palm-PC and Windows-Mobile

For users wanting to exploit modern PC technology to the full, we can supply the optimum means for measurement-data management on location, right at the point of measurement, using a Palm-PC with Windows-Mobile. All what you need is IMKO’s robust PDA or use any commercially available PDA with Bluetooth® and Microsoft® Windows Mobile®. And PICO-BT, the Bluetooth® module for the PICO sensors, is included with the PICO- TALK software for Windows Mobile®.

...more information about the PICO-BT module

Wireless soil moisture measurement with PICO-BT Wireless soil moisture measurement with PICO-BT


Power supply:


Power consumption:

100mA @ 12V/DC during 2..3sec. of measuring

Moisture measuring range:

0..100% volumetric water content

Accuracy (in % volumetric water content):

conductivity range:




Moisture range 0..40%:



with tube access probe T3C/44

Moisture range 40..70%:



Repeating accuracy:



Temperature caused drift of electronics
(full range):


Soil temperature measuring range:


Soil temperature measuring accuracy:

±1,5°C absolute, ±0,5°C relative

Measurement volume:

3,0L ≙ 180x150mm diameter

Operating Temperature:

-15°C...50°C (extended temperature range on request)


Calibration for a wide range of standard soil types (in accordance with Topp (equation))

standard calibration for most soils
customizable material specific calibration
storage of up to 15 user defined calibration curves
calibration of dialectric permittivity is possible

Probe body:

waterproof sealed PVC (IP68)


166 x Ø32mm

Rod lenght:

standard: 180mm

Rod diameter:



0..100% vol. water content
-40..+70°C soil temperature


3,5m cable with 7-pin female connector