Precise readings form the basis of your scientific work!
Capacitive methods are marginally lower in price than TRIME® -TDR, but they don‘t provide the measuring precision required for scientific work.
Comparison of TRIME®-TDR (TIME DOMAIN REFLECTOMETRY) and capacitive soil moisture measurement systems (i.e. DeltaT, Campbell, Sentek)
Subject TRIME®-TDR capacitive method
(i.e. Delta-T, Campbell, Sentek)
Water content

+ High accuracy even for
high soil water contents (up to 70% by vol)

+ In contrast to other measurement techniques TRIME®-TDR guarantees correct readings in soils under saturated condition. An exact measurement value at near saturation is essential to obtain a reliable input when working on e.g.:
- water balance modelling
- groundwater regeneration and seepage water modelling
- erosion assessment
- land slide risk assessment
- recognizing nutrient discharge- or moisturelogging during irrigating
- flood prediction

- Poor determination
of high soil moisture content (unsatisfactory in cohesive soil >35% by vol.)

Long-time stability

+ TRIME-TDR uses coated and thus isolated rods which guarantee the non-appearance of galvanic accumulation along the rods. Thus TRIME-TDR sensors are suitable for long-run installations.

- Blank rods and therefore danger of galvanic reactions and possible influence on the sensors reading.
Electrical conductivity
+ Excellent accuracy in high pore water electrical conductivity conditions (up to max. 50dS/m). Coated rods. - Reading depends heavily on pore water electrical conductivity > 1dS/m. Rods without coating.
Soil type
+ Accurate measurement in clay and organic soil (soil specific calibration required) - Insufficient accuracy in clay and organic soil (soil specific calibration required)
Calibration
+ Universal calibration for mineral soils. Soil specific calibration can be easily established with TRIME software tools. - Soil specific calibration necessary
Probe geometry
+ No influence of the geometry of the rods on the reading. - Strong influence of the geometry of the rods on the reading (i.e. when bending the rods by pushing them into the soil)
Measurement field
+ Rod length up to 30cm available, great penetration depth of the electrical field = large measurement field - Only short rod length possible, little penetration depth of the electrical field = small measurement field
Surrounding conditions
+ Little effect of electromagnetic noise on the reading - Strong effect of electromagnetic noise on the reading
Maintenance
+ Rods are replaceable - Rods are mostly not replaceable
TRIME-TDR in comparison with conventional TDR
Subject TRIME®-TDR conventional TDR
Large-scale soil moisture measurement projects

+ TRIME-TDR sensors with inside network capability are not limited concerning cable length and can be used problem free in large scale monitoring systems.

+ Modular, flexible, and extendable set-up of TRIME-probes and other environmental sensors inside the ENVIS network

- TDR-sensors with TDR-multiplexers are limited with a cable length of up to 10m. The longer the high frequency TDR-cable the higher the measurement deviation. TDR-cables in wet surroundings induce considerable measurement deviations and can fail.

- Very high efforts and costs in cabling because every single sensor needs a single cable.

TRIME Comparison collage

Exact material moisture measurement is also crucial when

  • Assessing structures
  • Creating soil or climate models
  • Drying and processing bulk produce

The TRIME®-TDR technology guarantees a precise, direct, non-destructive and cost-efficient measurement of material moisture in many applications.
At the same time the reliable and easy-to-use IMKO data logging systems facilitate gathering your measurement data.