Model No FOM/mts TDR soil Moisture meter FEATURES

INSTITUTE OF AGROPHYSICS
Polish Academy of Sciences
20-290 Lublin, Doswiadczalna 4 Poland
Tel. +48 81 7445061 Fax. +48 81 7445067
www.easytest.ipan.lublin.pl
FEATURES.
Sensor:
a section of a transmission line made of two,
100 mm long, parallel stainless steel rods
having 2 mm in the diameter and separated
by 16 mm.
Sensor support: A section of PCV tube 2
cm in the outer diameter and optional length
(15 cm - 150 cm or longer) dependent on the
intended depth of the sensor installation.
Cable length: 5 m from the sensor to the
BNC terminating connector.
FP/mts
Field Probes for the Determination of Soil Moisture,
Temperature and Salinity.
Sphere of influence: a cylinder having
approximated diameter of 5 cm and height of
13 cm, circumference around the sensor
rods.
FP is a Time-Domain Reflectometry (TDR) probe for momentary or semipermanent installation. Thin-wall PVC
body of the probe provides ultimate low heat conductivity, thus allowing to avoid the parasite "thermal bridge"
effects on distribution of soil moisture content in the probe sensor vicinity. Through a preaugered pilot hole it
can reach any depth without destroying either the soil structure or disturbing the heat and mass transport in the
soil. For semipermanent installation the probe can be inserted horizontally through a side wall of a soil pit or
slantwise from the soil surface. The probe installed once may be left intact in the soil for as long as necessary
and then drawn out at the end of the experiment. It may also be used for momentary measurements in shallow
layers of the soil profile by walking over the field and inserting the probe in chosen sites.
FP/m is a probe for in situ field measurement of the soil moisture whereas FP/mts is its modification for
simultaneous measurement of moisture, temperature and salinity (electrical conductivity) of the soil from the
same sampling volume. Both are suitable for periodic measurements at random and/or fixed locations, where
instantaneous profiles of water content, temperature and salinity are to be determined by readings taken at
various levels of the soil profile.
The shortest available probe is 15 cm long. Its support pipe has not any bending. It can reach the depth from 5
cm to 15 cm, dependent on the probe inclination. The longest possible probe is 400 cm long. Probes longer
than 150 cm are delivered as a kit to be assembled by user.
The 100 cm probe can be used for momentary measurements in shallow layers of the soil profile by walking
over the field and inserting the probe in chosen sites. Remaining probes are calculated for the deviation angle,
a, of 30 deg. to reach the depths, D, of: 5 cm, 10 cm, 15 cm, 30 cm, 60 cm and 120 cm respectively.
EasyTest is a part of the Institute of Agrophysics, Polish Academy of Sciences
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