ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
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FOM/mts is provided with a 256 by 64 dot matrix graphic LCD to<br />
display data and TDR trace s<strong>im</strong>ultaneously. Also adequate probes are<br />
offered:<br />
−<br />
−<br />
FP/m, field probe for measurements of soil water content,<br />
FP/mts, field probe for s<strong>im</strong>ultaneous measurements of soil water<br />
content, temperature and salinity.<br />
LOM is an IBM PC compatible aided device working under control of special<br />
software. It has been designated mainly to control long term laboratory<br />
exper<strong>im</strong>ents which require monitoring of water, salt and heat transport by means<br />
of periodic recording of instantaneous soil water content, capillary tension,<br />
temperature and electrical conductivity profiles in chosen t<strong>im</strong>e intervals. To read<br />
water content a factory installed conversion equation for mineral or organic soils<br />
can be chosen and/or user determined calibration functions could be applied as<br />
well.<br />
To switch between probes LOM is provided with a Single-Pole-f-Throw<br />
multiplexer (SPfT, where 2 ≤ f ≤ 15) for first level multiplexing and a special port<br />
to control second level multiplexers. Up to 15 of SPsT second level multiplexers<br />
can be incorporated, where 2 ≤ s ≤ 8. This makes it possible to scan up to 120<br />
LP/ms, 120 LP/t and 120 LP/p probes.<br />
LOM works with the following probes:<br />
• LP/ms, Laboratory miniProbe for recording instantaneous profiles of<br />
water content and salinity in soil columns or in undisturbed soil cores,<br />
• UP/ms, User-made Probe for water content and salinity,<br />
• LP/p, Laboratory Probe (minitensiometer) for measurements of soil<br />
water capillary pressure (suction force, matrix potential),<br />
• LP/t, Laboratory Probe for temperature measurement.<br />
Several LP-probes of a selected kind or of all types can be inserted through<br />
the wall of a soil column or a steel sampling cylinder, thus allowing vertical<br />
scanning of the instantaneous water content, capillary tension (matrix potential,<br />
suction force), temperature and electrical conductivity profiles. This makes it<br />
possible to collect a set of corresponding water content, water potential, electrical<br />
conductivity and temperature data from drying or wetting front transition, from<br />
which, after further processing, one can obtain a complete set of the unsaturated<br />
water flow characteristics of the soil ie water retention (PF) curve, unsaturated<br />
water conductivity (k-function), differential water capacity and unsaturated water<br />
diffusivity as well as the solute transport data. Also heat transport coefficients (as<br />
the thermal conductivity, thermal diffusivity, specific heat) can be determined if a<br />
heat flux meter is installed in the exper<strong>im</strong>ental column.<br />
120