UMS Product Catalog Release 3.0
UMS Product Catalog Release 3.0
UMS Product Catalog Release 3.0
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Units & Standards<br />
Guide to water potential units<br />
pF hPa kPa bar psi rF<br />
Wet 1 10 1 0.01 0.1450 0.999993<br />
2 100 10 0.1 1.4504 0.999926<br />
FK field capacity 2.53 339 33.9 0.33 4.9145 0.999756<br />
Standard tensiometer range 2.93 851 85.1 0.85 12.345<br />
3 1 000 100 1 14.504 0.999261<br />
4 10 000 1 000 10 145.04 0.992638<br />
Please PWP permanent do not hesitate wilting point to contact us for further 4.18 information 15 136 and assistance 1 513 or for a 15quotation:<br />
219.52 0.988977<br />
5 100 000 10 000 1 00 1 450.4 0.928772<br />
Air-dry, depending on humidity 6 1 000 000 100 000 1 000 14 504 0.477632<br />
Oven-dry 7 10 000 000 1 000 000 10 000 145 038 0.000618<br />
pF - is the base 10 logarithm of the water potential in cm<br />
hPa - soil water pressure in [hPa] related to atmospheric pressure<br />
kPa - soil water pressure in [kPa] related to atmospheric pressure<br />
bar - soil water pressure in [bar] related to atmospheric pressure<br />
psi - soil water pressure in [psi] related to atmospheric pressure<br />
rF - is the relative humidity computed assuming an air temperature of 293 K<br />
Signal definition of our Tensiometers<br />
Tensiometers measure soil water tensions (suction forces), which are negative pressures. Therefore, tension readings<br />
of our Tensiometers have a negative sign. In reverse, if soils are saturated and the Tensiometer is below a water level,<br />
the readings have a positive sign (pressure of water).<br />
This changed definition has become effective on 1st January 2006.<br />
IP protection classes<br />
IPXY<br />
X - 1st digit- protection against solid objects<br />
Y - 2nd digit - protection against liquids<br />
1st digit Degree of protection 2nd digit Degree of protection<br />
0 No protection 0 No protection<br />
1 Protected against solid objects over 50 mm 1 Protected against vertically falling drops of water.<br />
2 Protected against solid objects over 12 mm 2 Protected against direct sprays of water up to 15 °<br />
from the vertical.<br />
3 Protected against solid objects over 2,5 mm 3 Protected against sprays to 60° from the vertical .<br />
4 Protected against solid objects over 1 mm 4 Protected against water sprayed from all directions<br />
– limited ingress permitted.<br />
5 Protected against dust – limited ingress permitted<br />
(no harmfull deposit.)<br />
5 Protected agains low pressure jets of water from all<br />
directions - limited ingress permitted.<br />
6 Totally protected against dust. 6 Protected against strong jets of water e g for use on<br />
shipdecks - limited ingress permitted.<br />
7 Protected against the affects of immersion between<br />
15 cm and 1 m.<br />
8 Protected against long periods of immersion under<br />
pressure.<br />
Protection classification according to DIN EN 60529 (VDE 0470)<br />
Example: IP65<br />
IP6x - Totally protected against dust.<br />
IPx5 - Protected agains low pressure jets of water from all directions - limited ingress permitted.<br />
32 <strong>UMS</strong> GmbH • Gmunder Str. 37 • 81379 Muenchen • Germany • Tel.: +49 (0) 89-12 66 52-0 • Fax: +49 (0) 89-12 66 52-20 • www.ums-muc.de
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