measurement range of suction sensors

[Cliff Hignett]

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[Sorry, this one appears to have slipped through the cracks, but I will
send it now. Bruce]

> My apologies SOWACers !  My reply yesterday giving  the range of watermark
> and gypsum block sensors was prepared in haste and not checked for typos or
> other stupid errors.

The effective range of watermark sensors is from 10kPa to 80kPa  (and yes, you
can push this a bit further to over 100kPa but sensitivity is reducing in this
higher range)

The effective range of gypsum blocks is 200kPa to 600 kPa (again, you can
extend to both drier (1000kPa) and wetter (100kPa) ranges but at much reduced
sensitivity)

I repeat my previous comment, that for research applications, individual
sensor
calibration can increase precision quite a bit.    (and don't forget about
hysterysis)




--
Cliff Hignett
Soil Water Solutions
45a Ormond Ave
Daw Park
South Australia 5041
pH 61 (08) 8276 7706
WWW.SOILWATER.COM.AU