Membrane Apparatus for PF Determination (PF 3.0-4.2)

Membrane apparatus for pF determination of pF 3.0 - 4.2 (1.0 - 15.0 bar). The standard set can hold up to 15 samples.
Determines the driest range of the pF curve
Uses overpressure on disturbed samples
Effective set-up
 
Description
Method
The determination of the range pF 3.0 - 4.2 (1.0 - 15.5 bar) with the membrane apparatus does not use samples cut in sample rings, but the semi-disturbed sample is saturated before measurement in the laboratory and placed in a synthetic ring.
To reach the high values of the pF-curve, it is necessary to apply pressure, up to 15.5 bar, on the samples, as it is not possible to create that amount of suction force. On reaching the equilibrium at the desired pressure value, the samples are removed, weighed, dried and weighed again. 
For measuring larger series of samples, an additional membrane extractor can be connected parallel to the first extractor.
The set contains:
Pressure membrane extractor suitable for a maximum of 15 samples
20 bar compressor including reducing valve
Pressure gauge
Air filter
Hoses
Cellophane membrane
Filter cloth
Synthetic soil sample retaining rings
Various accessories
Additional requirements
Successful pF determination with the membrane apparatus also requires a balance, drying oven and aluminium soil sample boxes with lids. 
Applications
Soil physical laboratory research
pF determination in the lab
Irrigation research