Apparatus and apparatus assembly

1. A cell suitable for use in membrane assessment, the apparatus comprising:

a) a housing that provides a base supporting an adjustable piston system,

b) a membrane support surface, wherein the piston system, in use being able to adjust the height of the membrane support surface relative to the base plate of the housing,

c) a membrane being locatable on the membrane support surface, and

d) a constant temperature anemometer being located on the membrane support surface, which in use measures the cross-flow velocity of a fluid flowing on one side of the membrane, and

e) one or more laminar input flow channels that in use direct a fluid across one side of the membrane and

f) one or more laminar output flow channels that in use collect the fluid that has passed across the membrane.

2. The cell as claimed in claim 1 , wherein the piston system is biased towards the base of the housing by one or more threaded members comprising a coil spring that bias the membrane support surface toward the housing base.

3. The cell as claimed in claim 1 , wherein the membrane is locatable on the membrane support between one or more magnets.

4. The cell as claimed in claim 1 , wherein the piston system is adjustable in increments of 1 or more microns.

5. The cell as claimed in claim 1 , wherein there are a plurality of laminar input and output channels located along opposing ends of the cell.

6. The cell as claimed in claim 1 , wherein, in use, the height adjustment of the piston system is achieved by turning a worm screw, that engages with and turns a worm gear, which worm gear rotates a threaded member, which threaded member rotates a nut, which threaded member moves the membrane support surface and adjusts its height.

7. The cell as claimed in claim 6 , wherein the worm gear is a scissor gear.

8. The cell as claimed in claim 1 , wherein the membrane is locatable on the membrane support surface without requiring one or more membrane perforations.

9. The cell as claimed in claim 1 , wherein the cell is suitable for use in an osmotic membrane assessment.

10. An apparatus assembly that comprises two cells as claimed in claim 1 , coupled together and separated by one membrane, wherein in use, one cell is dedicated to a first fluid on one side of the membrane and the other cell is dedicated to a second fluid on the other side of the membrane.

11. The apparatus assembly as claimed in claim 10 , wherein the two cells are coupled together by one or more toggle latch catches that have a holding force greater than 10 kilograms.

12. The apparatus assembly as claimed in claim 11 , suitable for use in an osmotic membrane assessment.

13. The apparatus assembly as claimed claim 12 , which further comprises an external shaft that in use shows the height of the piston within the assembly.

14. The apparatus assembly as claimed in claim 13 , wherein the laminar input and output flow channels are connectable to externally located fluid inlet and outlet reservoirs.

15. An apparatus kit that comprises:

a) an apparatus assembly as in claim 10 ,

b) a mass balance,

c) a pump,

d) an inline chiller; and an

e) Inline heater,

wherein in use, the kit elements are connected in a circuit with the mass balance connected to the pump, the pump is connected to the inline chiller, which inline chiller is connected to the inline heater, which inline heater is connected to the apparatus assembly and which apparatus assembly is connected to the mass balance for use in assessing the performance of a membrane with the apparatus assembly.

16. The apparatus kit as claimed in claim 15 , wherein the mass balance in the kit is an enclosed mass balance that prevents volatile compounds being released into the atmosphere.