PMS 670 large volume chamber

  • Large Leaf Pressure ChamberIdeal for measuring the water potential of large leaves and small shoots

Model 670 Pressure Chamber Instrument is unique in our instrument line in due to the large chamber. The chamber is 4 inches in diameter and 7 inches deep. We only recommend this instrument if you are working with a large leaf since it takes a large amount of nitrogen to fill the chamber and makes working with smaller samples time consuming. If you are looking at making routine water measurements for scheduling deficit irrigation or explaining plant water relations and do not need this large chamber we recommend the Model 600.


related products


The PMS 670 comes standard with a Compression Gland Sealing System fitted with a 1/2 Inch Compression Gland Gasket and Insert. This gasket will seal samples from 1/2 inch diameter down to 3/8 inch diameter.

If you need other sealing options such as bladed grass or other semi-round sizes check our other options. A Volume Reducer is not available for this instrument.

For extensive research projects you might consider a Model 1000 or Model 1505D due to the large range of operating pressure. The instrument requires a nitrogen source. You can use it in a lab or green house with a large cylinder or buy our light weight Portable Tank to allow for field work.


  • Maximum operating pressure: 40 bar
  • Chamber construction: Hard Anodized Solid Stock Aluminum
  • Read-out: Bourdon tube, Gauge bar, PSI scale
  • Size (L x W x H): 33 x 28 x 24 cm
  • Weight: 6kg
  • Accuracy: 1/2 of 1%

Instrument comes complete with: 1/4 Inch Compression Gland Sealing System, 5 Extra 1/4 Compression Gland Gaskets, 6 foot Filling Hose, 1 – Solid Lab Stopper for instrument testing, O-Ring lubricant and Lithium Grease, 11/32 inch wrench and 3/32 inch Allen Key for Control Valve Adjustment and a colour, Operating Instructions Manual.

recommended accessories
  • Portable Tank,
  • Extra Compression Gland Gaskets,
  • Volume Reducer- depending on plant type,
  • Lighted Hand Lens or
  • Instrument Mounted Eye Lens.