Indian Council of Agricultural Research
(Agricultural Knowledge Management Information System)

ICAR-Indian Institute of Water Management, Opposite Rail Vihar, Chandrashekharpur, Bhubaneswar-751023 Odisha (
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Instrument Details
Instrument/Facility Name: Pressure Chamber Apparatus
Make                                   : M/S PMS Instrument Co. USA
Model                                  : 600D
Specification   :Maximum Operating Pressure 40 bar Chamber Construction Hard Anodized Solid Stock Aluminum Chamber Size 2.5 inch inside diameter x 5.0 inch inside depth Read-out Digital Gauge (Reads in Bar, Mpa or PSI 2.5 Inch Diameter Gauge Bar – PSI Scale Size (L x W x H) 13 × 11 × 10 inches 33 × 28 × 24 centimeters Weight 13 Lbs / 6 Kg Gauge 2.5” Diameter Gauge 1/2 of 1% accuracy 40 bar (4 Mpa) range

Click to ViewThe units of pressure most commonly used are the Bar (1 Bar = 14.5 pounds per square inch) and the Mega Pascal (1 MPa = 10 bars).Because tension is measured, negative values are typically reported. An easy way to remember this is to think of water stress as a "deficit:" the more the stress, the more the plant is experiencing a deficit of water and is known as "water potential" of the plant measured by pressure chamber apparatus.

  Working Principles
Click to ViewAs the soil dries or humidity, wind or heat load increases, the roots struggles to keep pace with evaporation loss from the leaves and tension develops in tissue. Pressure chamber apparatus is a device for applying air pressure to a leaf (or small shoot), where most of the leaf is inside the chamber but a small part of the leaf stem (the petiole) is exposed to the outside of the chamber through a seal. The amount of pressure that it takes to cause water to appear at the petiole tells you how much tension the leaf is experiencing on its water: a high value of pressure means a high value of tension and a high degree of water stress.

  User Instructions
In Crop Physiology Research Specifically measurement of leaf/twig/branch water potential...As the equipment works under high pressure caution is to be taken for proper fixing of lid of the chamber before flushing nitrogen gas into chamber.

  Contact Us
Contact No. 06742300060
Email Id

  Pressure Chamber Apparatus Charges
Procedure Name
National LAB/R&D

Additional Rs 100/-towards postal charges if result are to be posted
The Demand Draft should be in favour of "ICAR UNIT IIWM Bhubaneswar"
Letter, DD & Samples send to "Director, ICAR-IIWM, Bhubaneswar"