The Pump-Up Pressure Chamber is different from the conventional gas chamber in that it does not require a source of compressed gas. The instrument produces pressure in the chamber required to take water potential readings by pumping it as shown below. The relatively small chamber allows the user to achieve about one half Bar (7.25 psi) pressure per stroke. The instrument is limited to 20 Bar and is designed primarily for irrigation scheduling/monitoring, particularly for managing deficit irrigation.

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