The Plant Water Status Console, Model 3005F01, is supplied with a compressed gas cylinder and connected pressure regulator for field operation. The pressure regulator has been set at the factory for the maximum operating pressure of the unit which, for standard units, is 600 psi.
Theory of operation
The roots of a plant are using reverse osmotic forces to overcome the matrix potential of the soil. The stomates on the leaves of a plant are transpiring at different rates throughout the day. The resulting tension in the xylem column can be measured using a plant water status console device.
The petiole of a leaf or stem is placed in a rubber grommet so the leaves are inside the pressure chamber and the stem is outside at atmospheric pressure. By pressurizing the chamber and watching the point where the sap oozes out of the stem at atmospheric pressure the 2 forces are in balance – the reading on the gauge and the tension in the xylem column. This value can vary from the bottom to the top of the plant and at different times of the day due to temperature, humidity, sunlight, and wind. By stressing the plant, better crops can be produced and water use better managed.
Specifications
- 22 cubic foot aluminum DOT-3AL aluminum cylinder with CGA-580 fitting rated for 2216 psi – requires hydrostatic testing every 5 years.
- Single stage, step-down regulator set to 600 psi at the factory (can be reset by user if necessary).
- Standard pressure vessel 7˝, 0.5 liter volume, 2.4 kg, 40 or 80 bars. Cam lock. Specimen holder with safety valve. Internal diameter 2.73˝ with vertical useable height 5.837˝.
- 12˝ and 20˝ vessels also available. 12˝, 3.8 kg, 1 liter volume, 10.837” height. 20”, 6.3 kg, 1.8 liter, 19.837˝ height.
- All vessels 2.73˝ diameter and rated for 80 bars with cam lock and safety valve features. Made of stainless steel for a lifetime of use.
- 6˝ scientific test gauge with beryllium copper movement and stainless steel case, ¼ of 1% full scale accuracy and the highest quality you can buy for many years of service.
- 600 psi gauge, 40 bars. Subdivisions 2 psi, 0.2Bars, 20 kPa.•
- Resolution ½ a division. Dual scale psi + kPa, Parallax mirror and adjustable needle to re-zero if necessary.
- 1500 psi gauge, 80 bars. Subdivisions 10 psi, 0.5 Bars, 50 kPa.•
- Resolution ½ a division. Dual scale psi + kPa, Parallax mirror and adjustable needle to re-zero if necessary.
Ordering information
3000F01H12G2P40 PLANT WATER STATUS CONSOLE, NO TANK (12 inch (30 cm) Pressure Vessel, G2 Specimen Holder, 40 Bar gauge)
3000F01H12G2P80 PLANT WATER STATUS CONSOLE, NO TANK (12 inch (30 cm) Pressure Vessel, G2 Specimen Holder, 80 Bar gauge)
3000F01H12G4P40 PLANT WATER STATUS CONSOLE, NO TANK (12 inch (30 cm) Pressure Vessel, G4 Specimen Holder, 40 Bar gauge)
3000F01H12G4P80 PLANT WATER STATUS CONSOLE, NO TANK (12 inch (30 cm) Pressure Vessel, G4 Specimen Holder, 80 Bar gauge)
3000F01H20G2P40 PLANT WATER STATUS CONSOLE, NO TANK (20 inch Pressure Vessel, G2 Specimen Holder, 40 Bar gauge)
3000F01H20G2P80 PLANT WATER STATUS CONSOLE, NO TANK (20 inch Pressure Vessel, G2 Specimen Holder, 80 Bar gauge)
3000F01H20G4P40 PLANT WATER STATUS CONSOLE, NO TANK (20 inch Pressure Vessel, G4 Specimen Holder, 40 Bar gauge)
3000F01H20G4P80 PLANT WATER STATUS CONSOLE, NO TANK (20 inch Pressure Vessel, G4 Specimen Holder, 80 Bar gauge)
3000F01H07G2P40 PLANT WATER STATUS CONSOLE, NO TANK (7 inch Pressure Vessel, G2 Specimen Holder, 40 Bar gauge)
3000F01H07G2P80 PLANT WATER STATUS CONSOLE, NO TANK (7 inch Pressure Vessel, G2 Specimen Holder, 80 Bar gauge)
3000F01H07G4P40 PLANT WATER STATUS CONSOLE, NO TANK (7 inch Pressure Vessel, G4 Specimen Holder, 40 Bar gauge)
3000F01H07G4P80 PLANT WATER STATUS CONSOLE, NO TANK (7 inch Pressure Vessel, G4 Specimen Holder, 80 Bar gauge)
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