Soil Matric Potential / Water Retention Curve
pF laboratory station
Application
Convenient determination of soil water characteristic curves (water retention curves) in the range of pF 1 to pF 2,9 (approx. 10 up to 750 hPa) with precisely controlled vacuum.
Principles of operation
Desk instrument is integrated vacuum pump and vacuum control technique (230/110 V AC).
Porous suction plate has hydrophilic plastic membrane and is extremely high-water permeability.
Therefore, rapid drainage of soil samples is compared to other methods.
Dry suction plates are ready for operation immediately after simply moistening them with a dash bottle.
It is vacuum controlled by a microprocessor, electronic pressure transducer and integrated membrane pump.
Limiting values are set precisely and independently of each other with a resolution of 1 hPa.
There is controller with a key pad area and with three displays for system pressure, upper and lower limiting value.
Evaporation of soil samples is prevented by a transparent lid. Up to 40 soil sample rings with D = 53 mm can be drained simultaneously;
there are connectors for four pF pressure step modules and/or further pF suction plate modules (items 4252 and 4255/4256).
| Technical Data | |
| Active drainage area | 480 x 280 mm |
| Bubble point | at least 1000 hPa |
| Vacuum control | Microprocessor with pressure transducer |
| Display | 3 separate displays for system pressure, upper, and lower limiting value |
| Amount of samples | approx. 40 with D = 53 mm
approx. 30 with D = 60 mm |
| Expandability | 4 additional modules (see accessories) |
| Vacuum buffer volume | approx. 14 L |
| Power supply | 230 or 110 V AC |
| Pump performance | 120 W, 33 L min-1 against atmosphere |
| Dimensions | (B x H x T = 760 x 580 x 605 mm) |
| Versions | Ord. No. |
| Basic version | 4251 |
| Options and accessories | Ord. No. |
| pF pressure step module | 4252 |
| pF suction plate module | 4255 |