Measuring Leaf Osmotic Potential

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Specification Sheet

Plants

Osmotic Potential

PSY1 for Leaf Osmotic Potential

Optimal logging solution: Plant Water Potential Meter

Measuring Osmotic Potential using the PSY1 Stem Psychrometer

Osmotic potential can be performed on extracted sap samples or destructively sampled leaf tissue or leaf discs.

These measurements can be made in the lab or in the field. Samples are placed in the calibration lid of the PSY1 Stem Psychrometer. The psychrometer chamber is housed in the Osmotic Potential Insulator (OPI) to provide a thermally insulated boundary around the chamber. This eliminates the introduction of thermal gradients caused by a need to handle the chamber to load samples and provides a stable insulated thermal buffer from ambient temperature gradients within the surrounding environment. Removing these factors enables a very rapid equilibration time between samples and high accuracy of measurement from -0.1 MPa to -10 MPa.

More Details

Osmotic potential measurements are typically performed in a manual process. Using the Graphical User Interface (GUI) the PSY1 provides the user with a manual mode to facilitate the measurement of osmotic potentials from destructive samples.
The PSY1 can also be operated in an automated logging mode and data continuously collected. The PSY1 Stem Psychrometer is a very powerful and flexible instrument. It can measure both osmotic potential and water potential.

Performance Verification:

Independent testing by the University of New England, Armidale, Australia demonstrated that the PSY1 yields osmotic potential measurements as accurately (or more so) than the Wescor VAPRO Osmometer and within the same 40 second equilibration time per sample.
The difference being that the PSY1 can perform these measurements either in the lab or in the field. Never before have osmotic potentials and water potential been able to be measured in the field using the same instrumentation.

Specifications

Sensor Specifications

Meter Specifications

Instrument Logging
Instrument Specification Brochure
Analogue Channels	5 double ended or 10 single ended
Resolution	0.00001V—24-Bit
Accuracy	0.001V
Minimum Logging Interval	1 second
Delayed Start	Suspend Logging, Customised Intervals
Sampling Frequency	10Hz
Data
Communications	USB, Wireless Radio Frequency 2.4 GHz
Data Storage	MicroSD Card, SD, SDHC & SDXC Compatible (FAT32 format)
Software Compatibility	Windows XP, Vista and Windows 7
Data Compatibility	FAT32 compatible for direct exchange of SD card with any Windows PC
Data File Format	Comma Separated Values (CSV) for compatibility with all software programs
Memory Capacity	2GB expandable to 64GB
Operating Conditions
Temperature Range	-40 ° C to +80 ° C
R/H Range	0-100%
Upgradable	User Upgradeable firmware using USB boot strap loader function
Power
Power supply	12V DC 2-wire non polarized bus
Power Consumption	20 mA
Internal Battery Monitoring	Logging internal battery voltage & charging current
Charging Rate	Automatic variable rate of charging to maximise solar panel charging current on full sun days and or under low light cloudy conditions Variable current 10 mA to 200 mA