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Stem Psychrometer

The PSY1 Stem Psychrometer is a very powerful tool integrating all the ambient environmental parameters acting upon the plant such as solar radiation, temperature, humidity, wind speed and water availability into a single continuously measurable variable.

The PSY1 is a stand-alone instrument for the measurement of stem water potential. It can continuously log changes in plant water status/potential, which directly reflect the energy required to access water or the stress the plant is under.

SPECIFICATIONS FOR THE PSYCHROMETER
UnitsMPa
Range-0.1 MPa to -10 Mpa
(1 to 100 Bars)
Resolution0.01 MPa (0.1 Bar)
Accuracy±0.1 MPa (1 Bar)
Response TimeMeasurement mode: 51 seconds
Live mode: 1 second
Sampling Rate10 Hz
DATA
Computer InterfaceUSB, Wireless RF 2.4 GHz
Data StorageMicroSD Card
Memory CapacityUp to 16GB, 8GB MicroSD card included.
OPERATING CONDITIONS
Temperature Range-10 to 50°C
R/H Range0-99%
DIMENSIONS
LoggerLength: 170 mm
Width: 80 mm
Depth: 35 mm
Psychrometer ChamberDiameter: 25.5mm
Depth: 20mm
Depth with calibration chamber: 30mm
SPECIFICATIONS FOR THE METER
INSTRUMENT LOGGING
Analogue Channels1x Input, (1x Sensor) High precision 24bit ADC circuit
1x Output – PSY Chamber Heater Circuit
Minimum Logging Interval1 second
Delayed StartSuspend Logging, Customised Intervals
Sampling Frequency10Hz
DATA
CommunicationsUSB, Wireless Radio Frequency 2.4 GHz
Data StorageMicroSD Card, SD, SDHC & SDXC Compatible (FAT32 format)
Software CompatibilityWindows 8, 8.1, 10 and Mac
Data CompatibilityFAT32 compatible for direct exchange of SD card with any Windows PC and Mac
Data File FormatComma Separated Values (CSV) for compatibility with all software programs
Memory CapacityUp to 16GB, 8GB MicroSD card included.
OPERATING CONDITIONS
Temperature Range-10°C to +50°C
R/H Range0-100%
UpgradableUser Upgradeable firmware using USB boot strap loader function
POWER
Internal Battery Specifications
950mAh Lithium Polymer, 4.20 Volts fully charged
External Power Requirements
Bus Power8-30 Volts DC, non-polarised, current draw is 190mA maximum at 17 volts per logger
USB Power5 Volts DC
Internal Charge Rate
Bus Power60mA – 200mA Variable internal charge rate, maximum charge rate of 200mA active when the external voltage rises above 16 Volts DC
USB Power100mA fixed charge rate
Internal Power Management
Fully Charged Battery4.20 Volts
Low Power Mode3.60 Volts – Instrument ceases to take measurements
Discharged Battery2.90 Volts – Instrument automatically switches off at and below this voltage when no external power connected.
Battery Life varies
With a recommended power source connected, operation can be continuous.3 days at hourly logging interval without chamber heating1 day with chamber heating

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Stem Psychrometer

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