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.
PSY1 Psychrometer Features
Stem, leaf and root water potential
Ambient environmental parameters integration
Hydraulic conductivity
Plant water relations
Growth potential
Optimal logging solution: Plant Water Potential
INSTRUMENT LOGGING
Analogue Channels
1x Input, (1x Sensor) High precision 24bit ADC circuit 1x
Output – PSY Chamber Heater Circuit
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 7, 8, 8.1, 10 and Mac
Data Compatibility
FAT32 compatible for direct exchange of SD card with any
Windows PC and Mac
Data File Format
Comma Separated Values (CSV) for compatibility with all
software programs
Memory Capacity Up to 16GB, 4GB MicroSD card included.
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
Internal Battery Specifications
960mAh Lithium Polymer, 4.20 Volts fully charged
External Power Requirements
Bus Power
8-30 Volts DC, non-polarised, current draw is 190mA
maximum at 17 volts per logger
USB Power 5 Volts DC
Internal Charge Rate
Bus Power
60mA – 200mA Variable internal charge rate, maximum
charge rate of 200mA active when the external voltage rises
above 16 Volts DC
USB Power 100mA fixed charge rate
Internal Power Management
Fully Charged Battery 4.20 Volts
Low Power Mode 3.60 Volts – Instrument ceases to take measurements
Discharged Battery
2.90 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 heating
1 day with chamber heating
