Shanghai Yuansheng Company is the national distributor of WESCOR PSYPRO® dew point water meter. The price is favorable. Welcome to consult! Contact number
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Note: When the instrument display voltage is lower than 11.7V (Bat=11.7V), please charge! Otherwise the instrument cannot be used.
Working principle:
The Psypro dew point water potential measurement system measures the water potential by measuring the relative humidity of a solid or liquid equilibrium. Relationship between water potential and relative humidity: Ψ = (RT/ Vw)e/eo
Ψ—the total water potential
R—Universal gas constant (8.314 J•mol-1• K-1)
T—absolute temperature (K)
e/eo - relative humidity
Vw—the molar volume of water (1.8 × 105 m3 • mol-1)
The water potential supporting plant growth ranges from 0 to -1.5 MPa and the relative humidity is from 1.0 to 0.993.
Each probe is connected to a thermocouple. The measurement principle is:
1. The thermocouple passes a current of 8 mA, which produces a cooling effect. This time is optional, but the temperature of the thermocouple must be cooled to the dew point (temperature at vapor equilibrium) and condensed on the junction of the thermocouple.
2. The current is stopped, and the water vapor condenses at the junction of the thermocouple to release heat, so that the temperature of the thermocouple rises to the ambient temperature and reaches an equilibrium state.
3. At this time, the output voltage of the thermocouple is recorded by the instrument, and the cooling coefficient of the thermocouple determines the range of measurement.
Example: The cooling coefficient of the thermocouple Πv=50μV, the lowest water potential that can be measured is:
50 μV/-4.7 μV MPa-1= -10.64 MPa (106.4 bars)
Wescor's thermocouples typically have a cooling factor of 50 to 80 μV.
Probe:
C-52 sample holder: 9.5mm in diameter and 4.5mm in depth for soil and other larger samples;
7mm in diameter and 2.5mm in depth for blades;
9.5mm in diameter and 1.25mm in depth for standard filter paper;
PST-55 Soil water potential probe: 15cm buried in the soil in situ, measuring soil water potential;
L-51A Leaf Water Potential Probe: In-situ damage the leaves into the probe, sealant seal, measure the water potential of the leaves;
L-51A Blade Leaf Water Potential Probe: The non-destructive blade of grass is clamped into the probe in situ, sealed by a sealant, and the water potential of the blade is measured.
Probe scan:
Example: set as follows
Cooling Current seconds = 15 seconds
Measurement Period = 20 seconds
Delay Seconds After Cooling = 5 seconds
Average Reading Time (Read Average Seconds) = 6 seconds
1. Scan from the first probe (point A)
2. The probe is cooled by current for 15 seconds (point A - point B)
3. The measurement time (point B - point E) is 20 seconds, and 50 values ​​are read out, each reading is 0.4 seconds apart (20 seconds / 50 readings = 0.4 seconds)
4. After the cooling current is disconnected, wait for 5 seconds (point B - point C). Note that the waiting time is also counted in the measurement time. During this period, the reading has started.
5. Since the reading interval is 0.4 seconds and the average reading time is 6 seconds, 15 numbers will be read out in 6 seconds, and the average value (C point - D point) will be calculated; after the end of the scan, the average value of the equilibrium state water potential and other data will be recorded.
6. Two forms of data logging: Log Results Only, or record results plus 50 readings (Log Results Plus Entire Psychrometric Curve (50 pt. array))
Example: Record results only (Log Results Only)
Psy# | Yr | Day | Time | Bat V | Cool mV | Temp C | Offset μV | Wetbulb μV | WP MPa |
1 | 03 | 037 | 14:14 | 12.6 | twenty four | 23.39 | 1.43 | 9.79 | -2.51 |
1 | 03 | 037 | 14:1 9 | 12.6 | twenty four | 23. 21 | 1. 25 | 9. 81 | -2.51 |
Psy#: probe serial number (thermocouple wet ball meter psychrometer #)
Yr: Year (Year)
Day: days (Julian Date)
Time: time (Time)
Bat: Battery Voltage
Cool: thermocouple through current cooling voltage mV
Temp: Temperature (Temperature)
Offset: the offset voltage
Wetbulb: thermocouple condensation junction (wet bulb) microvolt (μV) reading, ie average reading
WP: Water Potential MPa (Water Potential)
Example: Record results and add 50 readings (Log Results Plus Entire Psychrometric Curve (50 pt. array))
Sec: Interval interval (interval seconds = measurement period / 50)
Psy uV: microvolt reading (μV) per reading point
7. The total scan time is equal to the cooldown plus the measurement time, plus the time required for data calculation, internal calibration, and disk storage is approximately 15 seconds.
If 8 probes are used together, it takes 6 minutes to complete the total cycle, so the interval must be set.
Quickly start the water potential meter with a computer
1. Connecting to a computer
2. Install the application software: the file name is SETUP.EXE
3. Connect the probe: connect by serial number
4. Turn on the instrument: display screen 1
5. Connect the water meter signal: Open the software, click on "Tools", click on "Contact PSYPRO", click on "CONNECT"
6. Set the date and time: Open the software, click on "Tools", click on "Set PSYPRO Time", click on "CONNECT" and click on "OK"
7. Set the water gauge by default: Click on "File", click on "Save PSYPRO Settings", click on "To PSYPRO" and "OK", click on "CONNECT"
8. Record data
9. Save the data: Click on "Tools", click on "Save PSYPRO Data", click on "CONNECT", select "Acquire all PSYPRO data" or "Acquire data since last download", click on "OK"
If the water potential meter number is 01, 8 probes are used, the recording mode is set to "Log results only", and the file name is "P01_Ps#1.csv ... P01_Ps#8.csv"
If the water potential meter number is 01, 8 probes are used, and the recording mode is set to “Log Results Plus Entire Psychrometric Curve (50 pt. array)â€, it will be divided into two file names, and the result data exists “P01_Ps#1.csv ...... In the P01_Ps#8.csv" file, 50 readings exist in the file "P01_Ps#1_50point.csv...P01_Ps#8_50point.csv"
Quickly start the water potential meter with the button
Example: manual measurement
1. Turn on the instrument and display screen 1
Set the brightness, date and time of the screen. If logging is set to on at this time, if you press “mode key†to select screen 2, the screen will be displayed.
2. Selection screen 8
Set Backlight to always on (always on)
Set Logging to off
3. Selection screen 6
Set Scan= 10 sec (must be set first): scan time is 10 seconds
Psy cool = 10 sec: thermocouple cooling time is 10 seconds
Plat = 5.6 sec: wait time is 5.6 seconds
Av = 1.0 sec: average reading time is 1 second
P#1 Correction = 1.000 : The first probe correction factor is 1.000
4. Connect the probe and add the sample
5. Selection screen 2
Set psy # = 1
Press the "mode key" up and down keys to move the cursor to "Start:V>"
Press "value" right button to start scanning, the screen displays the reading
6. Optional screen 3, view cooling voltage example: automatic measurement
1. Turn on the instrument and display screen 1
Set the brightness, date, and time of the screen
2. Selection screen 7
Set the scan interval time, select the recording mode, reference temperature
3. Selection screen 6
Set Scan= 10 sec (must be set first): scan time is 10 seconds
Psy cool = 10 sec: thermocouple cooling time is 10 seconds
Plat = 5.6 sec: wait time is 5.6 seconds
Av = 1.0 sec: average reading time is 1 second
P#1 Correction = 1.000 : The first probe correction factor is 1.000
4. Connect the probe and add the sample
5. Selection screen 8
Set Backlight to always on (always on)
Set Logging to on
The instrument automatically records the record
6. Select screen 4 or 5 to view the record
7. Screen 9 can be selected to clear the data stored by the instrument
Press the value left button 9 times and the screen changes to
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