QT-1021 ET evapotranspiration station

Product Details

QT-1021 evapotranspiration station is designed based on the potential evapotranspiration method (ETO method). Designed for agriculture and irrigation control. This station can calculate the potential evapotranspiration (ETO) according to the Penman-Monteith equation, the total water loss from soil evaporation and plant transpiration. ETO results in favorable irrigation control; efficient use of water resources.

QT-1021 Evapotranspiration Station

Principle introduction

Penman-Monteith is based on the theory of energy balance and water vapor diffusion, that is, considering the effects of aerodynamics and radiation terms, as well as the physiological characteristics of the crop, it is considered that the underside crop canopy surface cannot be viewed even under sufficient water supply. It is a saturated layer, and the surface resistance parameter is introduced in its calculation formula to characterize the resistance of leaf stomata and surface soil to water vapor transmission during crop physiological processes. The applicable conditions of this equation are stable conditions, that is, the temperature, atmospheric pressure, and wind speed distributions approximately meet adiabatic conditions (no heat exchange). If the equation is used for a small period of time (1 hour or less), a stable correction is required. However, when the reference surface ET0 is used to estimate the sufficient water supply, the heat exchange is small and generally no stable correction is required. The Penman-Monteith formula comprehensively considers the influence of various meteorological factors on ET0, and it is a mechanism formula with a reliable physical basis and has been widely used in many countries and regions in the world. After decades of theoretical research and practical application, this formula has been recognized as a standard method for calculating ET0.

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Penman-Monteith formula:

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System Features:

l Suitable for agricultural production, scientific research and standard measurement

l Easy to install and maintain

l Built-in calculation formula can directly obtain evapotranspiration value

l Data collection density can be set by yourself

l Status monitoring

l Support AC / solar power supply

l Maintenance-free, suitable for field applications

lSingle-station application or network deployment, wireless data transmission

l Large-capacity data storage

Network management software (optional):

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a) Management function: It has functions of hierarchical management of data and management of monitoring points.

b) Collection function: collect the soil moisture monitoring data at the monitoring point.

c) Alarm function: data alarm function.

d) Query function: The monitoring system software can query various historical records.

e) Storage function: The front-end monitoring equipment has a large capacity data storage function; the monitoring center database can record all historical data.

f) Analysis function: The data can generate curves and reports for trend analysis.

Technical Parameters

CR1000

Data collector

Technical Parameters

Maximum sampling frequency

100Hz

Analog channel

8 differential channels (16 single-ended channels)

Pulse channel

2

Control output

8

Excitation channel

3 voltage channels

Other ports

4 SDI-12 or 4 RS232 (shared with 8 control output interfaces)

Data communication port

1 CS I / O; 1 RS-232; 1 parallel peripheral

Signal input range

± 5000mV

A / D conversion accuracy

13-bit analog / digital conversion

Measurement resolution

0.33 µV

measurement accuracy

± (reading * 0.06% + offset), 0 ~ 40 ℃

Built-in storage space

4M

Supply voltage

9.6 ~ 16VDC

Power consumption

Sleep mode: 0.6mA, 1Hz acquisition frequency: 4.2mA

size

23.9 × 10.2 × 6.1cm

Operating temperature

-25 ~ 50 ℃; -55 ~ 85 ℃ (extended)

CS215 temperature and humidity sensor

CS215

Technical Parameters

Temperature Sensor

Measuring range

-40 ~ 70 ℃

measurement accuracy

± 0.3 ℃ (at 25 ℃), ± 0.4 ℃ (5 ~ 40 ℃), ± 0.9 ℃ (-40 ~ 70 ℃)

Response time

<120 s

Output resolution

0.1 ℃

Relative humidity sensor

Measuring range

0 ~ 100% RH (at -20 ~ 60 ℃)

measurement accuracy

(At 25 ℃): ± 2% (10 ~ 90% RH); ± 4% (0 ~ 100% RH)

Temperature dependence

Better than ± 2% (at 20 ~ 60 ℃)

Short-term lag

＜ 1.0% RH

Long-term stability

Better than ± 1% RH / year

Response time

<10 s (63%, wind speed 1m / s)

calibration

NIST, NPL

Other technical parameters

Supply voltage

6 ~ 16VDC (12VDC interface of data collector is recommended)

Current consumption

120μA at rest, 1.7mA at measurement (for 0.7 seconds)

Operating temperature

-40 ~ 70 ℃

size

18cm in length, 1.2cm / 1.8cm in diameter (probe end / cable end)

weight

150g

TE525 rainfall

TE525

Technical Parameters

sensor type

Magnetic reed switch

Output

Switch signal

Accuracy

1.0% up to 2 "/ hr (50 mm / hr)

Collector size

24.5cm diameter x 29.21cm high

Collector area

214cm2

Operating temperature

0 ~ 50 ℃

cable length

12 meters

material

Anodized aluminum

03002 wind speed and direction sensor

03002

Technical Parameters

Wind speed measurement range

0-50 m / s

Wind direction measurement range

360 degree mechanical, 355 degree electronic.

Wind speed measurement accuracy

± 0.49 m / s

Wind direction measurement accuracy

± 5 degrees

Wind speed

1.1 m / s

Damping ratio

0.2

Wind speed signal output

Electromagnetically induced AC sinusoidal voltage, 1 pulse per loop.

Wind direction signal output

10K potentiometer, linearity: 0.5%

Potentiometer excitation

5-15VDC

Linear adapter

12-30VDC

Mounting rod diameter

34mm

Sensor net weight

0.7Kg

SP-110 total radiation sensor

SP-110

Technical Parameters

Cosine response

(45-degree angle)

± 1%

Cosine response

(75 degree angle)

± 4%

Absolute measurement accuracy

± 5%

Uniformity

± 3%

Repeatability

± 1%

Sensitivity

0.200 mV per W m-2

Linear range

0-350 mV (0 ~ 1,750 W m-2)

Power consumption

no

working environment

-40 ° C ~ + 70 ° C; 0 ~ 100%

material

Anodized aluminum, acrylic plexiglass lens

cable

3 m shielded cable

size

2.4cm diameter, 2.75cm high

weight

70 g

Origin: United States