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VH400 - Low-Cost Soil Moisture Sensors Quick view

Reference: VH400-2M

Brand: VEGETRONIX

VH400 - Low-Cost Soil Moisture Sensors

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VH400 Soil Moisture Sensor Probe Specifications Power consumption: < 13mA Supply Voltage: 3.5V to 20 VDC. Dimensions See drawing. Power on to Output stable: 400 ms Output Impedance: 10K ohms Operational Temperature: -40ºC to 85ºC Accuracy at 25°C: 2% Output: 0 to 3V related to moisture content Shell Color: Red Voltage Output Curves: Curves, Piecewise...
From Price €78.00
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M&J UA-002-64 HOBO Pendant Temperature/Light 64K Data Logger Quick view

Reference: UA-002-64

Brand: ONSET

UA-002-64 HOBO Pendant Temperature/Light 64K Data Logger

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A miniature, value-priced, waterproof data logger for temperature and light monitoring applications; stores 52K measurements.  IMPORTANT INFORMATION Requires HOBOware software and either an Optic USB Base Station or a HOBO Waterproof Shuttle (U-DTW-1). HOBOware Pro is required when using the HOBO Waterproof Shuttle. See compatible items below.
Price €100.00
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HFP01SC Heat Flux Sensor
  • HFP01SC Heat Flux Sensor
  • HFP01SC Heat Flux Sensor

HFP01SC Heat Flux Sensor

HFP01SC

Self-calibrating heat flux sensor

HFP01SC self-calibrating heat flux sensor™ is a heat flux sensor for use in the soil. It offers the best available accuracy and quality assurance of the measurement. The on-line self-test verifies the stable performance and good thermal contact of sensors that are buried and cannot be visually inspected and taken to the laboratory for recalibration. The self-test also includes self-calibration which compensates for measurement errors caused by the thermal conductivity of the surrounding soil (which varies with soil moisture content), for sensor non-stability and for temperature dependence.

Quantity

Description

Measurand
heat flux
Measurement range
-2000 to +2000 W/m²
Sensitivity (nominal)
60 x 10⁻⁶ V/(W/m)²
On-line functionality testing
self-test including self-calibration
Sensing area
8 x 10⁻⁴ m²
Sensor thermal resistance
81 x 10⁻⁴ K/(W/m²)
Rated operating temperature range
-30 to +70 °C
IP protection class
IP67
Film heater resistance
100 Ω ± 10 %
Film heater rated power supply
9 to 15 VDC
Interval between self-tests
6 hr
Heating interval duration
180 s
Power consumption daily average
0.02 W
Standard cable length
2 x 5 m

Description

The HFP01SC measures soil heat flux in W/m²
The HFP01SC measures soil heat flux in W/m². It is used when the highest level of quality assurance and high measurement accuracy are required. In essence, the HFP01SC is a combination of a heat flux sensor and a film heater. The output of the heat flux sensor is a voltage signal that is proportional to the heat flux through the sensor. At regular intervals, the film heater is activated to perform a self-test (see figure 4). The self-test results in a check of the sensor's contact with the soil and a new sensitivity that is valid for the circumstances at that time. The latter is called self-calibration. Implicitly, the cable connection, data acquisition and data processing are also tested. The result is much improved measurement accuracy and quality assurance in relation to measurements with conventional sensors such as the HFP01 model.

Unique Features and Benefits
Low thermal resistance
Large protection area (required by ISO 9869)
Low electrical resistance (low electrical noise pickup)
High sensitivity (good signal-to-noise ratio in low flow environments)
Robustness, including rugged cable (essential for permanently installed sensors)
IP protection class: IP67 (essential for outdoor applications)
Built-in film heater for self-test

Product Details
HFP01SC
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