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Leaf sensors

PESSL INSTRUMENTS LEAF WETNESS

Leaf wetness

Order number: 600015 / 900025 

The leaf wetness sensor works by measuring the conductivity on a filter paper, which is held between two stainless steel electrodes in a transparent holder. The use of transparent Lucite plastic as a holder reduces the warming up of the sensor when it is exposed to direct sunlight.

FEATURE VALUE
Supply voltage
4.75 V – 5.25 V
Supply current
max. 1500 μA
Short circuit protection
Infinite (within supply voltage range)
Dry / Wet threshold
220 – 390 kOhm
Output
Dry: max. 0.4 VDC
Wet: min. VCC-0.4 VDC
Electronic
Totally plastic encapsulated – SMD
Dimensions
42 mm x 78 mm x 15 mm
Cable length
5 m

PESSL INSTRUMENTS LEAF TEMPERATURE

leaf_temperature

Order number: 600127 / 900169 (IMT), 600126 / 900171 (µMETOS)

IM522CD is a highly accurate leaf temperature sensor. It measures the radiated temperature around the surface of a leaf or a canopy.

FEATURE VALUE
Sensor
PT1000
Accuracy
min. 0.1°C (-30 °C to +99 °C)
Supply current
max. 200 µA
Short circuit protection
Infinite (within supply voltage range)
Short circuit supply current
max. 40 mA
Operating temperature range
-30°C to +99°C
Nonlinearity error
max. 0.2°C
Supply voltage sensitivity
max. 0.1°C/V
Repeatability
max. 0.2°C
Long term drift
max. 0.1°C
Output frequency
1 to 4 kHz
Duty cycle
0.320 (0 °C), 0.00470 °C
Evaluation
Analog
Cable length
5 m

PESSL INSTRUMENTS IR TEMPERATURE

IRTEMP

Order number: 600131 / 900066 

The infrared temperature sensor infers the temperature from a portion of thermal radiation (blackbody radiation) emitted by the object being measured. It is a non-contact temperature sensor. By measuring the amount of infrared energy emitted by the object and its emissivity, the object‘s temperature can be determined. Main use: canopy or leaf temperature measurements.

FEATURE VALUE
Sensor
Melexis MLX90614-BCC
Resolution
0.1 °C
Interface
RS 485 PI Sensor Bus
Size
20 mm (dia) x 24 mm
Sensor housing
Weather resistant PAS
Range
-40 °C to +85 °C
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