Pessl Instruments OEM Sensors

Pessl Instrument Air Temperature & Relative Humidity Sensor

temp-rel-hum-2026

Order number: 600018 

This fully calibrated sensor delivers high-precision, high-accuracy air temperature, and relative humidity measurements based on the Sensirion SHT45 sensing element. It offers fully calibrated digital output via I2C, UART (HC2) and RS485 (with PI-Bus protocol), low power consumption, and long-term stability, making it well suited for demanding IoT and outdoor deployments. Dew point, VPD and delta T calculations available. 

Recommended cable length: no longer than 1 m in the case I2C and UART output. Or longer cable optionally for RS485 outputs. 

FEATURE VALUE
Temperature sensor
Sensirion SHT45
Operating temperature range
-40 °C to +125 °C
Temperature accuracy
typ. 0.1 °C (from 0 °C to +60 °C) up to 0.2 °C
Temperature resolution
0.01 °C
Long-term temperature drift
< 0.03 °C / year
Humidity range
0 % to 100 % RH
Relative humidity accuracy
typ.+/- 1 % RH (from 20 % to 70 %) up to 1.5 % RH
Relative humidity resolution
0.01 % RH
Long-term relative humidity drift
< 0.2 % RH / year
Operating voltage
1.08 – 3.6 V
Storage temperature range
-40 °C to +150 °C (Sensor)
Digital interface
HC2 output:
*Optional RS485 with PI-Bus protocol
*Optional I2C
Filter
PTFE (provides the protection from particles and enables sensor operation in harsh conditions)

Radiation Shield

temp-rel-hum-2026-2 (1)

Order number: Upon request

Radiation shield for air temperature and relative humidity sensor, protects it from direct solar radiation and precipitation to ensure accurate measurements. 

Pessl Instruments Water Level Sensor

water level sensor

Order number: On request

The PI Water level sensor is an accurate and cost-effective submersible water level sensor that can be connected to METOS stations. Default pressure range is from 0 up to 2 Bar with a precision of 0.15 mBar. Sensor resolution and cable length can be adjusted on request. Sensor comes with a special cable which contains air ventilated tube for surface pressure compensation.

SECTORS: Depth or level measurement in wells and open waters (rivers and lakes) and ground water level measurement.

FEATURE VALUE
Range
0 to 2 Bar
Resolution
1 mm
Precision
0.15 mBar
Resolution
1 mm
Sensor
Metallux CPS 2184
Material
Stainless steel
Dimensions
Diameter: 3 cm, Length: 11 cm + cable
Weight
0.35 kg + cable
Cable length
10 meters, other lengths on request
Calibration
Precalibrated from the factory, optional manual calibration via METOS 5 terminal menu

PI Stremoclip sensor

Stremoclip

Order number: 600250 (METOS 5, IMT, µMETOS)

The PI StremoClip Sensor is a lightweight, non-invasive sensor for direct measurement
of plant physiological activity. It is designed to be mounted directly on the leaf surface, enabling real-time monitoring of transpiration and stomatal behavior.

PI StremoClip sensor consists of 2 clips and 1 interface box. Clips are connected to the interface box with 1 meter cable and the interface is connected to the weather station with 3 meter cable.

FEATURE VALUE
Dimensions without cable
28.3 mm x 50 mm
Weight with cable and Pg7 and Pancon
28 g
Cable length
1 meter
Capacitance
between 100 to 300 pF

PESSL INSTRUMENTS WIND SPEED

Order number: 600247

PI mechanical Wind Speed Sensor is a durable, cup-type anemometer designed for
dependable wind speed measurement in agricultural and outdoor environments.
Its proven three-cup design ensures stable and accurate readings even in changing
weather conditions, helping farmers and system integrators reliably monitor
average wind speed over a defined period for irrigation control, crop protection,
weather stations, and farm management systems.

FEATURE VALUE
Range
0 to 30 m/s, structural integrity up to 60 m/s
Tolerance
≤5 m/s: ±0.5 m/s
>5 m/s: ±10%
Sensor
Three hemispherical 40 mm wide cups, on 12 cm diameter wheel
Turning Factor
75 cm for one full rotation
Threshold
1.1 m/s
Sensor output
AC sine wave signal induced by rotating magnet on cup wheel shaft.
Output frequency
1 cycle per cup wheel revolution. 0.75 m/s per Hz
Dimensions
Height: 23 cm, Width: 11 cm
Weight
0.28 kg
Cable length
3 meters, shielded, UV and water resistant
Calibration
Precalibrated from the factory, optional manual calibration via METOS 5 terminal menu

Pessl Instruments Wind Direction sensor

Order number: 600246

The Pessl Instruments Wind Direction sensor provides reliable and precise measurement of wind direction for agricultural and other outdoor applications. Its balanced wind vane design ensures stable alignment with airflow even at low wind speeds, delivering accurate directional data across the full 360° range. The sensor comes pre-calibrated from factory, and METOS 5 supports additional calibration by the installer on the final installation location.

FEATURE VALUE
Range
0 to 359 Degrees
Tolerance
5 Degree
Sensor
Wind vane with counterweight
Turning point
Minimum 1.1 m/s
Dimensions
Height: 27.5 cm, Width: 21.5 cm
Weight
0.40 kg
Cable length
3 meters, shielded, UV and water resistant
Calibration
Precalibrated from the factory, optional manual calibration via METOS 5 terminal menu

PESSL INSTRUMENTS RAIN GAUGE

Precipitation sensor

Order number: 600169 

The mechanic consists of a magnet, which moves past a reed switch and opens or
closes the circuit. The double spoon tips left or right and does not lose any water
due to a very fast switching mechanics. The resolution with a surface of 200 cm2 is
0.2 mm, while the resolution with the 80 cm2 is 0.5 mm. Heating for rain gauge can
also be included.

ADD BIRD SPIKES

Protect your rain gauge from bird entry with the use of the green crown with bird spikes (Order number: 600251).

FEATURE VALUE
Sensor Type
Double tipping bucket rain gauge
Output
Switch signal
Switch
Reed contact, solid state
Sensitivity
1 tip per 0.2 mm or 1 tip per 0.5 mm
Collector Surface
200 cm2
Evaluation
Digital
Maximum Rain
12 mm/minute
Dimensions
159.6 mm (6.28”) diameter x 160 cm (6.3”) H
Catch surface size
200 cm2 (31 square inch)
Cable length
60 cm (23.62”)
Accuracy
±5%

PESSL INSTRUMENTS LEAF WETNESS

Leaf wetness

Order number: 600015 (METOS 5 / µMETOS / IMT); 600188 (nMETOS – LoRAIN)

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 PYRANOMETER

PI_Pyranometer

Order number: 600021 (µMETOS), 600035 (IMT), 600036 (METOS 5)

The IM506D Pyranometer is designed for field measurements of global solar radiation in agricultural, meteorological and solar energy studies. In clear, unobstructed daylight, the Pessl Instruments pyranometer has favourable results compared to the first class thermopile-type pyranometers, but is priced at just a fraction of the cost.

FEATURE VALUE
Sensor
VTB1112H
Calibration
Calibration against Kipp & Zonen CMP3 under daylight.
Absolute error max. 5%, typically 3%
Stability
2% drift on 2-year use
Time to measure
10 µs
Temperature dependency
0.15% per °C
Cosines correction
Sensor corrects up to 80° degrees
Azimuth
1% error over 360 degree at 45 degree elevation
Operating temperature range
-20°C to 65°C
Operating relative humidity range
0 to 100%
Sensor
Photodiode
Housing
Weatherproof PAS case with acrylic diffuser, stainless steel hardware
Size
35 mm diameter, 45 mm height
Weight
114 g
Evaluation
Pulse Wide Modulation 0-80% = 0-2000 W/m²
Spectral range
300-1100 nm

PESSL INSTRUMENTS SOIL MOISTURE SENSOR PI54-D

PI54-D

Order number: 600118 

The PI54-D soil moisture sensor has a larger volume of influence. It determines volumetric water content (VWC) by measuring the dielectric constant of the soil using capacitance technology and soil temperature. It is 10 cm long and thus measures 1 liter of soil, while high frequency minimizes salinity and textural effects which makes PI54-D accurate in most soils.

FEATURE VALUE
Volumetric water content (VWC)
Range: 0−0.57 m3/m3 (0%−57% VWC)
Resolution: 0.0008 m³/m³ (0.08% VWC) in mineral soils from 0−0.50 m³/m³ (0%−50% VWC)
Accuracy: With standard calibration equation, 0.03 m³/m³ (3% VWC) typical in mineral soils that have solution electrical conductivity <10 dS/m
NOTE: With soil-specific calibration, ±0.02 m³/m³ ( ±2% VWC) is typical in any soil.
Dimensions
16.0 cm (6.3 in) length; 3.3 cm (1.3 in) width; 0.8 cm (0.3 in) height
Prong length
10 cm (3.94 in)
Cable length
5 m or 10 m
Supply voltage (VIN to GND)
Minimum: 3.6 VDC at 12 mA
Maximum: 15 VDC at 20 mA
Measurement duration
Maximum 10 ms
Temperature accuracy
-+0.3°C in the soil temperature (range -5°C to +25°C approx.)
Output
Digital

PI-Profile Probe

Pi Profile Probe Manual page (1)

Order number: 600196  (60 cm) / 600197 (90 cm)

The PI-Profile Probe system is ideal for broad-acre row crops like corn, cotton, alfalfa and soybeans as well as all permanent crops. Due to its special design where the sensor and the cable are trenched below the surface there is no need for annual installation and removal of soil sensors from the field.
The sensor comes with a 5-meter cable and watertight rapid connector so the In-field telemetry can be removed only during tillage, seeding or harvest and moved back in after that. Highly scalable with a low total cost of ownership; no annual installation and removal! The PI-Profile Probe is available with 60 cm and 6 sensors (every 10 cm) and with 90 cm and 6 sensors (every 15 cm)
which measures soil moisture and soil temperature in the vertical profile.

FEATURE VALUE
Probe lengths
from 60 cm to 90 cm
Probe diameter
25 mm
Number of sensors
6
Separation of sensors
60 cm probe: one sensor every 10 cm
90 cm probe: one sensor every 15 cm
Soil moisture range & accuracy
0-100% (mm). Accurate to within 1% V/V
Soil temperature range & accuracy
Soil temperature probe reading resolution: 0.0625°C
Soil temperature probe reading accuracy: within 1°C in range 0°C to +64°C
General temperature range that can be used: 0°C to 64°C
Method
FDR
Influence of salinit
Less than 1% over standard operating range
Environment
-15°C to 60°C air temperature; 0 to 90% relative air humidity
Storage
0°C to 65°C air temperature; 0 to 90% relative air humidity
Do not store in direct sunlight. Do not exposed to strong radiometric radiation (i.e. cell phone signal)
Cable length
5 m