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Sensors #4532913

Thermistor Temperature Sensors

Measurement Range -50 to 70 C
Measurement Uncertainty 0.1 C (from 0 to 70 C) (ST-100) 0.2 C (from -25 to 0 C) 0.4 C (from -50 to -25 C) 0.2 C (from 0 to
Measurement Repeatability : < 0.05 C

The thermistor temperature sensor is a small thermistor enclosed in a weatherproof housing. It is suitable for measuring air and soil temperatures with a datalogger. The fine-wire thermistor is ideally suited for taking measurements of surfaces or small samples where even a narrow field of view infrared radiometer may not be suitable due to the integration over its conical field of view. The small size also provides a more rapid response to changes in temperature than larger sensors. The sensor is rugged and can be repeatedly pushed into plant tissues with tweezers. The wires are flexible and less sensitive to breakage than similarly-sized fine wire thermocouples.

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Barometric Pressure Sensor

Measurement Range: 15 to 115 kPa (approximate)
Sensitivity: 45.9 mV per kPa; 0.459 mV per 0.01 kPa (approximate)
FEATURES Simple, compact, rugged design, Low power use, less than 50 mW

Apogee barometric pressure sensors combine a wide pressure measurement range, wide operating temperature range, high accuracy, low power use, and low cost into a small, rugged package. These sensors are ideal for continuous barometric pressure measurement on weather stations and providing routine pressure measurements for correction of sensor outputs that are sensitive to barometric pressure fluctuations (for example, Apogee oxygen sensors).

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Infrared Radiometer Sensor

Feature Most accurate infrared radiometer on the market , Measures surface temperature rapidly
Calibrated target temperature range from -30 to 65°C

Apogee Instruments Infrared Radiometers (IRRs) measure surface temperature by converting thermal energy radiated from any surface in its field-of-view (FOV) to an electrical signal with a response time less than 1 second. Each IRR carries an impressive uncertainty of 0.2C at 95% confidence to ensure accurate measurements. The resilient 8-14 m germanium window corresponds to the atmospheric window in order to minimize the effects of water bands below 8 m and above 14 m.

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Light Sensors

FEATURES The quantum sensor suitable to be used in the temperature range of -20oC to +50 oC

The LINPAR is designed for the measurement of Photosynthetically Active Radiation (PAR) within plant canopies. 33 sensors are mounted within a 1 metre anodised "U" section tube. The sensors are covered with a 3mm diffuser providing an integrated reading over 850mm section of the sensor. At the cable end there are no sensors in the first 70mm and in the last 50mm at the distal end to provide for attachment. An integral "bulls eye" levelling sensor is provided. For complete canopy monitoring solutions the LSM-LINPAR can be used with the SFM-1 Sap Flow Meter, PSY-1 Psychrometer and the DRL26 Dendrometer.

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Ravishankar Kumar (Spectra Agritec)
B- 1, B- 2, 3rd Floor, Ashoka Apartment Ranjit Nagar, Commercial Complex, Patel Nagar, Delhi - 110008, India
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