Apogee Instruments, Inc.
Manufactures innovative instrumentation for the biological sciences.
- (435) 792-4700
- (435) 787-8268
- sales@apogee-inst.com
- 721 W 1800 N
Logan, UT 84321
United States
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Chlorophyll Concentration
Linear OutputThe Apogee chlorophyll concentration meter is calibrated to measure chlorophyll concentration in leaves with units of mol of chlorophyll per m2. This eliminates the problems with relative indexes of chlorophyll concentration.For reference and comparison purposes, the Apogee meter also outputs relative units [CCI or SPAD] if desired.For details see: Parry, C., Blonquist Jr., J.M., & Bugbee, B. 2014. In situ measurement of leaf chlorophyll concentration: analysis of the optical/absolute relationship. Plant, Cell and Environment 37:2508-2502.
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Infrared Radiometers
Calibrated to a custom black-body cone with a measurement uncertainty of 0.2 C from -30 to 65 C when the sensor (detector) temperature is within 20 C of the surface (target) being measured. Radiometers are only sensitive from 8 to 14 m (atmospheric window) to minimize the influence of water vapor and CO2 on the measurement.
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Net Radiometer
An on-board 24-bit A to D converter makes measurements and provides a digital SDI-12 output. This eliminates the need for multiple analog datalogger channels to measure each of the four components of net radiation.
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Oxygen Sensors
The protective membrane in front of the oxygen sensor can be heated to prevent water from condensing on the membrane and blocking the diffusion path. The heater is typically used when sensors are deployed in soil or compost where relative humidity is close to 100 %.
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Pyrgeometers
Unique DesignDesigned to optimize performance and price. The filter, blackbody thermopile detector, and thermistor (to measure detector temperature) are all contained in a compact housing that provides improved thermal coupling.
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Quantum Sensors
Apogee offers two types of quantum sensors. The Full-spectrum Quantum Sensors feature an improved detector that provides accurate measurements under all light sources, including LEDs, right out of the box. The Original Quantum Sensor is less expensive and great for measuring all light sources except certain LED colors, where post-measurement correction factors need to be applied to achieve accurate readings.
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Spectroradiometers
Apogee offers two types of spectroradiometers. The Field Spectroradiometer was designed for unattended field measurements as well as laboratory measurements. The Lab Spectroradiometer is for laboratory measurements and portable measurements.
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Temperature Sensors
The ST-100 is a high accuracy thermistor ( 0.1 C from 0 to 70 C), mounted in a waterproof housing, designed for continuous measurement of air, soil, or water.
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Underwater Quantum/PAR Sensors
Photosynthetic radiation is essential for the growth of the photosynthetic organisms such as corals. The wavelength range from 400 to 700 nm is PAR (Photosynthetically Active Radiation) or PPFD (Photosynthetic Photon Flux Density). Apogee quantum/PAR sensors are calibrated to measure the number of photons of light across this range.
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UV Sensors
The patented domed shaped sensor head facilitates runoff of dew and rain, helping to keep the detector clean and minimizing errors caused by dust blocking the radiation path. Sensors are housed in a rugged anodized aluminum body and electronics are fully potted.
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Aspirated Radiation Shield
The fan has an ingress protection (IP) rating of 55, virtually eliminating moisture and dust ingress. At full speed the power requirement is 1 W (80 mA at 12 V DC). To conserve power fan speed can be reduced, via pulse width modulation (PWM), to 0.3 W at night or when wind speed is greater than 3 m s-1 without loss of accuracy. If the fan is continuously operated at full speed lifetime is rated at 50,000 hours (5.7 years). The fan includes a tachometer, allowing RPM to be mounted to detect obstruction of the fan.
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Solar Energy, PV Monitoring
Apogee silicon-cell pyranometers feature a monocrystalline silicon-cell detector that has the same spectral response as a PV module. The sensors quantify shortwave radiation being harnessed as electricity.
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Barometric Pressure Sensors
Accurate within 1.5 % across a pressure range of 15 to 115 kPa (4.43 to 34.96 in Hg). Long-term non-stability has been measured continuously indoors and in natural conditions (with sensors mounted inside a datalogger enclosure) for multiple sensors and is less than 0.5 % per year. Temperature effects on signal are less than 1 % across a wide temperature range (-20 to 50 C).
