MEASURING PAR IS CRITICAL - Measuring the PAR levels of your grow lights is one of the most critical measurements in the precision growing of plants and other photosynthetic organisms in greenhouses, growth chambers, farms, gardens, and aquariums. Our underwater original quantum meters are specifically designed to measure the intensity of sunlight, MH, and HPS lights underwater for biological, chemical, and physical processes in natural waters and aquariums.
UNDERWATER ACCURACY - Underwater PAR measurements can read low when a sensor is calibrated for air. This applies an immersion effect correction factor to get accurate measurements underwater by combining the intensity of all photons between 400-700 nm under sunlight, MH, and HPS lights to give a single PAR reading within 5 % uncertainty. Unlike hobby-grade PAR meters that may be accurate when new, but quickly lose calibration, our meters are stable with a drift rate of less than 2% per year.
FOR SCIENTISTS & SERIOUS GROWERS - Unlike cheaper LUX or footcandle sensors which are sometimes marketed as grow light meters, but are meant for measuring light for human vision, our meters feature a laboratory-grade photosynthetic photon flux density (PPFD) optical detector precisely calibrated to measure the light intensity in µmol m-2 s-1 of the specific color wavelengths emitted by sunlight, MH, and HPS lights that are used by plants for photosynthesis.
RUGGED & EASY TO USE - Quantum sensor head is machined aluminum and potted solid with epoxy for years of use in harsh environments, especially in saltwater or freshwater. The handheld meter is attached by a cable and displays real-time readings, records samples, and logs average intensity and daily light integral (DLI) measurements. Unlike the sensor head, the handheld meter is not waterproof.
THREE MEASUREMENT MODES - The meter has a spot measurement, sample, and log mode and will record an integrated daily total in mol m-2 s-1. Sample mode will record up to 99 manual measurements and log mode will power the meter on and off to make a measurement every 30 seconds. Every 30 minutes, the meter will average the sixty 30 second measurements and record the averaged value to memory, up to 99 averages. Once full, it will overwrite the oldest measurements with new ones. A daily light integral will be recorded from the 48 averaged measurements for a day’s worth of readings and is downloadable via Apogee AC-100 cable and used with the included ApogeeAMS software.
Specifications
Calibration Uncertainty
±5%
Measurement Repeatability
Less than 1%
Long Term Drift (Lack of Stability)
Less than 2% per year
Non-Linearity Less than
1% (up to 3000 µmol mˉ² sˉ¹)
Response Time
Less than 1 ms
Field of View 180˚
Spectral Range 370 to 650 nm
Directional (Cosine)
Response ±5% at 75˚ zenith angle
Temperature Response -0.04% per C
Operating Environment 0 to 50 C; Less than 90% RH non-condensing up to 30 C; Less than 70% RH non-condensing from 30 to 50 C; The stand-alone sensor can be submerged in water to depths of 30 m
Meter Dimensions
126 mm long, 70 mm wide, 24 mm high
Sensor dimensions
24 mm diameter, 33 mm high
Weight
180 g
Cable
2 m two-conductor, shielded, twisted pair cable with TPR sheath (high water resistance, high UV stability, flexibility in cold conditions)
Warranty
4 years against defects in materials and workmanship
Manufactured
Assembled in the USA
