The MQ-620 has a hand-held meter, attached via cable, that displays and stores measurements. The sensor features a rugged, aluminum housing that is fully-submersible and built to withstand harsh conditions. Typical applications of Extended Range PFD sensors include incoming PFD measurements over plant canopies in indoor greenhouses or in growth chambers, and reflected or under-canopy (transmitted) PFD measurements in the same environments. Since the detector on this particular Extended Range sensor is sensitive to radiation with wavelengths up to 1100 nm, beyond the range of wavelengths that influence plants, we recommend only using the SQ-620 sensors in indoor grow environments utilizing LED lights.
The meter has a sample and log mode, and will record an integrated daily total in mol m-2 d-1. Sample mode will record up to 99 manual measurements. Log mode will power the meter on/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. The meter can store up to 99 averages, once full it will start to overwrite the oldest measurement with new ones. An integrated daily total will be recorded from the 48 averaged measurements (making a 24 hr period). Sample and log measurements can be reviewed on the LCD display or by downloading the data to a computer, however, the integrated daily total can only be viewed by downloading the data to a computer. Downloading data to a computer requires the AC-100 communication cable (a standard USB cable will not work) and ApogeeAMS software.
Calibration Uncertainty
: ± 5 %
Measurement Range: 0 to 4000 µmol m-2 s-1
Measurement Repeatability: Less than 0.5 %
Long-term Drift (Non-stability): Less than 2 % per year
Non-linearity: Less than 1 % (up to 4000 µmol m-2 s-1)
Response Time: Less than 1 ms
Field of View: 180°
Spectral Range Directional (Cosine) Response: ± 2 % at 45° zenith angle, ± 5 % at 75° zenith angle Azimuth Error Tilt Error: Less than 0.5 % Temperature Response: -0.11 ± 0.04 % per C Uncertainty in Daily Total: Less than 5 % Housing IP Rating: IP68 Operating Environment: -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m Meter Dimensions: Sensor Dimensions: 30.5 mm diameter, 37 mm height Mass: 140 g (with 5 m of lead wire) Cable: 2 m of two conductor, shielded, twisted-pair wire; additional cable available; TPR jacket Warranty
: 340 to 1040 nm ± 5 nm (wavelengths where response is greater than 50 %)
: Less than 0.5 %
: Anodized aluminum body with acrylic diffuser
126 mm length, 70 mm width, 24 mm height
: 4 years against defects in materials and workmanship
