The PQ-500 package includes an SQ-500 Full-spectrum Quantum sensor with a 30cm cable and microCache Bluetooth micro-logger. Alternatively, the PQ-510 package has 2 metres of cable. These promotional packages are at a special introductory price. When paired, the micrologger and the quantum devices are a powerful tool for monitoring photosynthetically active radiation with research-grade accuracy for optimal plant growth.
The SQ-500 sensor is a trusted industry standard for making accurate PPFD measurements.
The new AT-100 microCache (µCache) micro-logger is a rugged, standalone, battery-powered device that can collect over 400,000 data points and connects your sensor to your iOS or Android device via Bluetooth using our ApogeeConnect app.
The app allows you to make real-time measurements, set custom datalogging intervals, monitor and graph daily lights integrals, measure photoperiods, download datasets, and more.
Alternatively, the PQ-510 package is supplied with a 2 metre length of connection cabling.
Measuring PAR with the Apogee µCache Logger
The SQ-500 is a self-powered, analog full-spectrum quantum sensor with a 0 to 40 mV output. Radiation that drives photosynthesis is called photosynthetically active radiation (PAR) and is typically defined as total radiation across a range of 400 to 700 nm. PAR is often expressed as photosynthetic photon flux density (PPFD): photon flux in units of micromoles per square meter per second (µmol m-2 s-1, equal to microEinsteins per square meter per second) summed from 400 to 700 nm (total number of photons from 400 to 700 nm).
Sensors that measure PPFD are often called quantum sensors due to the quantized nature of radiation. A quantum referes to the minimum quantity of radiation, one photon, involved in physical interactions (e.g., absorption by photosynthetic pigments). In other words, one photon is a single quantum of radiation. Apogee Instruments SQ series quantum sensors consist of a cast acrylic diffuser (filter), photodiode, and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device. Sensors are potted solid with no internal air space. The range of SQ-500 series quantum sensors are designed for continuous PPFD measurement in indoor and outdoor environments:
How to Choose a Quantum Sensor
Apogee microcache with Quantum Sensor Quickstart Guide
|Communication Protocol||Bluetooth® Low Energy (Bluetooth 4.0+)|
|Bluetooth Range||approx. 45 m (line-of-sight)|
|Data Logging Capability||Averaging Interval: 1-60 minutes
Sampling Interval: ≥ 1 second
|Data Log Capacity||Over 400,000 Entries (approx. 9 months at a 1-minute logging interval)|
|Time Accuracy||± 30 seconds per month at 0° C – 70° C|
|Battery Type||2/3 AA 3.6 Volt Lithium Battery|
(impacted by sampling interval
and amount of time connected to a mobile app)
|approx. 1 year w/ 10-second sampling interval and an average of 5 minutes daily connected time
approx. 2 years w/ 60-second sampling interval and an average of 5 minutes daily connected time
|Operating Environment||-40 to 85 C|
|Dimensions||66 mm length, 55 mm width, 18 mm height|
|ADC Resolution||24 bits|
|Output (Sensitivity)||0.01 mV per µmol m-2 s-1|
|Output Type||0 to 40 mV|
|Calibration Factor (reciprocal of sensitivity)||100 µmol m-2 s-1 per mV|
|Calibration Uncertainty||± 5 %|
|Measurement Repeatability||Less than 0.5 %|
|Long-term Drift per Year||Less than 2 % per year|
|Non-linearity||Less than 1 % (up to 4000 µmol m-2 s-1)|
|Response Time||Less than 1 ms|