The SNiP-UV is a 'Sensor Node Integrated Package' for LoRaWAN communication of real-time measurements of UVA and UVB, for continuous environmental monitoring.
The SU-100 Ultraviolet Sensor incorporates a photodiode that measures combined UVA and UVB radiation. Typical applications of UV sensors include incoming UV radiation measurement in outdoor environments or in laboratory use with artificial light sources (e.g. germicidal lamps).
Further parameters can be added to the SNiP without requiring loggers to match each distinct sensor, substantially reducing the cost of getting a fuller picture on the application.
Ultraviolet (UV) radiation constitutes a portion of the electromagnetic spectrum from 100 to 400 nm, and is further subdivided into three wavelength ranges: UV – A (315 to 400 nm), UV – B (280 to 315 nm) and UV – C (100 to 280 nm). Much of the UV – B and all of the UV – C wavelengths from the sun are absorbed by the Earth’s atmosphere . There are also many artificial UV light sources available that output a selective wavelength range or offer a broadband UV radiation source.
Most UV sensors designed for sunlight measurements are sensitive to UV radiation in the UV – A and UV – B ranges. Apogee Instruments SU-100 UV sensors detect UV radiation from 250 to 400 nm and are calibrated in photon flux units of micromoles per square meter per second (µmol m-2 s-1). The output can also be expressed in energy flux units of watts per square meter (W m – 2, equal to Joules per second per square meter). Typical applications of UV sensors include incoming UV radiation measurement in outdoor environments or in laboratory use with artificial light sources (e.g. germicidal lamps).
Apogee Instruments SU-100 UV sensors consist of a photodiode and signal processing circuitry mounted in an anodised aluminium housing, and a cable to connect the sensor to a measurement device. Sensors are potted solid with no internal air space, and are designed for continuous UV radiation measurement in indoor or outdoor environments. The SU-100 outputs an analogue voltage that is directly proportional to UV radiation incident on a planar surface (does not have to be horizontal), where the radiation emanates from all angles of a hemisphere.
The AD-NODE is designed for those requiring precision in their analogue and digital measurements. With a 24-bit ADC, the AD-NODE supports two RTDs, a 0–10V with compressing range and a 4–20mA input. Each of the four dry-contact digital inputs is capable of simultaneously sampling at 1 kHz, with periodic reporting. Settings on the device can be altered remotely via LoRaWAN™ or locally via USB.
Apogee UV sensors incorporate a photodiode that measures combined UVA and UVB radiation. The sensor housing design features a fully potted, domed-shaped head making the sensor fully weatherproof and self-cleaning.
|Sensitivity:||0.2 mV per µmol m-2 s-1, 0.58 mV per W m-2|
|Calibration Factor:||5.0 µmol m-2 s-1 per mV (reciprocal of sensitivity), 1.65 W m-2 per mV (reciprocal of sensitivity)|
|Calibration Uncertainty:||± 10%|
|Measurement Repeatability:||± 1%|
|Non-stability (Long-term Drift):||< 3% per year|
|Non-linearity:||< 1% (up to 300 µmol m-2 s-1)|
|Response Time:||< 1 ms|
|Field of View:||180°|
|Spectral Range:||250 nm to 400 nm|
|Directional (Cosine) Response:||± 10% at 75° zenith angle|
|Temperature Response:||approximately 0.1% per °C|
|Operating Environment:||-40 to 70°C, 0 to 100% relative humidity|
|Dimensions:||2.4 cm diameter and 2.8 cm height|
|Mass:||75g (with 5m of lead wire)|
|Cable:||5m of shielded, twisted-pair wire. Santoprene rubber jacket|