Description
- Monitoring of Vitamin D production in IU/min
- Monitoring of UV lamp intensity and aging
- Comparison of sources in terms of Vitamin D production
- Measurement of sunlight intensity in relation to Vitamin D production
| Modell: | 6.4 |
| Output range: | 0-1999 IU/min |
| Measurement range: | 280-400 nm Diffey erythemal action spectrum |
| Resolution: | 1 IU/Min |
| Conversion speed: | 3.0 displays /Sek. |
| Display: | 3.5-digit LCD |
| Digit size: | 10,2 mm high |
| Operating temperature: | 0°C – 37,8°C |
| Operating humidity: | 5% – 80% |
| Accuracy: | ±10% REF.NIST |
| Dimensions: | L: 61 x W: 22 x H: 108 mm |
| Weight: | 150 g |
| Operating Voltage: | 9 V (Block Battery) |
| Lens: | UV glass with diffuser |
| Diffusor: | Teflon |
Sensor:
Silicon carbide (SiC) photodiode with interference filter and Teflon in UV glass diffuser cap.
Operating the meter:
This device is designed to measure both outdoor solar radiation and indoor UVR exposure. The sensor/detector response follows the effective irradiance (Eeff) of the Diffey Erythemal Action Spectrum (EAS) and thus remains accurate for different spectral power distributions. Eeff is used here as a surrogate for vitamin D action spectrum weighted irradiance (Deff), which is very similar but cuts off at 330 nm. Spectroradiometer tests have shown that Eeff and Deff are practically linearly proportional outdoors ± ~4 hours from midday and indoors for most commonly used UVR lamps.
The battery operating voltage is adjustable from 9 V down to 6.5 V. Below 6.5 V, the numbers on the LCD display begin to fade, indicating the need for a battery replacement. With typical usage, a standard 9V battery lasts about 2 years.
The formula constants embedded in the UTILITY conversions of meter readings with IU and Eeff dose rates are:
1000 IU = 1 Med.
1 IU/min = 1/1000 Med/min (or 0.06 Med/hr, i.e. 1/16.67 MED/hr)
1 Med/hr = 2.33 UVI and 1 Med/hr = 16.67 IU/min.
Correct use of the Solarmeter®:
For the occasional user looking for about 1000 IU from face/arm irradiation, there is no need to use the table parameters.
Simply point the meter at the UV source and divide the reading by 1000 for the minutes of irradiation. That’s it. Cautionary note: If you have a white skin type 2 (usually burns, sometimes tans), start with 50-75% of the calculated minutes until your tolerance to UV radiation increases after about 4 exposures. If you are a higher skin type and/or have a base tan, you will make less than 1000 IU.
Care and maintenance:
- Do not expose the measuring device to extreme temperatures, moisture, shocks or dust. If the device is accidentally exposed to excessive humidity or wet conditions, unusually high readings may occur. If you allow the device to dry naturally or place it in a bag with silica gel, normal function will be restored.
- Use a very soft cloth to clean the meter. Keep the sensor free from oil, dirt, etc.
