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Enabling better global research outcomes in soil, plant & environmental monitoring.

MU-200 Portable Separate UV Meter

The Apogee MU-200 Portable Separate UV Meter is designed for quick and convenient measurements of UV radiation in the wavebands between 250 and 400nm. These wavebands cover UV-C, UV-B and UV-A. The MU-200 sensor is separated from the handheld meter by a 2m long cable. UV sensors can be used to measure the light intensity whether the source is the sun, fluorescent lights, germicidal lamps or other sources of UV radiation. Low levels of UV light have a positive effect on plant growth and seed germination but higher levels can be harmful and even toxic.

Apogee UV sensors incorporate a photodiode that measures combined UVA and UVB radiation. The MU-200 has a separate sensor while the handheld meter displays and stores measurements. The meter offers a setting to measure UV in µmol m-2 s-1 or Watts m-2

• Measures combined UVA and UVB radiation
• Self-cleaning, dome-shaped head
• Measure UV filtering of various materials
• Test UV stability of products
• Available in sensor-only version with pigtail leads (for dataloggers) or with handheld meter
• Custom options available
• Four year warranty
Calibration Uncertainty: ± 10%
Measurement Repeatability: < 1%
Non-stability (Long-term Drift): < 3% per year
Non-linearity: < 1% (up to 3000 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: 0 to 50°C, < 90% non-condensing relative humidity up to 30°C, < 70% non-condensing relative humidity from 30 to 50°C, Separate sensors can be submerged in water up to depths of 30m
Meter Dimensions: 12.6cm length, 7.0cm width, 2.4cm height
Sensor Dimensions: 2.4cm diameter and 2.8cm height
Mass: 180g
Cable: 2m of shielded, twisted-pair wire, Santoprene rubber jacket
Apogee Instruments MU series meters measure ultraviolet radiation between 250 and 400 nm in micromoles of photons per square meter per second. Although the UV radiation between 280 and 315 nm (UV-B) is critically important in photochemical and photobiological reactions, less than 3% of the UV photons are in this range. Because only a small fraction of the photons are in the UV-B range, the MU series meters cannot be used to selectively measure UV-B radiation. The MU series is sensitive to UV-B radiation, but it is included with the UV-A radiation to provide a total measurement of UV radiation. In addition to naturally occurring UV radiation from the sun, there are many electric light sources that emit UV radiation (e.g., cool white fluorescent, metal halide, mercury arc, and germicidal lamps). Although the relative wavelengths of UV radiation differ among sunlight and electric lights, the error estimates shown in the table below indicate that the MU series meters provide reasonable estimates of UV radiation coming from electric lamps (table provides spectral error estimates for UV radiation measurements from radiation sources other than clear sky solar radiation). For common lamps, the error is less than 10%. The MU series meters are particularly useful for determining the UV filtering capacity of the transparent plastic and glass barriers that are commonly used below electric lamps.