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■ Developed colorimetric sensor element, small size（43×17×4mm）, easy to use, reusable, highly accurate and applicable for Passive diffusion sampling. ■ Portable base unit device equipped with photoelectric photometry reading function of absorbance change induced in the sensor. ■ Sensor assy itself can work as stand-alone passive sampler, and it's reusable. ■ Base unit with the sensor inserted can work as on-site monitor for short-term（30min/1h）sampled measurement and continous monitoring for time series variation. |
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Sensor element employs the chemical reaction between formaldehyde and β-diketone on a porous glass. The concentration of Rutidine derivatives with yellow color is formed in proportion to multiplication by concentration of formaldehyde and duration of exposure. The difference of absorbance is measured by radiating a certain constant wavelength light, by absorptiometric method, and it is converted into concentration by above multiplication. The technology developed by NTT Energy and Environment Systems Laboratories is used.
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| Base unit can be set on the tripod as shown. Sensor assy itself can be used as a sampler. Hang the sensor from a string. | |
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Example for Samplers Measurement. (Sensor assy with diffusing filter) |
Example for Direct or Continuous Measurement. (Base unit set on tripod stand) |
Model Name |
FMM-MD |
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Detection Principle |
Photoelectric Absorptiometric |
Detection Range |
20 - 1,000 ppb |
Accuracy |
+/- 10% *at 40, 80, 160ppb |
Resolution |
1ppb |
Concentration Unit |
ppb or μg/m3 |
Display |
Digital LCD |
Sampling Method |
Passive diffusion sampling |
Operating Temp. and RH |
-10 - 40°C (14 - 104°F), 20-90%RH(No dew condensation) |
Memory |
up to 250 sensors and 4500 data |
Power Source |
2 x AA size Alkaline batteries, or AC adaptor |
Standard Accessories |
Sensor Assy x 5 pcs, carrying case, |
Option |
(for replacement)Sensor element (5 pcs/set) |
