Order #: FM-120-RENT2
Mfg #: FM-120-RENT2
Droplet Measurement Technologies FM-120 for Rent, Fog Meter
Order #: FM-120-RENT2
Mfg #: FM-120-RENT2
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Product Highlights
A popular all-weather optical spectrometer that continuously measures particles in the 2 - 50 µm range.
Advantages
The FM-120 uses state-of-the-art technology to size particles under a wide range of conditions. Its design offers the following state-of-the-art features:
- Nickel-coated optical flow block to prevent static build-up
- More robust electronics, with digitized signals from the photodetectors
- Universal voltage input for analyzer head
- Particle-by-particle data (optional feature)
- Dynamic thresholding feature to account for small drifts in baseline signal
- Raw data available for one particle in each sampling instance, information that serves as an important instrument diagnostic
How it Works
The FM-120 is a forward-scattering optical spectrometer. For accurate sizing, the FM-120 accepts and sizes only particles that pass through a region of the laser beam with uniform power. This region of the laser is called the depth of field. As particles pass through the laser beam, light scatters in all directions. The FM-120 collects forward-scattered photons within an annular cone that is approximately 3.5° to 12° from the laser beam. The collected light is then directed onto a 50/50 optical beam splitter and finally to a pair of photodetectors, referred to as the sizer and the qualifier (see figure). There is a mask in front of the qualifier detector to define the depth of field. The edge of the depth of field is defined by the points where half of the light scattered from a particle is blocked by the mask. The photodetectors then convert the photon pulses into digital pulses. If the qualifier pulse is greater than half the sizer signal, the particle is deemed within the depth of field. The particle is then sized based on the amplitude of the sizer pulse.
Parameter | Specification |
---|---|
Measured Parameters | Single-particle forward light scattering |
Auxiliary Parameters | Temperature Pressure |
Derived Parameters | Particle diameter Particle number concentration Liquid water content (LWC) Median volume diameter (MVD) |
Particle Size Range | Droplets with 2-50 µm diameter |
Number of Size Bins | 30 |
Typical Sample Area | 0.24 mm² |
Sample Flow Volume | 1 m3/min |
Sampling Frequency | Standard Data Rate: Selectable, 0.04 sec to 20 sec PBP Data Rate: No limit until particles are coincident |
Refractive Index | Non-absorbing, 1.33 (the industry standard for water) |
Light Collection Angles | ~3.5° - 12° |
Data System Interface | RS-232 or RS-422 serial interface Up to 460 kB |
Calibration Verification | Precision glass beads |
Software | Particle Analysis and Display System (PADS) software, included |
Environmental Operating Conditions | Temperature: 0 to 40 °C Relative Humidity: 0 - 100%, non-condensing Altitude: 0 - 4,000 meters |
Weight | 10.0 kg (instrument), 9.5 kg (pump) |
Probe Dimensions | 23 cm H x 28 cm W x 37 cm L |
Power Requirements | Universal input for analyzer head, 50-60 Hz 115-120V or 230V for pump (set at factory, but user-configurable) 200W (instrument), 400W (pump) |
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