The PiloTREK W–200 Series is an 80 GHz non-contact, radar level transmitter with advanced measurement technology for liquids, emulsions, and other media. PiloTREK W-200 is ideal for use in food and beverage production, the energy sector, pharmaceutical manufacturing, chemical plants, and marine applications as this level transmitter can provide measurement results with mm of accuracy.
This non-contact level transmitter from Nivelco is also excellent for measuring substances prone to vapor formation and liquids with gas cushions. In addition to the level, volume, and weight measurement functions, the PiloTREK W-200 Series also offers open-channel flow measurement functions and threshold functions to eliminate flexible and interfering echoes commonly seen in ultrasonic devices. These transmitters can also be used in a vacuum since a medium is not required for millimeter waves to propagate. The device can also be operated with HART compliant NIVELCO EView2, MultiCONT universal process controller, and PACTware software.
The reflection of the millimeter-waves is highly dependent on the dielectric constant of the medium. Therefore, the measured medium’s dielectric constant (εr) must be over 1.9 for millimeter-wave level measurement. The measurement principle of a level transmitter with a millimeter-waves signal is based on measuring the reflection’s time of flight.
The speed of propagation of millimeter-waves signals in the air, gases, and vacuum is almost constant regardless of temperature and medium pressure. So the measured distance does not depend on the physical parameters of the intermediate medium. The PiloTREK W–200 level transmitter is a continuous-wave frequency modulated radar (FMCW) operating at 80 GHz (W-band).
The most obvious advantages of 80 GHz radars over lower frequency (5-12 & 25 GHz) radars offer a smaller antenna size, better focus, and smaller beam angle. A portion of the millimeter-wave continuous wave energy radiated by the level transmitter antenna is reflected from the measured surface, depending on the material to be measured. The distance of the reflecting surface is calculated with high accuracy by the electronics from the frequency shift of the reflected signal and converted into a distance, level, or volume signal by the electronics.
| Butane | 1.4 | Grain | 3-5 |
| Cement | 1.5-10 | Cooking Oil | 3.9 |
| LPG | 1.6-1.9 | Limestone | 6.1-9.1 |
| Kerosene | 1.8-2.1 | Acetone | 21 |
| Crude Oil | 2.1 | Ethanol | 24 |
| Diesel | 2.1 | Methanol | 33.1 |
| Gasoline | 2.3 | Glycol | 37 |
| Asphalt | 2.6 | Nitrobenzene | 40 |
| Clinker | 2.7 | Water | 80 |
| Resin | 2.4-3.6 | Sulfuric Acid (T=68˚F [20˚C]) | 84 |
MultiCONT multichannel process controllers process and display measurement data supplied by NIVELCO HART equipped transmitters in a Multidrop loop. Connected transmitters can be programmed through MultiCONT, and it can also perform data gathering duties. Processed data may be sent to a computer via RS485 and displayed in NIVISON. MultiCONT provides the means to optimize and configure measurements and display the echo maps of the particular installations.
Instruments with HART connectivity can be linked to a PC via Bluetooth using a UNICOMM HART–USB-Bluetooth modem (SAT–504). The USB power bank connected to the UNICOMM modem can power the entire setup.
| Supply Voltage | 12 to 36 V DC |
|---|---|
| Ambient Temperature | –40 to 176 °F |
| Process Temperature | –40 to 176 °F |
| Process Pressure | –14.5 to 43.5 psi (–0.1 to 0.3 MPa) |
| Measuring Range | 0 to 98.5 ft |
| Output | 4 to 20 mA + HART, optional SPDT output, service interface |
| Process Connection | 1″, 1.5″ BSP / NPT |
| Ingress Protection | IP68 |
| Approvals | ATEX (pending) |
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