Products non contact radar oil level sensor transmitter range configuration manufacturer
Radar level sensors are typically housed in a single assembly, combining the transmitter and receiver antenna in one device.
The two main types of radar level sensors in use are Air-to-Air Radar (TAR) and Guided Wave Radar (GWR).
Airborne radar level sensors are the most commonly used type because they are non-contact and easier to install. The emitted magnetic waves fan out from the sensor until they hit the surface of the liquid and are reflected back. The main disadvantage of the TAR level sensor is that the electromagnetic pulse energy is attenuated by the longer distance and the lower dielectric process medium. TAR level measurement technology can be used in aggressive chemical applications as it does not come into contact with the fluid being measured.
Guided wave radar types include a waveguide mounted in front of the sensor to focus microwave pulses and boost the reflected wave energy. This makes it possible to use GWR-type sensors with lower dielectric process media that would otherwise degrade the performance of TAR-type sensors.
Radar level sensors are mounted above the liquid level on the top of the tank, or on a platform that spans the top of the open tank.
How does radar level measurement work?
The device operates according to the FMCW method (FMCW = Frequency Modulated Continuous Wave). Electromagnetic pulses in the GHz range are sent to the medium at different frequencies between 77 and 81 GHz. Since the transmitter is constantly changing the frequency of the transmitted signal, there is a frequency difference between the transmitted and reflected signals. Subtract the frequency of the reflected signal from the frequency of the transmitted signal at that time to obtain a low-frequency signal proportional to the horizontal distance. This signal is further processed to enable fast, reliable and highly accurate level measurement
Speifications
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| Housing: | Steel 316L | |
| Seal ring between housing and housing cover | Silicone |
| view Point window on housing | Polycarbonate |
| Ground terminal | Stainless Steel |
| Power: | Two-wirc | standard version | (16~36) VDC |
| Intrinsic safe version | (21.6~26.4) VDC |
| Power consumption | max.22.5mA |
| Ripple allowed | |
| —＜100Hz | Uss＜1V |
| —(＜100~＜100K)Hz | Uss＜10mV |
| Four-wire/two | intrinsic safe+explosion proof | (21.6一26.4) VDC, |
| -chamber | Power consumption | max.1VA,1W |
| Cable: | Cable entry/plug | one cable entry of M20x1.5,one blind of M20x1.5 |
| Spring Connection terminal | Application for cables with cross section of2.5m㎡ |
| Output: | Output signal | 4~-20mA/HART |
| Resolution | 1.6 μa |
| Fault signal | Constant current output:20.5mA; 22mA; 3.9mA |
| Integration time | 0~50 seconds,adjustable |
| Blind spot | end of antenna |
| Max. measurement distance | 10m |
| Microwave frequency | 26GHz |
| Measurement interval | about 1 sec.(depend on parameter settings) |
| Adjustment time | about 1 sec.(depend on parameter settings) |
| Resolution on display | 1mm |
| Accuracy | see the diagram below |
| Temperature for storage/transport | (-40～80)℃ |
| Process tempcrature (probe) | (-40～250)℃ |
| Relative humidity | ＜95% |
| Pressure | Max.4MPa |
| Vibration proof | mechanical vibration l0m/s3 ,(10~～150)Hz |
Applications
● City water supply
● Sewage treatment
● Tank level monitoringT
● Water-saving irrigation
● Circulation fluid monitoring
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Flange Non Contact Radar Oil Level Sensor Transmitter Range Configuration Images
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