1 Working principle of radar level meter
The general principle of FMCW radar level meter is that the radar emits electromagnetic waves at the top of the tank, and the electromagnetic waves are received by the radar after they meet the medium reflection, and the frequency difference δf between the received signal and the transmitted signal is proportional to the distance R of the medium surface: R=C (speed) *δf (frequency difference) /2/K (frequency modulation slope). Because the speed of light C and the frequency slope K are known, the frequency difference δf can be estimated to obtain the distance R from the surface of the radar installation location, and then subtract the space distance from the radar to the surface by the known total height of the tank (referred to as the height of the air) to obtain the height of the material level.
2 technical specifications
| measuring principle | 2 / 4 wire, FMCW radar |
| frequency range | W-band [76-81GHz] |
| maximum operating range | The maximum is 120 meters |
| certainty of measurement | ±1mm |
| output form | 4~20mA,RS-485 |
| communication mode | HART,MODBUS |
| Power supply range | 24±6V |
| Antenna form | Horn or lens antenna |
| Process joint | Flange starts from DN50 and thread starts from G3 / 4 |
| Process pressure | -1…20 bar |
| Process temperature | -40~+200℃ |
| Environmental storage temperature | -40~+80℃ |
| incrustation | Casting aluminum / stainless steel |
| Seal between the housing and the housing cover | silicon rubber |
| Case window | polycarbonate |
| earth terminal | stainless steel |
| Cable inlet / plug | 1 blind block M20×l.5/1 M 20xl.5 cable inlet |
| connecting terminal | Lead cross-section is 2.5mm² |
| breakdown signal | Current output is unchanged；21mA；3.6mA |
| integration time | (0～20)s,tunable |
| fade zone | 0.05m/0.2m |
| Measurement interval | About 1 second (depending on the parameter settings) |
| governing time | About 1 second (depending on the parameter settings) |
| relative humidity | ˂ 95% |
| shatter-proof | mechanical shock l0m/s² , (10～150)Hz |
| levels of protection | IP67 |
| anti-hazard classification | ExdiaIICT6 |
| way to install | Threaded or flange |
3 Product characteristics
1. The measurement accuracy of millimeter-wave radar can reach ± 1mm, and the measurement blind area is 50mm.
2. Smaller antenna size, to meet the more working conditions for measurement.
3.A variety of lens antennas, 3 emission Angle, more concentrated energy, stronger echo signal, under the same industrial and mining conditions, with higher reliability than other radar products.
4.With stronger penetration, it can also be used normally in the case of adhesion and condensation.
5.The dynamic signal range is larger and is more stable for measurements of low permittivity media.
6.Multiple measurement modes, and the radar reaction time is less than 1S in the rapid measurement mode.
4 Schematic diagram of the installation pipe:
The maximum height of H max depends on the diameter of D and the emission angle of the product. Too long the installation and takeover will affect the radar performance.
Ø 1.5-inch antenna, 8 emission Angle
Ø A 3.5-inch antenna, 3 emission Angle
structure size
Ø Casting aluminum case stainless steel watch case
Antenna size
FAQ
1. Q: What information need to be provided to choose the suitable model?
A: Application field, Nominal pressure ,Medium & medium temperture , Power supply , Output,
Flow range, Accuracy, Connection and other parameters.
2. Q: Are you a trade company or a manufacturer?
A: We are an ISO approved manufacturer specialized in level and flow measuring instruments.
OEM & ODM service are available. Welcome to visit us in China.
3. Q: What is your MOQ?
A: To start our cooperation, sample order is acceptable.
4. Q: What is your delivery date for the Intelligent Mini Micro Turbine Fuel Oil Diesel Flow Meter?
A: The delivery date is about 3-15 working days after receipt of payment.
5. Q: What is your payment terms?
A: We support T/T, PayPal ,Western Union.
For mass production order, it is 30% deposit in advance and 70% balance before shipment.
6. Q: Do you have a warranty for the Flow Meter?
A: Yes, we have the warranty of 12 months.
Product Tags:
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Radar Liquid Level Sensor, Non-Contact 4-20mA/RS485 The Maximum Is 120 Meters Images
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