Xi'an Dehou Electronic Technology Co., Ltd.
Xi'an Dehou Electronic Technology Co., Ltd.
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NYRD705 1.8GHz Guided Wave Radar Level Meter
The guided wave radar level meter is a level meter based on the principle of time domain reflection (TDR). The electromagnetic pulse of the radar level gauge propagates along the steel cable or probe at the speed of light. Part of the pulse of the level meter is reflected to form an echo and return to the pulse transmitter along the same path. The distance between the transmitter and the surface of the measured medium is proportional to the propagation time of the pulse during that period, and the liquid level height is calculated.
Radar Level Meter Technical Parameter
| Parameters | Frequency: 100MHZ-1.8GHZ Measuring range:-cable :0-30m; rod, coaxial :0-6m Repeatability: ± 3mm Resolution: 1mm Sampling: echo 55 samples / s Response speed: 0.2S (depending on the actual usage) Output current signal :4-20mA Accuracy: <0.1% |
| Communication Interface | HART communication protocol |
| Process connection | G1-1/2 Flange DN50, DN80, DN100, DN150 |
| Process pressure | -1 ~ 40bar |
| Power | Power: 24VDC (± 10%), ripple voltage: 1Vpp Power consumption: max 22.5mA |
| Environmental conditions | temperature -40 ℃ ~ +80 ℃ |
| Housing protection grade | IP68 |
| Explosion levels | EXiaIICT6 |
| Instrumentation power supply and signal output wire connection | Sharing a two-core shielded cable Cable entry: 2 M20 × 1.5 (the cables diameter of 5 - 9mm) |
※ Note: Products can be customized according to the specific requirements of users!
Radar Level Meter Operating Principle
Guided Wave Radar is the kind of measuring instrument that is based on the principle of time travel. The radar wave travels at the speed of light, and its running time can be converted into a level signal by the electronic components. The probe emits high-frequency pulses which spread along the cable, and the pulses are reflected back when they encounter the material surface and received by the receiver inside the meter. The distance signal is then converted to the level signal.
Input
The reflected pulse signal is conducted along the cable back to the electronic circuit of the meter, and the microprocessor processes this signal to identify the echo produced by the microwave pulses at the material surface. The recognition of the correct echo signal is done by the intelligent software. The distance D to the material surface is proportional to the time travel T of the pulse:
D=C×T/2
where C is the speed of light
As the distance E of the empty tank is known, the level L is:
L=E-D
Output
Set accordingly to the empty tank height E (= the zero point), the full tank height F (= the full scale) and some application parameters. The application parameters will automatically make the instrument adapt to the measurement environment, corresponding to the output of 4 ~ 20mA.
Radar Level Meter Electricalconnections
◎ Supply voltage
(4 ~20)mA/HART(Two-wire)
The power supply and the output current signal share a two-core shielded cable. Refer to the technical data for the specific supply voltage range. For the intrinsically safe type, a safety barrier must be added between the power supply and the instrument.
(4~20)mA/HART(Four-wire)
The power supply and the current signal are separated, and each uses a two-core shielded wire. Refer to the technical data for the specific supply voltage range.
RS485/Modbus
The power supply and the Modbus signal are separated, and each uses a two-core shielded wire. For specific supply voltage range see technical data .