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non-corrosive liquide level measurement 15m 80G Radar Level Meter
juice processing plant
KLD801 80G radar level gauge adopts frequency modulated continuous
wave (FMCW) technology. The antenna emits a high-frequency FM radar
signal, and the frequency of the radar signal increases linearly.
The transmitted radar signal is received by the same antenna after
being reflected by the measured medium. At the same time, the
frequency difference between the transmitted signal frequency and
the received signal frequency is proportional to the measured
distance. The collected frequency difference signal is subjected to
fast Fourier transform (FFT) to obtain the spectrum of the
reflected echo, and the distance to the target to be measured is
calculated based on this.
1.Product Dimension
2. Working Principle
The radar antenna transmites narrow microwave pulse which will be
reflected back when reaching the surface of the medium tested and
then received again by the antenna system. The signals shall be
transmitted to the electric circuit and then converted into level
signals. As the transmission speed of microwave is so fast, the
time used for the microwave transmission to the surface of the
medium tested and then reflected back is almost 0.
3. Technical Features
⚫ Millimeter wave radar, the measurement accuracy can reach up to
±2mm, and the minimum measurement blind zone is 0.05m.
⚫ The smaller antenna size satisfies the measurement of more
working conditions.
⚫ A variety of lens antennas, smaller launch angles, more
concentrated energy, stronger echo signals, and higher reliability
than other radar products under the same industrial and mining
conditions.
⚫ It has stronger penetration and can be used normally in the case
of adhesion and condensation.
⚫ The dynamic signal range is larger, and the measurement of low
dielectric constant media is more stable.
⚫ Multiple measurement modes, radar response in fast measurement
mode
4. Technical Specification and Model Selections
Medium | liquid, non-corrosive |
Measuring range | 0.05m~10/20/30/60/100m |
Process connection | G1½A / 1½NPT thread / flange ≥ DN40 |
Process temperature | -40~80℃ |
Process pressure | -0.1~0.3 MPa |
Antenna size | 32mm lens antenna |
Antenna material | PTFE |
Accuracy | ±1mm |
Protection class | P67 |
Center frequency | 80GHz |
Launch angle | 3° |
Power supply | Two-wire /DC24V / Four-wire system/DC12~24V / Four-wire system/AC220V |
Casing | aluminum/plastic/stainless steel |
Signal output | two-wire /4...20mA/HART protocol Four-wire system: 4...20mA/ RS485 Modbus |
5. Installation Requirements
When installing the instrument, avoid installing it above the
material inlet, and try to avoid various objects that affect the
signal, such as stirring paddles, etc.
6. Electrical Connection
Power Supply
(4~20) mA/HART(2 wire)
The power supply and the output current signal share a two-core
shielded cable. Please refer to the technical data for the specific
supply voltage range.
(4~20) mA(4 wire/6 wire)
The power supply needs to be powered separately, and a four-core
shielded cable is used for the power supply and current signal (the
current signal and the RS485 interface can be output at the same
time, and a six-core shielded cable is required for simultaneous
output).
RS485/Modbus
The power supply needs to be powered separately, and a four-core
shielded cable is used for power supply and digital signal. (The
current signal and the RS485 interface can be output at the same
time, and a six-core shielded cable is required for simultaneous
output).
7.Connection
8.Safety Guide
Please observe the requirements of the local electrical
installation regulations! Follow local regulations for personnel
health and safety. All operations on the electrical components of
the instrument must be completed by professionals who have received
formal training. Please check the nameplate of the instrument to
ensure that the product specification meets your requirements.
Please ensure that the power supply voltage is consistent with the
requirements on the nameplate of the instrument.
9.Grade of Protection
This instrument fully meets the requirements of protection class
IP66/67, please ensure the waterproofness of the cable sealing
head. As shown below:
How to ensure that the installation meets the requirements of IP67:
Make sure the sealing head is not damaged.
Make sure the cable is not damaged.
Please make sure that the cables used meet the requirements of the
electrical connection regulations.
Before entering the electrical interface, bend the cable down to
ensure that water will not flow into the housing, see ①
Please tighten the cable gland, see ②
Please plug the unused electrical interface with a blind plug, see
③
10.Sensor linearity
Beam Angle
The beam angle is the beam angle at which the energy density of the
radar wave reaches half of its maximum value (3dB width).
Microwaves emit signals out of beam range and can be reflected by
interfering objects.
Lens Antenna Diameter | Φ32mm lens Antenna | Φ42mm lens Antenna | Φ76mm lens Antenna | Φ74.7mm lens Antenna with air purge |
Beam Angle | 7° | 6° | 3° | 3° |
The larger the antenna size and the smaller the beam angle α, the
less interference echoes will be generated.
For more accurate measurements, avoid installing any internal
devices (such as limit switches, temperature sensors, bases, vacuum
rings, heating coils, baffles, etc.) within the range of the signal
beam.
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