The KLD802 80G radar level gauge employs frequency modulated continuous wave (FMCW) technology. The antenna transmits high-frequency FM radar signals with linearly increasing frequency. These signals are reflected by the measured medium and received by the same antenna. The frequency difference between transmitted and received signals is proportional to the measured distance. Through fast Fourier transform (FFT) processing of the frequency difference signal, the echo spectrum is obtained, enabling precise distance calculation to the target.
The radar antenna transmits narrow microwave pulses that reflect off the measured medium surface and return to the antenna system. These signals are processed by electronic circuits and converted into level signals. Due to the extremely fast transmission speed of microwaves, the time required for transmission and reflection is negligible.
During installation, avoid positioning the instrument above material inlets and minimize proximity to signal-interfering objects such as stirring paddles.
Power Supply (4～20) mA/HART (2 wire): Power supply and output current signal share a two-core shielded cable. Refer to technical data for specific voltage range requirements.
(4～20) mA (4 wire/6 wire): Separate power supply required. Use four-core shielded cable for power and current signal (six-core required for simultaneous RS485 interface output).
RS485/Modbus: Separate power supply required. Use four-core shielded cable for power and digital signal (six-core required for simultaneous current signal output).
Observe local electrical installation regulations and personnel health and safety requirements. All electrical component operations must be performed by trained professionals. Verify instrument nameplate specifications meet your requirements and ensure power supply voltage matches nameplate specifications.
This instrument meets IP66/67 protection class requirements. Ensure cable sealing head waterproof integrity as shown:
IP67 Compliance Requirements:
- Ensure sealing head is undamaged
- Verify cable integrity
- Use cables meeting electrical connection regulations
- Bend cable downward before electrical interface entry to prevent water ingress (①)
- Tighten cable gland securely (②)
- Plug unused electrical interfaces with blind plugs (③)
Beam Angle: The beam angle represents the angle where radar wave energy density reaches half maximum value (3dB width). Microwave signals emitted beyond beam range may reflect off 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° |
Larger antenna sizes with smaller beam angles (α) generate fewer interference echoes. For optimal measurement accuracy, avoid installing internal devices (limit switches, temperature sensors, bases, vacuum rings, heating coils, baffles, etc.) within the signal beam range.
