蒙自LRD-F21 Radar Level Meter
●80G FM Radar
●Small launch angle
● Strong echo signal
● Can be configured via HART handheld device
● Suitable for high-temperature and high-pressure applications
● Equipped with RS485 functionality (please specify when ordering)
Category:
Product Description
Product Overview Product overview
The LRD-F21 series sensors are 80G frequency-modulated radar-based level measurement instruments capable of measuring distances up to 150 meters. The antenna has been further optimized, and a new, high-speed microprocessor enables faster signal analysis and processing, making these instruments suitable for measuring solid materials in challenging environments such as high temperature and high pressure. They are widely used across industries including chemical processing, metallurgy, water resources, coal mining, and petroleum.
Product Principle THE PRODUCT PRINCIPLE
The general principle of a frequency-modulated continuous-wave radar level meter is that the radar emits electromagnetic waves from the top of the tank. When these waves encounter the medium and reflect back, they are received by the radar. The frequency difference δf between the received signal and the transmitted signal is directly proportional to the distance R from the radar to the surface of the medium: R = C (speed of light) × δf (frequency difference) / 2 / K (frequency modulation slope). Since both the speed of light C and the frequency modulation slope K are known, once the frequency difference δf is calculated, the distance R—the height of the material surface relative to the radar installation point—can be determined. Finally, by subtracting this "empty space" distance (the space between the radar and the material surface) from the tank's total height, you can accurately calculate the actual material level inside the tank.
Performance metrics TECHNICAL PARAMETERS
| Process Link | Flange / Material: PP, PTFE, Stainless Steel, Stainless Steel + PTFE Flange |
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| Material | Cast aluminum / Stainless steel / ABS plastic |
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| Shell | Sealing between the outer shells | Silicone rubber | ||
| Shell window | Polycarbonate | |||
| Ground terminal | Stainless steel | |||
| Supply voltage | Four-wire system | Standard model | (198–242) V AC |
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| Power consumption | Max 80mA, DC 24V / 2W | |||
| Allow ripples | <100Hz | USS < 1V | ||
| (100–100 kHz) Hz | USS < 10 mV | |||
| Dual-chamber enclosure | (15–28) V DC |
Four-wire system | ||
| 100V AC | Four-wire system | |||
| Cable Parameters | Cable entry/connector | 1 M20x1.5 cable entry | ||
| 1 blind plug M20×15 | ||||
| Ground terminal | Wire cross-section: 2.5 mm 2 | |||
| Output parameters | Output signal | (4–20) mA / RS485 Modbus | ||
| Resolution | 1mm | |||
| Fault signal | Current output remains unchanged: 20.5mA, 22mA, 3.9mA | |||
| Integration Time | (0–20) s, adjustable | |||
| Blind spot | 0.1m/0.2m/0.3m | |||
| Maximum measurement interval | 150 meters | |||
| Measure the spacing | Approximately 1 second (depending on the parameter settings) | |||
| Adjust the time | Approximately 1 second (depending on the parameter settings) | |||
| Adjust working, storage, and transportation temperatures | (-40 to 80)°C | |||
| Process temperature | LRD-F11S | -40 to 100°C |
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| LRD-F11 | -40 to 80°C |
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| LRD-F12 | -40 to 100°C |
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| LRD-F13 | -40 to 120°C / -40–110°C (threaded connection) |
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| LRD-F14 | -40~200°C | |||
| Relative humidity | <95% | |||
| Pressure | Max2.5MPa | |||
| Earthquake-resistant | Mechanical vibration: 10 m/s 2 (10–150) Hz | |||
External dimensions APPEARANCE OF SIZE
Installation Requirements INSTALLATION
When installing the instrument, avoid positioning it directly above the feed inlet, and try to keep it clear of any objects that could interfere with the signal, such as stirring paddles.
There must be no obstructions above the feed inlet or below the instrument.
Under extremely complex operating conditions, the instrument functions normally within a 20-cm-radius area centered on the radar installation point, provided there are no obstructions.
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