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Ⅰ. General Introduction
BT7301/2 radar level transmitters emit narrow microwave pulses from their antennas. These pulses propagate at the speed of light in space, and when they encounter the surface of the measured medium, a portion of their energy is reflected back and received by the same antenna. The time interval between the transmitted and received pulses is directly proportional to the distance between the antenna and the surface of the measured medium.
Due to the extremely high speed of electromagnetic wave propagation, it is challenging to accurately determine the time interval between the transmitted and received pulses, which is on the order of nanoseconds. The BT7301/2 radar level transmitters employ a special demodulation technique that allows for precise identification of the time interval between the transmitted and received pulses, enabling accurate calculation of the distance from the antenna to the surface of the measured medium.
Ⅱ.Product Features
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Narrow Beam & High Precision: The 26GHz high-frequency microwave emission produces a concentrated beam angle, effectively minimizing obstacle echoes and signal interference for stable, precise level tracking.
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Extended Measuring Range: Supports non-contact liquid level monitoring up to 30m (BT7301) and 70m (BT7302), ideal for large-scale reservoirs, rivers, and deep process tanks.
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Ultra-Lightweight & Easy Installation: Weighs approximately 1 kg, simplifying field mounting on vertical brackets, gantry structures, or standard flanges (DN50–DN250).
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Extreme Process Adaptability: Handles antenna process temperatures from -40°C to +250°C and pressure up to 4 MPa.
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Safe & Low Power Consumption: Operates in pulse mode with minimal emission power, safe for operators and compatible with 6–26VDC power supplies.
Ⅲ. Technical parameters
| Main Specifications | Blind Area | End of the Antenna | |
| Max. Measuring Distance | BT7301 | 30m | |
| BT7302 | 70m | ||
| Microwave Frequency | 26 GHz | ||
| Communication Interface | Mod-bus | ||
| Measuring interval | ≈ 1s | ||
| Adjusting Time | ≈ 1s | ||
| Display Resolution | 1 mm | ||
| Working/Storage/Transportation Temp. | (-40~100 )℃ | ||
| Process Temp.(Antenna) | (-40~250 )℃ | ||
| Pressure | Max. 4MPa | ||
| Shock-proof | Mechanical vibration of 10m/s⋙ | ||
| Power Supply 4-Wire |
Standard | (6~26)VDC | |
| Consumption | max 12mA | ||
| Allowed Wave | -<100Hz | Uss<1V | |
| -<(100-100k)Hz | Uss<10mV | ||
| Output Parameters | Output Signal | RS485 | |
| Communication Protocol | Mod-bus | ||
| Resolution | 1.6 u AC | ||
| Breakdown Signal | Current output remains unchanged | ||
| 20.5 mA | |||
| 22 mA | |||
| 3.9 mA | |||
| Integral time | (0-50)s, adjustable | ||
| Housing | Sealing between outer cover and shell | Silicon rubber | |
| Shell Window | Polycarbonate | ||
| Ground Terminal | Stainless Steel | ||
| Cable Parameters | Cable entry/plug | M20*1.5 Cable entry | |
| Connecting Terminal | Wire Cross-section 1.0 mm² |
Ⅳ. Dimensional structure(Unit:mm)
BT7301
| Flange | Bell Mouth Diameter | Bell Mouth Height |
| DN50 | φ46 | 140 |
| DN80 | φ76 | 227 |
| DN100 | φ96 | 288 |
BT7302
| Flange | Bell Mouth Diameter | Bell Mouth Height |
| DN80 | φ76 | 227 |
| DN100 | φ96 | 288 |
| DN125 | φ121 | 620 |
Options for Flange
| Size | Diameter-D | Center hole spacing-K | Number of holes-N | Aperture |
| DN50 | φ165 | φ125 | 4 | 18 |
| DN80 | φ200 | φ160 | 8 | 18 |
| DN100 | φ220 | φ180 | 8 | 18 |
| DN125 | φ250 | φ210 | 8 | 18 |
| DN150 | φ285 | φ240 | 8 | 22 |
| DN200 | φ340 | φ295 | 12 | 22 |
| DN250 | φ405 | φ355 | 12 | 26 |
Ⅴ.Typical Industry Applications
Hydrological & Surface Water Monitoring:
Long-distance, non-contact level measurement for rivers, lakes, reservoirs, tidal channels, and flood warning systems.
Water Conservancy & Dams:
Precise water head monitoring at spillways, dam crests, and intake gates.
Industrial Liquid & Wastewater Tanks:
Level sensing in chemical storage vessels, water treatment sedimentation basins, and industrial sumps.
Severe Weather & Environmental Monitoring:
Rugged IP67 protection ensures continuous operational reliability under heavy rain, dust, and outdoor vibration.