MV-RD704 Coaxial Guided-Wave Radar Level Meter

selection summary

MV-RD704 is a coaxial guided wave radar level gauge, mainly used for liquid measurement. The reference range is 0.3-6m; 0-6m can be customized. It is suitable for oil-water interface, power plant lubricants, deaerators, low-temperature heaters, liquefied gas underground tanks and pharmaceutical pure water. When selecting, you should focus on checking the range, temperature and pressure, connection, material, output and installation conditions.

Product overview

Coaxial guided wave radar level gauge has concentrated energy and no obvious upper blind area, and is suitable for measuring small tanks and low dielectric constant liquids.

Measurement principle

The MV-RD704 sends low-energy microwave pulses along a rod, cable, or coaxial probe. After the pulse reaches the position where the dielectric properties change, an echo is formed, and the instrument calculates the level or interface position based on the propagation time. The probe form, length, material buildup and distance from the components inside the tank will directly affect the echo quality.

Core advantages

Coaxial antenna, concentrated energy
Customizable topless dead zone structure
Suitable for narrow tanks and low dielectric constant media

Usage scenarios

oil-water interface
Power plant lubricating oil, deaerator, low temperature heater
Liquefied gas underground tanks and pharmaceutical pure water

application benefits

Procurement concernThe probe form, length, material and sealing of MV-RD704 are part of the complete model and should be confirmed together with the meter head, process connection and output configuration when enquiring.

technical valueMicrowaves propagate along the probe, which is suitable for limited installation space and some steam, foam or low dielectric constant process conditions; whether it is suitable needs to be judged based on the material buildup and interface conditions.

Operation and maintenance valueAfter commissioning, the echo curve can be retained as a benchmark, and subsequent inspections will focus on the probe's loading, swing, tension and sealing status.

Technical parameters

Applicable media	liquid
Measuring range	0.3-6m; 0-6m can be customized
process connection	3/4NPT; flange≥DN25
process temperature	-40-130℃; high temperature type -40-200℃; customized type -40-250℃
process pressure	-0.1-2.5MPa; high pressure type can reach 10MPa
Measurement accuracy	±3mm
antenna	25mm/40mm coaxial antenna
Antenna material	304/316L
Protection level	IP67
frequency range	500MHz-1.8 GHz
Power supply and output	Two-wire system DC24V / 4-20mA / HART; optional four-wire system AC220V, RS485/Modbus, dual relay, FF, PROFIBUS-PA
Explosion-proof certification (optional)	Ex ia IIC T6 Ga / Ex db IIC T6 Gb
Parameter setting method	Display programming/Bluetooth/HART protocol/Tank side display
Electrical interface	M20×1.5 / 1/2 NPT
Seal selection	Confirm by medium, temperature and pressure

Note: The above are data reference values; optional output, explosion-proof, flange, sealing and temperature and pressure combinations are subject to the final selection confirmation and order code.

Selection guide

Confirm the dielectric constant of the medium, the presence of steam/foam/material buildup, and whether interface measurements are required.
Choose rod, cable, dual cable or coaxial probes based on tank height, space under the probe and internal components.
Check process temperature, pressure, corrosiveness and sealing materials; extreme temperatures and pressures need to be checked at the same time.
Confirm process connections, probe length, output protocol, explosion protection level and on-site display requirements.

specification range:Careful confirmation is required: interface measurements where material hangs or crystallizes severely, the cable probe may hit the wall, the stirrer may hit the probe, and the dielectric constant difference between the upper and lower layers is insufficient. For such process conditions, the model cannot be determined based on the range alone.

Key points for installation and commissioning

The probe should be kept as far away from the feed port, agitator and tank components as possible, and the cable probe should avoid swinging and hitting the wall.
The probe length, counterweight and bottom clearance are confirmed according to the tank structure, and the empty tank/full tank calibration is completed after installation.
Interface measurement needs to confirm the difference in dielectric constant between the upper and lower layers and verify the echo under real process conditions.

Procurement and Technical Confirmation Checklist

Media name, density/dielectric properties, corrosiveness, and foam, vapor, dust, crystallization or material buildup.
Container/channel dimensions, normal and extreme ranges, installation location, nozzle or bracket dimensions, internal components and on-site photos.
Process temperature and pressure combinations, wetted materials, sealing, protection, explosion-proof areas and ambient temperature.
Power supply, output protocol, wire system, display/commissioning method, control system interface and accessory requirements.
It is recommended to check the arrival acceptance: nameplate model, process connection, measuring range, material, power supply output, explosion-proof certificate and random documents.

FAQ

What media is MV-RD704 mainly suitable for measuring?

MV-RD704 is designed for liquids. Common scenarios include oil-water interface, power plant lubricating oil, deaerator, low-temperature heater, liquefied gas underground tank and pharmaceutical pure water. If there is heavy foam, crystallization, serious hanging or extremely low dielectric constant, the echo conditions should be checked first.

What is the measuring range of MV-RD704?

The data range of MV-RD704 is 0.3-6m; 0-6m can be customized. The selection should be based on the effective range, blind zone, installation height and abnormal high and low positions, and should not be selected based on the total height of the container.

What are the allowed temperatures and pressures of the MV-RD704?

The reference temperature range of MV-RD704 is -40-130℃; the high-temperature type -40-200℃; the customized type -40-250℃, the reference pressure range is -0.1-2.5MPa; the high-pressure type can reach 10MPa. The upper temperature limit and the upper pressure limit cannot be used at the same time by default, and the sealing, flange and explosion-proof configurations need to be confirmed according to the combined process conditions.

How to choose the process connection of MV-RD704?

MV-RD704 can refer to 3/4NPT; flange ≥ DN25. The final connection should be determined based on the size of the nozzle, the tank structure, the size of the antenna or probe, the maintenance space and the corrosivity of the medium.

Can MV-RD704 be connected to PLC or DCS?

The reference output configuration of MV-RD704 is two-wire DC24V / 4-20mA / HART; optional four-wire AC220V, RS485/Modbus, dual relay, FF, PROFIBUS-PA. The power supply, analog or digital protocol, station number, baud rate, as well as isolation and lightning protection requirements should be unified before ordering.

What information do I need to provide when making an inquiry about MV-RD704?

Inquiries for MV-RD704 require at least medium, range, temperature, pressure, process connection, material, explosion-proof area, power supply, output protocol, on-site photos and container size; for special process conditions, it is recommended to attach process drawings.

Ordering instructions

This page is used for procurement inquiry, technology selection and preliminary project design. Page parameters cannot replace project-level selection confirmation; when hazardous media, high temperature and pressure, explosion-proof, hygienic or strong corrosive process conditions are involved, please complete written technical confirmation before placing an order.

Guided Wave Radar Level Meters