Marmonix MRL-3100 (MRL 3100) 26 GHz Radar Level Transmitter

The Marmonix MRL-3100 radar level transmitter (MRL 3100) is a non-contact 26 GHz level sensor for tanks holding corrosive liquids. Its specification table gives a 10 m measuring range with ±5 mm precision, process temperature from −40 to 120 °C and pressure from −0.1 to 0.3 MPa. It carries an Ex ia IIC T6 Ga intrinsic-safety marking and IP67 protection, sends 4–20 mA with HART (two- or four-wire) or RS485 Modbus, and shows level on a four-digit LCD in an aluminium housing with a thread or optional flange connection. See the full Marmonix level transmitters range, including the MRL-3500 radar sensor for liquids and the MLS-2204 ultrasonic level sensor, or read the radar and ultrasonic level transmitter guide.

Types of radar level transmitter MRL-3100

This series of radar level meter Marmonix MRL-3100 adopted 26G high frequency radar sensor, the maximum measurement range can reach up to 70 meters. Antenna is optimized further processing, the new fast microprocessors have higher speed and efficiency can be done signal analysis, the instrumentation can be used for reactor, solid silo and very complex measurement environment.
Radar level transmitter antenna microwave pulse is narrow, the downward transmission antenna. Microwave exposure to the medium surface is reflected back again by the antenna system receives, sends the signal to the electronic circuit automatically converted into level signals (because the microwave propagation speed, electromagnetic wave to reach the target and the reflected back to the receiver this time is almost instantaneous).

Types of radar level transmitter MRL-3100 Features

Design points listed for the MRL-3100 radar level transmitter:

• Small antenna size, easy to install; Non-contact radar, no wear, no pollution.
• Almost no corrosion, bubble effect; almost not affected by water vapor in the atmosphere, the temperature and pressure changes.
• Serious dust environment on the high level meter work has little effect.
• A shorter wavelength, the reflection of solid surface inclination is better.
• Beam angle is small, the energy is concentrated, can enhance the ability of echo and to avoid interference.
• The measuring range is smaller, for a measurement will yield good results.
• High signal-to-noise ratio, the level fluctuation state can obtain better performance.
• High frequency, measurement of solid and low dielectric constant of the best choice.

Types of radar level transmitter MRL-3100 Specifications:

Case study: fitting a radar level transmitter on a chemical dosing tank

A water treatment plant stores an acid for pH correction in a closed tank. Floats and pressure cells in direct contact with the liquid corrode, foul and need frequent replacement, so the plant switches to a sensor that never touches the product.

Before ordering, the engineer checks the essentials:

• Wetted material: confirm the antenna and seal materials suit the specific chemical and its vapour.
• Mounting point: choose a nozzle away from the fill stream, the tank wall and internal ladders so the beam reaches a clear surface.
• Range and conditions: make sure tank height, temperature and pressure sit inside the transmitter’s published limits.
• Hazardous area: if the zone is classified, an intrinsically safe device needs a matching safety barrier in the loop.

Once installed, the empty and full distances are set, the 4–20 mA signal is scaled in the control system, and high and low alarms protect the dosing pump. The local display lets the operator compare the reading with a sight glass during commissioning.

MRL-3100 radar level transmitter: quick answers

What range does the MRL-3100 cover?

The specification table lists a 10 m measuring range. The 70 m figure in the overview text describes the 26 GHz series as a whole.

Can the MRL-3100 be used in a hazardous area?

Its specification shows the Ex ia IIC T6 Ga marking. Check your zone classification and use an approved safety barrier with an intrinsically safe loop.

Which outputs does the MRL-3100 offer?

4–20 mA with HART in two-wire or four-wire form, or RS485 with Modbus, plus a local four-digit LCD.