The Tokyo Keiki MRG-10 microwave level gauge

The advanced performance MRG-10_1_R2 microwave-level-gaugemicrowave-level-gauge-mrg-10_1_R2

The measuring principle is based on Time Flight impulse Radar technology that uses very short pulses.

  • Non contact measuring Non mechanical moving parts
  • High reliability, Easy maintenance
  • High sensitivity
  • Density, Pressure and Temperature independent
  • Loop Power System (2-wire)
  • 4-20mA output and HART output integrated
  • Wide antenna range
  • Interactive Windows-based setup software
  • Built-in display/ keyboard

Measuring principle

The MRG-10 measures liquid levels by transmitting low energy radar pulses towards the liquid surface and receiving the radar echoes. The travel time for the radar pulse is proportional to the distance between the gauge and the surface. Upon reception, microprocessors and intelligent software in the gauge head analyze the echoes and transform them into level output data.

The radar pulse is virtually unaffected by the tank content and atmosphere, temperature or pressure. Thus, radar measurement has proven to be the most reliable gauging method in most applications.

Furthermore, maintenance requirements are in fact zero as no part of the gauge is in physical contact with liquid.

All this makes MRG-10 very well suited for storage and buffer tanks in the chemical and water industry.

MRG-10 applications

mrg-10-applicationThe MRG-10 is appropriate for calm surface liquid. If you intend to use the MRG-10 to measure turbulence surface liquid, you need to use still pipe in order to keep the surface cal. The MRG-10 is appropriate for storage tanks or buffer tanks that have a relatively calm surface.

MRG-10 is appropriate for storage tanks or buffer tanks that have relatively calm surface.

  • Chemical and petroleum
  • Pharmaceuticals
  • Food and beverage
  • Industrial water, such as river intake gates
  • Water supply
  • Sewage water treatment plant
  • Hydraulic power stations

If you intend to use the MRG-10 to measure turbulence surface liquid, you need to use still pipe in order to keep the surface calm. Refer right figure.


The MRG-10 uses a 2-wire system, which means both signal and power are available on the same wiring.

The MRG-10 is certified as an intrinsic safety instrument, if you intend to use it in a hazardous area, an intrinsic safety isolator should be used.

All data are displayed by a 5-digit LCD display on the main body and items easily changed using 4 configuration buttons. It is also possible to operate the Interactive Windows-based setup software on a PC.


1. General

Measuring principle Time Flight impulse Radar technology
Operating frequency 5.8 GHz
Half power beam angle Rod antenna: 30deg., Cone antenna 4”: 34deg., 6”: 22deg., 8”: 17deg.
Microwave output power Max 1μW
Reference conditions Free space reflection from metal surface, ambient temperature 25℃, atmospheric

2. Display / Configuration

Local display 5 digit LCD display with 4 configuration buttons. Level, Ullage, Volume, Current or
Amplitude output
HART hand held communicator Rosemount Communicator RS275, just display not for configuration
PC Remote configuration Windows base setup and configuration software

3. Electrical

Power supply Loop powered 16-36 VDC (16-30VDC in Ex applications)
Output Analog DC4-20mA +HART
Output variable Level, Ullage in m or ft. Volume in %, Amplitude in dB.
Signal on alarm Hold, Low (3.9mA), High (22mA)
Cable entry 2-M20×1.5 (Applicable Cable diameter : 6.5-9.0mm)

4. Mechanical

Antenna Rod antenna, Cone antenna 4”, 6”, 8”
Antenna material exposed to tank Rod antenna: PFA and SUS (316L,ext.version)
Cone antenna: 4”, 6”, 8” SUS (316L), PTFE, Viton
Housing / Enclosure Cast Aluminum
Flange On request or customer supply
Mass 3.3 - 4.3Kg, depend on antenna size
Height above flange 230 mm

5. Environment Condition

Max. pressure 10 bar. (145 psi)
Ambient temperature -20 ℃ to 70 ℃ (-4°F to 158°F), LCD Display –20℃ to 70℃
Storage temperature -40 ℃ to 80 ℃ (-40°F to 176°F)
Tank inside temperature -20 ℃ to 150 ℃ (-4°F to 302°F)
Ingress protection IP65
Vibration resistance IEC 68-2-6/1G
Ex. Approval ATEX II 1/2GD Ex ia IIC T4 (for Cone antenna)
ATEX II 2G EX ia IIC T4 (for Rod antenna)
(Ui=28V / Ii=93mA / Pi=650mW / LiI0H / CiI0F / Group ⅡC)

6. Measuring Performance

Instrument accuracy +/- 10mm
Repeatability +/- 1mm
Update interval 1 Second
Measuring range Depend on Antenna type and product nature


icon Product Data Sheet MRG-10 (1.11 MB)
icon Microwave Level Gauge MRG-10A (287.52 kB)
icon Microwave Level Gauge MRG-10A (3.69 MB)
icon Principles and Howto MRG-10A (425.5 kB)