The Tokyo Keiki MRF-10 flat radar level sensor
The MRF-10 is a loop-powered radar level gauge, which can be installed easily in a variety of applications. The MRF-10 employs anon-contact radar level gauging principle based on pulsed microwave signals and is suitable for level measurement in applications such as liquids, pastes and slurries.
The MRF-10 uses a 5.8GHz low power pulsed microwave. It provides good measurement stability, because propagation of microwaves is less affected by change of temperature,pressure or gas conditions in tank.
Measuring principle
The MRF-10 level gauge utilizes the time-of-flight measurement principle involving short microwave pulses. Installed at the top of tanks or channels, it emits short microwave pulses toward liquids or pastes.
Reflected microwave signals from the surface are received by the antenna, and processed by electronics. The time from transmission to reception is determined by the microprocessor and converted as distance from the transmitter to the liquid surface (ullage) with output of the calculated level from the measured ullage (Level = Tank Height – Ullage).
Specification
1. General |
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| Measuring principle | Microwave Pulse Echo |
| Operating frequency | 5.8 GHz |
| Half power beam angle | Lengthwise: 50deg. Crosswise: 23deg. |
| Transmitting power | less than 35 micro V/m at 3m |
| Measuring range | Max. 10m (33') |
| Serial communication | HART communication |
2. Power |
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| Supply voltage | 16..36 VDC(Non-Ex) |
| Specification for HART |
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3. Output Variable |
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| Variable | Ullage / Level / Volume / Current / Signal amplitude/Volume Max |
| Unit | Level, Ullage : m/ft Volume : % Current : mA Amplitude : dB |
| Signal type | Analog 4..20mA, HART |
| Resolution | Analog: 4microA Digital: 1mm (0,04') |
| Update time | 1 s |
| Averaging time | 1..120 s |
| Signal on alarm | Hold/Low(3,9mA)/High(22mA) |
4. Accuracy |
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| Measured error *) | ±5 mm (0.2”) (0.1m up to 5m) ±10 mm (0.4”) (5m up to 10m) |
| Linearity *) | less than ±10 mm (0.4”) |
| Repeatability *) | ±1 mm (0.04”) |
| Ambient temperature effect | ±0.01% / 10 K |
| *): Free-space reflection from flat metal surface, ambient temperature 25 °C (77 °F), atmospheric pressure | |
5. Environment resistance |
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| Ambient temperature | -20 ℃ to 70 ℃ (-4°F to 158°F) |
| Storage temperature | -40 ℃ to 80 ℃ (-40°F to 176°F) |
| Degree of protection | IP68 (under water 10m / 24hours) |
| Vibration resistance | IEC 68-2-6/1G |
| Harmonized standard (Immunity) | EN 61000-4-4 EN 61000-4-6 |
| Lightening Arrester | IEC 61000-4-5 (Level 4) (Common mode 4kV / Normal mode 2kV) |
6. Construction |
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| Connecting cable type | Shielded twisted 3-cores Cross-section area of cable: 0.2..2.5 mm2, (AWG24..14) |
| Connection Cable Length | 10m |
| Transmitter Case | Stainless steel Di-cast SCS-14 |
| Antenna face panel | FRP resyn |
| Mass | 2.7kg (except attached cable) |
Downloads |
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| Catalogues | |
 Flat Radar Level Sensor MRF-10 (321.28 kB) |
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| Manuals | |
| Flat Radar Level Sensor MRF-10 (1.7 MB) |