YURA-FMW21S Frequency Modulation
YURA-FMW21S Frequency Modulation
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Measuring
Medium: Solid
Measuring Range: 0.1 m–30 m / 0.3 m–150 m
Process Connection: Flange ? DN80
Process Temperature: 40°C to +80°C
Process Pressure: 0.1 to 0.3 MPa
Accuracy: ±5 mm
Protection Rating: IP67
Center Frequency: 80 GHz
Power Supply: Two-wire (DC 24V) / Four-wire (AC 220V) / Six-wire (DC
12V–24V)
Housing Material: Aluminium / Plastic / Stainless Steel
Signal Output: Two-wire 4...20 mA with HART Protocol / Four-wire 4...20 mA
/ RS485 (Modbus)
Product Overview
The YURA-FMW
Series features advanced 80GHz frequency-modulated radar
technology for precise and reliable level measurement.
With a measurement range of up to 150 meters, this series is designed for
challenging industrial applications involving solids, high temperatures,
and high pressures.
An optimized
antenna design and a next-generation high-speed
microprocessor enable superior signal analysis and rapid data processing.
The result is exceptional accuracy, stability, and performance across a wide
range of operating conditions.
Working Principle
The YURA-FMW radar level sensor operates based
on the Frequency-Modulated Continuous Wave (FMCW) principle.
The radar emits electromagnetic waves from the
top of the tank toward the medium’s surface.
These waves are reflected back to the radar
and received by the sensor.
The frequency difference (δf) between the
transmitted and received signals is directly proportional to the distance (R)
between the radar and the material surface.
The relationship can be expressed as:
R = (C × δf) / (2 × K)
Where:
R = distance to the material surface
C = speed of light
δf = frequency difference
K = modulation slope
Since C and K are known constants, the radar
accurately calculates the distance R by measuring the frequency difference δf.
By subtracting this distance (the “empty
height”) from the total tank height, the instrument precisely determines the
actual material level inside the tank.
Technical Parameters
Process
Connection: Flange
Flange Material: PP / PTFE / Stainless Steel / Stainless Steel + PTFE
Housing
Material: Cast Aluminum / Stainless Steel / ABS Plastic
Sealing
Between Housings: Silicone Rubber
Shell Window: Polycarbonate
Grounding Terminal: Stainless Steel
Power
Supply Voltage:
Four-wire
System (Standard Type): (198–242) V AC
Dual-Cavity
Shell: (15–28) V DC
Four-wire
System (Low Voltage): 100 V AC
Power
Consumption: Max 80 mA (DC 24V / 2W)
Permissible Ripple:
<100 Hz: Uss
< 1 V
(100–100 kHz): Uss
< 10 mV
Cable
Parameters:
Cable Inlet/Plug:
1 × M20×1.5 Cable Inlet
1 × Blind Block
M20×1.5
Grounding
Terminal Conductor Cross-Section: 2.5 mm²
Output
Parameters:
Output
Signal: 4–20 mA / RS485 (Modbus)
Resolution:
1 mm
Fault
Signal (Current Output Fixed): 20.5 mA / 22 mA
/ 3.9 mA
Response
Time: Adjustable (0–20 s)
Blind
Zone: 0.1 m / 0.2 m / 0.3 m
Maximum
Measuring Distance: 150 m
Measuring
Interval: Approx. 1 second (depending on settings)
Adjustment
Time: Approx. 1 second (depending on settings)
Temperature
Range:
Storage
& Transportation: −40°C to +80°C
Process
Temperature:
YURA-FMW11S:
−40°C to +100°C
YURA-FMW11:
−40°C to +80°C
YURA-FMW12:
−40°C to +100°C
YURA-FMW13:
−40°C to +120°C / −40°C to +110°C (threaded connection)
YURA-FMW14:
−40°C to +200°C
Relative
Humidity: < 95%
Maximum Pressure: 2.5 MPa
Vibration Resistance: 10 m/s² (10–150 Hz)
