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MLR-70 Guided-Wave Radar Level Sensor
Brand: Icon Process ControlThe MLR guided-wave radar level sensors are compact level measurement devices that include a transmitter that emits microwave pulses along a rod or wire rope electrode.
The pulse propagates along the electrode in the form of electromagnetic wave toward the level surface, where it is reflected and the signal wave component is returned to the receiving module of the electronic housing.
The on-board circuitry measures the time of flight of electromagnetic wave and the distance to the surface level is calculated.
According to the level height, the level meter output is set and the measured value is shown on the display.
Radar level meters are resistant against changes in the atmosphere (pressure, temperature, dust, steam) and to changes in medium parameters (change in dielectric constant and conductivity).
Features- FEP Teflon® Coated Probe
- High Accuracy
- Simple Programming
- LCD Display
- IP67 Housing
- 4-20mA Loop Powered
- Output signal: 4-20mA (Standard) | 4-20 mA + HART
- Modbus | RS485
Specifications
Brand
Supply Voltage
- 18 ... 36 Vdc
Output
- 4 ... 20 mA | HART
Current Consumption
- 4 ... 20 mA | Max. 22 mA
Basic Error - for Reference Reflector
- Error is larger at the beginning and end of the rod or rope electrode. More detailed information can be found in the instruction manual
- MLR-70_-20 in area 0.1 - 0,2 m | 0.2 - 2.0 m | 2.0 - 40 m .....:: ± 5 mm | ± 3 mm | ± 2 mm
- Other Types in area 0.1 - 0.2 m | 0.2 - 2.0 m | 2.0 - 40 m .....:: ± 10 mm | ± 4 mm | ± 2 mm
Resolution
- 1 mm
Maximal Length of Measuring Electrode
- MLR-70_-11 (12): 2 mm
- MLR-70_-32: 12 mm
Dead Zone - for Measuring Sensitivity
- Dead Zone = Blind Zone = Blocking distance
- The length of dead Zone at the beginnig | at the end of the electrode. (The length of dead Zone is 110 mm at the end of rope electrode):::
- Low, Medium, User (1-4): 100 | 0 mm
- High, User (5): 150 | 50 mm
- User (6,7): 200 | 50 mm
- User (8): 250 | 50 mm
Electrical Parameters for Variants Xi (XiT) – Maximum Internal Values
- Uᵢ = 30 Vdc, Iᵢ = 132 mA, Pᵢ = 0.99 W, Cᵢ = 370 nF, Lᵢ = 0.9 mH
Measurement Sensitivity (8 Degrees)
- low (1) - medium (3) - high (5) - user (1 - 8)
Failure Indication (Echo Loss, Internal Failure)
- Adjustable in modes: 3.75 mA, 4 mA, 20 mA, 22 mA, LAST
- Level meter displays last measured value
Dampening
- 1 .. 99 s
Warm Up Time
- cca 60 s
Internal Resistance | Electric Strength (Electrode - Housing)
- 10 kΩ
Coupling Capacity | Electric Strength (Housing - Supply Leads)
- 5 nF | 500 Vac
Maximal Current Output Load Resistance for
- U = 24 Vdc, Rmax = 270 Ω | Including 250R resistor in case of HART connection
- U = 22 Vdc, Rmax = 180 Ω
- U = 20 Vdc, Rmax = 90 Ω
Maximum Tensile Strength of the Rope Electrode
- 1400 kg
Protection Class
- IP67
Process Connection
- screwing with thread G1”
Recommended Cable
- PVC 2 x 0.75 mm²
Weight (Without Electrode)
- cca 0.5 kg (1 kg variant NT, XiT)
- Suitable for: Foam, Vapor, Condensate, Turbulence
- Liquid Chemical Storage
- Chemical Sumps
