Guided Level Meters
SmartLine Guided Radar Level Meters use TDR (Time Delay Reflectometry) to measure distance, level, interface, volume and mass. Higher signal dynamics and a sharper pulse than conventional TDR devices ensure better performance.
The SmartLine Guided Radar Level Meter can measure the level of a wide range of liquid products on a large variety of installations within the stated pressure and temperature range, including LPG and LNG. It can be deployed in blending tanks, distillation tanks, process tanks, separators, solid silos (inventory) and storage tanks. It does not require calibration or commissioning when installed, and can measure liquid interface with or without an air gap.
The level meter can also measure level and interface simultaneously as it has an optional second analog output. Lastly, the level meter can measure powders and granulates of materials with dielectric constants of 1.6 and even lower. A variety of rigid and flexible probes allow measurement in silos up to 35 m (115 ft) high.
TDR uses low-intensity electromagnetic pulses along a rigid or flexible conductor. These pulses move at the speed of light, and when they reach the surface of the product to be measured, they are reflected with an intensity that depends on the dielectric constant of the product (for example, water has a high dielectric constant and reflects the pulse back to the meter converter at 80% of its original intensity). The device measures the time from when the pulse is transmitted to when it is received. The time value is converted into an output current of 4-20 mA and/or a digital signal corresponding to the level.
Non-Contact Radar Level Meter
Non-Contact Radar Level Meter measures distance, level, volume and mass. Based on FMCW (Frequency Modulated Continuous Wave) technology, it provides a more stable measurement than pulse radar and is well suited for agitated process conditions and the most demanding applications.
The SmartLine Non-Contact Radar Level Meter can measure the level of a wide range of liquid or granular products on a large variety of installations, including LPG and LNG. The level meter does not require calibration or commissioning when installed and can be applied in agitated process conditions and agitated vessels. The product is available in two versions; the RM70 has its electronics designed specifically for liquids, while the RM60 is meant for powders or granulates.
It offers:
- ± 3 mm/ ± 0.04″ standard accuracy
- Operability up to a flange temperature of 200°C (390 °F) and 40 barg (580 psig)
- Measuring range of up to 80 m (260 ft)
- Reliable measurement in difficult and agitated process conditions
Based on an FMCW radar signal, the level meter transmits a high frequency signal which increases linearly during the measurement phase. The signal is emitted, reflected on the measuring surface and received with a time delay, t (t=2d/c, where d is the distance to the product surface and c is the speed of light in the gas above the product). For further signal processing, the difference is calculated from the actual transmission frequency and the received frequency and is directly proportional to the distance.
The level meter comes with an optional second current output that can be used for displaying measurements such as volume. In addition, it offers a wide variety of open (horn) and closed (drop) antenna configurations that can easily be interchanged by the user.
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