Ultrasonic level measurement questions and answers
Application of Ultrasonic Level Gauges: Ultrasonic level sensors work primarily to detect liquid levels with sound waves. They usually operate in the frequency range between 20 kHz to 200 kHz. Read the following ultrasonic level measurement questions and answers
Ultrasonic level measurement
- How do ultrasonic level sensors work?
The ultrasonic sound pulse is pulsed 4 times per second from the base of the converter. The pulse travels through the air, is reflected against the process environment, and returns to the transducer. The pulse time sensor measures the flight between sound production and reception and translates this into the distance or height of the liquid level inside the ship.
2- What are the advantages of ultrasonic level sensors?
Many functional fluids have challenging properties that negatively affect contact sensor performance, maintenance and / or replacement costs. Examples include corrosive liquids, coatings, scaling, viscosity and grease. Ultrasonic sensors are non-contact and therefore impervious to these properties.
- What should I avoid with ultrasonic level sensors?
Program variables for ultrasonic prevention include severe foam, steam, turbulence, or installation in long joints with narrow blenders. Foam, steam and turbulence can absorb or eliminate a significant portion of the return signal. Long elevator connections can interfere with the audio signal path. Proper product selection and installation is important.
Ultrasonic surface sensor signal
- What is a 4-20 mA signal?
4-20 mA indicates the measuring range of the sensor. The 4 mA setpoint is usually near the bottom of the empty tank, or the maximum measuring distance from the sensor. The 20 mA set point is usually located near the top of the full tank or the shortest measuring distance from the sensor. When the tank is empty and when the tank is full, the sensor produces a proportional 4 mA signal.
2- What are the benefits of a 4-20 mA signal?
4-20 mA analog signals have the following advantages:
- They also carry the same two wires of power and signal.
- 4-20 mA is easily converted to 1-5 VDC input through a 250 ohm resistor or 1-10 VDC input through a 500 ohm resistor.
- With shielded cable, 4-20 mA is resistant to radiation interference and induction noise.
- What is the maximum signal distance of 4-20 mA?
This sensor can be installed up to 1000 feet from its termination point using a protective cable, 18-20 gauges 18-20 wires and 24 VDC power supply. The total resistance of the ring should not exceed 900 ohms (change from seller to seller).
4- Do I have to configure the measurement length of 4-20 mA?
Although 4mA and 20mA configuration is not essentially necessary, it is recommended because it optimizes sensor installation performance.
- Can the measurement length be reversed from 4-20 mA to 4-20 mA?
Yes, the sensor can be adjusted so that the 20 mA set point is empty and the 4 mA set point is full.
6- Can I put a loop level indicator in series with a 4-20 mA signal?
Yes, as long as the total resistance of the loop is less than 900 ohms.
Selection of ultrasonic level sensors
- What are NPT and G installation issues and where is it used?
NPTs (National Pipe Issues) are prominent American standard topics applicable in North America, South America, and parts of Asia. G (metric) yarns are a European standard used throughout Europe and parts of Asia.
۲. How can I choose the best ultrasonic level sensor performance for optimal performance?
Select the sensor range that covers the tank height with a margin of at least 25%. In challenging applications with light foam, steam, and / or turbulence, choose a sensor range that is twice the height of the tank. An additional sensor improves performance in such situations.
- What is Ultrasonic Surface Sensor Material Made of?
Fireproof polycarbonate electronic enclosures, polypropylene cables and PVDF converters. The washer is mounted on Vuitton.
Installation of ultrasonic level sensor
- How can I identify the best installation location for my ultrasonic level sensor?
The sensor must be such that the path of the audio signal is free from obstruction of the side walls, ladders, pipes, mixers and other tools. The sensor must be mounted on a liquid surface and / or perpendicular to the liquid surface. If there is foam, steam or significant turbulence, install the sensor in a standing tube.
۲. What type of mounting fittings are recommended for the ultrasonic level sensor?
This sensor can be widely installed in tank adapters, couplings, flanges, brackets and standing pipes of suitable size relative to the converter. Avoid installing types that push the transducer substantially into the fittings, or squeeze the transducer against the internal stop of the pipe. Use plastic fittings whenever possible.
- How long should the ultrasonic level sensor be installed inside the joints?
In most installations, the sensor is just tightened. If you use a wrench or tool, be careful not to tighten the sensor too much.
4- What is the maximum height of the flange lift at which the ultrasonic level sensor can be installed?
The sensor can be raised up to 12% in a 6 قط diameter elevator, 8% in a 4 قط diameter elevator, 6% in a 3’s diameter blender and 3% in a 2’s diameter blender.
5- What is the best size of the tube ID to install the ultrasonic level sensor in a standing tube?
Sensors with 1 converter must be installed in 2-inch standing tubes. Sensors with a 2-inch converter must be installed in 3-inch standing tubes.
- What is the best way to install my ultrasonic level sensor on a sloping tank or dome?
In plastic tanks, use the plastic self-adjusting bulk fittings that make the sensor perpendicular to the liquid surface. In metal or fiberglass tanks, use a plastic flange connection with a short lift that is suitable for slope.
- What is the best way to install my ultrasonic level sensor with high tank or open bar?
The side mount bracket is a good choice. Users can also produce equivalent brackets based on custom sizes or materials required.
- Can I install two ultrasonic level sensors in an enclosed tank?
Normally only one sensor is installed in each tank. If you want to install two sensors, the signals must be separated so that they do not talk about interference. This can be done by installing one or both sensors in a standing tube.
9- Can the ultrasonic surface sensor sink in the liquid?
NEMA 6 chamber sensors are designed to withstand rare immersions for short periods of time. NEMA 4 containers are designed to withstand repeated sprays equivalent to direct hose spray and should never be submerged. In general, the sensor should be in place to prevent immersion or direct spray under normal circumstances.
Ultrasonic level sensor configuration
- How to configure an ultrasonic level sensor for an application?
- Depending on the model, the sensors are configured using a display module or software.
- The software is downloaded to your computer for free and the sensor is configured via our USB adapter.
2- If the power is lost, the ultrasonic level sensor loses its configuration?
- No, the sensors have non-volatile memory that can only be cleared by factory reset.
- What does a factory reset do to an ultrasonic level sensor?
- Factory Reset Clears the user’s previous settings and returns the sensor to its original factory reset.
Ultrasonic surface sensor troubleshooting
- Is the current of the ultrasonic level sensor 0 mA?
Check the wiring of an open circuit and verify the power supply.
2- Does the ultrasonic surface sensor current jump between 19 mA and 20 mA?
Check the installation connections to ensure that they comply with our instructions. If the sensor is mounted on a metal fitting, replace it with a plastic fitting.
- Is the current of the ultrasonic level sensor> 22 mA?
Check the wiring for a short circuit.
- Does the ultrasonic level sensor jump to LOST or insecure mode?
Check the set point for the full height configuration. Make sure that the full height setting corresponds to the full surface of the tank (as measured from the bottom of the empty tank to the top), not the distance from the installed sensor to the liquid level (as measured from the bottom sensor). What is the range, tank height, full height and dead band? Check that the sensor is installed correctly. Make sure there are no surface surfaces or obstructions in the beam path. If so, install the sensor in a standing tube to separate the measuring point from the floor, remove the blockage, or move the sensor.
- Is the current of the ultrasonic level sensor opposite to the liquid level?
Check the output when empty. Make sure the setting is empty with 4 mA or 20 mA.
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