There is a certain existing beam angle while transducer radiating ultrasonic pulses. There should be no barriers between the lower edge of transducer and surface of target medium. Therefore it is highly recommended to avoid facilities inside vessels, such as ladders, limit switches, heating spirals, struts and etc, during the mounting process. A false echo storage must be carried out during the installation in this case.Furthermore, ultrasonic waves must not intersect the filling streams.
Be cautions during the installation when: the highest level of target medium must Not enter into blanking zone; the instrument must keep certain distance to vessel walls; every possible measure needs to be taken to position the instrument so that the direction of transducer emission is perpendicular to the surface of measured medium. The installation of instruments in explosion proof area must abide by relevant local or federal safety regulations.Aluminium housing should be used for intrinsically safe explosion proof version, which is also applicable in explosion proof areas. The instrument must be connected with ground in this case.
Illustration
The lower edge of probe is the reference plane for measurement.
1. Blanking Zone (menu1.9)
2. Empty (menu1.8)
3. Max.Adjustment(menu1.2)
4. Min.Adjustment(menu1.1)
Note: The highest level of measured medium must not enter into blanking zone while ultrasonic level instrument is in operation
Mounting Position
Minimum distance of 200mm between instrument and vessel wall must be assured while mounting AVI-SU01 or AVI-SU02
1. Reference Plane
2. Center of Vessel or Symmetrical Axis
Minium distance of 500mm between instrument and vessel wall must be assured while mounting AVI-SU03
1 Reference Plane
The best mounting position for a conical vessel with flat top is the center of its top, as the effective measurement can reach the bottom of vessel.
Illustrative Diagram on Installation
1 Wrong: Fail to turn the antenna perpendicular to the surface of target medium.
2 Wrong: Instruments are mounted in the center of concave or arched vessel tops, which results in multiple echoes.
Installation Methods
Installation with Swivelling Holder
Mount AVI-SU03 with swivelling holder
Use flange to mount AVI-SU03
Damp-proof
In order to avoid dampness under outdoor or humid indoor conditions or for those instruments mounted on cooling/heating vessels, seal rings used on cables should be screwed tight, plus the cable must be bended downward outside cable entry, indicated on the diagram below:
Socket
The transducer end must at least protrude 10mm out of socket.
In case of strong reflective properties of target medium (Fig 1) and big socket diameter, you can mount instruments on sockets higher than the antenna length. The recommended values for socket heights are shown in the il lustration below. The socket end should be smooth and burr-free, if possible also rounded. Moreover, false echo storage must be carried out afterwards. On the contrary, if the reflective properties of medium are weak (Fig 2), you are advised to heighten the mounting position of instruments and also use a standpipe (optional) to reduce the influence caused by socket.
Agitator
If there are agitators in vessels, instrument must be mounted as far away from agitators as possible. Once installation completed, a false echo storage should be carried out while agitators in motion to eliminate negative influence caused by false echo of agitators. You are advised to opt for installation with standpipe if foam or wave is generated due to the action of agitators.
Foam
Due to the action of filling, stirring or other processes inside vessels, dense foams are formed on the surface of some liquid medium, which could attenuate emitting signals considerably. You are advised to mount the instrument inside a standpipe or opt for a radar level instrument if the generation of foam incurs measurement errors. Guided wave radar level instrument is the best option for similar applications thanks to the fact that it is unaffected by foam generation.
Airflow
You are advised to mount the instrument inside a standpipe or opt for a low frequency radar level instrument or radar level instrument with guided microwaves in the event of strong airflow presence in vessels, e.g., outdoor installation with gusty wind or presence of vortex inside vessels.
Installation with Standpipe
1 Vent hole of diameter（5～10）mm. You are advised to opt for installation with standpipe (or bypass tube) to avoid the influence on measurement caused by barriers inside vessels, foam generation or air vortex. If the measurement is undertaken by AVI-SU0X inside the standpipe the inner diameter of standpipe should be at least bigger than the outside diameter of transducer. Please see Dimensional Drawings for actual sizes. Avoid large cracks or welding seam when connecting standpipe. False echo storage must be carried out as well in this case.
Ultrasonic Level Instrument (Remote Version)
Principle
The operating principle of ultrasonic level instrument is that high-frequency ultrasound pulses transmitted by the transducer (probe) are reflected when meeting the dielectric surface to be measured, and part of the reflected echoes are received by the same transducer and converted into electrical signals. An ultrasonic pulse propagates at the speed of sound, and the time interval of transmitting and receiving ultrasound pulses is proportional to the distance between the transducer and the dielectric surface to be measured. The relation between this distance value S, the speed of sound C and the transmission time T can be expressed using the formula: S = CxT/2. The transmitted ultrasonic pulses have a certain width that result in overlap of the reflected waves within a small area closer to the transducer with the transmitted waves, so it is impossible to identify them and measure its distance value. This area is called the blind zone. The size of blind zone is relates to the model of ultrasonic level instrument.
Features
With advanced microprocessor and unique EchoDiscovery echo processing technology, the radar level instrument can be applied to various complex working conditions.
The “Virtual Echo Learning” function enables the instrument to correctly identify true echo in the working conditions where there are multiple virtual echoes to obtain correct measurements.
The transducer has a built-in temperature sensor which can provide temperature compensation for the measured values.
With the best patented technology of acoustic matching, the ultrasonic transducer can radiate its transmitting power more effectively and improve signal intensity to achieve accurate measurements.
Instrument Overview:
AVI-SU04
Application: Liquid level measurement in all industrial sectors, especially in water treatment industry.
Measurement Range: Liquid: 0.4…10m
Process Connection: G1A
Housing Material of Transducer: PU/PC
Process Temperature: -40…80 °C
Process Pressure: -0.2…1bar
Explosion-proof Grade: Exm II T6
Installation Requirements:
The transducer has an angular aperture when transmitting ultrasonic pulses. Within the area of radiation by the transmitted ultrasonic beam from the bottom edge of transducer to the dielectric surface to be measured, no barrier is allowed, so tank facilities such as ladder, limit switch and bracket should be avoided during installation whenever possible. In this case, it is needed to conduct “Virtual Echo Learning” in installation. In addition, it should be noted that the ultrasonic beam is not allowed to meet with the loading flow.
When a transducer is installed, it also should be noted that the top level cannot enter the blind zone; some distance must be kept between the transducer and tank wall; the installation of transducer should try to make its transmitting direction perpendicular to the liquid level. The installation of transducer in an explosion-proof area shall follow relavent installation provisions for explosion-proof dangerous areas by the state.
AVI-SU05
Application: Liquid level measurement in all industrial sectors, especially in water treatment industry.
Measurement Range: Liquid: 0.6…20m
Process Connection: G1A
Housing Material of Transducer: PU/PC
Process Temperature: -40…80 °C
Process Pressure: -0.2…1bar
Explosion-proof Grade: Exm II T6
Installation Requirements:
The transducer has an angular aperture when transmitting ultrasonic pulses. Within the area of radiation by the transmitted ultrasonic beam from the bottom edge of transducer to the dielectric surface to be measured, no barrier is allowed, so tank facilities such as ladder, limit switch and bracket should be avoided during installation whenever possible. In this case, it is needed to conduct “Virtual Echo Learning” in installation. In addition, it should be noted that the ultrasonic beam is not allowed to meet with the loading flow.
When a transducer is installed, it also should be noted that the top level cannot enter the blind zone; some distance must be kept between the transducer and tank wall; the installation of transducer should try to make its transmitting direction perpendicular to the liquid level. The installation of transducer in an explosion-proof area shall follow relavent installation provisions for explosion-proof dangerous areas by the state.
AVI-SU06
Application: Liquid and solid level measurement in all industrial sectors.
Measurement Range:
Liquid: 0.8…40m
Solid: 0.8…20m
Process Connection: G1A，M105x2
Housing Material of Transducer: PU/PC
Process Temperature: -40…80 °C
Process Pressure: -0.2…1bar
Explosion-proof Grade: Exm II T6
Installation Requirements:
The transducer has an angular aperture when transmitting ultrasonic pulses. Within the area of radiation by the transmitted ultrasonic beam from the bottom edge of transducer to the dielectric surface to be measured, no barrier is allowed, so tank facilities such as ladder, limit switch and bracket should be avoided during installation whenever possible. In this case, it is needed to conduct “Virtual Echo Learning” in installation. In addition, it should be noted that the ultrasonic beam is not allowed to meet with the loading flow.
When a transducer is installed, it also should be noted that the top level cannot enter the blind zone; some distance must be kept between the transducer and tank wall; the installation of transducer should try to make its transmitting direction perpendicular to the liquid level. The installation of transducer in an explosion-proof area shall follow relavent installation provisions for explosion-proof dangerous areas by the state.
AVI-SU07
Application: Liquid and solid level measurement in all industrial sectors.
Measurement Range:
Liquid: 1.2…80m
Solid: 1.2…40m
Process Connection: G1A，M105x2
Housing Material of Transducer: PU/PC
Process Temperature: -40…80 °C
Process Pressure: -0.2…1bar
Explosion-proof Grade: Exm II T6
Installation Requirements:
The transducer has an angular aperture when transmitting ultrasonic pulses. Within the area of radiation by the transmitted ultrasonic beam from the bottom edge of transducer to the dielectric surface to be measured, no barrier is allowed, so tank facilities such as ladder, limit switch and bracket should be avoided during installation whenever possible. In this case, it is needed to conduct “Virtual Echo Learning” in installation. In addition, it should be noted that the ultrasonic beam is not allowed to meet with the loading flow.
When a transducer is installed, it also should be noted that the top level cannot enter the blind zone; some distance must be kept between the transducer and tank wall; the installation of transducer should try to make its transmitting direction perpendicular to the liquid level. The installation of transducer in an explosion-proof area shall follow reagent installation provisions for explosion-proof dangerous areas by the state.
AVI-SU08
Application: Liquid and solid level measurement in all industrial sectors.
Measurement Range:
Liquid: 1.6…100m
Solid: 1.6…80m
Process Connection: G1A，M105x2
Housing Material of Transducer: PU/PC
Process Temperature: -40…80 °C
Process Pressure: -0.2…1bar
Explosion-proof Grade: Exm II T6
Installation Requirements:
The transducer has an angular aperture when transmitting ultrasonic pulses. Within the area of radiation by the transmitted ultrasonic beam from the bottom edge of transducer to the dielectric surface to be measured, no barrier is allowed, so tank facilities such as ladder, limit switch and bracket should be avoided during installation whenever possible. In this case, it is needed to conduct “Virtual Echo Learning” in installation. In addition, it should be noted that the ultrasonic beam is not allowed to meet with the loading flow.
When a transducer is installed, it also should be noted that the top level cannot enter the blind zone; some distance must be kept between the transducer and tank wall; the installation of transducer should try to make its transmitting direction perpendicular to the liquid level. The installation of transducer in an explosion-proof area shall follow relavent installation provisions for explosion-proof dangerous areas by the state.
AVI-AIM
Application: Used to adjust the transmitting angle of probe in ultrasonic solid level measurement (Remote Version) to achieve better echo signals.
Material: Stainless steel 316L
AVI-SUCL
Application: Measurement of liquid level, liquid level difference, average value and open channel flow in various industrial sectors. Matched ultrasonic wave probe SU04/SU05.Max Measurement Range: Liquid: 20m
Housing Material: PC
Process Temperature: -40~80 °C
Display/Programming: Dot matrix LCD direct display of echo curve
AVI-SUCS
Application: Measurement of liquid level, liquid level difference, average value and open channel flow in various industrial sectors. Matched ultrasonic wave probe SU06/SU07/SU08.Max Measurement Range:
Liquid: 100m
Solid: 60m
Housing Material: PC
Process Temperature: -40~80 °C
Display/Programming: Dot matrix LCD direct display of echo curve.
