SILVER AUTOMATION INSTRUMENTS LTD.

Ultrasonic Level Meter Installation

Reasonable installation is critical factor of the instrument’s normal working.

Installation considerations
General

  • Installation must be carried out by trained person in accordance with the manual.
  • The temperature of the process may not exceed 75℃,and the pressure may not exceed ±0.1 MPa.
  • The use of metallic fittings or flanges is not recommended.
  • For exposed or sunny locations a protective hood is recommended.
  • Make sure the distance between the ultrasonic level probe and the maximum level exceeds the blacking distance, because the probe cannot detect any liquid or solid surface closer than the blacking distance to the probe’s face.
  • Install the ultrasonic level sensor at right angles to the surface of the measuring material.
  • Obstructions within the beam angle generate strong false echoes. Wherever possible, the ultrasonic level transmitter should be positioned to avoid false echoes.
  • The beam angle is 8°, in order to avoid large echo loss and false echo, the ultrasonic level probe should not be mounted closer than 1 m to the wall. It is advisable to maintain a distance of at least 0.6m from the center line of the probe for every foot (10cm per meter) range to the obstruction.

Liquid surface conditions Suggestions


Foaming liquids can reduce the size of the returned echo because foam is a poor ultrasonic reflector. Mount an ultrasonic transmitter over an area of clear liquid, such as near the inlet to a tank or well. In extreme conditions, or where this is not possible, the ultrasonic level transmitter may be mounted in a vented stilling tube provided that the inside measurement of the stilling tube is at least 4 in. (100 mm) and is smooth and free from joints or protrusions. It is important that the bottom of the stilling tube stays covered to prevent the ingress of foams.

Avoid mounting the ultrasonic level probe directly over any inlet stream.

Liquid surface turbulence is not normally a problem unless it is excessive. The effects of turbulence are minor, but excessive turbulence can be dealt with by advising the technical parameters or a stilling tube.

Solid surface conditions Suggestions

For fine-grained solids, the ultrasonic level sensor must be aligned with the product surface.

Hints for in-tank effects

1. Stirrers or agitators can cause a vortex. Mount the Ultrasonic level transmitter off-center of any vortex to maximize the return echo.

2. In non-linear tanks with rounded or conical bottoms, mount the ultrasonic level transmitter off-center. If needed, a perforated reflector plate can be installed on the tank bottom directly under the level transmitter center line to ensure a satisfactory return echo.

3. Avoid mounting the level transmitter directly above pumps because the transmitter will detect the pump casing as the liquid falls away.

4. When install to the cold area, should choose the lengthen sensor of the level meter, make the sensor extend into the container, shun frost and icing.

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