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Operation and Installation

How to install Clamp-on Ultrasonic Flowmeters

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Update time : 2017-03-23 11:37:00

1. Choosing the Installation Place

To ensure measurement accuracy and stability, the installation point of transducers should be on the straight pipe full of well-distributed fluid (when installing, the pipe must be full of liquid), and should follow the given points:
• Pipe must be full of liquid that is uniform and easy for the ultrasonic pulse to travel through (vertical pipe or horizontal pipe)
• Avoid installing the transducer at the highest point of the pipe system or on the vertical pipe with free exit (down flow)

• For the open pipe or half full pipe, the transducers should be installed at the bottom of U pipe

• The temperature and pressure on the installation point should be within the workability of the transducers
• Pay attention to the pipe's inner wall and check for pollution build-up. Select a pipe without any or very little build-up of sediment because it may interfere with the signal
• In case of horizontal piping, mount the detector within 45° from the horizontal plane. Otherwise, the measurement may be impossible if bubbles stay in the upper part of the piping or if deposits are accumulated in the lower part of the piping. In case of vertical piping, the detector may be mounted at any position on its periphery provided that the flow is upward.


2. Length of The Straight Pipe

The length of upstream and downstream straight pipe of the ultrasonic transducer should be long enough to ensure accurate measurements.

The above figure shows the installation point of transducers when a compressor is used in the pipeline.


3. Transducer Installation Method

Before installing, start by cleaning the installation area: remove any rust, paint, and anti-rust layers. Then polish the area using a clean cloth with either alcohol or acetone. Apply a sufficient amount of grease at the installation area and clamp the transducers tightly on the pipe. The grease is used to eliminate any gaps between the transducer and the pipe wall.

Note: If enough grease is not applied or the transducers are not clamped to the wall tightly, the precision of measurement may be effected.


4. Transducer Installation Space

Installation space of the clamp-on type transducer is the inner distance between the two transducers when they are facing each other. After giving the input of the required parameters to the menu of the converter, check the display on the parameter M25 to get the installation space.

5. Transducer Installation Method

There are two types of the installation methods i.e. the V method and the Z method.

V method is a standard installation method and convenient to use for precise measurement of flow. While installing the two transducers, they’re horizontally aligned. They are suitable for pipe diameter range ½" to 16" (DN15 mm-DN400 mm).

When the pipe diameter is wide, or there are suspended matters in the fluid, or the scaling is too thick and interferes with the normal functioning of the flowmeter and weakens the signal in a V method installation, then Z method installation is used. It is also called the single sound path as it can directly transfer the pulse without any reflection required as is required in case of V method and therefore has less signal attenuation.

When installing the transducers, the pipe area where the transducers are to be installed, must be clean The shield cable must be properly connected and proper sealants must be applied to the transducers to prevent the water from entering inside the transducers Use stainless steel band straps to fix the transducers and to prevent it from moving Apply enough couplant around the area, so that transducers touch the pipe and prevent air, sands, and rust that interfere with the pulse transfer.

6. Instrument Well Construction Requirements

To install transducers in an instrument well, there must be enough installation room and should be convenient for people to stand up and work. Distance between the pipe wall and well wall is at least above 22 inch, width is more than (D+22x2) inch, cement pipe width is more than (D+28x2) inch, and the instrument well axial width L is more than D+48 inch. When installing transducers, avoid the placement on the flange, welding line, reducing. Do best to install transducers in the range of ±45° of the horizontal position of pipe axis.

7. Quick Pipe Parameters Setting

The user must set the parameters when measuring the following:
1). Pipe outer diameter
2). Pipe wall thickness
3). Pipe material
4). Liner parameter (if having liner, then the liner thickness and sound velocity)
5). Fluid types
6). Transducers type
7). Transducers installation method
8). Solidification parameter