2.2.5 ​Probe installation method

Generally, the probe should be set up using a V​ or Z configuration. A small number of specific applications may require an N​ or W​ configuration. The four configurations are described below:

● V configuration: In general, tubing with a diameter of 50 ~ 300 millimeters takes this configuration. The two probes are mounted on the same side of the tubing, with the resulting ultrasound signal having a V-shaped bounce. Because the probes are on the same side, it is easier to measure the distance between probes, and because the ultrasound only reflects once, a balanced signal strength is achieved.

● Z configuration: Generally used in diameters of more than 300 millimeters, the ultrasonic signal is not reflected, thus helping to maintain signal strength. This helps avoid a weak or distorted signal. However, because the probes are mounted diagonally on opposite sides of the tube, measuring the probe distance is more difficult.

● N configuration Generally used in tubing of less than 50 millimeters, the probes are mounted diagonally on opposite sides of the tube, making it more difficult to measure the distance between them. The ultrasonic signal is reflected two times, making three paths, and thus increasing signal flight time and enhancing measurement accuracy in thin-diameter pipes. This method is only recommended if the V configuration cannot be adjusted to produce the ideal signal state.

● W configuration Generally used in tubing of less than 50 millimeters, the ultrasonic signal is reflected three times, making four paths, and thus extending signal flight time. There are cases when this method can improve measurement accuracy for small tubes. This configuration makes measuring probe distance easier than the N configuration does, because the probes are mounted on the same side of the tubing, but it is not recommended unless it is otherwise impossible to attain the ideal signal state.

● Pipeline Installation Location Liquid flow in the pipe will be obstructed by bends and other forms of obstacle. In order to ensure flow measurement precision, probes should be installed in such a manner as to avoid confusion in the flow field. The following table shows a variety of common pipeline configurations, and the corresponding upstream and downstream probe recommendations. The installation location for the upstream and downstream probes should correspond as much as possible to the positions recommended in the table (select the situation that most closely meets actual site conditions).

● Probe distance calculation Set the initial value of each parameter in the meter setup. After setting the values, find the probe spacing item in the initial value menu. After the values have been entered, this will display the probe distance calculation results. Please set up the probe in accordance with this distance. Setup accuracy will directly affect the accuracy of the measurement results. It is recommended that adjust TOM/TOS to 99.90%~100.10%