Dwyer UFC User Manual download pdf (Page 14)

2: Installation

2.3 Installing the Ultrasonic Transducers

2.3.1 Transducer positioning

Figure 2.2 Locating the transducers

Figure 2.3 Transducer holder attachment (reflex vs. diagonal mode)

The UFC equipment expects a uniform flow profile as a distorted flow will produce unpredictable measurement errors. Flow

profile distortions can result from upstream disturbances such as bends, tees, valves, pumps and other similar obstructions.

To ensure a uniform profile, the transducers must be mounted a sufficient

distance away from any cause of distortion.

Flow

Valid transducer location

10 x Diameter 20 x Diameter

45°

Uniform Flow Profile Distorted Flow Profile

Possible

sludge

Air

Flow

Transducer

Holder

45°

In many applications an even flow velocity profile over a full 360° is unattainable due to, for example, air turbulence at the

top of the flow and possibly sludge in the bottom of the pipe. Experience has shown that the most consistently accurate

results are achieved when the transducer holders are mounted at 45° with respect to the top of the pipe.

Possible

sludge

Air

Reflex Mode

Diagonal Mode*

Transducer

Transducer Holder 2

Transducer Holder

Transducer Holder 1

Transducer Holder 2

45°

*Note: when using the UFC in the ‘diagonal’ mode an additional transducer holder and fixing kit is required.

Holder

Holder 1

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Dwyer UFC User Manual Page 14