Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter Manuel d'utilisateur télécharger pdf (Page 28)

Rev. 5/09 - 2.10 - TFXP

2. Place the upstream transducer in position and secure with a

mounting strap. Straps should be placed in the arched groove

on the end of the transducer. A screw is provided to help hold

the transducer onto the strap. Verify that the transducer is true

to the pipe — adjust as necessary. Tighten the transducer strap

securely.

3. Place the downstream transducer on the pipe at the calculated

transducer spacing. See Figure 2.5. Using firm hand pressure,

slowly move the transducer both towards and away from the

upstream transducer while observing signal strength. Signal

strength can be displayed on the TFX display or on the main

data screen in ULTRALINK™. See Part 4 of this manual for

details regarding the ULTRALINK™ software utility. Clamp the

transducer at the position where the highest signal strength is

observed. The factory default signal strength setting is 5

percent, however there are many application specific conditions

that may prevent the signal strength from attaining this level. If

after trying alternate transducer locations and/or mounting

modes the signal strength remains below 5 percent, then

reducing the Low Signal Cutoff setting may be necessary. A

minimum signal strength of 2 percent is acceptable as long as

the 2 percent signal is maintained under all conditions.

(Top view of pipe)

Figure 2.5 — Transducer Positioning

Transducer

Positioning

PART 2 - TRANSDUCER & RTD INSTALLATION

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Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter Manuel d'utilisateur Page 28