FlowScanner User Guide ducer must be mounted so that stem travel will deflect the probe. The transducer must be securely mounted with the probe parallel to the valve stem and so that it can move freely with the movement of the valve stem. Non–parallel mounting will cause the probe tip to move slightly on the position feedback extension. If this surface is not flat, some error will be introduced as the tip moves across the surface. This can be detected if the travel reading does not return to zero (within .0001) after the valve is stroked. A small error will not affect the evaluation but will show up in the graphs. The transducer mounting position should provide some pre–compression of the probe beyond its free position and provide adequate coverage of the stroke range. The travel reading can be zeroed from the keyboard. 5.4.1.1.2
Transducer for Rotary Valve
W6672
Rotary Transducer
The rotary transducer measures 360 of rotation and has 0.0075 resolution. The transducer must be mounted perpendicular to the valve shaft. A slight offset can be compensated for by the flexible coupling. A probe with a plate for mechanical connection or a suction cup is used to connect to the shaft. Error may be introduced if the suction cup slips. This can be eliminated by the use of double sided tape to secure the cup to the shaft.
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