Greyline Instruments DFS 5.1, User Manual

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Page 9
DFS 5.1 Doppler Flow Switch
One PCK2 Pipe Clamp Kit is included with each Greyline DFS 5.1. It includes recommended silicone
coupling compound in a plastic applicator, a stainless steel sensor bracket, and a stainless strap for pipe
diameters up to 16” 406 mm. Additional pipe clamps (optional) may be attached for larger diameter
pipes.
Thread the strap through the bracket and mount loosely on the pipe ready for Sensor coupling.
SENSOR COUPLING
Prepare a pipe clamp to secure the sensor. Apply coupling compound to the coloured face of the sensor.
A bead (similar to toothpaste on a toothbrush) is ideal. Press the sensor on to the pipe and secure with
the clamp. DO NOT over tighten.
For proper operation the transducer must be fixed securely to the pipe with coupling material between
the transducer face and the pipe. Sensor installation with excessive coupling compound or use of epoxy
can result in gaps or voids in the coupling and cause errors or loss of signal. Insufficient coupling
compound will create similar conditions.
Over time temporary coupling compounds may gradually sag away from the sensor resulting in reduced
signal strength and finally complete loss of signal. Warm temperatures, water and vibration will
accelerate this process. Loss of Signal will be indicated by erratic performance of the DFS 5.1.