SENSOR COUPLING
For permanent or temporary bonding, the following are recommended:
a) Dow Corning silicon compound #4 (supplied)
Additional supply: order Greyline Option CC
b) High Temperature compound (supplied with Sensor Option SE3H)
Additional supply: order Greyline Option AP-1W
c) Water-based sonic compound: Order Greyline Option CC30
d) Electrocardiograph gel
e) Petroleum gel (Vaseline)
The above are arranged in their order of preferred application.
d & e are only good for temporary bonding at room temperature.
DO NOT USE: Silicon RTV caulking compound (silicon rubber).
Use the PC3 pipe clamp (supplied) as illustrated above or
use a loop of electrical tape for temporary mounting.
Apply silicon coupling compound #4 to the coloured
face of the sensor. A bead, similar to toothpaste on a
toothbrush, is ideal. Do not overtighten (crush the
sensor).
The sensor must be fixed securely to the pipe with coupling material
between the sensor face and the pipe. Sensor installation with
excessive coupling compound 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 (e.g. Petroleum Gel) may
gradually sag away from the sensor resulting in reduced signal
strength and finally complete loss of signal. Warm temperatures,
moisture and vibration will accelerate this process. Dow Corning Silicone Compound #4 as supplied
with the DFM-IV (and available from Greyline Instruments) is recommended for semi-permanent
installations.
Page 13
DFM-IV Doppler Flow Meter
Manual Series A.6
TAPE OR
CLAMP
COMPOUND
PIPE
SENSOR
COMPOUND
SENSOR
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