Max 3°
(1.3"/ft)
0,11m/m
C
i.e. D Min | = | 0.45m | (18”) |
D Max | = 11m | (433”) | |
C | = | 0.3m | (12”) min to 0.88m (36”) |
D
•If the transmitter is mounted in an enclosed tank, avoid mounting the transmitter in the centre of the tank roof as this could act as a parabolic reflector and create unwanted echoes. Avoid applications where heavy condensation could form on the transducer face.
•If the transmitter is mounted in a
•If the transmitter is used in environments where direct sunlight can cause very high surface temperatures on exposed instruments, it is recommended that the installer should construct a suitable
•Remember that the minimum operating range of the transmitter is 0.45m. The transmitter will not detect any liquid surface closer than 0.45m to the transmitter face.
3.1.2 Liquid surface conditions
•Foaming liquids can reduce the size of the returned echo as foam is a poor ultrasonic reflector. It is always preferable to mount an ultrasonic transmitter over an area of clear liquid, such as near the inlet to a tank or well. In extreme conditions, or where this is not possible, the transmitter may be mounted in a vented stilling tube provided that the inside bore of the stilling tube is at least 100 mm (4”) and is smooth and free from joints or protrusions. It is also preferable that the bottom of the stilling tube does not become uncovered, thus preventing the ingress of foams.
•Beware of mounting the transmitter directly over any inlet stream.
•Liquid surface turbulence is not normally a problem unless it is excessive. In most cases, the effects of turbulence are minor, with excessive turbulence being catered for by fine tuning the transmitter on site if necessary.
7 | IP2046/IM | |
Nov 2006 | ||
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