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6 3818 LNG Liquid Ultrasonic Flow Meter design
Section 1: Introduction Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual
May 2012 3-9000-771 Rev A
1.5 3818 LNG Liquid Ultrasonic Flow Meter design
The Daniel 3818 LNG Liquid Ultrasonic Flow Meter is a remote mount, dual transmitter
electronics, eight-path (sixteen transducers) in-line meter designed to measure the difference in
signal transit time with and against the flow across one or more measurement path(s). A signal
transmitted with the direction of flow travels faster than one transmitted against the flow
direction. Each measurement path is defined by a transducer pair in which each transducer
alternately acts as transmitter and receiver. The meter uses transit time measurements and
transducer location information to calculate the mean velocity.
Figure 1-2 3818 LNG Meter with remote mount electronics and band shroud assembly
A. Explosion-proof transmitter enclosure
B. Bracket cover with synchronization cable
C. Intrinsically-safe base enclosure includes Acquisition Module
A.
C.
E.
D.
D. Rigid and flexible conduit for transducer cables
(CPU Module, Power Supply, I.S. Barrier Board, and Backplane Bd.)
B.
E. Meter - body and shroud cover for transducers and cables assemblies