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12 Daniel 3812 Liquid Ultrasonic Flow meter design
Section 1: Introduction Daniel 3812 Liquid Ultrasonic Flow Meter Installation Manual
May 2015 3-9000-765 Rev H
Figure 1-8 Optional local display and glass endcap
The Daniel 3812 Liquid Ultrasonic Flow Meter is a two-path (four 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 in the flow direction 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.
Computer simulations of various velocity profiles demonstrate that multiple measurement
p
a
ths provide an optimum solution for measuring asymmetric flow. The Daniel 3812 Liquid
Ultrasonic Flow Meter utilizes two cross-bore, parallel-plane measurement paths, offers a high
degree of repeatability, bi-directional measurement and superior low-flow capabilities without
the compromises associated with conventional technologies.
The Daniel 3812 Liquid Ultrasonic Flow Meter’s U.L. safety listing is accomplished through the
c
o
mbination of an explosion-proof Transmitter Electronics Enclosure that houses the CPU
Module, Power Supply board, I.S. Barrier board, Backplane board and optional LCD Display
board.
NOTE: The op
tion
al LCD Display requires firmware v1.04 and Uboot version, January 31, 2013.
The Base Electronics Enclosure is intrinsically safe and houses the Acquisition Module, the
ac
quisition cable and wiring. The Intrinsically safe transducers and cable assemblies are
designed for Class 1, Division 1, Groups C and D areas without need of further protection when
installed in accordance with the field wiring diagram (refer to Daniel drawing DMC - 004936, see
Appendix A and Section 1.8).