Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual

Section 1: Introduction

3-9000-771 Rev A

May 2012

 

 

 

Computer simulations of various velocity profiles demonstrate that eight measurement paths provide an optimum solution for measuring asymmetric flow. The Daniel 3818 LNG Liquid Ultrasonic Flow Meter utilizes eight cross-bore, parallel-plane measurement paths to offer a high degree of accuracy, repeatability, and superior low-flow capabilities without the compromises associated with conventional technologies. The meter is comprised of two 3810 Transmitter Electronics, designated as co-located primary (master) and secondary (slave) electronics. A synchronization cable connects the primary and secondary Acquisition Modules at the J6 terminal block and the liquid ultrasonic flow meter firmware controls the transducers firing sequencing. The Daniel 3818 LNG Liquid Ultrasonic Flow Meter with the 30” diameter meter body utilizes 60 degree port angles with LT-07 transducers.

These features make the Daniel 3818 LNG Liquid Ultrasonic Flow Meter the best choice for cryogenic custody transfer applications as shown in the following sections of this manual.

The Daniel 3818 LNG Liquid Ultrasonic Flow Meter’s U.L. safety listing is accomplished through the combination of a remote mounted, explosion-proof Transmitter Electronics Enclosure that houses the CPU Module, I.S. Barrier Module, Power Supply Board, and the Backplane Board. The flameproof Base Electronics Enclosure houses the Acquisition Module and the acquisition board cable connections. 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 the meter body (spool piece).

3818 LNG Liquid Ultrasonic Flow Meter design

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