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12 Daniel Mark III Ultrasonic Gas Flow Meters assembly
Section 2: Product overview Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
2.2.1 Daniel Mark III Ultrasonic Gas Flow Meters assembly
The Mark III electronics assembly consists of an upper explosion-proof housing and a lower
intrinsically-safe base unit assembly (see Figure 2-2).
Upper explosion-proof housing
• a Daniel Mark III Ultrasonic Gas Flow Meter CPU (Central Processing Unit) Board
• a Field Connection Board (for making electrical connections)
• a Daniel Mark III Ultrasonic Gas Flow Meter I.S. (Intrinsically-Safe) Interface Board
(permanently mounted on the CPU Board)
• Option Boards (Series 100 Option Board or Series 100 Plus Option Board).
Figure 2-2 Daniel Ultrasonic Gas Flow Meter Mark III Electronics
Upper Explosion-Proof
Mark III Housing Assembly
Base Unit
Mark III
Electronics
Acquisition
Option
Boards
Board
CPU
Board
Assembly
Field
Termination
Board
I.S.
Interface
Board