Emerson FB1200 - Central Processing Unit (CPU); Explosion-proof Enclosure

Emerson FB1200 Flow Computer Instruction Manual
D301782X012
March 2019
Introduction 5
1.3.1 FB1200 Flow Computer (without Integral Sensor)
The no integral sensor version includes no sensor module. In this case the process variable data
used in flow computer calculations comes from external devices and enters the device through the
serial ports or I/O channels.
Figure 1-3: FB1200 Flow Computer (No Integral Sensor Version)
1.4 Central Processing Unit (CPU)
The flow computer’s CPU is a NXP
®
Kinetis
®
K61 series CPU with an ARM
®
Cortex
®
M4 processor
that operates at 4 MHz to 60 MHz depending on the power mode. The CPU runs the Micrium
operating system.
1.4.1 Memory
The flow computer includes both static and flash memory.
Table 1-1: Memory
Memory
Usage
8 MB SRAM
Holds current states of all variables and historical archives
128 MB FLASH
Holds firmware image and configuration files
1.5 Explosion-proof Enclosure
The FB1200 Flow Computer includes an explosion-proof enclosure made of either aluminum or
stainless steel. The enclosure consists of the main housing, two threaded covers, and four conduit
entry points.
The four conduit entry points are ¾ in NPT pipe threaded holes that permit entry of field conduit
for I/O and communication wiring. ATEX installations use a ¾ in NPT to M20 thread reducer.
Unused apertures shall be closed with suitable blanking elements.