Specifications

Supplement – CW-GFC-IS
Issued Nov-09 Supplement to CI-ControlWave GFC / CI-ControlWave Corrector 1
Chapter 1 – Introduction
This supplement describes the differences in installation and setup
between the intrinsically safe (IS) versions of the ControlWave Gas
Flow Computer (GFC) / ControlWave Corrector and the standard
versions of these devices.
Overview
The intrinsically safe features of the ControlWave GFC-IS /
ControlWave Corrector-IS are designed to prevent sparks or release of
energy that could ignite a hazardous atmosphere and cause an explosion.
Differences between the Standard and IS Versions
There are several differences between the ControlWave GFC /
ControlWave Corrector and the ControlWave GFC-IS / ControlWave
Corrector-IS:
 Unlike the standard GFC/Corrector, the GFC-IS/Corrector-IS
operates in Class I Division 1 hazardous locations.
 To ensure the integrity of the intrinsically-safe rating, the CPU and
I/O boards are located behind a shield in the enclosure and all wiring
termination blocks are on a termination panel. When replacing the
battery, replace the shield to preserve the intrinsic safety integrity.
 The internal lead acid battery is a special sealed type with internal
protection (part number 396924-01-8).
 The GFC-IS/Corrector-IS does not support an internal case-mounted
radio or modem.
 The only supported communication methods for the GFC-
IS/Corrector-IS are serial RS-232 communication through COM1
and COM2, and serial RS-485 communication through COM3. The
RS-485 interface can be connected to a 3808 transmitter for an
additional meter run.
 Communication to devices outside the hazardous area requires the
ISTRAN (Intrinsically Safe Communication Interface unit). See CI-
CW-GFC-ISTRAN for more information.
 The only GFC-IS/Corrector-IS CPU speed is 14 MHz.
 The GFC-IS/Corrector-IS power supply only operates from +5.4V to
8V (+6V nominal input power).
 DO NOT USE alternate power input connector (P6).
 The GFC-IS/Corrector-IS has no auxiliary power output.
 The GFC-IS/Corrector-IS does not support a polyphaser.
 The GFC-IS/Corrector-IS does not have an analog output (AO)
option.
 Digital outputs have a V
max
of 10Vdc and an I
max
of 250 mA.
 Analog inputs support 1-5V operation only. They do not support 4-
20 mA operation.