Instruction manual

ControlWave GFC IS Communication Interface Manual (CI-CW-GFC-ISTRAN)
Chapter 1 – Introduction
The ControlWave GFC Intrinsically Safe IStran Communication
Interface (IStran) allows an intrinsically safe ControlWave Gas Flow
Computer / Corrector (CW-GFC-IS) to communicate with a device
located in a Division 2 or non-hazardous area.
Underwriter’s Laboratories (UL) approves the IStran interface with a
CW-GFC-IS unit when you use it with approved intrinsically safe
battery power/solar panel power, or when the CW-GFC-IS receives
external power through the IStran.
The IStran performs the following functions:
 Replaces six intrinsic safety barriers for RS-232 signals (3 in, 3 out)
 Provides 500V isolation between two devices
 Operates at speeds up to 19,200bps
 Allows the CW-GFC-IS to receive power from outside the Division
1 area
 Allows the CW-GFC-IS to control power to a radio or modem
located outside the Division 1 area
You can also use the IStran for certain applications where intrinsic
safety is unnecessary, such as to provide isolation between two devices
or to allow multiple devices to share a single radio or modem.
Figure 1-1. IStran Front View
Issued Nov-09 Introduction 1-1