Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 19)

Introduction Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 1
1. INTRODUCTION
The Models GFC 7000TA and GFC 7000TM differ only in specifications; unless clearly differentiated,
both models in this manual are referred to as the GFC 7000TA for simplification. The GFC 7000TA
measures carbon dioxide CO
2
by comparing infrared energy absorbed by a sample to that absorbed by a
reference according to the Beer-Lambert law. This is accomplished by using a Gas Filter Wheel which
alternately allows a high energy infrared light source to pass through a CO
2
filled chamber and a chamber
with no CO
2
present.
The light then travels through the sample cell, which has a folded path. The energy loss through the
sample cell is compared with the zero reference signal provided by the gas filter to produce an output
proportional to concentration, with little effect from interfering gases within the sample. A nitrogen purge
system is provided for the GFC wheel assembly to eliminate the effects of ambient CO
2
, if necessary.
This design produces superior zero and span stability and a high signal-to-noise ratio, allowing excellent
sensitivity. Multi-tasking software gives real time indication of numerous operating parameters and
provides automatic alarms if diagnostic limits are exceeded
1.1. Features
 Ranges,
GFC 7000TA : 0-2 ppm to 0-2000 ppm, GFC 7000TM: 0-4 ppm to 0-4000 ppm, user
selectable
 Gas Filter Wheel for CO
2
specific measurement
 LCD Graphical User Interface with capacitive touch screen
 Multi-tasking software allows viewing of test variables during operation
 Continuous self checking with alarms
 Bi-directional RS-232 and 10/100Base-T Ethernet (optional USB and RS-485) ports for remote
operation
 Front panel USB ports for peripheral devices
 Digital status outputs to indicate instrument operating condition
 Adaptive signal filtering to optimize response time
 Temperature & Pressure compensation
 Internal data logging with 1 min to 24 hour averages
1.2. Using This Manual
This manual has the following data structures:
1 TABLE OF CONTENTS:
Outlines the contents of the manual in the order the information is presented. This is a good overview of
the topics covered in the manual. There is also a list of tables, a list of figures and a list of appendices.
2 SPECIFICATIONS
This section contains a list of the analyzer’s performance specifications.