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FAQ 
 Model GFC7000TA Carbon Dioxide Analyzer 
 
 
Teledyne Analytical Instruments 
46 
Q: 
Where is the sintered filter/sample flow control orifice? 
 
A: 
These components are located inside the flow control assembly that is attached to the inlet side of 
the sample pump, see Figure 3-3.  See Section 11.6.1 for instructions on disassembly and 
replacement. 
Q: 
How do I set up a SEQUENCE to run a nightly calibration check? 
 
A: 
The setup of this option is located in Section 7.6. 
Q: 
How do I set the analog output signal range and offset? 
 
A: 
Instructions for this can be found in Section 6.13.4 which describes analog I/O configuration. 
Q: 
What is the averaging time for an GFC 7000TA? 
 
A: 
The default averaging time, optimized for ambient pollution monitoring, is 150 seconds for stable 
concentrations and 10 seconds for rapidly changing concentrations; See Section10.5.1 for more 
information.  However, it is adjustable over a range of 0.5 second to 200 seconds (please contact 
customer service for more information). 
 
4.2. Glossary 
Note: Some terms in this glossary may not occur elsewhere in this manual. 
Term Description/Definition 
10BaseT 
an Ethernet standard that uses twisted (“T”) pairs of copper wires to transmit at 
10 megabits per second (Mbps) 
100BaseT 
same as 10BaseT except ten times faster (100 Mbps) 
APICOM 
name of a remote control program offered by Teledyne to its customers 
ASSY 
Assembly
 
CAS 
Code-Activated Switch 
CD 
Corona Discharge
, a frequently luminous discharge, at the surface of a 
conductor or between two conductors of the same transmission line, 
accompanied by ionization of the surrounding atmosphere and often by a power 
loss 
CE 
Converter Efficiency
, the percentage of light energy that is actually converted 
into electricity 
CEM 
Continuous Emission Monitoring 
Chemical formulas that may be included in this document: 
CO
carbon dioxide 
C
3
H
8
 propane 
CH
4
 methane 
 
H
2
O water 
vapor 
HC 
general abbreviation for hydrocarbon