Teledyne GFC-7001E - Trace CO Analyzer - Manual (Page 86)

Basic Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 86
6.2. SAMPLE MODE
This is the analyzer’s standard operating mode. In this mode the instrument is analyzing the gas in the sample
chamber, calculating CO concentration and reporting this information to the user via the front panel display, the
analog outputs and, if set up properly, the RS-232/RS-485/Ethernet ports.
NOTE
A value of “XXXX” displayed in the CO Concentration field means that the M/R ratio is invalid because
CO REF is either too high (> 4950 mVDC) or too low (< 1250 VDC).
A value of “XXXX” displayed for any of the TEST functions indicates an out-of-range reading or the
analyzer’s inability to calculate it.
A variety of TEST functions are available for viewing at the front panel whenever the analyzer is at the MAIN
MENU. These functions provide information about the various functional parameters related to the analyzers
operation and its measurement of gas concentrations. This information is particularly a performance problem
during troubleshooting (see Section 13.1.2).
To view these TEST functions, press,
Figure 6-2: Viewing GFC 7001E/EM Test Functions
NOTE
All pressure measurements are represented in terms of absolute pressure. Absolute, atmospheric
pressure is 29.92 in-Hg-A at sea level. It decreases about 1 in-Hg per 300 m gain in altitude. A variety of
factors such as air conditioning and passing storms can cause changes in the absolute atmospheric
pressure.