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Theory of Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 252
11.5.10. FRONT PANEL INTERFACE
The most commonly used method for communicating with the GFC 7001E/EM Analyzer is via the instrument’s
front panel which includes a set of three status LED’s, a vacuum florescent display and a keyboard with 8 context
sensitive keys.
Figure 11-17: GFC 7001E/EM Front Panel Layout
11.5.10.1. Analyzer Status LED’s
Three LED’s are used to inform the user of the instrument’s basic operating status. They are listed on Table
11-5 as follows:
Table 11-5: Front Panel Status LED’s
NAME COLOR STATE DEFINITION
SAMPLE Green
Off
On
Blinking
Unit is not operating in sample mode, iDAS is disabled.
Sample Mode active; Front Panel Display being updated, iDAS data being stored.
Unit is operating in sample mode, front panel display being updated, iDAS hold-off
mode is ON, iDAS disabled
CAL Yellow
Off
On
Blinking
Auto Cal disabled
Auto Cal enabled
Unit is in calibration mode
FAULT Red
Off
Blinking
CO warnings exist
Warnings exist
11.5.10.2. Keyboard
A row of eight keys just below the vacuum florescent display (see Figure 11-15) is the main method by which the
user interacts with the analyzer. As the software is operated, labels appear on the bottom row of the display
directly above each active key, defining the function of that key as it is relevant for the operation being
performed. Pressing a key causes the associated instruction to be performed by the analyzer.
Note that the keys do not auto-repeat. In circumstances where the same key must be activated for two
consecutive operations, it must be released and re-pressed.