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Remote Operation Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 179
8.6.6. HESSEN PROTOCOL GAS LIST ENTRIES
8.6.6.1. Gas List Entry Format and Definitions
The GFC 7001E/EM Analyzer keeps a list of available gas types. Each entry in this list is of the following format.
[GAS TYPE],[RANGE],[GAS ID],[REPORTED]
WHERE:
GAS TYPE = The type of gas to be reported (e.g. CO, CO
2
, O
2
, etc.).
RANGE = The concentration range for this entry in the gas list. This feature permits the user to
select which concentration range will be used for this gas list entry. The GFC 7001E/EM
Analyzer has two ranges: RANGE1 or LOW & RANGE2 or HIGH (See Section 6.6.1).
0 - The HESSEN protocol to use whatever range is currently active.
1 - The HESSEN protocol will always use RANGE1 for this gas list entry.
2 - The HESSEN protocol will always use RANGE2 for this gas list entry.
3 - Not applicable to the GFC 7001E/EM Analyzer.
GAS ID = An identification number assigned to a specific gas. In the case of the GFC 7001E/EM
Analyzer in its base configuration, there is only one gas CO, and its default GAS ID is
310. (Note: This ID number should not be modified).
REPORT = States whether this list entry is to be reported or not reported when ever this gas type or
instrument is polled by the HESSEN network. If the list entry is not to be reported this
field will be blank.
While the GFC 7001E/EM Analyzer is a single gas instrument that measures CO, it can have additional, optional
sensors for CO
2
or O
2
installed. The default gas list entries for these three gases are:
CO, 0, 310, REPORTED
CO
2
, 0, 311, REPORTED
O
2
, 0, 312, REPORTED
These default settings cause the instrument to report the concentration value of the currently active range. If you
wish to have just concentration value stored for a specific range, this list entry should be edited or additional
entries should be added to the list.
EXAMPLE: Changing the above CO gas list entry to read:
CO, 2, 310, REPORTED
would cause only the last CO reading while RANGE2 (HIGH) range was active to be recorded.