Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 157)

CommunicationsTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 157
6.7.3. HESSEN PROTOCOL GAS LIST ENTRIES
6.7.3.1. HESSEN PROTOCOL GAS ID
The GFC7001T/GFC7001TM Analyzer keeps a list of available gas types. Each entry
in this list takes 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
GFC7001T/GFC7001TM Analyzer has two ranges: RANGE1
or LOW & RANGE2 or HIGH (See Section 5.4.1).
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 GFC7001T/GFC7001TM Analyzer.
GAS ID = An identification number assigned to a specific gas. In the
case of the GFC7001T/GFC7001TM Analyzer in its base
configuration, there is only one gas CO, and its default GAS ID
is 310. 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 GFC7001T/GFC7001TM 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.