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Oxygen Analyzer
When CRC opens again, zero and span are done, and the sample is
being analyzed.
Note: The Remote Probe connector (paragraph 3.3) provides signals
to the Analysis Unit to ensure that the zero and span gas
valves will be controlled synchronously.
Range ID Relays: Four dedicated Range ID relay contacts. The first
three ranges are assigned to relays in ascending order—Low range is as-
signed to Range 1 ID, Medium range is assigned to Range 2 ID, and High
range is assigned to Range 3 ID. The fourth range is reserved for the Air Cal
Range (25%).
Network I/O: A serial digital input/output for local network protocol.
At this printing, this port is not yet functional. It is to be used in future
versions of the instrument.
RS-232 Port: The digital signal output is a standard RS-232 serial
communications port used to connect the analyzer to a computer, terminal, or
other digital device. It requires a standard 9-pin D connector.
The data is status information, in digital form, updated every two
seconds. Status is reported in the following order:
•
•
•
•
•
Each status output is followed by a carriage return and line feed.
Three input functions using RS-232 have been implemented to date.
They are described in Table 3-1.
Command
as<enter>
az<enter>
st<enter>
The concentration in ppm or percent
The range in use (HI, MED, LO)
The span of the range (0-100 ppm, etc.)
Which alarms—if any—are disabled (AL–x DISABLED)
Which alarms—if any—are tripped (AL–x ON).
Table 3-1: Commands via RS-232 Input
Description
Immediately starts an autospan.
Immediately starts an autozero.
Toggling input. Stops/Starts any status message output from
the RS-232, until st<enter> is sent again.
Part I: Control Unit
Part I: 3-7
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