Gas Connections - Teledyne 2000A-EU Operating Instructions Manual

Thermal Conductivity Analyzer
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Each status output is followed by a carriage return and line feed.
Input: The input functions using RS-232 that have been imple-
mented to date are described in Table 3-7.
Command
as<enter>
az<enter>
rp<enter>
st<enter>
Implementation: The RS-232 protocol allows some flexibility in its
implementation. Table 3-8 lists certain RS-232 values that are required by
the Model 2000A implementation.
3.4
The gas fittings are accessed through holes on the underside of the
analyzer chassis, as shown in Figure 3-8. Use
fittings to convert pipe to tube for these connectors.
There are no gas control valves inside the main chassis. A sample
system must be provided for introduction of zero and span gas, as well as
sample gas, into the sample path, and for controlling the flowrates through
the sample and reference paths of the analyzer.
The range in use (00 = Range 1, 01 = Range 2, 10 = Range 3,
11 = Range 4)
The span of the range (0-100 %, etc)
Which alarms—if any—are disabled (AL–x DISABLED)
Which alarms—if any—are tripped (AL–x ON).
Table 3-7: Commands via RS-232 Input
Description
Immediately starts an autospan.
Immediately starts an autozero.
Allows reprogramming of two System functions:
(gas use) and
Toggling input. Stops/Starts any status message output
from the RS-232, until st<enter> is sent again.
Table 3-8: Required RS-232 Options
Parameter
Baud
Byte
Parity
Stop Bits
Message Interval

Gas Connections

Teledyne Analytical Instruments
(linearization).
Setting
2400
8 bits
none
1
2 seconds
1
/ NPT threaded conversion
8
Installation 3
3-11