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1.6 Electrical and pneumatic connections
1.6.1 Electrical connections
Output #1 Carbon Monoxide concentration - Chart Recorder (REC)
Output #2 Carbon Monoxide concentration - Data Acquisition System (DAS)
Output #3 Test function analog output
Input #4 Zero valve request
Input #5 Span valve request
Input #6 Not Used
There are 2 six-pin connector strips on the rear panel shown in Figure 1.2. The pins
are divided into 3-plus/minus pairs and have the functions shown above.
Outputs 1 and 2 have identical signals and electrical characteristics. Output 3 is the same
as 1 and 2 electrically, but has analog TEST function signals routed to it. See
Diagnostics in Section 5 for details.
1.6.2 Remote contact closures zero/span inputs and status
outputs
Remote contact closures can be used to remotely energize the zero/span valves to do a
zero or span check. The external contact closure should be capable of switching 12 VDC
at 50 ma.
Refer to Figure 1.2 for connection location. See Sections 1.8.6 and 3.6 for further details.
NOTE
ZERO OR SPAN CHECKS CAN BE PERFORMED IN ANY
ORDER.
1.6.3 Status Outputs
Status outputs report analyzer conditions via contact closures located on the DB-50
connector on the rear panel. The contacts are NPN transistors which can pass 50 mA of
DC current. The pin assignments are listed in Table 1.1 below:
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 10