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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
4.3.3 Contact Closure Control Input Interface
The Zero/Span calibration can be initiated using external control inputs to control optional
Zero/Span valves. There are 4 optoisolator type control inputs available and each input is
assigned by the software for specific calibration control. Refer to Figure 2-2 REMOTE IN PIN
ASSIGNMENTS Table and Figure 4-4 for interfacing with external device. Refer to Section 8.5
for additional information.
Figure 4-4 shows an example of a control input interfacing circuit. The input current through the
LED is limited by a built-in resistor to prevent damage due to over-current. Once the desired
input channels are properly connected, the user can set up each input to perform specific
calibration. The input signal should be a high level (opto closed) with a minimum duration of 1
second.
4-13