3-14 | Model 931S / Model 932S UV Analyzers
Input/Output Signal Connections
The analyzer can be configured with up to four (4) current output signals.
The following inputs/outputs are supplied with the analyzer as standard:
• One digital input for remote calibration.
• One digital input for Alarm Enable/Disable Concentration Alarms
(must be terminated with a jumper or closed contact for the alarms to
be enabled).
• Four (4) non-isolated voltage outputs.
If connecting one or more of the analyzer non-isolated voltage outputs
to an external device, a 15 Volt Zener Diode must be connected across
the positive and common terminals of each non-isolated voltage out-
put channel at J108 of the Customer I/O board (Part No. 100-1758).
• One isolated current output.
• Minimum 250 Ohm impedance in series of the analog loop (up to a
maximum 1000 Ohm load).
The analog input/output (and alarm relay) terminations are made on the
Customer I/O board (Figure 3-4) in the Lower Enclosure.
Figure 3-4 is an example of a European style Customer Connections
drawing. For your system, refer to Final “As-Built” drawings in the
analyzer Documentation Package.
European Installations only:
Signal wires, contained within cable that is approved locally for the haz-
ardous area, enter the Ex d Lower Enclosure through one of the Signal
Cable Entries on the bottom of the enclosure.
NOTE
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