1.3 System Hardware Overview
1.3.1 Main Board
The main board houses the microprocessor and supporting electronics for controlling the operation
of the Model 1100 Analyzer. The main board receives the sensor input and provides the control
and display functions of the analyzer.
1.3.2 Relay Board
The Relay Board houses relay contacts for all of the Alarm and Control features of the 1100. The
relays are mapped discretely to each alarm to provide electrical outputs for reporting, and process
control use.
1.3.3 Power Supply
The power supply board is designed to take 110/220 VAC, 50/60 Hz mains power input. The
supply is fused directly on the board. An optional 24 VDC power supply is available for
installations where a DC voltage is required to power the Model 1100.
1.3.4 Display Board
The Display board is designed to generate a digital indication of the concentration of oxygen
(Appendix E – range / output chart), and fault codes (section 4.3.1). The display is a 7-segment,
¾" alphanumeric LED.
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