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2 Operational Theory2 Operational Theory
2 Operational Theory2 Operational Theory
2 Operational Theory
TELEDYNE ANALYTICAL INSTRUMENTS
The digital printed circuit board (PCB) is a general purpose microcomputer used
to control all functions of the analyzer. The analog input PCB and the analog output
PCB plug directly into connectors located on the digital PCB. In addition to control-
ling these analog PCBs, the digital board performs the following functions:
1. Processes input from the control panel pushbuttons.
2. Provides signals for the selectable alarms.
3. Processes serial I/O functions (RS-232 data). The serial interface default
and programmable parameters are listed in Table 2-2.
Table 2-2. Default and Programmable Parameters
Defaults Programmable Options
1200 Baud 1200 Baud
8 Bits 5, 6, 7, or 8 Bits
No Parity Even, Odd, or No Parity
1 Stop Bit 1 or 2 Stop Bits
4. Controls the LCD and the LED displays.
LCD: This screen is a dot-matrix display located on the control module of
the analyzer. It is the user interface for system operations. It
displays the menus and command options available for each
function.
LED: This screen is a 7-segment display located on the front panel of the
analyzer, above the control module. It displays only the oxygen
concentration. It is large and bright to allow the operator to read it
at a greater distance. A dimmer switch for this display is located on
the display PCB behind the front panel.
The analyzer power supply module is a replaceable assembly containing four
power supplies and five alarm relays. Electronic circuitry used to drive and interface
the alarm relays to the output of the microcomputer is also located inside this module.
Note: This power supply contains an International Power Entry Module. This
feature allows operation on any of four international voltage ranges:
100V, 120V, 220V or 240V (50Hz or 60Hz). It also facilitates both North
American and European fusing arrangements. Programming this mod-
ule is described in the installation section of this manual.