
Table of Contents
iv
Chapter Three: Overview ........................................................................................................... 23
Rear Panel Connections and Controls ............................................................................ 23
Pressure Sensor Connector................................................................................ 23
Decimal Point Selector...................................................................................... 23
Power Interface Connector................................................................................ 24
Interface Connector (J118)................................................................................ 24
BCD Output Connector ..................................................................................... 24
Set point Channel Select Switches .................................................................... 24
Front Panel Controls and Indicators............................................................................... 25
Power Switch..................................................................................................... 25
Display (DVM).................................................................................................. 25
Zero Adjust Control........................................................................................... 25
Set Point Adjust Controls .................................................................................. 25
Read Set Point Switch ....................................................................................... 25
Set Point Relay Indicator Lamps....................................................................... 25
Engineering Units Selection Switch.................................................................. 25
x10
-3
Lamp ......................................................................................................... 25
Channel Select/Remote/Auto Switch ................................................................ 26
Interface Connector (J118) Pinout ................................................................................. 27
Pressure Sensor Terminal Block Connections ............................................................... 28
Chapter Four: Theory of Operation............................................................................................ 29
Pressure Signal ............................................................................................................... 29
Set Points ........................................................................................................................ 29
Overrange Comparator ................................................................................................... 29
Power Supply.................................................................................................................. 29
Pressure Level Comparators........................................................................................... 30
Channel Selector / Function Switch ............................................................................... 30
Chapter Five: Maintenance ........................................................................................................ 31
General Information ....................................................................................................... 31
Fault Isolation................................................................................................................. 31
Power Supply .................................................................................................... 32
Pressure Signal Amplification and Readout ..................................................... 32
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