General............................................................................................................... 25
Environmental Considerations .......................................................................... 25
Sensor ................................................................................................................ 26
Piping Considerations and Port Connections ................................................................. 27
General............................................................................................................... 27
Sensor Fittings ................................................................................................... 27
Chapter Three: Overview ........................................................................................................... 29
Sensor ............................................................................................................................. 29
Signal Conditioner.......................................................................................................... 29
Instrument Components and Dimensions....................................................................... 29
Interface Connector ........................................................................................................ 33
Pressure Output............................................................................................................... 34
Overpressure Considerations.......................................................................................... 34
Labels.............................................................................................................................. 34
Wiring Diagram Label....................................................................................... 34
“Caution Hot” Label.......................................................................................... 34
Serial Number Label.......................................................................................... 35
Chapter Four: Operation............................................................................................................. 37
How To Zero the Type 631 Transducer ......................................................................... 37
How To Adjust the Zero Potentiometer ............................................................ 38
How To Adjust the Coarse Zero Switch............................................................ 39
Heater Status LEDs and Heater Alarm Relay................................................................. 40
Over-Temperature Protection............................................................................ 40
Chapter Five: Optional Relay System ........................................................................................ 43
General Information........................................................................................................ 43
Trip Point Parameters ..................................................................................................... 43
Trip Point Values............................................................................................... 43
Trip Point Direction........................................................................................... 44
Chapter Six: Maintenance and Troubleshooting ........................................................................ 47
General Maintenance...................................................................................................... 47
Troubleshooting.............................................................................................................. 48