Agilent Technologies 1200 Series Reference Manual page 216

7 Introduction to the Quaternary Pump
Fan Drive
The fan speed is controlled by the main processor depending on the internal
heat distribution in the quaternary pump. The fan provides a PWM signal
which is proportional to its speed. This fan status signal is used for
diagnostics.
Electronic Fuses
The valve circuits are electronically fused on the board. Any error on the
board or shortages of the valves will activate the electronic fuses that will
switch off the supply voltage. This prevents the damage to components.
Onboard Battery
An onboard lithium battery buffers the electronic memories when the
quaternary pump is turned off.
For safety information on Lithium batteries see
Information"
Interfaces
The quaternary pump provides the following interfaces:
• two CAN connectors as interface to other Agilent 1200 Series modules
• one GPIB connector as interface to the ChemStation
• one RS-232C for as interface to a computer
• one REMOTE connector as interface to other Agilent products
• one Analog Output for pressure signal output
• one optional interface board
Figure 47
216
on page 245.
control signal
data/ address
diagnose signals (digital)
diagnose signals (analog)
ϑ
temperature of hybrid
Block Diagram Signal Explanations
"Lithium Batteries
1200 Series QP Reference Manual