The External Valve Drivers - Agilent Technologies 7890 Series Advanced Operation Manual

6
Valves

The external valve drivers

218
Keyboard
or
Run table
or
Clock table
There is no direct relationship between the location of a
valve in the valve box and the driver that controls it. This
depends on how the solenoids are wired and the actuators
are plumbed.
Manual valves must be switch by hand, and are heated or
unheated.
Valve drivers 5 and 6 control a current that may be used to
drive a relay or other low- power device. Valve drivers 7 and
8 switch a current from an external source. Electrical details
are in Table 55 on page 217.
These drivers, particularly Valve 7 and 8, may be used to
control a motor driven multiposition valve for stream
selection.
All four of these drivers appear on the External Event
connector on the back of the GC.
Keyboard
or
Run table
or
Clock table
Internal valve drivers
(1 through 4)
External valve drivers
(5 through 8)
Advanced Operation Manual
Connector V1
Connector V2
Connector V3
Connector V4
Valve 5 (pin 1) and
ground (pin 3 or 4)
Valve 6 (pin 2) and
ground (pin 3 or 4)
Valve 7 (pin 5
and pin 6)
Valve 8 (pin 7
and pin 8)