Valve Control
Valve control
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Valve control
Valves can be controlled manually from the keyboard or as part of a clock or
run time program. Note that if a valve position is changed during a run, it is not
reset automatically at the end of the run unless it is configured as a gas sampling
valve. For other valve types, you must include any desired resets in the program.
The valve drivers
A valve driver is the software and circuitry in the GC that controls a valve or
related function. There are eight drivers known as Valve 1 through Valve 8.
Table 22 Valve Driver Characteristics
The internal valve drivers
Valve drivers 1 through 4 are usually used to control pneumatically operated
valves mounted in the valve box. The wiring for these appears at a set of
connectors inside the right cover of the GC.
Pneumatically driven valves are controlled by solenoids mounted near the
connectors that control the flow of air to the valve actuators.
Valve number Type Volts Power or current Use
1, 2, 3, and 4 Current
source
24 VDC 13 watts Pneumatic valve
control
5 and 6 Current
source
24 VDC 10 0 mA Relays and low-power
devices
7 and 8 Contact
closure
48 VDC or
48 VAC RMS
Control an external
current source
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