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SEP 2005
2.2.6
Utility Gas Requirements
a.
Carrier Gas: Application dependent, typically zero grade helium, hydrogen or nitrogen
(99.995% pure, with less than 5 ppm water, and less than 0.5 ppm hydrocarbons); pressure
is variable.
b.
Valve Actuation Gas: typically zero grade, 99.995% pure helium at 100 psig. Consumption
is 100cc per analysis cycle. Clean, dry air also may be used for valve actuation. Carrier Gas
and Valve Actuation Gas are normally supplied from a common cylinder, since overall gas
consumption is minimal.
2.3
CONTROLLER
The GC Controller is a microprocessor-based device that provides the GC System with highly
accurate timing, precision calculations, pertinent report generation, and an interface with other
devices. The Controller provides both analog outputs and a direct digital link with output devices
through RS-232C, RS-422, or RS-485 ports. Volatile portions of the program are protected by a
lithium battery backup if power is lost or turned off at the unit.
The GC Controller can be linked directly to a PC by serial connection, by a telecommunication link
that uses Modbus protocol, or ethernet connection. This provides the preferred method for operating
the GC System. Limited control of the GC System is also possible through a built-in keypad and
display, which are optional components of the purged, hazardous environment GC Controller
package. The local alphanumeric keypad and display allow for maintenance and minor adjustments
in a hazardous environment.
SERIOUS PERSONAL INJURY OR DEATH POSSIBLE
Do not operate a PC or printer in a hazardous environment.
Failure to observe all safety precautions could result in serious injury or death.
2-10
MODEL 1000
EQUIPMENT DESCRIPTION
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Troubleshooting
