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0 (zero) psig.
8. Repeat Steps 4 through 7, five times.
9. Open the calibration gas bottle valve.
3.6 System startup
To perform system start-up,
1. For system startup, run an analysis of the calibration gas.
If equipped with an optional stream switching board, ensure that 
the stream switch for the calibration stream is set to AUTO.
Otherwise, ensure that the calibration gas supply is turned on and 
set to the correct pressure (25 to 30 PSIG).
Using the MON2000 software, run a single stream analysis on the 
calibration stream. Once proper operation of the GC is verified, 
halt the analysis. 
Use the Control > Calibration and Control > Halt menu 
paths; see Sections 4.3 and 4.4 in the MON2000 Software for Gas 
Chromatographs User Manual (P/N 3-9000-522) for more 
information.
2. Start Auto Sequence of the line gas stream(s).
Use the Control > Auto Sequence menu path; see Section 4.1 in 
the MON2000 Software for Gas Chromatographs User Manual (P/N 
3-9000-522) for more information. The GC will begin the Auto 
Sequence analysis mode.
System Reference Manual Model 700 Gas Chromatograph
3-9000-521 APRIL 2012
3 - 60
This page is intentionally left blank.
4 - 1
4--Section 4: Maintenance and troubleshooting
4.1 Hazardous environments
WARNING
Observe all precautionary signs posted on the Model 700 enclosure. Failure to do so 
may result in injury or death to personnel or cause damage to the equipment.
WARNING
ATEX certified units must be installed strictly in compliance with the requirements of 
IEC 60079-14.
Special conditions for safe use must be met. The maximum constructional gap (ic) is 
less than that required by Table 2 of EN 60079-1:2007.
Before opening the Model 700 enclosure, reduce the risk of igniting hazardous 
atmospheres by disconnecting the equipment from all power supplies. Keep the 
assembly closed tightly when in operation to reduce the risk of igniting hazardous 
atmospheres. Inlet (incoming) wiring must meet local standards (i.e. in conduit with 
seal fitting within 18 or via cable glands certified to IEC 60079-1). Upper enclosure 
threaded entry is ? NPT. Lower enclosure threaded entries are M32-1.5.
Observe all precautionary signs posted on the Model 700 enclosure. Failure to do so 
may result in injury or death to personnel or cause damage to the equipment.
Please direct all health, safety and certification related questions to: Emerson Process 
Management, Gas Chromatographs, Applications Engineering Group, 713-827-6380 or 
1-866-GC Center (1-866-422-3683).
System Reference Manual Model 700 Gas Chromatograph
3-9000-521 APRIL 2012
4 - 2
4.2 Troubleshooting and repair concept
The most efficient method for maintaining and repairing the Model 700 
GC system is a component-replacement concept that allows you to 
return the system to operation as quickly as possible. Sources of trouble, 
such as printed-circuit assemblies, valves, etc., are identified during 
troubleshooting test procedures and are replaced at the lowest level 
practical with units in known working order. The defective components 
are then either repaired in the field or returned to Measurement Services 
for repair or replacement.
4.3 Routine maintenance
The Model 700 GC system will perform accurately for long periods with 
very little attention (except for maintaining the Carrier Gas cylinders). A 
bimonthly record of certain parameters will assist greatly in assuring that 
your Model 700 is operating to specifications. The maintenance checklist 
should be filled out bimonthly, dated, and kept on file for access by