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Table 3-12. J27Radicom Modem Jumper Settings
Pin(s) Position
1 and 2 In
Table 3-13. J30 Radicom Modem Jumper Settings
Pin(s) Position
1 and 2 In
Model 700 Gas Chromatograph System Reference Manual
APRIL 2012 3-9000-521
3 - 55
3.5 Leak checks and purging for
first calibration
Apply AC power to the unit after verifying all electrical connections are 
correct and safe. Ensure that all interconnections and external signal 
connections have been verified and proper grounds have been made 
before turning on the power.
3.5.1 Initial leak check
The focus of this section is for field connections to the analyzer, during 
the installation process. See “Leak checks” on page 4-26 for an in depth 
discussion of analyzer leak checks.
3.5.1.1 Carrier gas line leak checks
1. Plug the Measure Vent (labeled “MV”) to block the free flow of 
Carrier Gas through the GC.
Note
The GC does not have an inline Block Valve to shut off the Carrier Gas flow. 
2. Slowly pressurize the “GC side” of the Carrier Gas to 110 psig (±2 
percent) with the dual-stage regulator at the Carrier Gas cylinder.
Table 3-14. J31 Radicom Modem Jumper Settings
Pin(s) Position
2 and 3 In
System Reference Manual Model 700 Gas Chromatograph
3-9000-521 APRIL 2012
3 - 56
3. After two minutes, shut off the Carrier Gas bottle valve by turning 
it clockwise. Then, observe the high-side regulator gauge on the 
Carrier Gas bottle.
? The gauge should not bleed down more than 200 psig in 10 
minutes.
? If Carrier Gas is lost at a faster rate, then all tube fittings 
between the Carrier Gas bottle and the GC (including the 
dual-stage regulator) must be checked for leaks and 
tightened if necessary. 
Most leaks at this stage (Installation and Setup) are usually 
found between the Carrier Gas bottle and the GC.
The dual-stage regulator fitting connecting to the Carrier 
bottle, may not seat properly with some Carrier Gas bottles 
and allow a leak. If this occurs, carefully wrap a small length of 
Teflon tape around the tip of the inlet tube on the dual-stage 
regulator (which sits against the Carrier Gas bottle valve seat).
4. Once the GC passes the “Initial leak check”, reopen the Carrier 
Gas bottle valve and remove the Measurement Vent (MV) plug.
3.5.1.2 Calibration line leak check
1. Slowly pressurize the Calibration line (up to 20 psig).
2. Block-in the line by turning the “Cal Stream” blocking valve 
clockwise until seated.
3. Shut off the Calibration gas at the gas bottle by turning the valve 
clockwise.
4. Observe the high-side of the Calibration gas dual-stage regulator 
making sure the pressure holds. The pressure should not 
decrease for a period of two to three minutes.
5. When the GC passes the “Initial Calibration Gas leak check”, reopen the Calibration gas bottle valve and the in-line “Cal Stream” 
block valve.
Model 700 Gas Chromatograph System Reference Manual
APRIL 2012 3-9000-521
3 - 57
3.5.1.3 Sample lines (streams) leak check