• Use ⅛-in. stainless steel tubing to connect calibration standard gas unless the
application requires treated tubing.
• Use a dual-stage regulator with low-side capacity of up to 30 psig (206.8 kPa).
4. Connect sample gas stream(s) to the GC.
• Use ⅛-in. stainless steel tubing, as appropriate, to connect sample gas.
• Unless stated otherwise in the product documentation, ensure that the pressure
of the calibration and sample line is regulated at 15 psig to 20 psig (103.4 to
137.9 kPa).
Postrequisites
After all lines have been installed, proceed with leak-checking the carrier and sample lines.
See Leak checking and purging for first calibration.
2.4.4
Maximum effective distance by communication
protocol type
The table below lists the maximum distance at which the indicated protocol can transmit
data without losing effectiveness. If longer runs are required, the use of a repeater or other
type of extender will be necessary to maintain the protocol's efficiency.
Communication protocol
Maximum distance
RS-232 50 ft. (15.24 m)
RS-422/RS-485 4,000 ft. (1,219.2 m)
Ethernet (CAT5) 300 ft. (91.44 m)
2.4.5 RS-485 serial port terminating resistors
To ensure correct communication with all hosts, place a 120-ohm terminating resistor
across the GC serial port terminals on the RS-485 link. On a multi-dropped link, install the
terminating resistor on the last controller link only.
2.4.6
Connect directly to a personal computer (PC) using the
gas chromatograph's (GC’s) Ethernet1 port
Procedure
1. Plug one end of the Ethernet cable into the PC’s Ethernet port and the other end
into the GC’s RJ45 socket on on the backplane.
2. Locate switch at SW1 on the backplane. Place SW1 in the On position.
Note
The GC can be connected (or remain connected) to the local network on Ethernet2
on the backplane while the DHCP feature on Ethernet1 is being used.
Quick Start Guide Installation and start-up
00825-0100-3770 July 2020
Rosemount 700XA 27
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