Panametrics CGA 351, User Manual, Page: 106 / 119

Appendix C.
100 CGA 351 User’s Manual
C.1.2b Connecting the Sample System
For the best results, the sample system should be mounted as close to the CGA 351 analyzer as possible. See Figure 7
below for the location of the Swagelok fittings on the rear panel, and complete the following steps:
1. Using 1/8” stainless steel tubing, connect the gas source from the sample system to the Input Gas fitting on the
rear panel.
2. Using 1/8” stainless steel tubing, connect the Sample Output fitting on the rear panel to the gas discharge con -
nection on the Sample System.
Note:
If desired, a suitable sample system may be ordered directly from the factory. The sample system would be
supplied fully assembled on a flat plate with four (4) mounting holes.
Figure 7: CGA 351 Rack Mount Version - Rear Panel
C.1.2c Wiring the Rack Mount
The rack mount CGA 351 requires the same electrical connections as the standard version, but the wiring to PC Board
terminal strips TB1, TB2 and TB3 has already been done at the factory. The only remaining connections to be made
are at the rear panel terminal strip for those outputs being used (see Figure 7 above and Figure 9 on page 102).
Connecting The Outputs
The terminal block on the rear panel provides connections for the CGA 351’s output signals. The following signals are
available:
• serial port
• 0/4–20 mA, 0–2 V, or Namur analog output
• alarm relays
All of the connections on this terminal block are optional, in that they are not required for proper operation of the
analyzer. To wire any or all of these output signals, complete the following steps which apply:
1. Connect a serial port from a personal computer to the COMM pins as follows:
a.
Connect the
transmit wire to pin 1.
b.
Connect the receive wire to pin 2.
c.
Connect the
ground/return wire to pin C.
2. Connect an analog output device to the 4-20mA pins as follows:
a.
Connect the
input wire to the external device to pin +.
b.
Connect the output wire from the external device to pin –.
3. Connect alarm device(s) to the
ALARM 1 and/or ALARM 2 pins as follows:
a.
Connect the input wire to the alarm-1 device to pin NO.
b.
Connect the
output wire from the alarm-1 device to pin C.
Fan
Gas
Fittings
Output
Connections
Conn .
Switch
Power