Teledyne 7320 - NDIR analyzer - Manual (Page 23)

Infrared Gas Analyzer Installation 2
2-9 Teledyne Analytical Instruments
Once a zero or span command is sent, and acknowledged (contact
closes), release it. If the command is continued until after the zero or span is
complete, the calibration will repeat and the Cal Relay Contact (CRC) will
close again.
For example:
1) Test the CRC. When the CRC is open, Send a zero command
until the CRC closes (The CRC will close quickly.)
2) When the CRC closes, remove the zero command.
3) When CRC opens again, send a span command until the CRC
closes. (The CRC will close quickly.)
4) When the CRC closes, remove the span command.
When CRC opens again, zero and span are done, and the sample is
being analyzed.
Note: The Remote Probe connector provides signals to operate the
zero and span gas valves synchronously. However, if you
have the –C Internal valve option, which includes zero and
span gas inputs, the 7320 automatically regulates the zero,
span and sample gas flow.
2.3.3.4 Range ID Relays
Four dedicated Range ID relay contacts. For any single application they
are assigned to relays in ascending order. For example: if all ranges have the
same application, then the lowest range is assigned to the Range 1 ID relay,
and the highest range is assigned to the Range 3 ID relay. Range 4 is the Cal
Range ID relay. Figure 2-6 lists the pin connections.
Table 2-6: Range ID Relay Connections
R A N G E 1
ID
C O N TAC T
M o v in g c o n ta c t
N o rm a lly
o p e n