Teledyne Analytical Instruments
Thermal Conductivity Analyzer
Installation 3
3-9
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 (paragraph 3.3.3.6) provides
signals to operate the zero and span gas valves synchro-
nously. However, if you have the –C Internal valve option,
which includes zero and span gas inputs, the 2000A automati-
cally regulates the zero, span and sample gas flow.
3.3.3.4
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. Table 3-6 lists the pin connections.
Table 3-6: Range ID Relay Connections
Pin
Function
21
Range 1 ID Contact
38
Range 1 ID Contact
22
Range 2 ID Contact
39
Range 2 ID Contact
19
Range 3 ID Contact
18
Range 3 ID Contact
34
Range 4 ID Contact
35
Range 4 ID Contact
3.3.3.5
Network I/O
A serial digital input/output for local network protocol. At this print-
ing, this port is not yet functional. It is to be used in future options to the
instrument. Pins 13 (+) and 29 (–).
3.3.3.6
Remote Valve Connector
The 2000A is a single-chassis instrument, which has no Remote Probe
Unit. Instead, the Remote Valve connector is used as another method for
controlling external sample/zero/span gas valves. See Figure 3-5.