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Trace Oxygen Analyzer Installation
Teledyne Analytical Instruments 23
3. When CRC opens again, send a span command until the
CRC closes. (The CRC will quickly close.)
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 Valve connections (described below) provides
signals to ensure that the zero and span gas valves will be
controlled synchronously. If you have the –C Internal valve
option—which includes additional zero and span gas
inputs—the 3000ZA automatically regulates the zero, span
and sample gas flow.
Range ID Relays: Four dedicated Range ID relay contacts. The first
three ranges are assigned to relays in ascending order—Low range is
assigned to Range 1 ID, Medium range is assigned to Range 2 ID, and
High range is assigned to Range 3 ID. The fourth range is reserved for
the Air Cal Range (25%). Table 3-4 lists the pin connections.
Table 3-4: 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 Spare Contact
35 Spare Contact
Network I/O: A serial digital input/output for local network protocol.
At this printing, this port is not yet functional. It is to be used for future
options to the instrument. Pins 13 (+) and 29 (–).
Remote Valve Connections: The 3000ZA is a single-chassis
instrument, which has no Remote Valve Unit. Instead, the Remote Valve
connections are used as a method for directly controlling external
sample/zero/span gas valves. See Figure 3-5.