Teledyne 4020 - Hydrocarbon analyzer - Manual (Page 39)

Total Hydrocarbon Analyzer Installation
Teledyne Analytical Instruments 23
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.
3.3.3.7 R ANGE ID R ELAYS
There are three dedicated Range ID relay contacts. They 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. 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 Not Used
35 Not Used
3.3.3.8 N ETWORK 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 in future options
to the instrument. Pins 13 (+) and 29 (–).
3.3.3.9 P IN O UT T ABLE
The following table summarizes all the outputs/inputs available in
the 50 pin D-Sub connector on the backpanel of the analyzer.