Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 41)

Total Hydrocarbon Analyzer Installation
Teledyne Analytical Instruments 23
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.
Table 3-7: Pin out of 50 pin D-Sub Connector
pin # Description
1
2
3 + Range ID 4-20 ma
4 - Range ID 4-20 ma
5 + Output 4-20 ma
6 - Output 4-20 ma
7 - Output 0-1 v
8 + Range ID 0-1 v