Table 3-4: Range Id Relay Connections - Teledyne 2120XL Operating Instructions Manual

Installation
When the contact is CLOSED, the analyzer is already calibrating. It
will ignore your request to calibrate, and it will not remember that
request.
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 quickly close.)
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 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 Auto Caibration
Option, it includes additional zero and span gas inputs—
the 2120XL 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 Cal Range. Table 3-4 lists the pin connections.

Table 3-4: Range ID Relay Connections

Pin
21
38
22
39
19
Teledyne Analytical Instruments
Function
Range 1 ID Contact
Range 1 ID Contact
Range 2 ID Contact
Range 2 ID Contact
Range 3 ID Contact
Model 2120XL
24