Teledyne 7300a - NDIR analyzer - Manual (Page 19)

Infrared Gas Analyzer Installation 2
2-7 Teledyne Analytical Instruments
System Alarm: Actuates when DC power supplied to circuits is
unacceptable in one or more parameters. Permanently
configured as failsafe and latching. Cannot be de-
feated. Actuates if self test fails.
(Reset by pressing button to remove power. Then
press again and any other button EXCEPT
System to resume.
Further detail can be found in chapter 4, section 4-5.
Table 2-5: Alarm Relay Contact Pins
Pin Contact
45 Threshold Alarm 1, normally closed contact
28 Threshold Alarm 1, moving contact
46 Threshold Alarm 1, normally open contact
42 Threshold Alarm 2, normally closed contact
44 Threshold Alarm 2, moving contact
43 Threshold Alarm 2, normally open contact
36 System Alarm, normally closed contact
20 System Alarm, moving contact
37 System Alarm, normally open contact
2.3.3.3 Digital Remote Cal Inputs
Accept 0 V (off) or 24 V dc (on) inputs for remote control of calibra-
tion. (See Remote Calibration Protocol below.) See Table 2-5 for pin
connections.
Zero: Floating input. A 5 to 24 V pulse input across the + and –
pins puts the analyzer into the
Zero mode. Either side may be
grounded at the source of the signal. A synchronous signal
must open and close the gas control valves appropriately.
Span: Floating input. A 5 to 24 V pulse input across the + and –
pins puts the analyzer into the Span mode. Either side may
be grounded at the source of the signal. A synchronous signal
must open and close the gas control valves appropriately.
Cal Contact: This relay contact is closed while analyzer is spanning
and/or zeroing. (See Remote Calibration Protocol below.)