Teledyne 7300A manual Pin Contact, Digital Remote Cal Inputs

Infrared Gas Analyzer Installation 2

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

45Threshold Alarm 1, normally closed contact

28Threshold Alarm 1, moving contact

46Threshold Alarm 1, normally open contact

42Threshold Alarm 2, normally closed contact

44Threshold Alarm 2, moving contact

43Threshold Alarm 2, normally open contact

36System Alarm, normally closed contact

20System Alarm, moving contact

37System Alarm, normally open contact

2.3.3.3Digital 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.)

Teledyne Analytical Instruments 2-7