Teledyne 465L operation manual Hi-Current Relay Outputs, Relay # Function Normal Operating State

Teledyne API Model 465L O3 Monitor Operation Manual

4.2.4.Hi-Current Relay Outputs

Three form C relay outputs are provided on the rear panel on the nine pin connector (See Figure 4-6). The relays are labeled “Relay 1,” “Relay 2,” and “Relay 3.”

The relays are dry contact type form C (SPDT) relays with Normally Open (N.O.), Normally Closed (N.C.) and Common (COM) contacts. The relays are capable of driving loads of up to 250VAC, 5A. For maximum contact life, the relays should only be used to drive resistive loads. Contact life may be dramatically shortened if inductive loads are driven without any provision for minimizing high voltage “inductive kick” that can occur.

These relays have slightly different functions depending on whether the monitor is a single stream or multi-stream configuration.

Table 4-2: Relay Functions for Single Stream Config

Relay #	Function		Normal
			Operating State
1	System OK Diagnostic	On
2	Hi Alarm	Off
3	Hi-Hi Alarm	Off

Table 4-3: Relay Functions for Multi-Stream Configs

Relay # Function

1System OK Diagnostic

2Global Hi Alarm*

3Global Hi-Hi Alarm*

Normal Operating State

On

Off

Off

*The state of the global alarm represents all the Hi or Hi-Hi alarm states OR’d together, i.e. if the Hi alarm for one or more of the sample streams is activated, then the Global Hi alarm will be activated.

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