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Teledyne API Model 465L O3 Monitor Operation Manual
05509G DCN6806
Teledyne API Model 465L O
3
Monitor Manual
29
4.4.4.
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
Normal
Operating State
1
System OK Diagnostic
On
2
Global Hi Alarm*
Off
3
Global Hi-Hi Alarm*
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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