What is Supervision?

In an unsupervised circuit, a cut wire on a sensor wired normally open or shorted wiring on a sensor wired normally closed will not be detected as alarm triggers. Supervision enables the BP41 to detect these events and trigger a notification or alarm.

There are two types of supervision supported by the BP41:

· Single EOL (one resistor)

· Double EOL (two resistors)

These two types of supervision can be applied to sensors wired Normally Open (NO) or Normally Closed (NC). Reference resistance values are shown below.

Single EOLR Supervision (1000Ω resistors):

Resistance

Normally Closed (NC)

Normally Open (NO)

0 Ω

Shorted Circuit – Trouble Condition

Shorted Circuit or closed event – Alarm Activated

1000Ω

Normal State

Normal State

Infinite Ω

Cut wire or open event – Alarm Activated

Cut wire – Trouble Condition

Double EOLR Supervision:

Resistance

Normally Closed (NC)

Normally Open (NO)

0 Ω

Shorted Circuit – Trouble Condition

Shorted Circuit – Trouble Condition

1000Ω

Normal State

Closed event – Alarm Activated

2000Ω

Open event – Alarm Activated

Normal State

Infinite Ω

Cut wire – Trouble Condition

Cut wire – Trouble Condition

Wiring EOL Resistors to your BP41

In both circumstances the resistors are installed at the end of the circuit as close to the device as possible – this is because installing EOL resistors at the panel will inhibit the purpose of supervision.

Single EOL Resistor

Normally Closed:

Normally Open:

Double EOL Resistor

Normally Closed:

Normally Open:

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