What is EOLR?
End of line resistors (EOLR) are resistors of a specified value that are used to terminate protective loops or zones. The purpose of EOLR’s is to allow the control panel to supervise the field wiring for open or short circuit conditions.
What is EOLR Roux?
EOLR stands for edge orientation left (and) right. This combines steps 4a and 4b of roux last six edges. The idea behind it is that you solve EO in a specific way in order to put the UL UR edges on the bottom.
What does EOL mean in fire alarm systems?
End-of-Line Resistor
End-of-Line Resistor (or EOL) is a resistor that completes the zone circuit in a fire alarm system.
What is an end of line resistor used for?
End Of Line Resistors Are The Last Line Of Defense. The end of line resistors (EOLR for short) are resistors designed for a pre-determined valued and used to control protected zones. Fire and gas alarms, burglar alarms, and emergency shutdown systems all respond to the emergency at hand on a pre-established condition.
Where are fire flame detectors used?
Flame Detection Industrial and commercial applications include oil and gas pipelines, turbine enclosures, off-shore platforms, automotive manufacturing facilities, aircraft hangers, munitions plants, nuclear facilities, and many, many more.
What class is EOL in fire alarm systems?
An EOL or End of Line Resistor is used to complete a circuit. The circuit needs to be completed to pass the continuity-testing electricity through all the wires of the Class A or Class B circuit. If the electricity stops flowing, a trouble is displayed on the panel.
Are smoke detectors normally open or closed?
Alarm systems are designed to use ‘open loop’ burglary sensors. While they are called ‘open loop’, they are actually ‘normally closed’ when the magnet is near the sensor or in other words the zone is ‘safe. Smoke and water sensors are usually ‘normally open’ and are used with an EOL resistor.
Where do End of line resistors go?
Where Should End of Line Resistors be Placed? An EOL resistor should always be installed at the last device in the loop and never inside the control panel. Placing resistors anywhere other than the end of the line does nothing to supervise the wiring, which is the reason for using resistors.
What is an inline resistor?
A single-in-line resistor package, as its name suggests, is a single line of resistors combined into a simple package that exposes each resistor as a pin and ties the other ends together into a common ground pin.
Is the eolr-1 an end of line relay?
Model EOLR-1 is an epoxy encapsulated single pull single throw (SPST) normally open relay that is activated by 9 to 40 VDC. This relay can be used as an end of line device in fire alarm systems, e.g., to supervise power supplies.
Why are eolrs used in fire and gas systems?
Fire zones usually use EOLRs. This is because fire sensors are “Normally Open” devices; they only close the circuit when they trip. Therefore, a fire zone in its normal state would appear the same to the F&G system as one where the wire has been cut: namely, open.
When to install an end of line eolr?
A fire EOLR should always be installed at the last device and never inside the control or across the zone defined as fire, as this is an inherent safety issue. Some equipment supports Double End of Line Resistors (DEOLR) to further differentiate between conditions that may exist on the loop.
How are eolrs used in a control panel?
The EOLR’s allow the control panel to differentiate between the two conditions by looking for a known resistance. Some manufacturers allow the use of double EOLRs, often referenced as DEOLRs. In this case, a second resistor is added across the terminals of the sensor, so that it is in parallel with the circuit.