Sentry CR105 Manual download pdf (Page 11)

U7698E Flame Detector

Part 334614E

E 2002 Nordson Corporation

Manual 34-49

A DIN connector mounted on the electronics module plugs into the

connector board in the housing.

The detector heads scan the IR spectrum. They use intelligent, real-time

signal processing to tell the difference between a real fire and false-alarm

radiant energy sources.

Each detector head continuously monitors itself via a through-the-lens test.

Two clear (white) LEDs on the top of the sensor module light to run the test.

If the test fails, the detector head goes into fault mode and the amber fault

indicator on the panel lights.

Each detector head also has two red power LED indicators, visible through

the lens. The detector head lens is continuously cleaned by low-pressure

air flowing from the air shield.

Theory of Operation

Power is supplied to the indicator panel from the booth electrical panel. The

indicator panel supplies 24 Vdc power to the detector heads.

Flame Detection

If a flame is detected inside the booth, interlock relays in the indicator panel

open and shut down the booth exhaust fan, application equipment, and

conveyor. The red FIRE DETECTED indicator lights and the FIRE

DETECTED alarm sounds.

Faults

The DET. HEAD FAULT indicators and and the FAULT DETECTED alarm

alert operators to problems with the detector heads. There are two fault

modes:

Fault: A fault occurs when one detector head loses power, fails a

through-the-lens test, or has a sensor or electronics module malfunction.

The fault indicator for that detector head lights and the fault alarm sounds.

No interlocked equipment is shut down if two detector heads are installed

and only one has a fault. If only one detector head is installed, then any

fault is a major fault.

Major Fault: A major fault occurs when both detector heads lose power,

fail a through-the-lens test, or have a sensor or electronics module

malfunction. Both fault indicators light and the fault alarm sounds. If only

one detector head is installed, then any fault is a major fault. A major fault

shuts down the booth and application equipment. The conveyor will

continue to run. The conveyor shuts down only if a flame is detected.

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Sentry CR105 Manual Page 11