Model 591

UV-IR² Flame Detector

· Three sensors - minimal false alarms

· Selectable high speed responses

· Cone of vision up to 120 degrees       

· Selectable UV or IR pre-alert

· Selectable output options

· Enclosure to IP65

· Low current

OPERATION

 

The detector responds to Ultra Violet (UV) and Infra Red (IR) flickering radiation emitted from flames during combustion.

 

The narrow spectral response (185 to 260nm) of the UV sensor is completely insensitive to visible light, but quickly detects weak UV radiation emitted from flames.   The UV sensor also responds to high-voltage electrical discharges.

 

The dual IR sensors (IR²), responds adjacent IR wavelengths (1.0 to 2.7µm ), enable it to discriminate between flames and spurious IR sources. The IR sensors also respond to glowing embers but will ignore electrical discharges.

 

The combination of UV and IR² detection, plus signal processing allows the detector to be used without risk of false alarms in difficult situations characterised by factors such as flickering blackbody radiation or arc welding.

 

Most other UV-IR Flame Detectors respond to 4.3µm IR light, emitted by hydrocarbon flames. By responding to 1.0 to 2.7µm light emitted by every fire all flickering flames can be detected. Gas fires not visible to the naked eye e.g. hydrogen may also be detected.

 

+       -         +R    -R        (N/O)           (N/C)

14 - 28         Remote      Flame          Fault

   Vdc             test           Relay          Relay

supply          input           RL1             RL2

                                                               or

                                              pre-alarm (N/O)

ELECTRICAL CONNECTIONS

 

The Flame Detector is designed to be connected to a two wire circuit supplying 14v to 28v dc supply.   The detector is connected to the supply via terminals 1(+IN) and 2(-IN) under the front terminal cover.   Connections to the detector are polarity sensitive.

 

A remote alarm 0.1A output drive is available between terminals 3(+R) the +drive and 4(-R) 0V.  This output can be factory set to current limit to 2mA for LED indicators or as an input for remote test option.   See Fig. 1. below.

Fig. 1.

e.mail: sales@intronics.co.uk

 

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