Product Specification

Photocells

Flame Sensors For Fuel Oil Burners

FC Series Flame Sensors Introduction
Flame detection in fuel oil burners occurs by means of sensors detecting the presence of flame through an electrical signal, which can be used by ignition and control devices. 
Generally, to detect the presence of flame in these appliances a photocell is used, which exploits the light generated by the flame itself.

FC Series Flame Sensors Description
These are the most used flame sensors for fuel oil burners. Photocells vary their ohmic resistance according to the light incidence; this property is exploited to detect the occurred flame generation in burners.
Various types of photocells are available, differing from each other in their application and casing. Fig.1 shows the FC7, FC8 and FC9 photocells; the difference between FC7 and FC8 models consists in the detecting element, which lights up laterally in the FC7 and frontally in the FC8. The FC9 photocell is suitable to be light up laterally; an inbuilt diode enables this photocell to be used with particular devices (for example Brahma 32C, 32CN, GS2, GP2. ). Fig.2 shows the FC11, FC13 and FC14 photocells, differing from each other only in the fixing system, as both of them light up laterally and frontally. Fig.3 shows FC14 and FC14L photocells, differing from each other in the case length, even if both of them are able to be light up laterally and frontally. They are provided with a connection plug which facilitates assembly and maintenance operations. The standard length of the photocell connecting cable is 600mm; the operating temperature range ensuring the longest life of flame sensors (approximately 50,000 hours) is comprised between 0°C and +60°C.

FC Series Flame Sensors Sensitivity
The sensitivity of photocells can be identified through the colour of their casing, according to the following directions:
        /N  Black
        /R  Red
        /A  Blue
        /V  Green
The colour red indicates photocells with standard sensitivity, the colour blue corresponds to the most sensitive photocells, whereas the colour green marks the least sensitive photocells.
For the right coupling between photocell and control device please refer to our technical literature regarding control devices making use of these flame sensors.

Followings are the sensitivity ranges of the available flame sensors: