FLAME - EYEFLAME - EYE

OUTLINEOUTLINE

This equipment detects the lumen sity of This equipment detects the lumen sity of flame, and converts the existence of flame, and converts the existence of flame into electric signal. The flame eye flame into electric signal. The flame eye detecting the existence of flame, detecting the existence of flame, transmits its signal to the flame detector transmits its signal to the flame detector relay. Then this relay signal is connected relay. Then this relay signal is connected to the combustion indicating circuit or the to the combustion indicating circuit or the fuel oil shut off circuit of the burner fuel oil shut off circuit of the burner control circuit.control circuit.

SPECIFICATIONSPECIFICATION a) a) Flame eye :-Flame eye :- Type – FI TAF, FI TAS FI TAYType – FI TAF, FI TAS FI TAY

Detecting element – photo conductive cellDetecting element – photo conductive cell Temperature rating - -30 c to +80 c Temperature rating - -30 c to +80 c

Fitting method – PF ¾ universal flange Fitting method – PF ¾ universal flange Used cable – 2 core, screened cableUsed cable – 2 core, screened cable Detecting sensibility – more than 10 lux Detecting sensibility – more than 10 lux ( at 5000 – 7000 A )( at 5000 – 7000 A )

b) b) Flame detector relay :-Flame detector relay :- Type – FDR-1 TBJ ( for 100/115V, 50-60 HZ )Type – FDR-1 TBJ ( for 100/115V, 50-60 HZ ) FDR -2 TBJ ( for 200/220 V, 50-60 HZ )FDR -2 TBJ ( for 200/220 V, 50-60 HZ ) Temperature rating – surrounding temperature, Temperature rating – surrounding temperature,

max 55 max 55 Fitting method – 8 pin octal socket is usedFitting method – 8 pin octal socket is used Capacity of contact point – 3 A at AC 125 VCapacity of contact point – 3 A at AC 125 V Consumption of electric power 10 VA Consumption of electric power 10 VA

OPERATIONOPERATION a) flame eyea) flame eye – – The flame eye is fitted to the peep hole The flame eye is fitted to the peep hole

of air register or the front plate of boiler and it converts of air register or the front plate of boiler and it converts the burner flame condition in to electric signal. the burner flame condition in to electric signal. Describing more precisely the light of the flame reaches Describing more precisely the light of the flame reaches to the photoconductive cell, cds.to the photoconductive cell, cds.

The cds means cadomiumsulfide and The cds means cadomiumsulfide and it is a kind of semiconductor. It has such property that it is a kind of semiconductor. It has such property that the electric resistance decreases according to the the electric resistance decreases according to the increase of the intensity of light . the signal of light is increase of the intensity of light . the signal of light is converted to the electric signal utilizing this property. The converted to the electric signal utilizing this property. The cds used in this flame eye shows the electric resistance cds used in this flame eye shows the electric resistance of about 10 k ohm or 500 k ohm for the intensity of light of about 10 k ohm or 500 k ohm for the intensity of light of 10 or 1000 lux respectivelyof 10 or 1000 lux respectively

b) flame detector relayb) flame detector relay – –

This relay amplifies the electric This relay amplifies the electric signal which is transmitted from the flame eye by means signal which is transmitted from the flame eye by means of the silicon type transistor causes the miniature relay to of the silicon type transistor causes the miniature relay to act and the signal drawn out to the other part as an act and the signal drawn out to the other part as an electric contact point signal. When the flame eye does electric contact point signal. When the flame eye does not detect the flame the electric resistance of the flame not detect the flame the electric resistance of the flame eye shows more than 500 k ohm and the relay does not eye shows more than 500 k ohm and the relay does not operate. Contrarily when the flame eye catches the operate. Contrarily when the flame eye catches the flame the resistance decreases to less than 100 k ohm flame the resistance decreases to less than 100 k ohm and therefore the collector current of the transistor is and therefore the collector current of the transistor is increased resulting the working of the last relay. Since increased resulting the working of the last relay. Since this detector relay is of the plug in type it can be easily this detector relay is of the plug in type it can be easily inspected or exchanged.inspected or exchanged.

REGULATION REGULATION There is sensitivity regulation for the flame detector relay, as a There is sensitivity regulation for the flame detector relay, as a

regulation part. Sometimes it is difficult to catch the flame according regulation part. Sometimes it is difficult to catch the flame according to the different to place of the flame eye fitting and contrarily it may to the different to place of the flame eye fitting and contrarily it may happen to catch the flame from another burner. In such a case the happen to catch the flame from another burner. In such a case the flame detector relay should be regulated in the following procedure. flame detector relay should be regulated in the following procedure. By means of the rotation of the sensitivity regulation screw which is By means of the rotation of the sensitivity regulation screw which is placed on the upper face of the flame detector relay, the sensitivity placed on the upper face of the flame detector relay, the sensitivity is decreased and unless the intensity of light is high, the relay is decreased and unless the intensity of light is high, the relay cannot operate. Contrarily when it is revolved clockwise the cannot operate. Contrarily when it is revolved clockwise the sensitivity is increased and therefore even though the intensity of sensitivity is increased and therefore even though the intensity of light is low the relay can be operated. At this time it should be paid light is low the relay can be operated. At this time it should be paid attention that too high sensitivity results in impossibility for catching attention that too high sensitivity results in impossibility for catching accidental extinguishment. Thus as a procedure for regulation accidental extinguishment. Thus as a procedure for regulation during combustion of burner first the sensitivity regulation screw is during combustion of burner first the sensitivity regulation screw is to be revolved to the utmost. Secondly revolving the regulation to be revolved to the utmost. Secondly revolving the regulation screw slowly clockwise, the position where the relay can work screw slowly clockwise, the position where the relay can work should be found. Thirdly the regulation screw should be set at the should be found. Thirdly the regulation screw should be set at the position where it is revolved further about 10 degree clockwise from position where it is revolved further about 10 degree clockwise from this position. This is the best position of best sensitivity. this position. This is the best position of best sensitivity.

INSPECTIONINSPECTION

The flame eye should be occasionally The flame eye should be occasionally inspected because if some carbon or dust inspected because if some carbon or dust adheres to the front, the flame can not be adheres to the front, the flame can not be cached. But when the sealing air is normal cached. But when the sealing air is normal it will almost be kept clean.it will almost be kept clean.

How to check flame detector relay How to check flame detector relay

If this detector relay does not not work it should If this detector relay does not not work it should be checked as follows :be checked as follows :

First it is to be confirmed whether the sensitivity First it is to be confirmed whether the sensitivity regulation screw is in position of lowest sensitivity or regulation screw is in position of lowest sensitivity or not. Secondly the flame eye connecting terminals not. Secondly the flame eye connecting terminals should be put in short circuit by lead wire. At this time should be put in short circuit by lead wire. At this time if the relay can be operated, it may be considered that if the relay can be operated, it may be considered that it is in normal condition; but if not fuse etc should be it is in normal condition; but if not fuse etc should be checked.checked.

How to check flame eye How to check flame eye When the flame detector is normal the flame eye and the When the flame detector is normal the flame eye and the

lead wire should be checked. In this case, first the flame lead wire should be checked. In this case, first the flame detector relay is to be drawn out from its socket and detector relay is to be drawn out from its socket and then the ohm meter calibrated 0-100 ohm of the tester then the ohm meter calibrated 0-100 ohm of the tester should be connected between the socket pin no. 3 and should be connected between the socket pin no. 3 and no. 4. secondly the indicated value of the tester should no. 4. secondly the indicated value of the tester should be checked the flame eye being lighted. In this case the be checked the flame eye being lighted. In this case the tester shows the value less than 5 – 40 k ohm , if the tester shows the value less than 5 – 40 k ohm , if the flame eye is normal. When the flame eye is not lighted flame eye is normal. When the flame eye is not lighted the value more than 500 kilohm is showed. If these the value more than 500 kilohm is showed. If these values are not showed cds should be exchanged . values are not showed cds should be exchanged . incorrectness of cds depends principally upon the incorrectness of cds depends principally upon the temperature. In the case of incorrect cds therefore it temperature. In the case of incorrect cds therefore it should be checked whether the sealing air is in the should be checked whether the sealing air is in the condition of regular values. condition of regular values.