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Siemens QRA2 UV Cell

£120.54 £63.99

Photocells & Flame Detectors

Photocells and flame detectors are designed to detect the safe operation of the burner. When the photocell is coupled with a suitable flame controller they produce a signal to allow the burner to continue to run in the presence of a flame, or to shut it down safely in the absence of a flame.

Photocells or flame detectors are generally only used where a ‘fail safe’ needs to be installed for commercial and industrial


The photocell or flame detectors job is to allow the flow of current and to convert AC current to DC current when it detects the presence of a flame.

UV Sensors

UV sensors have a tube that responds to ultraviolet radiation, this radiation emitted by the flame is then picked up by the UV sensor and tells the flame controller that there is a flame present and to carry on operating.

There are a few drawbacks to UV sensors though, one is that the UV sensors sometimes pick up radiation from non-flame related UV sources such as cosmic, gamma, and x-ray radiation. Despite this, countermeasures can be taken to ensure that there is always a correct reading of the flames presence or absence, these include:

  • The UV sensors view of the first third of the flame must be unobstructed.
  • The sensor should not sight the ignition spark.
  • The UV sensor cannot be subjected to excessively high temperatures.

Infrared Sensors

Infrared sensors can be used with either gas or oil flames, this is due to the characteristics of the flame, more than 90% of the flames radiation is infrared. This results in the infrared flame detectors being able to operate with a very high-intensity flame or a very weak one.

For the flame detector to work though, the sensor must have a good view of the flame, the infrared sensor must be protected from any direct flames, and the flame detector leads must be wired correctly according to standard procedure.

Why Buy Photocells From Power Heating Plants?

At Power Heating Plants, we value how precious time is and the importance of getting you back up and running as quickly as possible. With our knowledge and stock combined, we can get you back up and running with as little downtime possible. Did we mention we also have some of the most competetive prices for photocells and flame detectors on the web?