Danfoss UV Data sheet

Data sheet

Ultraviolet Flame Sensor UV

Application		Danfoss UV sensors are used to detect the flame
		in blue flame oil burners. They are intended for
		use together with Danfoss controls in the OBC 80
		and BHO 70 series.
		The UV sensors meet the requirements of the
		EN230:2005 standard and also meets the
		requirements of the RoHS and WEEE Directives.

Function	Light rays are sent at different wavelengths. The
	light that the human eye can see lies in the range
	of 380 to 760 nm and is called visible light.
	In the blue flame oil burner the flame’s visible
	light is very dim and therefore cannot be
	detected by the LD/LDS sensor series, which is
	built on the photoresistance principle.
	In the case of UV sensors, the flame’s ultraviolet
	light is used instead, which is detected by a UV
	diode. In the sensors, the sensor signal is
	converted by an amplifier circuit into a signal that
	the control can use.

To ensure unambiguous detection of the ultraviolet light, it is first transmitted through a lens that focusses the light rays onto the surface of the UV diode, and then through a filter that reduces the sensitivity to a desired wavelength range.

Danfoss UV sensors have max. sensitivity at 375 nm, which is apparent from the logarithmic diagram, where sensitivity at 375 nm is given to 100%.

Ultraviolet light	Visible light	Infrared light

Wavelength

10 nm

380 nm

760 nm

1 mm

© Danfoss | 2019.07

VD.AU.A3.02 | 1

Data sheet	Ultraviolet Flame Sensor UV

Electrical connection	The UV sensors are connected to Danfoss
	controls in the OBC 80 and BHO 70 series as
	shown in the diagram.

Note that the blue wire must be connected to terminal 11 and not to the common 0 on terminal 2 or the appertaining auxiliary terminals in the base section.

1	2			3	1. Brown
					2. Blue
					3. Black

Mounting	The UV sensors are designed to be very direc-
	tional to limit the influence of other light sources,
	primarily the ignition spark that emits UV light.
	The sensors must be installed so that they are not
	affected by light from the ignition spark and, at
	the same time, so that the best possible input
	from the flame is achieved.
	It is very important that the mounting flange or
	piping used has the UV sensor fixed in the correct
	position.

The UV sensors’ sensitivity is shown as a function of the angle deviation in Fig. 1 and 2.

If a sufficient signal is not achieved, we recommend selecting a UV sensor of higher sensitivity. To determine the quality of the signal, use the measurement setup below.

If there is no flame/darkness, the value should be ≤ 5 µA and when there is a flame/light it should be ≥65 µA.

Fig. 1

Fig. 2

Fig. 3

2 | VD.AU.A3.02

© Danfoss | 2019.07