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 |