Fireye® 45UV5-1005 1002420

The information provided in this bulletin is directed to competent boiler and combustion service technicians who are experienced in the installation and operation of Fireye® flame safety equipment. Persons not familiar with Fireye® products should contact the nearest Fireye® representative or other qualified service group. The 45UV5 scanners as well as all other Fireye® scanners, are designed to be used exclusively with the appropriate Fireye® flame safeguard and burner management controls. The application of these scanners to other than Fireye® equipment should be reviewed for approval by Fireye®. The 45UV5 scanners use a UV-eye detector. This detector is a sealed, gas filled, UV-sensitive tube containing two electrodes connected to a source of AC voltage. When UV radiation of sufficient energy falls upon the electrodes, electrons are released and the inter-electrode gas becomes conductive, resulting in an electric current flow from one electrode to the other. The current flow starts and ends abruptly and is known as an avalanche. A very intense source of UV radiation will produce several hundred avalanches or pulses per second. With less radiation there will be fewer pulses per second. Upon total disappearance of flame, the detector output ceases. Thus, the presence or absence of pulses is an indication of the presence or absence of flame; the frequency of the pulses is a measure of flame intensity. Pulses generated by the scanner are transmitted to a compatible Fireye® control via scanner wiring.

Fireye® 45UV5 Self-Check Scanner, 560 VAC, 50/60 Hz Frequency, 1 in NPT Connection, For Use With: 25RU8-4580, 25SU5-4018 and 61-5745-3 Shutter Drive Controls, Die Cast Aluminum, -40 to 200 deg F, Dimensions: 8.1 in L x 4.41 in W

• The components are contained in a cast aluminum housing sealed with an oil-resistant gasket
• The quartz lens is a planoconvex design, resulting in increased sensitivity
• Also included in the scanner is an electromagnetic shutter that permits a self-checking circuit to verify that the scanner and signal circuits are producing valid flame presence or absence information
• During the shutter closed period, the detector's optical path is blocked from flame radiation, allowing the amplifier control to verify the proper operation of the ultraviolet tube
• While the shutter is open, flame presence or absence is detected
• The resultant scanner output (while flame is detected) Is a continuous, periodically interrupted, pulsed flame signal which is a prerequisite for energizing the associated Fireye® control's flame relay

• Catalog https://assets.unilogcorp.com/267/ITEM/DOC/Fireye_45UV5_1005_Catalog.pdf
• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/Fireye_45UV5_1005_Specification_Sheet.pdf