65UV5-1004EC Flame Scanner with Internal Flame Relay

Description

65UV5-1004EC  Integrated Flame Scanner with Internal Flame Relay

The Fireye 65UV5 flame scanner is a microprocessor-based flame scanner utilizing an ultraviolet
tube-type sensor and an electro-mechanical self-checking shutter mechanism. The Fireye 65UV5
flame scanner incorporates an internal flame relay with a fixed ON/OFF threshold thereby eliminating the need for an external flame amplifier.
The 65UV5 scanner is available with a one-second or four second flame failure response time
(FFRT) depending on the model selected. The “E” versions are one second FFRT, the non-”E” versions are

four seconds FFRT. The Fireye 65UV5-1004QD, -1004EQD flame scanner provides an
analog 4 to 20 mA output referenced to flame signal strength.
The Fireye 65UV5 flame scanner is powered from a 24 Vdc power source provided externally and
includes an integral 8 pin quick disconnect connector. A color-coded internal LED indicates flame
status and alarm condition. This can be viewed through a viewing port on the rear cover.
The 65UV5 housing has a NEMA 4X / IP66 rating. The unit is suitable for use in Class 1, Div. 2
hazardous environment groups A, B, C & D or Ex II3 G/D Ex nA IIC T4A.
65UV5 CEX models are wired directly via a terminal rail located within the CEX housing. Suitable
glands must be used to terminate the cable at the housing.
Note: The 65UV5-1000, -1000E scanners became obsolete in 2008, and were replaced by the
enhanced capability of the 65UV5-1004 and -1004E scanners. The 65UV5-1004QD and -1004EQD
models with electrical quick-disconnect have replaced the original models equipped with ten feet of
captive cable.

65UV5-1004EC

The 65UV5 scanners use a UV-eye detector. This detector is a sealed, gas filled, UV-sensitive tube
containing two electrodes connected to a source of DC 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. When the
pulses reach a sufficient level, the internal flame relay is energized.

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