UV90L-1R Riello UV90L UV photocell

UV90L-1R Riello UV90L UV photocell

The UV90L Series UV Probes are designed for viewing the fire from the side (90°) or from the front, which allows for a clearer view of the flame in certain applications. The UV90L probes come with a unique mounting block that eliminates the need for a threaded viewing tube. The UV tube is made of quartz and filled with an ionizable gas that ionizes when exposed to the ultraviolet radiation from the flame. When the UV radiation is gone, the gas is an inert gas that fills the tube, isolating the electrodes in the tube, which carry a continuous high voltage. During combustion, the UV rays ionize the gas and pulses of current flow through the electrodes. These pulses of current generate flame signals that are transmitted to the amplifier in the controller, which trigger the flame relay and maintain it.

Technical Parameters

Operating Voltage: (S1-S2): 300 VDC (recommended), 400 VDC (maximum)

Operating Temperature Limits: Maximum: 200° F (94° C) Minimum: -40° F (-40° C)

Humidity: 85% relative humidity, non-condensing