This Fireye Flame Meter, measuring 2 1/4 inches, operates within a range of 0-3 Volts Direct Current (VDC). The device is designed to monitor and measure the intensity of the flame in industrial combustion systems. It uses advanced technology to convert the flame's light intensity into an electrical signal, which is then displayed on the meter. The output voltage ranges from 0 to 3 VDC, providing a precise measurement of the flame's strength. This product is essential for maintaining optimal combustion efficiency and safety in various industrial applications.