Hamamatsu C3704 series UV TRON driving circuits are low current consuming, signal processing circuits for the UV TRON Flame Detector, well known as a high sensitivity ultraviolet detecting tube. The C3704 series can be operated as a UV sensor by connecting the UV TRON and applying DC low voltage, as they have both a high-voltage power supply and a signal processing circuit on the same printed circuit board.

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Since background discharges of the UV TRON caused by natural excitation lights (such as a cosmic ray, scattered sunlight, etc.) can be cancelled in the signal processing circuit, the output signals from the C3704 series can be used without errors.

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When the high sensitivity sensor "UV TRON R2868" (sold separately) is used, the flame from a cigarette lighter (flame length: 25mm) can be detected even from a distance of more than 5m.� The UV Tron and Driver board can be bought together in a package.�

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For Additional Information see Hamamatsu’s Data sheet.� For Assembly See our Assembly/Information page.� For an example OOPic program see our downloads page.

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PRECAUTIONS FOR USE

• The UV TRON requires high voltage and the user must take any necessary precautions to protect yourself and others from any risks associated with electrical safety.

• Since the operation impedance is extremely high, the UV TRON should be connected as close as possible to the circuit board within 5 cm.

• Take care to avoid external noise since C-MOS IC is used in the circuit. It is recommended that the whole PC board be put in the shield box when it is used.

• To reduce current consumption, oscillating frequency is very low (approx. 20 Hz) in this DC-DC converter. Thus, the output impedance of the high voltage power supply is extremely high. If the surrounding humidity is high, electrical leakage on the PC board surface may lead to a drop in the supply voltage to the UV TRON. This voltage drop may result in lowered detection performance, so a moisture proof material (silicone compound, etc.) should be applied at the connecting point of the UV TRON, etc., if using the unit in a humid environment.