C3704 HAMAMATSU | Alldatasheet
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Technical content
UV TRON ® DRIVING CIRCUIT C3704 SERIES Compact, Lightweight, Low Current Consumption, Low Cost Operates as High Sensitivity UV Sensor with UV TRON Suitable for Flame Detectors and Fire Alarms Hamamatsu C3704 series UV TRON driving circuits are low current consuming, signal processing circuits for the UV TRON, 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. 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. 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.
APPLICATIONS
l Flame detectors for gas and oil lighters l Fire alarms l Combustion monitors for burners l Electric spark detector l UV photoelectric counter SPECIFICATIONS 10 ms width pulse output (Note : 1) (with no condensation) (such as R2868) C3704 C3704-02 C3704-03 Input Voltage 10 to 30 Vdc5Vdc ± 5% 6 to 9 Vdc Current consumption 3 mA Max. 300µA Max. 300µA Max. Note 1: The output pulse width can be extended up to about 100s by adding a capacitor to the circuit board. Note 2: Since the output impedance of this power supply is extremely high, an ordinary voltmeter cannot be used. Use a voltmeter that has an input impedance of more than 10 GΩ . Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office. Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are subjected to change without notice. No patent rights are granted to any of the circuits described herein. © 1997 Hamamatsu Photonics K. K. TPT A0024EA Figure 1: Dimensional Outline (Unit : mm) -+ 1 2 3 K A 3.54- <Top View> <Side View> 1.6 MAX.