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
q
q
q
q
q
Flame detectors for gas and oil lighters
Fire alarms
Combustion monitors for burners
Electric spark detector
UV photoelectric counter
Figure 1: Dimensional Outline (Unit : mm)
4- 3.5
5
- +123
9
7
5
3
SPECIFICATIONS
Dimensional outline ..................................................... Figure 1
Weight ................................................................... Approx. 20g
Output signal ....... Open collector Output (50 V, 100 mA Max.)
10 ms width pulse output (Note : 1)
UV TRON supply voltage .......................... DC 350 V (Note : 2)
Quenching time ................................................. Approx. 50 ms
Operating temperature ......................................... -10 to +50°C
(with no condensation)
Suitable UV TRON ............... Low voltage operation UV TRON
(such as R2868)
C3704
Input Voltage
Current consumption
C3704-02
C3704-03
6 to 9 Vdc
15
MAX.
60
K
A
5
60
<Top View>
10 to 30 Vdc 5Vdc
±
5%
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.
<Side View>
1.6
3 mA Max. 300µA Max. 300µA Max.
TPT A0024EA
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.
HAMAMATSU [ HAMAMATSU CORPORATION ]
