Figure 2: Schematic Diagram

HAMAMATSU PHOTONICS K.K., Electron Tube Center

314-5, Shimokanzo, Toyooka-village, Iwata-gun, Shizuoka-ken, 438-0193, Japan, Telephone: (81)539/62-5248, Fax: (81)539/62-2205, Telex: 4225-186HAMAHQ

U.S.A.: Hamamatsu Corporation: 360 Foothill Road, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1)908-231-0960, Fax: (1)908-231-1218

Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658

France: Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: (33)1 69 53 71 00, Fax: (33)1 69 53 71 10

United Kingdom: Hamamatsu Photonics UK Limited: Lough Point, 2 Gladbeck Way, Windmill Hill, Enfield, Middlesex EN2 7JA, United Kingdom, Telephone: (44)181-367-3560, Fax: (44)181-367-6384

North Europe: Hamamatsu Photonics Norden AB: Färögatan 7, S-164-40 Kista, Sweden, Telephone: (46)8-703-29-50, Fax: (46)8-750-58-95

Italy: Hamamatsu Photonics Italia S.R.L.: Via Della Moia, 1/E 20020 Arese, (Milano), Italy, Telephone: (39)2-935 81 733, Fax: (39)2-935 81 741

(Note 3)

POWER SUPPLY INPUT AND SIGNAL OUTPUT POINT

1 : SIGNAL OUTPUT Q

2 : SIGNAL OUTPUT Q

3 : OPEN COLLECTOR OUTPUT

PRECAUTIONS FOR USE

q

Since the operation impedance is extremely high, the UV TRON should be connected as close as possible to the circuit

board within 5 cm.

q

Take care to avoid external noise since a 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.

q

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 detec-

tion performance, so a moistureproof material (silicone compound, etc.) should be applied at the connecting point of the

UV TRON, etc., if using the unit in a humid environment.

q

A model equipped with a flame sensor (R2868) is also available.

Figure 3: Method of Connection

TPT C0004EA

Note 3: No load can be driven by an output from points “1” and “2” because these signals are

output from the only C-MOS IC directly. When a load such as a buzzer and a relay is

connected to this circuit, it should be connected to the point open collector output. The

transistor ratings of the open collector is 50V, 100mA. Be careful not to exceed the ratings.

Note 4: The output pulse width is set to 10ms at shipping. If the pulse width needs to be

extended, add a capacitor to this point. (When using an electrolytic condenser, make

sure the polarity is correct.)

e.g. CX = 1

µF: Pulse Width

1s, CX=10

µF : Pulse Width

10s

Cx : POINT FOR ADDING A CAPACITOR TO

EXTEND OUTPUT PULSE WIDTH

(Note 4)

CONNECTING POINT OF UV TRON

A : Connecting Anode of UV TRON

K : Connecting Cathode of UV TRON

v

JUMPER LEAD FOR SETTING

BACKGROUND CANCEL LEVEL

This background cancel circuit outputs signal pulses

of 10ms width only when 3 to 9 pulses enter the

circuit with a time interval of 2 seconds or less from

the UV TRON. Cancel level can be set in 4 steps

(number of pulses: 3, 5, 7, 9) by this jumper lead.

Connect to “3” for general use. When using where

much natural excitation light is present, set the

cancel level at a higher step (5, 7, 9).

TPT1007E01

JUL.1997 CR

Created in Japan

UV TRON

(SOLD SEPARATELY)

K

A

CATHODE

ANODE

POWER SUPPLY

+

–

GND

CONSTANT *

VOLTAGE

CIRCUIT

HIGH VOLTAGE

DC-DC

CONVERTER

JUMPER LEAD FOR SETTING

BACKGROUND CANCEL LEVEL

* Not included in C3704-02.

OPEN COLLECTOR

OUTPUT (3)

Q (1)

Q (2)

10 ms

(Note 4)

GND

GND

5V

5V

Q

Q

OUTPUT SIGNAL

WAVEFORM

7

SIGNAL

PROCESSING

CIRCUIT

3

9

5

+350Vdc

Tr : 50 100mA

•

+5Vdc