Pyroelectric Flame Sensor

（Model: RPFA913CG）

User’s Manual

Version: 1.0
Valid from: 2022-09-01

Zhengzhou Winsen Electronics Technology Co., Ltd

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Zhengzhou Winsen Electronics Technology CO., LTD.

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RPFA913CG Pyro-electric Flame sensor

RPFA913CG pyro-electric flame sensor uses lithium

tantalate single crystal as the sensitive element material.
The Curie temperature of lithium tantalate crystal material
is above 600℃, the relative dielectric constant is small,
and the specific detectivity is high.

In a wide range of room temperature, the pyroelectric

coefficient of the material changes very little with
temperature, and the temperature change rate of the
output signal is only 1-2‰. The temperature stability of
the sensor performance is very good, and the spectral
response consistency is very good in the wavelength range
of 1-20um.

Features:
* 5.0um detection band;
* TO-5 package, single channel, voltage mode;
* Low microphone effect, large FOV, high detection rate;
* Detection band measurement of flame signal;

Applications:
It’s widely used in various oil storage stations, large warehouses, factory workshops, forests,
charging piles; and standard configuration for high fire risk areas such as petroleum, chemical,
paper-making, forests, and garages.
It also becomes popular in high-end residential, commercial, and general industrial fields.

Size(Unit:mm)

Unit: mm

Sensitive element

Top view Bottom view Side view

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Parameters Table 1

Item Typical Unit

Window Size 5.0*5.0 mm
Sensitive element size 3*3 mm
Filter center wavelength 5.0 um
Electrical time constant 5 s
Thermal time constant 200 ms
Source Voltage 0.4~0.7 v
Working Voltage 2~15 v
Recommended voltage 3~5 v
Output signal V0
4.3±10% v
(500K,10HZ,25℃)
Output noise voltage VN
≤150 mv
(10HZ, BW1HZ, 25℃)
Voltage response rate (no window) Rv
≥500 v/w
(500K, 10HZ, 25°C)
Specific detection rate (no window) D*
≥5×108 cmHz½ /W
(500K, 10HZ, BW1HZ, 25℃)
Field of view(FOV) >115 °
Detection distance >35 m
Working temperature/ Storage
-40~+85 ℃
temperature
Remarks: The magnification of the testing machine is 80dB.

Internal circuit
Sensor 1 pin Vd is the drain of the field effect transistor, and voltage is applied;
pin 2 Vs is the output signal; pin 3 GND is grounded.
Lithium tantalate sheet and a high resistance Rg form a parallel circuit, and then connect to
the gate of the field effect transistor.

Vd Drain electrode

Vs Source electrode

Dotted line: internal circuit

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Testing circuit

+5v

-5v

Application circuit

Filter parameters

5.0um narrow band filter spectral curve

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Filter parameters of commonly used sensor models:

Part No. RPFA913CC RPFA913CD RPFA913CE RPFA913CF RPFA913CG

Center wavelength (nm) 3800±40 4300±50 4400±40 4480±40 5000±40
Full width at half maximum
180±20 600±40 400±20 620±20 180±20
FWHM (nm)
Transmittance (%) ＞90% ＞90% ＞90% ＞85% ＞90%

Notes:
(1) Pyroelectric infrared sensors are piezoelectric and are very sensitive to sound, electromagnetic waves
and vibration. When using pyroelectric infrared sensors, proper shock absorption and shielding are
necessary.
(2) In order to avoid turbulent air flow and crosstalk, which may cause false alarms, when the sensor is used
in the design of the flame detector, window protection (such as white sapphire, calcium fluoride or infrared
glass, etc.) must be added.
(3) When welding the pyroelectric infrared sensor, it is recommended to solder at a position above 3mm.
When using a soldering iron for manual soldering, the temperature of the soldering iron tip should be
controlled below 350℃, and the soldering time for each location is less than 3 seconds, and the tube should
be clamped with tweezers, to prevent damage to the electronic components under high temperature
conditions.
(4) During the installation and use of the pyroelectric infrared sensor, prevent the sensor components from
falling. The sensor should be stored in a dry environment.
(5) When operating the pyroelectric infrared sensor, the temperature of the pyroelectric infrared sensor is
changed due to hand contact, especially through welding. Therefore, when the sensor is working again, it is
necessary to wait for a period of time. After the temperature of the sensor is balanced, resume normal work.
(6) Do not touch the sensor window directly with your hands and hard objects. Keep the window clean.
When there is dirt, use an alcohol cotton ball to gently wipe it clean.
(7) When installing the sensor, it is forbidden to apply mechanical pressure to prevent damage to the
sensor's sensitive elements, windows and other components due to the existence of pressure.
(8) When the sensor is taken out from the packaging box, and during measuring and installing, it must be
equipped with electrostatic protection tools. The electrostatic protection requirement is less than 2000V to
prevent the high voltage from breaking down the field effect tube of the sensor.

Note: To keep continual product development, we reserve the right to change design
features without prior notice.
Zhengzhou Winsen Electronics Technology Co., Ltd
Add: No.299, Jinsuo Road, National Hi-Tech Zone, Zhengzhou
450001 China
Tel: +86-371-67169097/67169670
Fax: +86-371-60932988
E-mail: sales@winsensor.com
Website: www.winsen-sensor.com

Tel: 86-371-67169097/67169670 Fax: 86-371-60932988 Email: sales@winsensor.com