Flame Detection
QFS SMD Sensor
KEMET’s QFS pyroelectric flame sensors combine high sensitivity with fast response times and high dynamic range to ensure rapid and accurate detection of small and large flames, nearby or over larger distances. These high quality sensors, in their small SMD package, integrate a digital, current mode read-out offering high responsivity over the full frequency range of flame flicker from 3 – 30 Hz. Industry standard I2C communication enables plug-and-play connectivity to microcontrollers and allows easy tuning and calibration. Programmable gain and filtering offer maximum flexibility in system design, and various optical filter options are also available. These sensors can be connected together in a linear series for synchronized sampling across devices. Their long and maintenance-free operational lifetime and various low power modes make these sensors ideal for any smart or IoT type of application.
| Part Number | Filter | Filter BW | Use | ||
|---|---|---|---|---|---|
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USEQFSEA22L180 |
2.20 μm | Long pass | Broadband flame detection | |
| USEQFSEA50L180 | 5.00 μm | Long pass | Human motion rejection | ||
| USEQFSEA391180 | 3.91 μm | 90 nm | Rejection Channel | ||
| USEQFSEA464180 | 4.64 μm | 180 nm | Flame channel (wide FoV) | ||
| USEQFSEA448180 | 4.48 μm | 620 nm | Flame channel (main detector) |
| Features and Benefits | Field of View | Applications for Rapid Fire Detection |
|---|---|---|
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QFSM SMD Sensor
The Flame Sensor Modules consist of a breakout board, on which a SMD flame sensor is mounted, ideal for easy evaluation and quick prototype development. A ribbon cable for flexible connection to user’s hardware or backplane and control board is included.
Part Number |
Including Sensor |
Filter |
Filter BW | Use |
|---|---|---|---|---|
| USEQFSM122L100 | USEQFSEA22L180 | 2.20 μm | Long pass | Broadband flame detection |
| USEQFSM150L100 | USEQFSEA50L180 | 5.00 μm | Long pass | Human motion rejection |
| USEQFSM1391100 | USEQFSEA391180 | 3.91 μm | 90 nm | Rejection channel |
| USEQFSM1464100 | USEQFSEA464180 | 4.64 μm | 180 nm | Flame channel (wide FoV) |
| USEQFSM1448100 | USEQFSEA448180 | 4.48 μm | 620 nm | Flame channel (main detector) |
Outfitted with all necessary components for the 1.8-3.6 V power supply of the device, all functionality of the sensor is routed out to a 10-pin 1.27mm pitch IDC connector on the back side of the 16 x 13.8 mm PCB. The build height including the socket is 9 mm. They provide up to 1 MHz Fast Mode+ I2C communication to configure the sensor and read data from it.
| Pin | Symbol | Type | |
|---|---|---|---|
 |
1 | Vsupply | Power supply |
| 2 | Unassigned | – | |
| 3 | SCL (I2C) | Digital in/out | |
| 4 | SDA (I2C) | Digital in/out | |
| 5 | CS | Digital in | |
| 6 | INT | Digital out | |
| 7 | SYNC | Digital in/out | |
| 8 | CLK | Digital in/out | |
| 9 | Unassigned | – | |
| 10 | GND | Ground |
There is a chip select/enable pin and an interrupt output available. The CLK/SYNC pins can be used to feed an external clock signal in to the board or, alternatively, distribute the clock signal of one board to several other boards, thereby creating a synchronized “network” of sensors.
| Part Number | Use | Type |
|---|---|---|
| USEQCSK0000000 | Control board for modules |
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USEQCSK0000000 can flexibly host up to four modules. With no hardware design work required, a combination of this backplane board and any of the attached SMD sensors can produce infrared sensor signal measurements out of the box in the early evaluation and design stages. This control board is provided with PC software allowing the user to configure and read out each of the SMD sensors connected. The sensor data is visualised in real time on a scope plot in the user interface. A csv file capture facility records the digital signals from the sensors for further processing by the user.
QFC Analog TO39 Sensor
KEMET’s QFC pyroelectric flame sensors provide accurate discrimination of flame sources in triple IR flame detection systems, through their excellent signal to noise characteristic at the signature 8 – 10 Hz flicker range of a flame. The sensor element is built into a low noise circuit that has an internal CMOS op amp with a 10 GΩ feedback resistor outputting a voltage signal centered around half the supply rail. Exceptionally high responsivity, a wide field of view and rapid recovery from thermal and electrical shocks makes it the ideal solution for demanding flame detection applications.
| Part Number | Filter | Cut On Wavelength | Cut Off Wavelength | |
|---|---|---|---|---|
 |
USEQFCSA338100 | 3.38 μm bandpass | 3.295 μm typical | 3.475 μm typical |
| USEQFCSA391100 | 3.91 μm bandpass | 3.865 μm typical | 3.955 μm typical | |
| USEQFCSA435100 | 4.35 μm bandpass | 4.05 μm typical | 4.65 μm typical | |
| USEQFCSA448100 | 4.48 μm bandpass | 4.17 μm typical | 4.79 μm typical | |
| USEQFCSA455100 | 4.55 μm bandpass | 4.34 μm typical | 4.76 μm typical | |
| USEQFCSA500100 | 5.00 μm cut on | 5.0 μm typical | – | |
| USEQFCSA550100 | 5.50 μm cut on | 5.5 μm typical | – |
| Features and Benefits | Applications for Rapid Fire Detection |
|---|---|
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QFCE Digital TO39 Sensor
KEMET’s QFCE pyroelectric flame sensors combine high sensitivity with fast response times and high dynamic range to ensure rapid and accurate detection of small and large flames, nearby or over larger distances.
These high-sensitivity flame detectors integrate digital front-end circuitry to provide all of the associated analog electronics required for sensing flame events. These events can then be interpolated by direct connection to a microcontroller. All of this occurs in an industry standard TO-39 package.
The thin film PZT substrate allows industry leading response times providing high responsivity over the full frequency of flame flicker from 3 to 30 Hz. The industry standard I2C communication interface not only provides plug-and-play connectivity to microcontrollers, but also allows easy tuning and calibration via programmable gain and filtering, offering maximum flexibility at system design level.
| Part Number | Filter | Cut On Wavelength | Cut Off Wavelength | |
|---|---|---|---|---|
 |
USEQFCEA391100 | 3.91 μm bandpass | 3.865 μm typical | 3.955 μm typical |
| USEQFCEA448100 | 4.48 μm bandpass | 4.17 μm typical | 4.79 μm typical | |
| USEQFCEA455100 | 4.55 μm bandpass | 4.34 μm typical | 4.76 μm typical | |
| USEQFCEA500100 | 5.0 μm cut on | 5.00 μm typical | - |
| Features and Benefits | Applications for Rapid Fire Detection |
|---|---|
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| Field of View
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QFS/QFC Evaluation Kit
To allow for further in-depth testing of these flame sensing and detection solutions, KEMET is proposing 2 evaluation kits, a digital one and an analog one. The purpose of these kits is to enable engineers and technicians to carry out simple and effective evaluation of KEMET flame sensors, experiment with the sample flame detection ratio based algorithm, and to capture measured data to a PC through the KEMET Flame Sensing Evaluation Tool software.
| Part Number | Use | Includes | |
|---|---|---|---|
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USEQFSK1000000 | SMD Flame Sensing Evaluation Kit (Digital) |
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| Part Number | Use | Includes | |
|---|---|---|---|
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USEQFCK9000000 | TO Flame Sensing Evaluation Kit (Digital) |
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| Part Number | Use | Includes | |
|---|---|---|---|
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USEQFCK4000000 | TO Flame Sensing Evaluation Kit |
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