Gas Sensors
QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Overview
Applications
KEMET’s QGS thin film digital pyroelectric IR sensors for
gas detection and concentration measurement combine
high sensitivity with fast response times and high dynamic
range to ensure rapid and accurate detection of target
gases.
• Gas and gas flues
• HVAC (refrigerant or CO2-driven ventilation system)
• Industrial process and safety
• Medical capnography and anesthesia
• Handheld breath analysis and breath rate measurement
• Breath actuated dispenser
• Automotive cabin air quality
• Exhaust (CO2 content)
• Home and building technology
• Environmental monitoring (ambient CO2 level)
• Pollution air quality in home, office and car
(excessive CO2 level)
These high quality sensors, in their small SMD package,
integrate a digital, current mode read-out that enables
lower IR-emitter duty cycles, thereby savingsignificantly on
system level power consumption, while maintaining high
SNR. Industry standard I2C communication enables plugand-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 linear series to allow synchronized
sampling across devices.
Their long and maintenance-free operational lifetime
makes them ideal for highly demanding automotive or
medical applications.
Benefits
• High sensitivity with fast response time
• High dynamic range
• Small SMD package
• I2C communication compatible
• Digital output
• Programmable gain and filltering
• Various optical filter options
• Integrated configurable amplifier, filter and ADC
• Low power comsumption
One world. One KEMET
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Ordering Information
USE
QGS
E
A
REF1
8
0
Product
Family
Series
Sensor
Type
Mounting
Type
Specification
Packaging
Version
QGS =
SMD IR Gas
Sensors
E = Serial output
M = Serial module
K = Evaluation kit
A = Sensor only
1 = Module type 1
3 = Kit type 3
0 = Bulk
8 = 7" Tape & Reel
0
Sensors
0000 = Fixed
REF1 = Reference
C821 = CO2
CH41 = CH4
N8L1 = NO
22L1 = 2.20 µm long pass
50L1 = 5.00 µm long pass
4641 = 4.64 µm
Environmental Compliance
All KEMET Gas Sensors are RoHS and REACH Compliant.
Article 33(1) of the REACH Regulation states that manufacturers and importers of articles (products) are required to notify
their customers of the presence of any Substances of Very High Concern (SVHC) in their products exceeding 0.1% by weight
and provide instructions on safe use of the product.
KEMET Corporation reports regarding the Article 33(1) of REACH Regulation as follows:
1. Applicable Product: Gas Sensors (QFC & QFS series)
2. Report for the content of REACH SVHC list:
The product(s) above contains a substance by more than 0.1wt% per product weight that was published in the 8th update of
the REACH SVHC substances (December 19, 2012).
3. Regarding the safety of the gas sensors (Piezoceramic products):
The Piezoceramic that is used in this product becomes ceramic by sintering powder containing PZT as the main ingredient. It
is chemically stable, with minimum risks toward the human body or environment within the intended use of the product. Please
note that risks could occur in the case of inhalation or accidental oral uptake of powder ceramics.
4. Technical product information on the gas sensors (Piezoceramic products):
The manufacturing technique of the “piezoceramic products” whose main ingredient is Lead Titanium Zirconium Oxide (PZT)
has been established, and there is no alternative material that can exhibit superior performance than PZT at this moment.
Please note that the piezoceramic is listed as an exempt on RoHS (2011/65/EU) AnnexIII (7c.1).
5. The responsibility of piezoceramic manufacturers:
Piezoceramic manufacturers report information regarding PZT containment in their products to the customers to obey the
article 33 of the REACH regulation.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Dimensions – Millimeters
Sensor
1.700
0.725
3.700
28
1
15
9
Ø1.650
0.325
0.400
1.200
4.600
0.975
5.650
2.050
23
0.226
0.250
24
14
10
0.500
3.050
0.550
1.370
1.55 Maximum
24 - SYNC
25 - INT
26 - SDA
27 - SCL
Pin 1
Indication
28 - GND
Pin Configuration of Sensor
VSupply - 1
CAP - 3
23 - CS
29 - GND
GND - 5
GND - 7
21 - CLK
19 - GND
30 - GND
17 - GND
TRANSPARENT TOP VIEW
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Dimensions – Millimeters cont.
Module
10.000
16.000
8.5
3.6
16
13.800
Field of View
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0214_QGS • 4/17/2020
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Performance Characteristics
Signal Filtering & Power Modes
Power Mode
(base sample rate)
High Pass Filter – Analog
(Hz)
Fixed
Analog
Low Pass
Filter (Hz)
Fixed
Digital Low
Pass Filter
(Hz)
Digital Low Pass
Filter (Hz)
Maximum
ADC
Sampling Rate
(sps)
Normal Power Mode
Off
1.0
2.0
4.0
8.0
600
250
180.0 90.0
45.0
22.5
1,000
Low Power Mode
Off
0.17
0.33
0.66
1.30
100
42
30.00 15.00
7.50
3.75
166
Item
Power consumption
Operational state
Mode
Description
Typical Current
Consumption
(1.8 V, room temperature)
Normal Power Mode
Normal power consumption, 1 kHz maximum sample rate
22 µA
Low Power Mode
Low power consumption, 166 Hz maximum sample rate
3.5 µA
Normal Operation Mode
Sensor signal readout over I2C
22 µA
Sleep Mode
Hardware interrupt on infrared trigger
21 µA (Normal Power Mode)
3.5 µA (Low Power Mode)
Power Down Mode
Sensor is disabled
1.1 µA
Infrared Frequency Characteristics
Typical Frequency Response in
Normal Power Mode
Typical Frequency Response in
Low Power Mode
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Typical Frequency Response at
Different Gain Settings
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Part Number Specifications
Sensor Characteristics
1
Filter Aperture
(mm)
Element Size
(mm2)
SMD Package
(mm)
D*1
(cm√Hz/W)
Typical
NEP1
(W/√Hz)
Typical
Time Constant
(ms) at 10-20
Hz peak
Field of
View
φ 1.65
0.64 x 0.64
5.65 x 3.70 x 1.55
2.5 x 108
2.7 x 10−10
~10
~90°
10 Hz, 500 K, room temperature, without window and optics.
Electrical Characteristics
Supply
Supply
Voltage
Current
(V)
(μA) Typical
1.75 to 3.60
Digital I/O
I2C
(FM+ compatible)
1 to 23
Part Number (Sensor)
Part Number
USEQFSEA391180
USEQFSEA22L180 2
USEQFSEA50L180 2
USEQFSEA464180 3
USEQGSEAC82180
USEQGSEACH4180
USEQGSEAN8L180
1
Operating
Storage
Temperature Temperature
Range (°C)
Range (°C)
ΔΣ ADC
at 1 ksp
15 bit
−40 to +85
−40 to +110
Sensor
Read-out
Configurable
Current mode
Gain
Digital filtering
Sampling rate
Power modes
Filter (μm)
Filter BW (nm)
Use
Weight (gr)
3.91
2.20
5.00
4.64
4.26
3.3
5.3
90
Long pass
Long pass
180
180
160
180
Reference
Broadband
Broadband
CO
CO2
CH4
NO
0.07
0.07
0.07
0.07
0.07
0.07
0.07
From the QFS Flame Sensors series, used for reference.
From the QFS Flame Sensors series, used with bespoke, customer or application-specific (narrowband) filters mounted externally.
3
From the QFS Flame Sensors series, used as gas or active filter.
1
2
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0214_QGS • 4/17/2020
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Part Number Specifications cont.
Part Number (Module)
Part Number
USEQFSM1391100
USEQFSM122L100 2
USEQFSM150L100 2
USEQFSM1464100 3
USEQGSM1C82100
USEQGSM1CH4100
USEQGSM1N8L100
1
Comment
Weight (gr)
Includes sensor: USEQFSEA391180
Includes sensor: USEQFSEA22L180
Includes sensor: USEQFSEA50L180
Includes sensor: USEQFSEA464180
Includes sensor: USEQGSEAC82180
Includes sensor: USEQGSEACH4180
Includes sensor: USEQGSEAN8L180
5.40
5.40
5.40
5.40
5.40
5.40
5.40
From the QFS Flame Sensors series, used for reference.
From the QFS Flame Sensors series, used with bespoke, customer or application-specific (narrowband) filters mounted externally.
3
From the QFS Flame Sensors series, used as gas or active filter.
1
2
Part Number (Evaluation Kit)
Part Number
Comment
Weight (gr)
USEQGSK3000000
USEQCSK0000000
Includes 2 sensors: USEQFSEA391180 and USEQGSEAC82180
Control board for modules, maximum 4 modules can be connected on one control board
300
250
Landing Pattern
Recommended PCB Landing Pattern
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SE0214_QGS • 4/17/2020
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Part Schematic
Sensor
Analog
Front-End
Reference/Regulator
VDD
CS
INT
SDA
SCL
Digital Filter
FIFO
Timing Ctrl
Interrupt Ctrl
Wake-up
15b
∆Σ
ADC
I2C
Block Diagram
M
C
U
CLK
SYNC
Clock Generator
GND
VCC (1.8 - 3.6 V)
>100nF
Soldering Process
Recommended Reflow Soldering Profile
Preheat/Soak
Temperature Minimum (TSmin)
Temperature Maximum (TSmax)
Time (ts) from Tsmin to Tsmax
150°C
200°C
60 – 120 seconds
Ramp-Up Rate (TL to TP)
3°C/second maximum
Time Above Liquidous (tL)
60 – 150 seconds
Liquidous Temperature (TL)
Peak Temperature (TP)
Time within 5°C of
Maximum Peak Temperature (tP)1
Ramp-Down Rate (TP to TL)
Time 25°C to Peak Temperature
1
Pb-Free Assembly
217°C
260°C
TP
TL
Temperature
Profile Feature
tP
Maximum Ramp-up Rate = 3°C/second
Maximum Ramp-down Rate = 6°C/second
TC −5°C
tL
Tsmax
Tsmin
ts
25
25°C to Peak
Time
30 seconds maximum
6°C/second maximum
8 minutes maximum
Tolerance for peak profile temperature (TP) is defined as a supplier minimum and as a user maximum.
Packaging
Series
Packaging Type
Pieces per Reel
QGS
7" Tape & Reel
800
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0214_QGS • 4/17/2020
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Taping Specification
Dimensions (mm)
Minimum
Typical
Maximum
P0
P
T
P2
W
A0
B0
K0
E
F
D0
3.90
4.00
4.10
7.90
8.00
8.10
0.25
0.30
0.35
1.90
2.00
2.10
11.70
12.00
12.30
3.90
4.00
4.10
5.85
5.95
6.05
1.65
1.75
1.85
1.65
1.75
1.85
5.40
5.50
5.60
1.50
1.50
1.60
Reel Specification
Dimensions (mm)
Tolerance
Nominal
C1
C2
A
B
H
T
D
±1.0
Ø178
±0.2
13.5
±0.2
2.3
±0.2
10.4
±0.5
12.5
±0.2
1.6
±0.5
Ø54
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
Handling Precautions
Pyroelectric Infrared Sensors should be kept away from indirect and direct sunlight, the headlights of cars, wind, and
exposure to strong vibration and strong shock.
Do not use in water, alcohol ETA, corrosive gas or under sea breeze.
Do not be expose to corrosive substances.
Do not drop or apply any mechanical stress.
The performance of this device can be affected by ESD. Precautions should be used when handling and installing the
sensor. Precision devices such as this sensor can be damaged or caused not to meet published specification due to ESD.
Please note that there is limited ESD protection built-in as the device is optimised for low power consumption and low noise
operation. Human Body Model (HBM), per JS-001: 2,000 V.
Pyroelectric Infrared Sensors should be stored in normal working environments.
Solderability will be degraded by exposure to high temperatures, high humidity, corrosive atmospheres, and long-term
storage.
KEMET recommends that ambient storage conditions are < 30°C and < 60% relative humidity and that maximum storage
temperature does not exceed 110°C. Atmospheres should be free of chlorine and sulfur-bearing compounds.
Temperature fluctuations should be minimized to avoid condensation on the parts.
For optimized solderability sensors stock should be used promptly, preferably within 24 months of receipt.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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Gas Sensors – QGS Pyroelectric Infrared Gas Sensors, I2C-SMD
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Disclaimer
All product specifi cations, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for
checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given
herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such
applications, but are not intended to constitute – and KEMET specifi cally disclaims – any warranty concerning suitability for a specifi c customer application or use.
The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any
technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no
obligation or liability for the advice given or results obtained.
Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component
failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards
(such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or
property damage.
Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicted or that other
measures may not be required.
When providing KEMET products and technologies contained herein to other countries, the customer must abide by the procedures and provisions stipulated in all
applicable export laws and regulations, including without limitation the International Traffi c in Arms Regulations (ITAR), the US Export Administration Regulations
(EAR) and the Japan Foreign Exchange and Foreign Trade Act.
KEMET is a registered trademark of KEMET Electronics Corporation.
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