Table of Contents
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Revised 08/03
APPLICATION NOTES FOR TGS2611
Application Notes for Methane Gas Detectors using TGS2611
The TGS2611 methane gas sensor
has
been
presorted
groupings which will allow users
to simplify the manufacturing
process
for
methane
detectors. This brochure offers
example application circuits and
important technical advice for
designing and manufacturing gas
detectors which use classified
TGS2611 sensors.
Introduction......................................................................................................2
Basic Circuit with Temperature Compensation............................................2
Selecting a Load Resistor.................................................................................2
Compensation for Internally Generated Heat..............................................3
Heater Breakage Detection Circuit.........................................................3
Sensor Malfunction Detection Circuit.........................................................3
Prevention of Intermittent Alarming..............................................................4
Alarm Prevention during Warmup................................................................4
Alarm Delay Circuit..........................................................................5
Application Circuit...................................................................................5
Handling and Storage of Sensors..........................................................5
Selection...............................................................................................5
PCB Assembly....................................................................................5
Sensor Assembly..................................................................................5
Final Assembly.................................................................................................6
Preheating of Final Assembly.....................................................................6
Gas Test..............................................................................................6
Storage of Finished Products..........................................................................6
Anticipated Performance at 10%LEL of Methane...........................................................6
Pre-calibrated Sensor Module...........................................................................................7
Appendix...............................................................................................................8
See also Technical Brochure 'Technical Information on Usage of TGS
Sensors for Toxic and Explosive Gas Leak Detectors'.
IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED
WILL VARY WITH EACH CUSTOMER'S SPECIFIC APPLICATIONS. FIGARO STRONGLY
RECOMMENDS CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO
SENSORS IN YOUR APPLICATION AND, IN PARTICULAR, WHEN CUSTOMER'S TARGET
GASES ARE NOT LISTED HEREIN. FIGARO CANNOT ASSUME ANY RESPONSIBILITY
FOR ANY USE OF ITS SENSORS IN A PRODUCT OR APPLICATION FOR WHICH SENSOR
HAS NOT BEEN SPECIFICALLY TESTED BY FIGARO.
TGS2611-J00 is a UL recognized component in accordance with the
requirements of UL2075. Please note that component recognition testing
has confirmed long term stability in 60ppm of methane; other characteristics
shown in this brochure have not been confirmed by UL as part of component
recognition.
into
gas
Page
1
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Table of Contents
Related Manuals for Figaro TGS2611
Summary of Contents for Figaro TGS2611
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Page 1: Table Of Contents
FOR ANY USE OF ITS SENSORS IN A PRODUCT OR APPLICATION FOR WHICH SENSOR HAS NOT BEEN SPECIFICALLY TESTED BY FIGARO. TGS2611-J00 is a UL recognized component in accordance with the requirements of UL2075. Please note that component recognition testing has confirmed long term stability in 60ppm of methane;... -
Page 2: Introduction
APPLICATION NOTES FOR TGS2611 To facilitate ease in manufacturing gas detectors, Sensor code both Figaro TGS2611-J00 and TGS2611-B00 methane gas sensors are individually marked with Lot # TGS2611 TGS2611 314AE #07 an ID number (see Figure 1) indicating a factory... -
Page 3: Compensation For Internally Generated Heat
APPLICATION NOTES FOR TGS2611 1-3 Compensation for internally generated heat ∆ ∆ ∆ ∆ ∆ Ω) ˚ ( Depending on the design of the case and the PCB, there is often a difference between the temperature near the thermistor’s placement in the detector and the ambient temperature. -
Page 4: Prevention Of Intermittent Alarming
1-7 Alarm prevention during warm-up As described in Sec. 2-6 of “Technical Information 2.5 min. time delay circuit for TGS2611”, when energizing the sensor after an unpowered period, the sensor’s resistance (Rs) drops sharply for the first few seconds after energizing, regardless of the presence of gases, before recovering to a stable level. -
Page 5: Alarm Delay Circuit
APPLICATION NOTES FOR TGS2611 1-8 Alarm delay circuit 15 sec. time delay circuit To prevent false alarms caused by transient interference gases such as alcohol in cooking vapors, a delay circuit modification such as that shown in Figure 7 can be used. The alarm signal... -
Page 6: Final Assembly
TGS Sensors” should also be observed. 3. Anticipated Performance at 10%LEL of under operating conditions at recommended circuit condition Methane When using the classified TGS2611 with Figaro’s under std test conditions recommended R for 10%LEL (Table 1) and temperature compensated circuit design (Figure... -
Page 7: Pre-Calibrated Sensor Module
Without testing alarm threshold after final assembly, detectors have no accuracy or reliability guarantee. Figaro USA Inc. and the manufacturer, Figaro Figaro's products are not authorized for use as critical Engineering Inc. (together referred to as Figaro) components in life support applications wherein a... -
Page 8: Appendix
APPLICATION NOTES FOR TGS2611 Appendix 1 - Example application circuit for gas detector using classified TGS2611 Revised 08/03...