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PRODUCT INFORMATION

Applications:Features:

TGS 4160 - for the detection of Carbon Dioxide

The gure below represents typical sensitivity characteristicsof TGS4160. The Y-axis is indicated as EMF which is denedas follows:

EMF=EMF1 - EMF2where

EMF1=EMF in 350 ppm CO 2 EMF2=EMF in listed gas concentration

The gure below shows typical humidity dependency for anenergized sensor. Again, the Y-axis is indicated as EMFwhich is dened as follows:

EMF=EMF1 - EMF2where

EMF1=EMF in 350 ppm CO 2 EMF2=EMF in 1000ppm CO 2

* Air quality control* CO 2 control in agricultural applications* CO 2 monitoring

The TGS4160 is a hybrid sensor unit composed of a carbon dioxide sensitiveelement and a thermistor. A wide range of 350~50,000ppm of carbon dioxide canbe detected by TGS4160, making it ideal for usage in a variety of applications.

The CO 2 sensitive element consists of a solid electrolyte formed between twoelectrodes, together with a printed heater (Pt) substrate. By monitoring thechange in electromotive force (EMF) generated between the two electrodes,

it is possible to measure CO 2 gas concentration.Adsorbent (zeolite) is lled between the internal cover and the outer cover forthe purpose of reducing the inuence of interference gases.

TGS4160 exhibits a linear relationship between EMF and CO 2 gas concentrationon a logarithmic scale. The sensor displays good long term stability and showsexcellent durability against the effects of high humidity.

* High selectivity to CO 2* Low dependency on humidity* Long life

Humidity Dependency:Sensitivity Characteristics:

0

50

100

150

100 1000 10000 100000

CO2COEtOH

Gas Concentration (ppm)

220

250

280

310

340

370

400

430

0

10

20

30

40

50

60

70

0 20 40 60 80 100

Relative Humidity (%)

EMF (350ppm CO2)

EMF (350ppm CO2 - 1000ppm CO2)

IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY WITH EACH CUSTOMERS SPECIFIC APPLICATIONS. FIGARO STRONGLYRECOMMENDS CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO SENSORS IN YOUR APPLICATION AND, IN PARTICULAR, WHEN CUSTOMERS TARGETGASES ARE NOT LISTED HEREIN. FIGARO CANNOT ASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR APPLICATION FOR WHICH SENSOR HASNOT BEEN SPECIFICALLY TESTED BY FIGARO.

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Structure and Dimensions:

Basic Measuring Circuit:

REV: 01/06

The TGS4160 sensor requires heatervoltage (V H) input. The heater voltage isapplied to the integrated heater in order

to maintain the sensing element at aspecic temperature which is optimal forsensing. Electromotive force (EMF) ofthe sensor should be measured using ahigh impedance (> 100 G) operationalamplier with bias current < 1pA (e.g.Texas Instruments' model #TLC271).Since the solid electrolyte type sensor

Specications:

FIGARO USA, INC.121 S. Wilke Rd. Suite 300Arlington Heights, IL 60005 USAPhone: (1)-847-832-1701Fax: (1)-847-832-1705email: garousa@garosensor.com

FIGARO ENGINEERING INC.1-5-11 Senba-nishiMino, Osaka 562-8505 JAPANPhone: (81)-72-728-2561Fax: (81)-72-728-0467www.garo.co.jpemail: garo@garo.co.jp

functions as a kind of battery, theEMF value itself would drift using thisbasic measuring circuit. However, thechange of EMF value (EMF) shows a

stable relationship with the change ofCO 2 concentration. Therefore, in orderto obtain an accurate measurementof CO 2, a special microprocessor forsignal processing should be used withTGS4160. Figaro can provide a specialevaluation sensor module (AM-4) forTGS4160.

Sensing Element Structure:

Top view

Bottom view

(u/m = mm)

DF

C

A

Bottom View (Sensor Element)

A: Lead wires

Side view (Sensor Element)

B : Pt Heater

F : Sealing GlassE : Counter Electrode(Anode)

C : Solid Electrolyte

D : Sensing Electrode(Cathode)

For information on warranty, please referto Standard Terms and Conditions of Saleof Figaro USA Inc.

EMFVH

TGS4160

1 3

6 4

IBIAS < typ. 1pA

GND

2

5

Thermistor

Thermistor

Operational amplifier

+

-