Name: TGS2602
SKU: TGS2602
Availability: InStock

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TGS2602

Digital humidity & temperature sensor — specification summary

Overview

The sensing element is comprised of a metal oxide semiconductor layer formed on the alumina substrate of a sensing chip together with an integrated heater. In the presence of detectable gas, sensor conductivity increases depending on gas concentration in the air. A simple electrical circuit can convert the change in conductivity to an output signal which corresponds to the gas concentration.

The TGS 2602 has high sensitivity to low concentrations of odorous gases such as ammonia and H 2 S generated from waste materials in office and home environments. The sensor also has high sensitivity to low concentrations of VOCs such as toluene emitted from wood finishing and construction products. Figaro also offers a microprocessor (FIC02667) which contains special soft- ware for handling the sensor's signal for appliance control applications.

Due to miniaturization of the sensing chip, TGS 2602 requires a heater current of only 42mA and the device is housed in a standard TO-5 package.

The figure below represents typical temperature and humidity dependency characteristics. Again, the Y-axis is indicated as sensor resistance ratio (Rs/Ro), defined as follows: Rs = Sensor resistance in fresh air at various temperatures/humidities Ro = Sensor resistance in fresh air at 20 ° C and 65% R.H.

The figure below represents typical sensitivity characteristics, all data having been gathered at standard test conditions (see reverse side of this sheet). The Y-axis is indicated as sensor resistance ratio (Rs/Ro) which is defined as follows: Rs = Sensor resistance in displayed gases at various concentrations Ro = Sensor resistance in fresh air

Temperature/Humidity Dependency: Sensitivity Characteristics:

Sensor Resistance Ratio (Rs/Ro)

Hydrogen Air

Ammonia

Hydrogen sulfide

Ethanol

Toluene

Basic Measuring Circuit:

ø9.2 ± 0.2

ø0.5 x 6

e g a tlo v r e t a e H V H 0 . 5 ± C A / C D V 2 . 0

ø8.1 ± 0.2

e c n a tsis e r d a o L R L elb air a V k 5 4 . 0 Ω . ni m

e c n a tsis e r r e t a e H R H 9 5 .x o r p p a Ω . p m e t m o o r t a

Side view

t n e rr u c r e t a e H I H 6 5 ± A m 5

Bottom view

s n oitid n o c s a g ts e T ria la m r o n 0 2 t a ± 5 6 , C ˚ 2 ± H R % 5

ts e t d r a d n a t S s n oitid n o c

s n oitid n o c tiu c ri C V C 0 . 5 = ± C D V 1 0 . 0 V H 0 . 5 = ± C D V 5 0 . 0

ø5.1

d oir e p g nin oitid n o C ts e t e r o f e b s y a d 7

Pin connection: 1: Heater 2: Sensor electrode (-) 3: Sensor electrode (+) 4: Heater

The value of power consumption (P S ) can be calculated by utilizing the following formula:

Sensor resistance (Rs) is calculated with a measured value of Vout by using the following formula:

* High sensitivity to VOCs and odorous gases * Low power consumption * High sensitivity to gaseous air contaminants * Long life * Uses simple electrical circuit * Small size
The TGS 2602	has high sensitivity to low concentrations of odorous gases such
as ammonia and H	2 S generated from waste materials in office and home

* Air cleaners * Ventilation control * Air quality monitors * VOC monitors * Odor monitors
0.1	1	10	100	0	10	20	30	40	50	60
	Gas concentration (ppm)					Ambient temperature (˚C)

40% R.H. 65% R.H. 85% R.H.
heater voltage (V	H ) and circuit voltage		A common power supply circuit can be
(V C ). The heater voltage (V		H ) is applied	used for both V	and V	to fulfill the

Specifications:
maintain the sensing element at a		value of the load resistor (R
specific temperature which is optimal		chosen to optimize the alarm threshold
for sensing. Circuit voltage (V	C ) is	value, keeping power consumption (P	S )
applied to allow measurement of voltage		of the semiconductor below a limit of
(Vout) across a load resistor (R	) which	15mW. Power consumption (P	) will

Structure and Dimensions:
M o d le n u m b e r	T G S 2 6 0 2 - B 0 0	0.9 0.9
S e n nis g ele m e n t yt p e	D 1		Top view
S t a n d a r d p a c k a g e	T O - 5 m e t la c a n		1.6

R S = - R L
T a r g e t g a s e s	A ri c o n t a m ni a n st
T y cip la d e t e oitc n r a n g e	1 ~ 3 0 p p m o f E t O H

C ri c tiu v tlo a g e	V 5 . 0 0 . 2 V D C	P s 1 5 m W
	C ±	≤	element

E el cirtc la
c h a r a tc e citsir s	H e a t e r p o w e r

S e n s o r r e tsis a n c e R s	1 0 k ~ 1 0 0 k Ω ni ria
S e n ytivitis	R s ( 1 0 p p m o f E t O H )	3.6 ± 0.1
	0 . 1 5 ~ 0 . 5
( c h a n g e r a oit o f R s )	R s ( )ria

(V C - Vout)	V C x R L
P S =	R S = - R L
R S	Vout