Structure and Dimensions:

Basic Measuring Circuit:

REV: 09/06

The TGS6812 is comprised of

two

elements: 1) element (D) which is

sensitive to combustible gases and 2) a

reference element (C) which is not

sensitive to combustible gases. These

elements are installed into a "Wheastone

Bridge". A variable resistor should be

adjusted so that the bridge will produce

a stable baseline signal when in an

environmnet free of combustible gases.

When combustible gases are present,

they will be combusted on the detecting

element, causing its temperature to rise.

Accordingly the resistance of this

element will increase. This results in an

"out-of-balance" signal across the

bridge and a corresponding change in

output voltage which can be measured.

Specifications

r

e

b

m

u

n

l

e

d

o

M2

1

8

6

S

G

T

e

p

y

t

t

n

e

m

e

l

e

g

n

i

s

n

e

Sc

i

t

y

l

a

t

a

C

s

e

s

a

g

t

e

g

r

a

Te

n

a

t

u

b

-

o

s

i

,

e

n

a

h

t

e

m

,

n

e

g

o

r

d

y

H

e

g

n

a

r

n

o

i

t

c

e

t

e

d

l

a

c

i

p

y

Ts

a

g

h

c

a

e

f

o

L

E

L

%

0

0

1

~

0

t

i

u

c

r

i

c

d

r

a

d

n

a

t

S

s

n

o

i

t

i

d

n

o

c

e

g

a

t

l

o

V

g

n

i

t

a

r

e

p

O0

.

3