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.

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6

Structure and Dimensions:

1 Sensing Element:

the surface of an alumina ceramic tube

which contains an internal heater.

2 Sensor Base:

Alumina ceramic

3 Flame Arrestor:

100 mesh SUS 316 double gauze

m

e

t

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Standard Circuit Conditions:

Pin Connection and Basic Measuring Circuit:

The numbers shown around the sensor symbol in the circuit diagram at the right

correspond with the pin numbers shown in the sensor's structure drawing (

When the sensor is connected as shown in the basic circuit, output across the Load

gas concentration.

Sensor Resistance (Rs) is calculated by

the following formula:

Power dissipation across sensor electrodes (Ps)

is calculated by the following formula:

Standard Test Conditions:

TGS 821 complies with the above electrical characteristics

when the sensor is tested in standard conditions as specified

below:

Test Gas Conditions:

20

°±2°C, 65±5%R.H.

Circuit Conditions:

±0.1V (AC or DC),

±0.05V (AC or DC),

Ω±1%

Preheating period before testing: More than 7 days

Electrical Characteristics:

Basic Measuring Circuit:

REV: 10/04

Rs = (

Ps =

um : mm

19.5

± 0.5

1.0

± 0.05

13.5

+ 0.3

- 0.2

9.5

± 0.3

6

3

4

2

5

1

FIGARO ENGINEERING INC.

1-5-11 Senba-nishi

Mino, Osaka 562-8505

JAPAN

Phone:

(81)-72-728-2561

Fax:

(81)-72-728-0467

email: figaro@figaro.co.jp