Datasheet

PRODUCT INFORMATION
PRODUCT INFORMATION
Item
Symbol
Condition
Specification
Sensor Resistance Rs Ethanol at 300ppm/air 1kΩ ~ 10kΩ
Change Ratio of
Sensor Resistance
Rs/Ro
Rs(Ethanol at 300ppm/air)
Rs(Ethanol at 50ppm/air)
0.40 ± 0.10
Heater Resistance RH Room temperature
38.0 ± 3.0Ω
Heater Power
Consumption
P H V H =5.0V 660mW (typical)
Structure and Dimensions:
1 Sensing Element:
SnO2 is sintered to form a thick film on
the surface of an alumina ceramic tube
which contains an internal heater.
2 Cap:
Nylon 66
3 Sensor Base:
Nylon 66
4 Flame Arrestor:
100 mesh SUS 316 double gauze
Item
Symbol
Rated Values
Remarks
Heater Voltage VH 5.0±0.2V AC or DC
Circuit Voltage VC Max. 24V
DC only
Ps≤15mW
Load Resistance RL Variable 0.45kΩ min.
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 (above).
When the sensor is connected as shown in the basic circuit, output across the Load
Resistor (VRL) increases as the sensor's resistance (Rs) decreases, depending on
gas concentration.
Sensor Resistance (Rs) is calculated by
the following formula:
Power dissipation across sensor electrodes (Ps)
is calculated by the following formula:
Electrical Characteristics:
Basic Measuring Circuit:
REV: 09/02
Standard Test Conditions:
TGS 822 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: VC = 10.0±0.1V (AC or DC),
VH = 5.0±0.05V (AC or DC),
RL = 10.0kΩ±1%
Preheating period before testing: More than 7 days
FIGARO USA, INC.
121 S. Wilke Rd. Suite 300
Arlington Heights, IL 60005
Phone: [phone]
Fax: [phone]
email: figarousa@figarosensor.com
For information on warranty, please refer to Standard Terms and
Conditions of Sale of Figaro USA Inc.
Rs = ( -1) x RL
VC
VRL
Ps =
VC
2
x Rs
(Rs + RL)
2
17 ± 0.5
9.5
16.5±0.5
6.5±0.5
1.0±0.5
6
3
4
2
5
1
45˚
45˚
um : mm