Datasheet

Revised 08/12
3
TECHNICAL INFORMATION FOR TGS3870
0.25 ± 0.05
5.0 ± 0.5
0.8 ± 0.1
2.54 ± 0.2
13.0 ± 0.5
Top View
Side View
Bottom
View
Pin connection:
1: Common(-)
2: Sensor electrode(+)
3: Heater(+)
ø9.2 ± 0.2
ø8.1 ± 0.2
unit:mm
1 2 3
Figure 3 - Dimensions
1-5 Dimensions1-4 Specications
NOTE: Caution should be exercised in the selection of the
load resistor (RL) to ensure that power consumption (Ps)
does not exceed 15mW.
Ps = (VS)
2
/Rs
Ps reaches max. value when: RL = Rs
Sensor resistance (Rs) is calculated with a measured value
of VRS by using the following formula:
Rs = x RL
All sensor characteristics shown in this brochure
represent typical characteristics. Actual
characteristics vary from sensor to sensor and
from production lot to production lot. The only
characteristics warranted are those shown in
the Specication table above.
(VRS - 0.5VH)
(Vc - VRS)
Mechanical Strength:
The sensor shall have no abnormal findings in
its structure and shall satisfy the above electrical
specications after the following performance tests:
Withdrawal Force -
(pin from base)
Vibration -
Shock -
withstand force of 5kg in each
direction
vertical amplitude=1.5mm,
frequency=10~500Hz, duration=
3 hours, direction=x,y,z (all)
acceleration-100G, repeat 5 times
Model number TGS3870
Sensing element type Micro-bead
Standard package Plastic base and metal can
Target gases Methane and Carrbon Monoxide
Typical detection range
Methane 500 ~ 12,500ppm
Carbon monoxide 50~1,000ppm
Standard
circuit
conditions
Heater voltage VH
VHH = 0.9V±3% for 5 sec.
VHL = 0.2V±3% for 15sec.
Circuit voltage VC
5.0±0.2V DC pulse
(refer to Technical Information for TGS3870)
Load resistance RL variable (>0.75kΩ)
Electrical
characteristics
under standard
test conditions
Heater resistance RH 3Ω±0.3Ω at room temp.
Heater power
consumption
PH
120mW VHH = 0.9V DC
11mW VHL = 0.2V DC
38mW average
Sensor resistance RS
0.35kΩ~3.5kΩ in 3000ppm
methane
1.8kΩ~24kΩ in 150ppm CO
Sensitivity
(change ratio
of Rs)
β
0.50~0.65
Rs (3000ppm CH4)
Rs (1000ppm CH4)
0.1~0.6
Rs (300ppm CO)
Rs (150ppm CO)
Standard test
conditions
Test gas conditions
Target gas in air
at 20±2˚C, 65±5%RH
Circuit conditions
VHH = 0.9V±2% for 5 sec.
VHL = 0.2V±2% for 15 sec.
Vc = 5.0±0.02V DC pulse
(refer to Technical Information for TGS3870)
Conditioning period
before test
≥5 days