Datasheet

Revised 08/12
13
TECHNICAL INFORMATION FOR TGS3870
Figaro USA Inc. and the manufacturer, Figaro
Engineering Inc. (together referred to as Figaro)
reserve the right to make changes without notice to
any products herein to improve reliability, functioning
or design. Information contained in this document is
believed to be reliable. However, Figaro does not
assume any liability arising out of the application or
use of any product or circuit described herein; neither
does it convey any license under its patent rights, nor
the rights of others.
Figaro’s products are not authorized for use as critical
components in life support applications wherein a
failure or malfunction of the products may result in
injury or threat to life.
FIGARO GROUP
HEAD OFFICE
Figaro Engineering Inc.
1-5-11 Senba-nishi
Mino, Osaka 562-8505 JAPAN
Tel.: [phone]
Fax: [phone]
email: garo@garo.co.jp
www.garo.co.jp
OVERSEAS
Figaro USA Inc.
121 S. Wilke Rd. Suite 300
Arlington Heights, IL 60005
Tel.: [phone]
Fax.: [phone]
email: garousa@garosensor.com
content atmosphere.
8) Polarization
The sensor has polarity. An incorrect Vc connection
may cause significant detrioration of long term
stability. Connect Vc according to specications.
9) Soldering
Sensors should be manually soldered--wave soldering
is not recommended. The high heat generated during
wave soldering may deform the resin parts and
damage the sensor (e.g. the pressure-tted sensor
cap may separate from the base). For sensors with a
lter cap (such as TGS3870), deformation may create
a gap between the sensor cap and base, alllowing
interference gases to bypass the lter.
4-2 Situations to be avoided whenever possible
1) Water condensation
Light condensation under conditions of indoor usage
should not pose a problem for sensor performance.
However, if water condenses on the sensor’s
surface and remains for an extended period, sensor
characteristics may drift.
2) Usage in high density of gas
Sensor performance may be affected if exposed
to a high density of gas for a long period of time,
regardless of the powering condition.
3) Storage for extended periods
When stored without powering for a long period,
the sensor may show a reversible drift in resistance
according to the environment in which it was
stored. The sensor should be stored in a sealed bag
containing clean air; do not use silica gel. Note that
as unpowered storage becomes longer, a longer preheating
period is required to stabilize the sensor before usage.
4) Long term exposure in adverse environment
Regardless of powering condition, if the sensor
is exposed in extreme conditions such as very
high humidity, extreme temperatures, or high
contamination levels for a long period of time, sensor
performance will be adversely affected.
5) Vibration
Excessive vibration may cause the sensor or lead
wires to resonate and break. Usage of compressed
air drivers/ultrasonic welders on assembly lines may
generate such vibration, so please check this matter.
6) Shock
Breakage of lead wires may occur if the sensor is
subjected to a strong shock.