GFL-9722 Datasheet, PDF (1/3 Pages) List of Unclassifed Manufacturers – Gas flow sensor

Gas flow sensor
GFL-9722
Features
• Solid State reliability
• Low cost, small size
• Long-term stability (parts of a percent)
• Interchangeability (0.5%)
• Protective polymer coating
• Custom designs on request
Applications
• Flow detection
• Gas-flow measurements
• Flow control
• Absolute temperature measurement
• Fluid detection
Gas flow sensor
Description
The Gas Flow Sensor GFL-9722 is a ceramic based thermal sensor. It consists of two thick-film
heating resistors and a thick-film temperature sensor. Both temperature sensor and heating resis-
tors are laser trimmed which provides a true sensor-to-sensor interchangeability. The sensitive
parts of the sensor are coated with a black polymer, which protects them from harsh environments
like aggressive solvents, corrosive gasses and aggressive vapors.
When the GFL-9722 is heated by the heating resistors, a gas flow passing the sensor will cool it.
Because of this the output resistance will change. External temperature effects can be compensa-
ted using a second, not-heated, sensor connected in a Wheatstone bridge configuration.
Specifications (in air, ambient temperature 20 ^oC, 1 Atm.)
Parameter
typ units notes
Dimensions
Operating temperature
Storage temperature
7.5 x 7.5 mm
-40 to + 70 ^oC
-50 to + 170 ^oC
Heating resistor
Typical heating voltage
Max. heating voltage
50 ± 1 Ω
7V
9V
Temperature sensor
Stability
Sensitivity
Time constant
2000 ± 10
< 0.5
5.5 ± 0.5
3
Ω
%
Ω/ ^oC
sec.
depending on flow and mounting
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24 August 2005
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