Microheater keeps airflows temperate
A
Heraeus Sensor Technology product story
Edited by the Engineeringtalk editorial team
Apr 9, 2002
A small, fast reacting microheater measuring only 9.5 x 1.9mm and suitable for use up to 500C has been launched by Heraeus Sensor-Nite.
A small, fast reacting microheater measuring only 9.5 x 1.9mm and suitable for use up to 500C has been launched by Heraeus Sensor-Nite.
Comprising of a thin film platinum resistive layer with a positive temperature coefficient deposited onto a 0.15mm thick ceramic substrate, the heater is highly stable and resistant to vibration and mechanical shock.
Nominal resistance at 0C is 6.8ohm +/-0.5%.
Depending on the application, reaction times of approximately 10 to 20ms are achievable.
Originally designed for use in airflow meters, the heater can also be used in a variety of direct heating applications in a wide range of industries.
In airflow measurement applications an electronic control system in conjunction with a temperature sensor ensure that the heater is kept at a constant temperature.
If the heater is cooled by the airflow, the heating current has to be increased.
This alteration in the measurement current is a function of the airflow volume.
Typical applications for this type of measuring system include engine intake airflow meters in the automotive industry, measurement of flow rates in HVAC ducting or in breathing apparatus in the medical industry.
Due to its robust construction and compact size the microheater can be used in a wide range of direct heating applications including, frost protection systems and demisting mirrors or optical components.
Because of its low cost it can be considered as a consumable device and is therefore ideally suited for use in analytical equipment particularly in medical and laboratory applications where there is a potential risk of crosscontamination.
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