Top accuracy from tiny thermistor probes
A
Betatherm product story
Edited by the Engineeringtalk editorial team
Sep 11, 2003
A novel range of thermistor probes combines exceptional miniaturisation with very high accuracy for biomedical and high precision instrumentation applications.
A novel range of thermistor probes combines exceptional miniaturisation with very high accuracy for biomedical and high precision instrumentation applications.
Able to be used in a catheter, for example, the new Betatherm Micro Beta-Chip Probes (MCDs), available from Sequoia, feature an NTC chip in an epoxy filled polymide tube.
This enables the optimum balance between environmental protection and thermal conductivity to be achieved.
Key features of the probes are their high levels of sensor accuracy (typically +/-0.2C from 0 to 70C) combined with fast response of 200ms.
These issues are critical within the instrumentation sector, where temperature sensors are used for applications such as liquid level sensing, air/gas flow monitoring and chemical analysis.
Made possible as a result of advancements in the construction of the thermistor chip, the MCD probes are based on a minimum thermistor bead size of 0.38mm OD (outer diameter) making it one of the smallest precision NTC thermistor packages available today.
Its design allows for the customisation of accuracies and probe constructions to suit a wide range of precision applications.
Accuracies of +/-0.05C are achievable at a single temperature point (example: 37C) while over a broader range +/-0.1C are typical.
Typical dissipation constants of 0.3mW/C at 25C are available across the MCD range.
Betatherm's MCD thermistor probes offer major advantages in biomedical and instrumentation applications.
In the biomedical market where temperature sensors are widely used inside the body to measure or control temperature, assisting in the diagnosis and treatment of various medical conditions ranging from cardiology and oncology to thermography and endovascular cooling.
In such applications, typically administered via a catheter, it is not unusual for sensors to be employed in tubing as narrow as 0.020in.
Within the instrumentation sector, temperature sensors are required for applications such as liquid level sensing, air/gas flow monitoring and chemical analysis.
In such cases, where minute changes need to be detected, high levels of sensor accuracy (typically +/-0.2C from 0 to 70C) and fast time responses are of benefit.
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