8. Technical notes for the product performance
8.1 Measurement principles
The products utilize the Company’s proprietary micro-machined
(MEMS) calorimetric sensing and data process technology. A thermal
signal generator with a pair of sensing elements at the up and
downstream of the microheater is precisely manufactured and
separated at predefined micrometer distances on a chip surface with
excellent thermal isolation. When a fluid is flowing through the sensing
chip, the fluid carries the thermal signal downstream. The sensing
elements register the temperature differences, further correlated to
the fluid mass flow rate via the calibration process.
The calorimetric sensing approach offers a large dynamic range with a
better performance against the environmental parameter alternations.
Please refer to the company's US patents and other publications made available to the public for
additional information.
8.2 Precautions for the best performance of the product
8.2.1 Altitude changes
Unlike some other products on market, the design of the sensor has a built-in pressure balancer that
preventing membrane deformation due to altitude changes. Therefore, the sensor is intrinsically
insensitive to the altitude change-induced errors. The specified altitude in Sec 7.1 has been fully
tested.
8.2.2 Excessive humidity or condensation
The humidity change will not alter the performance of the sensor. However, if excessive humidity is
present resulting in condensation, the measurement port or channel could be blocked or altered.
This would result in a very unreliable data output. Please filter or other tools to prevent this situation
to occur when using this product.
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