pressure variation. (This explains our recommendations for the installations in Section 4). Also, the
meter measurement principle is often very important for the understanding of any discrepancies.
Please note for comparison with a rotameter, the reading could have large deviations due to the
different measurement principles, in particular as rotameter is sensitive to pressure and temperature
variations.
8.2.3. Particle contamination and fluidic cleanness
Any contamination including particles and liquid vapors would be detrimental to the accuracy of the
flow measurement and also to the meter functionality. It is important to ensure the applied flow
medium will be clean and dry. If any contamination is suspected, please allow experienced technical
personnel to have it checked and re-conditioned. Do not use a foreign cleanser or other fluids to
clean the flow path which could bring irrecoverable damage.
8.2.4. Apply to a different gas medium
The product is calibrated with a high precision NIST traceable metrological standard with clean and
dry air. In case the meter will be applied to meter the other clean and dry gas, a correct gas
conversion factor needs to be registered into the meter before the measurement.
The meter operates similarly to the principle described in the international standard for thermal mass
flow meters (ISO 14511:2001 - Measurement of fluid flow in closed conduits — Thermal mass
flowmeters). Due to the meter assembled procedure, the head loss value from the meter to the
meter would not be 100% identical, and at the large dynamic measurement range, the thermal
response would also have some deviations and nonlinearity from gas to gas. Therefore,
measurement by the meter for a gas medium other than the calibration gas would bear larger
measurement errors, particularly at the low Reynold number range where the laminar flow has a
sensitive flow profile.
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