The technical parameters of a flowmeter primarily serve to characterize its measurement capabilities, scope of application, and operational performance; they constitute a crucial basis for both model selection and practical implementation. Common parameters typically encompass the following aspects:
First are the basic measurement parameters, which include the measurement range, turndown ratio, and accuracy class. The measurement range defines the specific interval-from the minimum to the maximum flow rate-within which the flowmeter can operate normally. The turndown ratio reflects the device's ability to maintain accurate measurements across varying flow conditions. The accuracy class-typically expressed as ±0.5%, ±1.0%, etc.-serves as a key metric for quantifying measurement error.
Next are the operating environment and medium parameters, comprising the applicable medium type, temperature range, and pressure rating. Different flowmeters impose varying requirements on the medium; for instance, electromagnetic flowmeters are suitable for conductive liquids, whereas ultrasonic flowmeters offer a broader scope of application. Temperature and pressure parameters determine the device's capacity to withstand and function effectively under high-temperature and high-pressure operating conditions.
Finally, there are the electrical and output parameters, including supply voltage, power consumption, and output signal type. Common output methods include 4–20 mA analog signals, pulse signals, and RS485/Modbus digital communication. Additionally, some flowmeters specify ingress protection (IP) ratings (e.g., IP65, IP67) and installation requirements to ensure the device's reliable operation within complex environments.
