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What Is a Flow Meter Key Specification Parameters

When you look at flow meters, these are the important spec parameters to check:

• Flow Rate Range: Minimum and maximum flow that the meter can measure (e.g., in L/min, m/h, kg/h).

• Accuracy / Error: How close the measured flow is to the actual flow.

• Repeatability: The ability to give the same reading on repeated measurements under the same conditions.

• Turndown Ratio / Rangeability: Ratio of maximum flow to minimum flow measurable with acceptable accuracy. Wikipedia

• Pressure Drop: How much pressure is lost across the flow meter important for process design.

• Operating Pressure: Maximum pressure the meter can handle.

• Operating Temperature: The temperature range of the fluid that the meter can work with.

• Wetted Materials: What materials inside the meter come in contact with the fluid (e.g., SS304, SS316, Hastelloy) matters for corrosion, cleanliness.

• Output / Signal Type:

  • Analog (like 420 mA)

  • Digital (Modbus, HART, RS485)

  • Pulse / Frequency output

  • Status / Alert outputs

• Power Supply: Voltage, power consumption.

• Installation Type: In-line, insertion, clamp-on, flange size.

• Protection / IP Rating: E.g., IP65, IP67 for resistance to dust / water.

• Certifications: (If relevant) Explosion-proof ratings, safety certifications, industry standards.

• Additional Measurements: Some flow meters also measure density, temperature, pressure, or mass flow (not just volume).