The accuracy classes of ultrasonic heat meters are divided into Class 1, Class 2, and Class 3. Class 1 has the highest accuracy, while Class 3 has the lowest.
According to the standard CJ 128 – 2007 “Heat Meters”, the measurement accuracy of a heat meter is determined by the arithmetic sum of the maximum errors of three aspects: the accuracy of the calculator, the accuracy of the paired temperature sensors, and the accuracy of the flow sensor. The specific calculation formulas are as follows:
- Class 1 meter: E=±(2+4Δt/tmin+0.01qp/q)
- Class 2 meter: E=±(3+4Δt/tmin+0.02qp/q)
- Class 3 meter: E=±(4+4Δt/tmin+0.05qp/q)
Among them, Δtmin is the minimum temperature difference (K), Δt is the temperature difference within the operating range (K), qp is the normal flow rate (m3/h), and q is the flow rate within the operating range (m3/h).
Post time: Apr-01-2025