What is the accuracy class of the ultrasonic water meter?

The accuracy classes of ultrasonic water meters are divided into Class 1 and Class 2.

1. For Class 1 water meters (only applicable to water meters with Q3​≥100 m3/h), within the water temperature range of 0.1∘C to 30∘C, the maximum allowable error of the water meter in the high flow zone (Q2​≤Q≤Q4​) is ±1%; and in the low flow zone (Q1​≤Q<Q2​) is ±3%. When the water temperature exceeds 30∘C, the maximum allowable error of the water meter in the high flow zone is ±2%; and in the low flow zone, it remains ±3%.
2. For Class 2 water meters (applicable to water meters with Q3​<100 m3/h, and also applicable to water meters with Q3​≥100 m3/h), within the water temperature range of 0.1∘C to 30∘C, the maximum allowable error of the water meter in the high flow zone (Q2​≤Q≤Q4​) is ±2%; and in the low flow zone (Q1​≤Q<Q2​) is ±5%. When the water temperature exceeds 30∘C, the maximum allowable error of the water meter in the high flow zone is ±3%; and in the low flow zone, it remains ±5%.