All Watts Flow Measurement Devices of this type are supplied with a permanent metal flow characteristic curve which should be affixed to one of the pressure taps on the device using the chain, also supplied.

• 这种类型的所有美国瓦茨流量测量装置还配置永久性金属流量特性曲线，记录在压力标签上，用链条附加在装置上。