Measure and record the differential pressure across the valve using a Watts Series PG meter. CAUTION: Safety glasses should be used.
采用美国瓦茨系列PG仪器测量和记录通过阀门的压差。警告：应该使用安全眼镜。
2
As with the four-point collinear probe method, a differential measurement may be required if the sample resistance is of the same magnitude as the isolation (meter common to ground) of the voltmeter.
It is the first time in China that a dual flange differential pressure intelligent meter of us Honeywell Co. make has been used for the measurement of oil water interface.