Differential Pressure Gauge
with 2 Bourdon tubes for measuring two different pressures. The instruments consist of two independently working bourdon tubes. Each system has its own pressure connection. The connections are made with +for the higher and -for the lower pressure. The scale on the turnable is splitted in two halfs, each over 50% of the full scale value. The black pointer is for the + connection and the red pointer for the - connection. It allows the direct reading of the (plus or minus) differential pressure. The max. pressure inside of the system may not raise higher than to full scale value. The pressure gauges can be used on normal services up to the full scale value, but they are not overrange protected. Differential pressure should not fall below 20% of the full scale value.
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