Possible areas of application

SIKA differential pressure gauges with two bourdon tubes are instruments for measuring two different pressures and indication of the differential pressure. They are used in heating systems (supply and return lines) and filter systems.

Description

Differential pressure gauges should be selected with a fullscale value that is at least as large as the maximum pressure occurring in the system. The pressure gauges can be operated at pressures up to the maximum scale pressure, but they cannot withstand overpressure. To ensure good readability of the differential pressure, the differential pressure should not be less than about 20% of the full scale value. If the differential pressure is significantly lower, other types of devices, such as diaphragm pressure gauges or models with two bourdon tubes and a single pointer, are more suitable.

Construction
The instruments are provided with two independently working measuring systems, each system with its own pressure connection. The connections are marked with + and - (+ for the higher pressure, - for the lower pressure). A special duplex movement with the pointer arbors seated co-axial into each other transfers the pressure proportional motions of both Bourdon tubes to the pointers.

Display ranges
DIN display ranges available from 0…0.6 bar to zu 0…600 bar.

Case type
The stainless steel case is available with a bayonet ring. Case ventilation is provided by a pressure equalisation insert.