WIKA 702.02.100 DELTA-comb

 差压表 带集成工作压力表和微型开关
Differential pressure gauge with switch contacts
Integrated working pressure indication and micro switch Model 702.02.100

   Applications
     For gaseous and liquid media that are not highly viscous or crystallising
     Heating, ventilation, air-conditioning, dust removing technology
     Technical building equipment, filter systems, drinking and service water treatment
     Monitoring and control of pumps in pressure boosting and fire-extinguishing systems

    Debion
    These differential pressure gauges are particularly used for the monitoring and control of differential pressures in filter systems, pumps and pipeline systems in the heating, ventilation and air-conditioning sector, technical building equipment and in the water management industry.
    Apart from the display of the differential pressure, these applications also require, as a rule, the display of the current working pressure. For this reason, a working pressure indication is integrated in the DELTA-comb differential pressure gauge as a standard.
    An additional measuring point for the working pressure indication, involving additional expenses for piping and mounting, is thus no longer required. The white dial of theworking pressure indication distinctly stands out against the blue background of the display of the differential pressure indication, thus enabling a quick and reliable reading of both measurement beters.
    The scale ranges of 0 ... 250 mbar to 0 ... 25 bar are available to meet the requirements of a wide variety of applications.
    With its robust and compact design the differential pressure gauge can even be used under tough industrial ambient conditions.

   Design and operating principle
    Pressures p1 and p2 act on the media chambers j and i, which are separated by an elastic diaphragm (1).
    The differential pressure (Δp = p1 - p2) leads to an axial deflection (measuring travel) of the diaphragm against the measuring range spring (2).
    The deflection, which is proportional to the differential pressure, is transmitted to the movement (4) in the indicating case and to the plungers of the micro switches (5) via a pressure-tight and low friction connecting rod (3).
    Overpressure safety is provided by bl bolsters (6) resting against the elastic diaphragm.
    The adjustment of the switch point is made by the adjustment screws accessible from the front (7). The assistant scales (8) enable a relatively accurate adjustment of the switch points over 270 p ° and indicate the set point that is currently
adjusted.

   Illustration of the principle

   

    Mounting according to affixed symbols j and i,j high pressure, i low pressure