WIKA 702.02.100 DELTA-comb

 差壓表 帶集成工作壓力表和微型開關
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

   Special features
     Differential pressure measuring ranges from 0 … 250 mbar to 0 ... 25 bar
     High working pressure （static pressure） up to 25 bar
     One or two adjustable micro switches
     High repeatability of the switch points

    Description
    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 parameters.
    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 metal 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

   Mounting by means of:
     rigid tailpipe  or wall mounting with available mounting links

   

   Options
     Media chamber GD-AlSi 12 （Cu） HART-COAT-surface protection
     Media chamber of stainless steel （without working pressure indication）
     Accuracy class 1.6 for differential pressure indication with factory-set switch points for scale ranges from 0 ... 1 bar to 0 ... 25 bar （switching direction to be specified）
     Ingress protection lP 65
     Integrated pressure equalising valve（stainless steel and FPM/FKM）

     4-way valve manifold of Cu-alloy or stainless steel,（1x pressure equalising valve, 2x pressure gauge valve,1x valve for purging and ventilating）
     Other threaded process connections female and male
     Compression fittings with ferrule or clamp ring for pipe diameters 6, 8 and 10 mm
     Panel mounting flange
     Electrical connection via cable terminal box M20 x 1.5 or L-connector

   

   Dimensions in mm

   



    Ordering information
    Model / Scale range / Process connection / Material of media chamber / Material of separating diaphragm and sealings /Accuracy class for differential pressure indication / Options

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