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Solutions for pressure, temperature, force and level measurement, flow measurement, calibration and SF6 gas solutions from WIKA are an integral component of our customers' business processes.
This is why we consider ourselves to be not just suppliers of measurement components but rather more a competent partner that offers comprehensive solutions in close co-operation with our customers – customised and precisely designed products for the exact requirement.
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4½" Indicating pressure switches inductive proximity sensor
Applications
Special Features
CP 4000 Inductive Proximity Sensors for Use with 4½" Gauges Factory Mutual ApprovedThe WIKA indicating pressure switches combine local pressure indication with alarm and control capabilities into a single economical, reliable and compact system. Superior to conventional gauge and switch connections, WIKA indicating pressure switches are extremely reliable, have low hysteresis, resist corrosion and have easy set point adjustments. Ideally suited for alarm and control functions on hydraulic, pneumatic and general industrial machinery and equipment as well as on process industry installations, including chemical, petrochemical plants, oil refineries, electric power plants, pulp and paper mills and wastewater treatment plants.
CP 4000 Inductive Proximity Sensors <FM> feature one or two non-contact proximity sensors in place of mechanical contacts and provide a higher degree of reliability and operating safety. The system consists of a sensing head, containing two axial coils with an air gap, a metallic control flag and a switching amplifier. The sensing head is carried by the set pointer, while the control flag is coupled to the gauge pointer by a special adaptor. Movement of the control flag in and out of the air gap causes an impedance change in the transistor oscillator circuit formed by the two coils which in turn triggers the switching amplifier. When the flag is inside the slot, circuit impedance is high and the contact relay is de-energized. Conversely, when the flag is outside the slot, the relay is energized. Technical specifications are in Table 1.
Control Units for CP 4000 The switching amplifier and control relay are housed in a separate control unit. Depending on the type of control unit used, inductive proximity sensor systems can be furnished in the following versions: standard, for non-hazardous locations; intrinsically safe for hazardous locations; intrinsically safe with fail-safe circuitry. Control Units are FM approved for use in Division I, Classes I and II, Groups A through G hazardous locations. The control units must be located outside the hazardous area. (See Table 2 on data sheet).
Fail Safe Circuitry The type SN inductive proximity sensor together with control unit Type 904.17 is self monitoring and its function is superimposed on the regular control function. Should any fault occur in the sensing head, the control wiring or the control unit (such as short or open circuit, power failure or component failure), the output relay is automatically de-energized.
Model CP3000
4½" Indicating pressure switches, magnetically assisted contact
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