Model CP4000

Electric alarm contacts

4½" Indicating pressure switches inductive proximity sensor

Selected documents
Sales contact

WIKA USA

Tel.:
1-888-945-2872
Fax:
1-770-338-5118
info@wika.com

Applications

  • Ideally suited for alarm and control functions on hydraulic, pneumatic and general industrial machinery and equipment
  • Process industry installations, including chemical, petrochemical plants, oil refineries, electric power plants, pulp and paper mills and wastewater treatment plants.

Special Features

  • Compact design for minimal space requirement.
  • Corrosion and impact resistant housing.
  • Reduced installation cost due to elimination of pressure manifold and shut off valve needed for separate pressure connection.
  • FM approval for use in hazardous locations with control unit types 904.15, 904.16 or 904.17.
  • High installation flexibility through ability to retrofit WIKA series 41/2" gauges in the field without removal from service.
  • Available with wetted parts of brass, stainless steel or Monel for most process media.
  • Suitable for use with diaphragm seals for corrosive, viscous or high temperature media.

Description

CP 4000 Inductive Proximity Sensors for Use with 4½" Gauges Factory Mutual Approved
The 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.

Electric alarm contacts
  • Electric alarm contacts
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