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Inductive Switch Options
Switch Functions & Definitions
Wiring Instructions

Pressure Gauge With Inductive Contacts - 100mm & 160mm (ATEX Option)

Pressure gauges can be supplied with three types of electric alarm contacts: Inductive (Non-Contact) which this data sheet relates to, Electromechanical (Sliding design or Magnetic Snap Action design) and Electronic (Non-Contact).

General Information - Inductive Contacts

Inductive contacts have non-contact electric displacement pickups according to EN 60947-5-6 or NAMUR

The inductive contact consists of 3 main components:

  • An adjustable red setting pointer
  • The carrier arm which is connected to the above red setting pointer which carries the control head with the encapsulated electronics
  • A control flag which is moved by the gauge pointer

The gauge indicating pointer can freely move beyond the selected set point of the electrical contact which remains active allowing accurate measurement still to be made to the full scale of the instrument.

A contact adjustment lock allows the user to adjust the setting pointer to the value at which the unit has to switch.

Inductive Contact – Principle of Operation

Inductive contacts are used in connection with a switching amplifier which supplies the control head with direct voltage. As the control flag mounted on the instrument indicating pointer reaches thecontrol head the internal resistance in the control head increases. This causes the current to change and is used to control the switching amplifier. The amplifier converts the input signal into a binary output signal.

Due to the non-contacting switching function this design of switch offers high switching accuracy and long service life .This design is particularly recommended for applications with a high switching frequency or where high reliability is required. Assuming a suitable isolating switching amplifier is used, this instrument can be used on intrinsically safe applications.

ATEX Option: If a suitable isolating amplifier is used (such as our model KFA6-SR2-Ex) the system will confirm to the following Intrinsically Safe Hazardous Classification and maybe used in hazardous area Zone 1 and 2. Please note however that the isolating switching amplifier must always be installed in the safe area (outside the hazardous area): Ex II 2G EEx ia IIC T6 or Ex II 1G EEx ia IIC T6