Pressure Measurement & Control


Pressure measurement converter for harsh conditions

December 2019 Pressure Measurement & Control

Kobold’s PNK pressure measurement converter is used for the remote electrical transmission of pressure signals. For use in heavy machinery, engines, shipbuilding and automotive engineering, this robustly constructed unit must work reliably whilst withstanding strong vibrations and widely varying ambient temperatures. Physical size must also be kept as small as possible, so that several of the units can be arranged in confined spaces.

Principle of operation

When subjected to pressure, the Bourdon tube deflects laterally. The degree of deflection is converted into a proportional electrical measurement using a contact-free differential transformer. The integrated amplifier offers an analog current output of 0(4)-20 mA or a voltage of 0-10 V.

The compact PNK unit comprises a pressure measuring element (Bourdon tube), the inductive tapping system and the downstream amplifier. The electrical supply is connected via screwed cable glands. The aluminium alloy casing is saltwater-resistant and is designed for easy access to pressure connections, cable entry points and terminals. Other features include:

Measuring ranges: -1 to 0 bar and 0 to 100 bar.

Measuring accuracy: 1% of full scale.

Pressure: maximum 160 bar; temperature: maximum 80°C.

Process connection: M16 x 1,5 with conical nipple, R1/4 R11/2, 1/2“ NPT.

Material: brass connection, salt-water resistant aluminium casing.


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