Test & Measurement


Intrinsically safe CTs

27 April 2011 Test & Measurement

Ohio Semitronics announced the new ISC family of intrinsically safe current sensors. They are certified to meet the requirements of ATEX Directive 94/9/EC and UL/CUL intrinsic safety regulations and are designed for use in CUL/UL Class 1, Div 1, Groups A,B,C & D environments as well as Cenelec EEx ia IIC T4 areas. When used with appropriate safety barriers, these units are suitable for installation in hazardous locations commonly associated with oil/gas well logging operations, chemical/petrochemical plants, underground mining and grain processing/storage facilities.

The current transducers (CTs) utilise a Hall-effect sensor with an integrated signal conditioner. All units are packaged in a split-core configuration for ease of installation and removal. Eleven models support input current ranges from 0 to 100 A to a maximum of 0 to 2500 A with output signal options of 0–2,9 V d.c., 0–5 V d.c., 0–10 V d.c. and 4–20 mA providing users with a wide range of industrial applications. 1000 A units with 4–20 mA or 0–2,9 V d.c. outputs are also available. The CTs exhibit accuracy and linearity of ±2%, a response time of 1 millisecond and a frequency response of DC–1 kHz.



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