a drain wire in contact with the aluminum foil carries the interference to the ground. The most effective means of isolating static noise is to have the instrument circuit enclosed within a 100% coverage shield such as an aluminum backed mylar tape. The source of these electric fields may be power lines or other voltage sources mentioned below. Noise Sheilding Wire for Electromagnetic and Electrostatic Noise ShieldingĮlectromagnetic Noise is produced due to capacitive coupling of an electric field within the plant to the instrument circuit. ANSI Standard C96.1-1975, or latest version, is the applicable standard for wires listed in this catalog unless otherwise noted. *The American National Standards Institute (ANSI) designations have replaced the previous Instrument Society of America (ISA) designations for thermocouple materials. All equipment used in the certification is traceable tot he National Bureau of Standards. Certification temperatures available are -320☏, -110☏, 32☏, and 2000☏ and must be specified by the customer. Each coil or spool of wire so certified is marked and a “Certificate of Calibration” is furnished. Thermo Sensors provides a calibration service for customers who require known deviations from specified temperature points. Many of the wires are available with special limits of error and must be specified when ordering. Unless otherwise specified, all wire will be furnished to standard limits of error. Tables on this page show the limits of error for both thermocouple and extension grade wires. Careful attention is given to the proper selection and matching of conductors to ensure conformance to standard limits of error as defined in ANSI C96.1*. Thermo Sensors’ thermocouple and extension wires are known for their quality performance and reliability. Product and Ordering Information Limits of Error ANSI Limits of Error
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March 2023
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