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Extension wires0 pages
Dalian Bocon Science & Technology Co., Ltd
Address
No.782, Huangpu Road, Hi-Tech Zone, Dalian, China
116023
Tel:86-411-84793453,84793775 Fax:86-411-84821017,84799763
Web:www.bocondalian.com
Extension wires
Applications
Extension wires are a pair of insulated wires with protecting sheath, which have the same or similar thermoelectric
property as that of the thermocouple they are connected to in certain temperature range. They transfer the reference
junction of the thermocouple to the other end of the wires, usually to an instrument, to form a measurement
system.
Classification
Classified by composition: C (compensating extension wires) and X (extension wires);
Classified by tolerance: standard and S (special);
Classified by working temperature: G (general) and H (heat-resisting);
Classified by application condition: BC (general purpose), BCR (soft cable), BCP (shield cable) and BCRP
(soft shield cable);
Shield cable may be divided into electric shield and magnetic shield. Electric shield cable includes high
frequency shield and intermediate frequency shield cable.
Working temperature range and tolerance (Quoted from ASTM standard)
Note: B. Proprietary alloy compensating extension wire is available for use over a wide temperature range.
C. Special compensating extension wires are not necessary with Type B over the limited temperature range
of 0~50℃ (32~125℉), where the use of Cu/Cu conductors introduces no significant error. For a somewhat
large temperature gradient of 0~100℃ (32~210℉) across the extension portion of the circuit, the use of
Cu/Cu extension wires may result in small errors, the magnitude of which will not exceed the tolerance values
given in the table above for measurements above 1000℃ (1800℉).
