Thermocouple compensation cable

Thermocouple extension Cable Type K KX/ETFE/Copper braided shield OS/ETFE NICKEL- CHROMIUM/NICKEL AL

Thermocouple extension Cable
Product description: Within a certain temperature range (including normal temperature), one or more pairs of wires with insulation layers have the same nominal value as the thermoelectromotive force of the matching Thermo
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Within a certain temperature range (including normal temperature), one or more pairs of wires with insulation layers have the same nominal value as the thermoelectromotive force of the matching Thermocouple extension Cable Type K KX/ETFE/Copper braided shield OS/ETFE NICKEL- CHROMIUM/NICKEL AL. Use them to connect the thermocouple and the measuring device to compensate Errors caused by temperature changes at their junctions with thermocouples. This article introduces high-temperature compensation wires insulated and sheathed using F40 ETFE material, which is suitable for occasions with on-site temperature resistance requirements,Single Pair-1.5 sq.mm ETFE Thermocouple extension Cable Type K.

Thermocouple extension Cable Type K KX/ETFE/Copper braided shield OS/ETFE NICKEL- CHROMIUM/NICKEL AL Technical Requirements:

1,Conductor：solid alloy, single pair-0.75 mm2 , in accordance with iec 60584.positive:Nickel- chromium ,negative:Nickel.
2,Insulation: ETFE,
3,Assembly: the pairs shall be cabled together with flame retardant polypropylene fillers, as necessary, and polyester tape or spunbond tape to make the finished cable assembly round.
4,Screen: copper braid (min 0.1 mm wire diameter). min 80% coverage.
5,Oversheath:sunlight-resistant, etfe, operating temperature up to 155°c, short term up to 180°c.
6,Print legend: a durable marking shall be provided on the surface of the cable at intervals not exceeding one meter. marking shall include manufacturer’s name, voltage rating (v), insulating material, sheath material, conductor size in mm2, number of pairs, day/month/year of mfg, and sequential footage markings, and type KX.
7,Factory tests: insulated conductors and assembly jacket shall meet the requirements of bs 7655 and bs en 50363-3. in addition, cable shall meet the requirements of iec 60584 and completed cable shall be flame retardant to IEC 60332-3-24 category C.
Thermocouple extension Cable Type K KX/ETFE/Copper braided shield OS/ETFE NICKEL- CHROMIUM/NICKEL AL precautions
1. Selection of compensation wires
The compensation wire must be selected correctly according to the type of thermocouple used and the occasion used. For example, a K-type couple should choose the compensation wire of a K-type couple, and select the operating temperature range according to the usage situation. Usually the kx operating temperature is -20~100℃, and the wide range is -25~200℃. The error of ordinary grade is ±2.5℃, and that of precision grade is ±1.5℃.
2. Contact connection
Keep the two contacts as close as possible to the thermocouple terminal, and try to keep the temperatures of the two contacts consistent. The temperature should be as consistent as possible at the connection point with the instrument terminal. Where there is a fan in the instrument cabinet, the contact point should be protected so that the fan does not blow directly onto the contact point.
3. Use length
Because the signal of the thermocouple is very low, at the microvolt level, if the distance used is too long, the attenuation of the signal coupled with the interference of strong electricity in the environment can distort the signal of the thermocouple, resulting in inaccurate temperature measurement and control. Temperature fluctuations will occur when the control is severe. According to our experience, it is usually better to control the length of the thermocouple compensation wire within 15 meters. If it exceeds 15 meters, it is recommended to use a temperature transmitter to transmit signals. The temperature transmitter converts the potential value corresponding to the temperature into a DC current for transmission, and has strong anti-interference.
4. Wiring
The compensation wire must be routed away from power lines and interference sources. Where crossing is unavoidable, cross paths should be used as much as possible instead of parallel paths.
5. Shielded compensation wire
In order to improve the interference resistance of the thermocouple connecting wire, shielded compensation wires can be used. For occasions with many on-site interference sources, the effect is better. However, the shielding layer must be strictly grounded, otherwise the shielding layer will not only fail to function as a shield, but will instead enhance interference.

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