El positivo y el negativo del termopar se pueden identificar por el color del aislamiento del cable; existen diferentes estándares de códigos de color para los cables de extensión del termopar en todo el mundo.

The problem of short circuit for mineral insulated thermocouple cable can happen due to several reasons that will effect the test accuracy and damage equipment ,we need to find out the causes and try to solve the issues, here are the mainly list: 1. Manufacturing defects: During the producing of mineral insulated cable, there maybe have defects, such as material impurities, internal wire contact, insulation inconsistencies. Usually the IR(Insulation Resistance) test will be done after mineral insulated cable drawn that will avoid short circuit basically, However especially for long lengths(≥200mtrs) mineral insulated thermocouple cable, the looping frequency may cause the magnesium oxide powder to loosen somewhere relative to the coordinate point resulting the short circuit issue of internal wire contact, we usually do the IR test twice even more. 2. Insulation issue: Due to excessive bent, abrasion, physical damage, or exposure to corrosive substances, the insulation of mineral insulated thermocouple cable will be damaged. If find out the sheath of cable be cut,pinch,worn,punctured, you need to replace the cable immediately. If find out the wire is broken, you need to replace the cable immediately. 3. Installation mistakes:  Improper installation or termination of mineral insulated cable can cause short circuits, such as incorrect wiring connections, inadequate insulation stripping and loose connections. You should follow our installation guidelines and follow industry standards, rich installation experiences can be very helpful to avoid installation short circuits problems. We advise to follow these steps when you need to solve the problems of short circuit for mineral insulated cable: Step1, Stop using cables to stay safe; Step2: Check the cable sheath for physical faults; Step3: Check the thermocouple conductors and its insulation to make sure there are no shorts; Step4: Check the installation errors, such as incorrect connections,inadequate insulation stripping; Step5: Replace the cable; Step6: Test and verify to make sure the problem is solved and the mineral insulated cable can work normally.

The problem of accuracy deviations between suppliers and customers on the same batch of mineral insulated thermocouple cables can occur due to various reasons. Here are some potential causes and suggestions to address this issue:   1.Calibration discrepancies: Suppliers and customers may use different calibration methods or equipment, leading to variations in the measured accuracy. It is essential to ensure that both parties follow standardized calibration procedures and use traceable calibration equipment to minimize deviations. Regular calibration checks and traceability to national or international standards can help maintain consistency.   2.Measurement equipment differences: Suppliers and customers may use different types or models of measurement equipment, which can have variations in accuracy and calibration. It is crucial to specify the required measurement equipment and ensure both parties use the same or equivalent instruments to achieve consistent results. This includes considering factors such as measurement resolution, measurement uncertainty, and calibration traceability.   3.Environmental conditions: Different environmental conditions during testing can affect the accuracy of thermocouple measurements. Factors such as temperature, humidity, and electromagnetic interference can introduce deviations. It is important to establish and agree upon standardized environmental conditions for testing to minimize variations. Specifications for temperature stabilization, shielding, and adequate grounding can help reduce environmental influences.   4.Manufacturing process variations: Even within the same batch of mineral insulated thermocouple cables, there can be minor manufacturing process variations that affect accuracy. Factors such as powder compaction, insulation thickness, and wire alignment can contribute to measurement discrepancies. Regular quality control checks and adherence to manufacturing standards can help minimize process variations.   To address accuracy deviations, it is recommended for suppliers and customers to collaborate closely and establish clear communication channels. This includes sharing calibration certificates, measurement protocols, and any relevant documentation to ensure transparency and alignment. Consider conducting joint testing or interlaboratory comparisons to identify and rectify any discrepancies.The two parties conduct multiple data comparisons to find out the differences in their test data and reduce the relative accuracy difference.