Glass fiber thermocouples are the most commonly used matching accessories for wireless furnace temperature testers, widely used in various medium and low temperature industrial furnace testing scenarios due to their soft structure, good high-temperature resistance and low cost. However, the structural characteristics of glass fiber protective sleeves determine that irregular plugging and pulling operations are easy to cause equipment failure. Unstandardized pulling will lead to loose protective sleeves, exposed wire cores and short-circuit faults, which are common hidden problems in overseas furnace temperature testing work. Mastering professional plug-and-pull protection skills is crucial to maintain the stable performance of glass fiber thermocouples.
The core specification of thermocouple plugging and pulling is to hold the male plug for force application instead of pulling the wire body. The connection between the glass fiber thermocouple wire body and the male plug is fixed by crimping and bonding technology. The connecting part has certain tensile resistance, but long-term forced pulling of the wire body will generate continuous tensile force at the joint, resulting in gradual separation and loosening between the protective sleeve and the male plug. With the increase of pulling times, the loosening degree will continue to intensify, eventually causing the protective sleeve to fall off, and the internal fine wire core is completely exposed to the external environment.
Exposed wire cores will bring serious testing faults and safety hazards. The exposed thermocouple wire core is not protected by the glass fiber sleeve, and it is easy to contact external metal equipment, dust and humid air during furnace temperature testing, resulting in short-circuit failure. Short-circuit will cause abnormal thermoelectric signal transmission, distorted test temperature data, disordered furnace temperature curve, unable to provide effective data support for production process detection. In serious cases, instantaneous circuit overload will burn the thermocouple and even affect the safety of wireless testing equipment.
Standard plug-and-pull operation steps can effectively avoid the above faults. When disassembling the thermocouple equipment after the furnace temperature test is completed, the operator needs to firmly hold the plastic or metal shell of the male plug with one hand, keep the force direction parallel to the plugging direction, and pull it out steadily. The whole process does not bear force on the wire body at all, which completely avoids the loosening and falling off of the protective sleeve. When plugging in, align the interface and insert it in place gently, do not shake and twist violently, to ensure tight and stable interface connection.
In overseas user technical training, plug-and-pull standard operation should be emphasized as a key assessment point. Many small faults of thermocouples are accumulated by irregular plugging and pulling for a long time. Standardizing daily operation can effectively reduce the short-circuit failure rate of glass fiber thermocouples, extend equipment service life, ensure the stability of furnace temperature test data, and help overseas users standardize testing processes and reduce maintenance costs.
