Full insertion in place and complete locking of stop screws are the basic installation core standards to ensure accurate temperature measurement and stable fixation of sheathed thermocouples. In on-site industrial construction, incomplete probe insertion and loose stop screws are common non-standard operations, which are easy to cause serious problems such as low temperature measurement accuracy, unstable data fluctuation and sensor shaking and displacement. Strictly implementing full insertion and full locking specifications can completely eliminate installation errors and ensure the optimal working state of the thermocouple.
The probe insertion depth directly determines the authenticity of temperature measurement data. The temperature sensing core of the sheathed thermocouple is concentrated at the front end of the probe. If the insertion is not in place and the sensing end fails to reach the preset medium temperature measurement area or pipeline wall detection position, the probe will be in the transition temperature zone with unstable heat conduction. The collected temperature data will be lower or higher than the actual process temperature for a long time, resulting in continuous deviation of process parameters and affecting product forming quality and production stability.
Full insertion in place enables the thermocouple sensing end to fully fit the measured medium and equipment wall surface, realizing zero-distance heat conduction and real-time temperature signal feedback. Only when the probe reaches the standard installation depth can it avoid the interference of ambient temperature and equipment shell temperature, accurately capture the real temperature of the production medium, and ensure that the temperature measurement data is completely consistent with the actual operating temperature of the process system. This is the primary premise to ensure the high precision of sheathed thermocouple temperature measurement.
The stop screw undertakes the core functions of depth positioning, fixed locking and anti-displacement of the thermocouple. After the probe is fully inserted in place, the stop screw must be completely tightened without looseness and virtual locking. Loose stop screws will cause the thermocouple to have movable gaps. Under the action of equipment operation vibration and fluid impact, the sensor will continuously shift and shake, resulting in unstable temperature data, frequent data fluctuation, and even gradual retreat displacement of the probe, completely losing the temperature measurement function.
Full locking of the stop screw can fix the thermocouple at the optimal detection position for a long time, eliminating displacement gaps and vibration interference, ensuring long-term stability of the sensor installation position and consistent temperature measurement benchmark. In the daily acceptance of industrial equipment installation, full insertion and full locking are key inspection items. Standardized locking installation can maximize the service life of sheathed thermocouples, maintain long-term accuracy and stability of temperature measurement, and provide solid guarantee for stable operation of industrial temperature control systems.
