Manufacturer Customized Heating Cable

1、 Core testing indicators and operating methods   1.Heating rate detection: Verify whether the heating efficiency meets the standard The heating rate directly reflects the power matching degree and heat transfer efficiency of the heating cable, and needs to be tested in a standard environment. Testing premise Turn off other indoor heat sources (such as air conditioning and heating), keep doors and windows closed, and stabilize the initial room temperature at 18 ℃~22 ℃ (simulating daily use environment); Ensure that the heating cable is powered on normally and the temperature controller is set to the target temperature (such as 28 ℃ for ground heating and 50 ℃ for pipeline insulation). operating steps Using high-precision thermometers (accuracy ± 0.1 ℃) or infrared thermometers, select three representative measuring points in the heating area (such as the center of the room, 1m away from the wall, and corners for ground heating); Pipeline insulation should be selected at areas with dense cable winding, in the middle, and at the end; Record the initial temperature (before power on), and record the temperature of each measuring point every 10 minutes after power on until the temperature stabilizes (continuous temperature fluctuation ≤ 0.5 ℃ for 30 minutes); Calculate the time from the initial temperature to the target temperature and compare it with the standard requirements. compliance standard Ground radiation heating scenario: heating time ≤ 1 hour (from 20 ℃ to 28 ℃); Pipeline insulation scenario: The heating time must meet the design requirements (such as from 10 ℃ to 50 ℃, with a time of ≤ 2 hours, subject to the specific design documents); If the heating rate is too slow (such as exceeding 2 hours), it is necessary to check whether the cable power is insufficient, whether the insulation layer is damaged (heat loss), or whether the cable spacing is too large.   2. Temperature uniformity detection: Verify whether the heat distribution is balanced Temperature uniformity should avoid local overheating or insufficient temperature, and cover the entire heating area. Infrared thermography is commonly used for visual detection. Testing premise The heating cable has been running stably for more than 2 hours, ensuring sufficient heat transfer; Ground heating scenarios require the completion of filling layer construction (such as cement mortar layer) to avoid direct detection of cable surfaces (which may cause errors due to local contact). operating steps Ground heating: Use an infrared thermal imaging device (resolution ≥ 320 × 240) to scan the entire heating area, select measurement points according to a 2m × 2m grid, and cover at least 9 measurement points (such as a 3x3 grid, including corners, edges, and centers); Pipeline insulation: Select a measuring point every 1m along the axial direction of the pipeline, measure the temperature at each point in four directions: up, down, left, and right of the pipeline, and record the temperature at each point; Calculate the difference between the highest and lowest temperatures of all measuring points to determine if they meet the standards. compliance standard Ground heating: The temperature difference between all measuring points is ≤ 3 ℃ (such as 28 ℃ in the center and no less than 25 ℃ at the edges); Pipeline insulation: The temperature difference between measuring points on the same section is ≤ 5 ℃, and the temperature difference between adjacent measuring points in the axial direction is ≤ 3 ℃; If the local temperature difference is too large (such as the temperature in the corner being 5 ℃ lower than the center), it is necessary to check whether the cable spacing is uneven (locally too sparse), whether there are gaps in the insulation layer (heat loss), or whether the thickness of the pipeline insulation layer is insufficient.   3. Temperature control accuracy testing: Verify the linkage effect between the temperature controller and the cable The temperature control accuracy ensures that the system can stably maintain the set temperature, avoiding frequent start stop or temperature drift. Testing premise The temperature controller has completed parameter settings (such as setting a temperature of 28 ℃ with a return difference of 1 ℃), and it is linked normally with the heating cable; Use third-party high-precision temperature measuring equipment (such as platinum resistance thermometers with an accuracy of ± 0.1 ℃) to avoid relying on the built-in display of the thermostat (which may have errors). operating steps Fix the high-precision thermometer probe in the center of the heating area (ground heating buried in the filling layer, pipeline insulation attached to the surface of the pipeline), with a distance of ≥ 50cm from the temperature controller sensor (to avoid mutual interference); Record the temperature displayed by the thermostat and the actual temperature measured by a third-party device, monitor continuously for 4 hours, and record data every 30 minutes; Calculate the difference between the displayed temperature and the measured temperature for each record, and calculate the maximum error. compliance standard Temperature control accuracy error ≤ ± 1 ℃ (if the thermostat displays 28 ℃, the measured temperature should be between 27 ℃ and 29 ℃); If the error exceeds ± 2 ℃, the temperature controller sensor needs to be calibrated (such as repositioning the probe), or the signal connection between the temperature controller and the cable needs to be checked (such as poor contact of the control line).     2、 Auxiliary detection: eliminate hidden problems   1. No local overheating detection Purpose: To avoid local overheating caused by cable overlap or damage (leading to insulation failure); Operation: Use an infrared thermal imaging device to scan the cable laying area, focusing on cable joints, bends, and overlapping hidden dangers (such as the corners of ground heating); Standard: The local maximum temperature shall not exceed 80% of the rated temperature resistance of the cable (such as a cable with a temperature resistance of 120 ℃, the local maximum temperature ≤ 96 ℃), and shall not exceed the safe temperature of the heating object (such as the maximum temperature of the pipeline medium+10 ℃). 2. Power off cooling test (optional) Purpose: To verify whether the system's heat dissipation is normal and eliminate the "heat storage hazard" caused by excessive insulation layer wrapping; Operation: After the heating cable runs stably for 2 hours, cut off the power and record the time for each measuring point to drop from the target temperature to the initial temperature (such as from 28 ℃ to 20 ℃); Standard: The cooling time should meet the design expectations (if the cooling time for ground heating is ≥ 2 hours, it indicates that the insulation layer has good insulation effect; if it drops to 20 ℃ within 1 hour, it is necessary to check whether the insulation layer is damaged).     3、 Testing tools and precautions   1. Essential tools (need to be calibrated and qualified) High precision temperature measurement equipment: infrared thermal imaging instrument (resolution ≥ 320 × 240, temperature measurement range -20 ℃~300 ℃), platinum resistance thermometer (accuracy ± 0.1 ℃); Timing tool: stopwatch or electronic timer (accuracy ± 1 second); Recording tool: Inspection Record Form (indicating the location, time, and temperature values of the measuring points, and signing for confirmation). Precautions Avoid environmental interference: Close doors and windows during detection, prohibit frequent movement of personnel (to avoid air flow affecting temperature), and prohibit placing heavy objects in the heating area in ground heating scenarios (to compress the filling layer and affect heat transfer); Pipeline insulation needs to simulate actual working conditions: if there is a medium (such as hot water) inside the pipeline, the temperature of the medium should be kept stable (such as set at 30 ℃), and then the heating effect of the cable should be tested to avoid interference from temperature fluctuations of the medium; Data retention: After the testing is completed, a "Heating Effect Testing Report for Heating Cables" must be issued, accompanied by infrared thermal imaging images and temperature record sheets, as the basis for acceptance.     The core of accepting the heating effect of the heating cable is to verify it through three major indicators: heating speed, temperature uniformity, and temperature control accuracy, combined with professional tools and standard processes, while also investigating hidden problems such as local overheating and abnormal heat dissipation. If the test does not meet the standard, it is necessary to first investigate the cable power matching, laying spacing, insulation layer quality, and other issues, rectify them, and retest to ensure that the system meets safety and usage requirements.