Selection of the installation site of the rapid temperature change test chamber:
The distance from the adjacent wall can smoothly give full play to the role and characteristics of the environmental test chamber. The long-term temperature of 15 ~ 45 °C and the relative environmental humidity exceeding 86% should be selected. site.
The working temperature of the installation site must not change significantly.
It should be installed on a leveling surface (use a level to determine the level on the road during installation).
It should be installed in a site without sun exposure.
It should be installed in a site with excellent natural ventilation.
It should be installed in areas where flammable materials, explosive products and high-temperature heat sources are eliminated.
It should be installed in a site with less dust.
Install it as close as possible to the switching power supply of the power supply system.
High and low temperature test chamber may encounter a variety of problems in the process of use, the following is a summary of potential faults and their causes from different perspectives:
1. Core system failure
Temperature out of control
Reason: PID control parameters are out of balance, ambient temperature exceeds the design range of the equipment, multi-zone temperature interference.
Case: In a special environment workshop, the external high temperature causes the refrigeration system to overload, resulting in temperature drift.
Humidity is abnormal
Reason: poor water quality of humidification leads to scaling and nozzle blockage, failure of ultrasonic humidifier piezoelectric sheet, and incomplete regeneration of dehumidification desiccant.
Special phenomenon: reverse condensation occurs during high humidity test, resulting in the actual humidity in the box being lower than the set value.
2. Mechanical and structural problems
Air flow is disorganized
Performance: There is a temperature gradient of more than 3℃ in the sample area.
Root cause: the customized sample rack changed the original design air duct and the accumulation of dirt on the centrifugal fan blade led to the destruction of dynamic balance.
sealing failure
New failure: the magnetic force of electromagnetic sealing door decreases at low temperature, and the silicone sealing strip becomes brittle and cracks after-70℃.
3. Electrical and control system
Intelligent control failure
Software level: After firmware upgrade, the temperature dead zone setting error occurs and the historical data overflow causes the program to crash.
Hardware level: SSR solid state relay breakdown causes continuous heating and bus communication is subjected to inverter electromagnetic interference.
Security protection vulnerabilities
Hidden dangers: the synchronous failure of the triple temperature protection relay and the false alarm caused by the expiration of the refrigerant detector calibration.
4. Challenges of special working conditions
Specific temperature shock
Problem: -40℃ to +150℃ rapid conversion of the evaporator weld stress cracking, thermal expansion coefficient difference resulting in the failure of the observation window seal.
Long-term operation attenuation
Performance degradation: after 2000 hours of continuous operation, the compressor valve plate wear leads to a decrease of 15% in refrigeration capacity and drift of ceramic heating tube resistance value.
5. Environmental and maintenance impact
Infrastructure adaptation
Case: The power oscillation of PTC heater caused by the fluctuation of power supply voltage and the water hammer effect of cooling water system damaged the plate heat exchanger.
Preventive maintenance blind spots
Lesson: Ignoring the positive pressure of the box leads to water entering the bearing chamber and biofilm growth and blockage in the condensate discharge pipe.
6. Pain points of emerging technologies
New refrigerant application
Challenges: system oil compatibility problems after R448A replaces R404A, and high pressure sealing problems of subcritical CO₂ refrigeration systems.
IoT integration risks
Fault: The remote control protocol is maliciously attacked, resulting in program tampering and cloud storage failure, resulting in the loss of test evidence chain.
Strategy recommendations
Intelligent diagnosis: configure vibration analyzer to predict the failure of compressor bearing, and use infrared thermal imager to scan the electrical connection points regularly.
Reliability design: key components such as evaporator are made of SUS316L stainless steel to improve corrosion resistance, and redundant temperature control modules are added to the control system.
Maintenance innovation: implement a dynamic maintenance plan based on operating hours, and establish an annual refrigerant purity testing system。
The solutions to these problems need to be analyzed in combination with the specific model of the equipment, the use environment and the maintenance history. It is recommended to establish a collaborative maintenance mechanism including the OEM of the equipment, third-party testing institutions and user technical teams. For key test items, it is recommended to configure a dual-machine hot standby system to ensure the continuity of testing.
(1) Equipment installation and commissioning
On-site service: technical personnel will deliver the goods free of charge and complete the mechanical assembly, electrical wiring and debugging. The debugging parameters shall meet the temperature and humidity, salt spray deposition amount and other indicators in the customer's technical agreement.
Acceptance criteria: provide a third-party measurement report, and unqualified equipment shall be returned or replaced directly. For example, the rain test box shall pass 100% acceptance.
(2) Customer training system
Operation training: covers equipment start and stop, program setting and daily maintenance, customized for different user scenarios such as quality inspection institutions and automobile enterprises.
Deep maintenance training: including fault diagnosis (such as troubleshooting of humidity system in high and low temperature and humidity test chamber) and spare parts replacement to improve customers' independent maintenance ability.
(3) Technical support and response
Instant response: respond to repair demand within 15 minutes, and solve routine faults within 48 hours (negotiate with remote areas).
Remote diagnosis: through video guidance or remote access software, quickly locate the problem (such as abnormal dust concentration in the sand test chamber).
(4) Spare parts supply and maintenance
Make spare parts plan, give priority to the supply of wear and tear parts from cooperative units (such as China Railway Inspection and Certification Center, China Electronics Technology Group), and reduce downtime.
Non-manual damage is free of charge during the warranty period, and paid services are provided after the warranty period with transparent charges.
1. Dust adhering to the condenser can cause the high-pressure switch of the compressor to trip and issue false alarms. Therefore, dust attached to the cooling grid of the condenser can be removed with a vacuum cleaner every month, or by using a hard-bristled brush after turning on the machine, or by blowing it off with a high-pressure air nozzle.2. The area around the machine and the ground at the bottom should be kept clean at all times to prevent a large amount of dust from being sucked into the unit or reducing equipment performance and causing accidents.3. When opening or closing the door or taking samples from the test chamber, do not touch the sealing strip on the door.4. The core of the constant temperature and humidity test chamber - the refrigeration system should be inspected once a year. Check for leaks in the copper tubes and at each joint and interface. If there are any, inform the manufacturer.5. The humidifier and water tank should be cleaned frequently to avoid scaling and affecting steam emission. Clean them after each test. Timely descaling helps extend the lifespan of the humidification tube and ensures smooth water flow. When cleaning, use a copper brush and then rinse with water.6. The distribution room should be cleaned and inspected more than once a year. Loose nodes can put the entire equipment in a dangerous working state, burn out components, cause fires, alarms, and endanger lives.7. The dry and wet bulb wicks should be checked frequently. Replace them promptly if they become hard or dirty. It is recommended to replace them every three months.8. Inspection and maintenance of the water circuit. The water pipes in the water circuit are prone to clogging and leakage. Regularly check for leaks or blockages. If found, remove them promptly or notify the manufacturer.
1. प्रशीतन इकाई का कंडेनसर (या रेडिएटर) शीत एवं ताप आघात परीक्षण कक्ष यह सुनिश्चित करने के लिए कि यह साफ रहे, नियमित रूप से इसका रखरखाव किया जाना चाहिए। कंडेनसर पर चिपकी धूल कंप्रेसर के उच्च दबाव वाले स्विच को ट्रिप कर सकती है, जिससे गलत अलार्म बज सकता है। कंडेनसर की कूलिंग मेश से धूल हटाने के लिए कंडेनसर को हर महीने वैक्यूम क्लीनर से साफ किया जाना चाहिए, या मशीन चालू करने के बाद, इसे साफ करने के लिए सख्त ब्रिसल वाले ब्रश का इस्तेमाल करें, या उच्च दबाव वाले एयर नोजल से धूल को उड़ा दें।2. दरवाजा खोलते या बंद करते समय या भट्ठी से परीक्षण वस्तु लेते समय, वस्तु को दरवाजे पर लगे रबर के किनारे को छूने न दें, ताकि रबर के किनारे को क्षतिग्रस्त होने से बचाया जा सके और जीवन छोटा हो सके।3. इकाई में बड़ी मात्रा में धूल के प्रवेश के कारण होने वाली दुर्घटनाओं और प्रदर्शन में गिरावट से बचने के लिए धड़ के आसपास और नीचे की जमीन को हमेशा साफ रखें।4. ठंडे और गर्म शॉक टेस्ट चैंबर की फ्रीजिंग प्रणाली इस मशीन का मुख्य हिस्सा है। कृपया हर छह महीने में रिसाव और बर्फ की स्थिति के लिए सभी तांबे की ट्यूबों का निरीक्षण करें, साथ ही सभी नोजल और वेल्डिंग जोड़ों का भी निरीक्षण करें। यदि तेल रिसाव है, तो कृपया कंपनी को सूचित करें या सीधे उससे निपटें।5. वितरण कक्ष में वितरण पैनल के बड़े करंट संपर्क को साल में कम से कम एक बार साफ और मरम्मत किया जाना चाहिए। संपर्क के ढीले होने से पूरे उपकरण को जोखिम भरी स्थिति में काम करना पड़ेगा। सबसे अच्छी स्थिति में, यह घटकों को जला देगा, और सबसे खराब स्थिति में, यह आग, अलार्म और व्यक्तिगत चोट का कारण बनेगा। सफाई करते समय, कमरे में धूल को हटाने के लिए वैक्यूम क्लीनर का उपयोग करें।6. ठंडे और गर्म शॉक टेस्ट चैंबर के पावर डिस्ट्रीब्यूशन बॉक्स में दो ओवर-टेम्परेचर प्रोटेक्टर के सेटिंग वैल्यू को लापरवाही से एडजस्ट न करें। इसे फैक्ट्री में एडजस्ट किया गया है। इस प्रोटेक्टिव स्विच का इस्तेमाल हीटिंग ट्यूब को खाली जलने और अलार्म से बचाने के लिए किया जाता है। सेटिंग पॉइंट = तापमान सेटिंग पॉइंट 20℃~30℃।7. ठंडा और गर्म झटका परीक्षण कक्ष जब परीक्षण उत्पाद लिया जाता है, जब समय आता है, तो यह बंद स्थिति में होना चाहिए और कर्मचारियों को उत्पाद लेने और रखने के लिए सूखे, बिजली विरोधी और तापमान प्रतिरोधी दस्ताने पहनने चाहिए।8. कोल्ड और हीट शॉक टेस्ट चैंबर के अंदर और बाहर की सफाई करें और उसका रखरखाव करें। 9. कोल्ड और हीट शॉक टेस्ट चैंबर को चलाने से पहले, अंदर की सारी अशुद्धियाँ हटा दें। 10. बिजली वितरण कक्ष को साल में कम से कम एक बार साफ किया जाना चाहिए। सफाई करते समय, धूल हटाने के लिए वैक्यूम क्लीनर का इस्तेमाल करें। चैंबर के बाहरी हिस्से को साल में कम से कम एक बार साफ किया जाना चाहिए, पोंछने के लिए साबुन के पानी का इस्तेमाल करें।
एक कहावत कहना
IPv6 नेटवर्क समर्थित