{"id":1778,"date":"2025-06-05T11:06:03","date_gmt":"2025-06-05T03:06:03","guid":{"rendered":"https:\/\/www.dhtchamber.com\/?p=1778"},"modified":"2025-07-10T11:05:18","modified_gmt":"2025-07-10T03:05:18","slug":"constant-temperature-and-humidity-test-chamber-procurement-guide-avoiding-pitfalls-from-parameters-to-after-sales","status":"publish","type":"post","link":"https:\/\/www.dhtchamber.com\/fr\/constant-temperature-and-humidity-test-chamber-procurement-guide-avoiding-pitfalls-from-parameters-to-after-sales\/","title":{"rendered":"Guide d'achat d'enceintes d'essais \u00e0 temp\u00e9rature et humidit\u00e9 constantes : \u00c9viter les pi\u00e8ges des param\u00e8tres \u00e0 l'apr\u00e8s-vente"},"content":{"rendered":"<div data-page-id=\"OYZmdqSGjoPZIHx2pCZc1iFpnJe\" data-lark-html-role=\"root\" data-docx-has-block-data=\"false\">\n<div>\n<div style=\"text-align: center;\" data-zone-id=\"0\" data-line-index=\"0\" data-line=\"true\"><strong>\u00c9crit par Dorothy<\/strong><\/div>\n<div data-zone-id=\"0\" data-line-index=\"0\" data-line=\"true\">\n<div>\n<div style=\"text-align: center;\" data-zone-id=\"0\" data-line-index=\"0\" data-line=\"true\"><strong>Responsable des ventes, <a href=\"https:\/\/www.dhtchamber.com\/fr\/contact\/\">Test Doaho (DHT\u00ae)<\/a><\/strong><\/div>\n<\/div>\n<\/div>\n<\/div>\n<h4 class=\"heading-4 ace-line old-record-id-ZwSUd8hNdonJk5x3rSYci2wun6f\">Qu'est-ce que c'est <a href=\"https:\/\/www.dhtchamber.com\/fr\/temperature-and-humidity-test-chamber\/\">Chambre \u00e0 temp\u00e9rature et humidit\u00e9 constantes<\/a>?<\/h4>\n<div class=\"ace-line ace-line old-record-id-OcJAd60K7o9xRtxMgaWcworznng\">A constant temperature and humidity test chamber is a vital environmental simulation device used to verify the reliability and stability of products under specific temperature and humidity conditions. More than just a testing instrument, it is an essential quality assurance tool widely applied across electronics, automotive, aerospace, new energy, defense, materials, and biomedical industries. It helps enhance product quality, boost brand credibility, and reduce market risks.<\/div>\n<div class=\"ace-line ace-line old-record-id-DFMjdLfVQopKfmxfyy2ctUnlnCg\">However, the market offers a dizzying variety of models with large price gaps and widely varying specifications. For many engineers and procurement professionals, selecting a chamber that truly meets technical needs while offering reliable performance and after-sales support can be a major challenge.<\/div>\n<div class=\"ace-line ace-line old-record-id-V1FQd2Qxrox6jSxRgk1cX2Pmn2c\">This article offers a practical procurement guide\u2014from core selection criteria and technical parameters to supplier evaluation and after-sales support\u2014to help you avoid common pitfalls and make an informed decision.<\/div>\n<h3 class=\"heading-3\">Clearly Define Your Testing Needs<\/h3>\n<div class=\"ace-line ace-line old-record-id-LmsUd47HeoeO2gxTyCkcD3Nxnze\">Before purchasing a chamber, the most important step is clarifying your specific testing requirements, including:<\/div>\n<ul class=\"list-bullet1\">\n<li class=\"ace-line ace-line old-record-id-UcMVdvVlmoGU1VxJg2ycCyumneg\" data-list=\"bullet\">\n<div><strong>Temperature and Humidity Range<\/strong>: Choose based on actual testing needs\u2014not the \u201cbigger, the better\u201d myth. Common ranges include -20\u00b0C to +150\u00b0C, -40\u00b0C to +150\u00b0C, and -70\u00b0C to +150\u00b0C. Confirm whether the advertised range refers to stable and uniform conditions, not just peak extremes achievable by overloading the compressor or heater. Pay special attention to the <em>effective humidity range<\/em>! For example, 20%\u201398% RH can typically only be achieved between 25\u00b0C and 80\u00b0C. Outside of this range, humidity control can significantly decline or fail. Always request a humidity performance chart from the supplier.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-DBIcdHvvgoMwRQxWAE0ct49Rnqh\" data-list=\"bullet\">\n<div><strong>Chamber Volume<\/strong>: Match the test chamber size to your sample dimensions and quantity, leaving adequate spacing. Oversized chambers unnecessarily raise costs. Avoid crowding, as it disrupts airflow and undermines uniformity and stability, making results unreliable.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-ZtHxd1E86onMRlx3uu0cMjSvnvg\" data-list=\"bullet\">\n<div><strong>Temperature Change Rate<\/strong>: If fast ramp rates like 3\u00b0C\/min or 5\u00b0C\/min are needed, this affects both configuration and price. Be sure to distinguish:<\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-MVNTdQaotoyjAex0aqOcaTrCnad\" data-list=\"bullet\">\n<div><em>Linear Rate<\/em>: A true, consistent ramp across the full temperature range (e.g., -40\u00b0C to +85\u00b0C at 5\u00b0C\/min).<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-BuKedGFz6okUVzxciPNccOBOndd\" data-list=\"bullet\">\n<div><em>Average Rate<\/em>: Total temperature difference divided by total time, ignoring actual fluctuations\u2014often faster on paper but inferior in real performance.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-Ecycdo6vao5P8HxZ7KEcb8RtnLc\" data-list=\"bullet\">\n<div><strong>Compliance with Industry Standards<\/strong>: Standards such as IEC, MIL-STD, and GB define strict criteria for accuracy, stability, and uniformity. Discuss testing conditions in detail with technical engineers to ensure the selected chamber meets your testing protocol.<\/div>\n<\/li>\n<\/ul>\n<h3 class=\"heading-3\">Understand Core Technical Parameters to Avoid \u201cSpec Traps\u201d<\/h3>\n<div class=\"ace-line ace-line old-record-id-U275dPx6BoPQlrx423fcdH1WnpJ\">Some manufacturers exaggerate performance or omit critical specs. Key areas to verify include:<\/div>\n<ul class=\"list-bullet1\">\n<li class=\"ace-line ace-line old-record-id-AlSxdwH6HoUsEAx3klYctiZNnoe\" data-list=\"bullet\">\n<div><strong>Contr\u00f4le <\/strong><strong>Pr\u00e9cision<\/strong><strong> &amp; Stability<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-OGGbdU5Fuo0HWix1vLHcuLNOnHf\" data-list=\"bullet\">\n<div>High-quality equipment typically delivers \u2264\u00b10.5\u00b0C temperature fluctuation and \u2264\u00b12.5%RH humidity fluctuation.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-DC2UdIYZBoNpeBxZL1XcO0Bdnbd\" data-list=\"bullet\">\n<div>These directly affect test repeatability and reliability.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-OdoydfjrGoYUwSxAza0ckP7mnYg\" data-list=\"bullet\">\n<div><strong>Control System<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-A9ofdF6iaovVw4xvPDDcEi5EnGh\" data-list=\"bullet\">\n<div>Choose chambers with proprietary or industrial-grade embedded controllers (e.g., PLC + touchscreen). Look for features like remote monitoring, programmable cycles, and power failure recovery.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-ZTJHd5avBoWfyJxBcQlcMg2gnrh\" data-list=\"bullet\">\n<div><strong>Dehumidification Method<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-DcGddeJ3moC9qpxjXCccdPQJnVh\" data-list=\"bullet\">\n<div>Two main types: <strong>condensation-based<\/strong> et <strong>desiccant-based<\/strong>.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-V19AdMyM1oAMrJx0rQzcUeZpnNc\" data-list=\"bullet\">\n<div>For &lt;10%RH humidity control, dual dehumidification or dry gas injection systems are recommended.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-CdcCdOE3koumzZx6ZqIcYer8nmO\" data-list=\"bullet\">\n<div><strong>Material and Sealing<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-YxBzdNDzSoUaakxDJincqSAInUg\" data-list=\"bullet\">\n<div>Interior: SUS304 stainless steel; Exterior: powder-coated cold-rolled steel or stainless steel.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-SUC7d6pvYo9q6wx6Gc7ctkOOnL3\" data-list=\"bullet\">\n<div>Door seals and locking systems should prevent heat\/moisture leakage.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 class=\"heading-3\">Don\u2019t Overvalue Price\u2014Focus on Performance, Not Hype<\/h3>\n<div class=\"ace-line ace-line old-record-id-NPLZdDwq5oPVDTxXHF6chZuKnPh\">Price can vary widely\u2014from tens of thousands to hundreds of thousands of RMB or USD\u2014based on performance and build quality. Influencing factors include:<\/div>\n<ul class=\"list-bullet1\">\n<li class=\"ace-line ace-line old-record-id-Av1JdNUYYo1OFGxfh2Dc4gJtnqG\" data-list=\"bullet\">\n<div><strong>Control Logic<\/strong>: Basic PID vs. advanced programmable systems.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-UYIhdJOjAoDRfjxLe1GcmSWYnrg\" data-list=\"bullet\">\n<div><strong>Refrigeration System<\/strong>: Imported compressors (e.g., Danfoss, Bitzer) cost more but offer longer life and greater reliability.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-RJNrd5DVvoxjrIx77nFc3xKHnde\" data-list=\"bullet\">\n<div><strong>Craftsmanship<\/strong>: Elements like airflow ducting, insulation, and structural integrity are less visible but critical to performance.<\/div>\n<\/li>\n<\/ul>\n<div class=\"ace-line ace-line old-record-id-GyGWd1S2hov8RRxAZJScG5UCnCd\">Compare pricing only after ensuring <em>comparable performance<\/em>. Be wary of suppliers who lure you with a low base price only to upcharge later for essential configurations.<\/div>\n<h3 class=\"heading-3\">Choose the Right Supplier<\/h3>\n<ul class=\"list-bullet1\">\n<li class=\"ace-line ace-line old-record-id-Brh7dg5dhotMUQxzJjqc8I66nMh\" data-list=\"bullet\">\n<div><strong>Credentials &amp; Capabilities<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-CuXodgtNnoFPBFxDzzlcD1jsnPc\" data-list=\"bullet\">\n<div><strong>Experience &amp; Reputation<\/strong>: Ask for case studies in your industry (electronics, automotive, defense). Contributions to national\/industry standards are a bonus.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-CYW1dKJlHodbo1xonKmcTWnInYd\" data-list=\"bullet\">\n<div><strong>R&amp;D<\/strong><strong> and Manufacturing<\/strong>: Can they independently develop core technologies, or are they merely assembling imported parts?<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-J38vdhn64odGU8xzgnacjBjHnag\" data-list=\"bullet\">\n<div><strong>Certifications<\/strong>: ISO 9001 is a minimum. CE\/UL\/ETL marks\u2014though not always mandatory\u2014reflect a commitment to quality.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-Jdrbdq3CDopbKyxWkdtczdLCnKh\" data-list=\"bullet\">\n<div><strong>Technical Transparency<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-MBrZdXAaLo9zJZxIspacIsDOnuh\" data-list=\"bullet\">\n<div><strong>Detailed Configuration Lists<\/strong>: Insist on documentation detailing brands, models, and specs of critical components (compressors, controllers, sensors, valves, insulation, sheet metal thickness, etc.).<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-GuTzdpCDLo75YBxenBRcoGXPnnh\" data-list=\"bullet\">\n<div><strong>Technical Response<\/strong>: Can the supplier clearly explain how their system meets your requirements\u2014and commit in writing?<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-GkxKdgh3HofvJixmuPscfonInBb\" data-list=\"bullet\">\n<div><strong>Price Evaluation<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-Jf6JdxWsDoaTgRxl8yocPvKDnSg\" data-list=\"bullet\">\n<div><strong>Apples-to-Apples Comparison<\/strong>: Once you have consistent specs, compare pricing across vendors. A difference &gt;20% warrants investigation\u2014often a sign of cut corners on components or service.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-LfQAd474yo7Gc3x6Wppcr9R6nre\" data-list=\"bullet\">\n<div><strong>Co\u00fbt total de possession<\/strong>: Factor in energy efficiency, maintenance, parts availability, and downtime risk. \u201cCheap\u201d upfront often means \u201cexpensive\u201d in the long run.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 class=\"heading-3\">After-Sales Support: The Key to Long-Term Reliability<\/h3>\n<ul class=\"list-bullet1\">\n<li class=\"ace-line ace-line old-record-id-Koh2ds0kco9dE5x2aOOcM3R6nZf\" data-list=\"bullet\">\n<div><strong>Warranty Terms<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-N4JvdT8y6oltVvxRESkcUzBdnmg\" data-list=\"bullet\">\n<div>Clearly defined and contractually binding.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-A88Wd5thFoN4vRxOe1CciSnAnwJ\" data-list=\"bullet\">\n<div>Typical: 1\u20133 years for the whole system; extended warranty for compressors or core components is a plus.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-Bdusd5AfroS8I2xBFGVcAPw0nHf\" data-list=\"bullet\">\n<div>Specify coverage scope (e.g., sensors, heaters, controller, compressor, etc.), exclusions, and whether labor\/travel costs are included.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-VRFkdaAiNo9Sh3xjhB7cXrWInah\" data-list=\"bullet\">\n<div><strong>Service Responsiveness<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-VtfadvMf1oKBQjxqvxBcD3tHnUe\" data-list=\"bullet\">\n<div>Define response times: e.g., \u226424 hours for remote support, \u226448\/72 hours for on-site.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-TPtKdX5smoYb1lxIrcHc8Ubsnkb\" data-list=\"bullet\">\n<div>Ensure 24\/7 phone or remote technical support is available.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-VGxpdrmoxoCjhjxoEOpcKvAjncg\" data-list=\"bullet\">\n<div>Are engineers factory-trained and capable of resolving complex issues?<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-YI2Md1TMHouOyFxDBomcSB4ZniY\" data-list=\"bullet\">\n<div><strong>Spare Parts Availability<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-MmRpdkE1wolUrrxrBc6clKe5nWe\" data-list=\"bullet\">\n<div>Check inventory and lead times for both standard and critical parts.<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-JoOPdJ2N1oOhmhx4EtucoD3lnhd\" data-list=\"bullet\">\n<div>Confirm post-obsolescence parts support duration and cost transparency.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-JRoDdbKcHodgRVxKvDHcEJpwnec\" data-list=\"bullet\">\n<div><strong>Training<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-WijmdMyXaoG577xFB1WcjS8Ln2d\" data-list=\"bullet\">\n<div>Look for comprehensive, free training on system operation, programming, and maintenance\u2014ensuring safe and correct use.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-SGeHdsMGQoNV2jxVQDwcftFunve\" data-list=\"bullet\">\n<div><strong>Maintainability (Check Before You Buy)<\/strong><\/div>\n<ul class=\"list-bullet2\">\n<li class=\"ace-line ace-line old-record-id-D7kGdqbtLo7uVRxRoaxc6Cz9nNc\" data-list=\"bullet\">\n<div>Inspect demo units or schematics to ensure:<\/div>\n<ul class=\"list-bullet3\">\n<li class=\"ace-line ace-line old-record-id-Hzwad1MGLoGCRlx1n1kcMlwtnEh\" data-list=\"bullet\">\n<div>Clear wiring and modular design;<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-XVffdLBeOoiB9uxysH3c3gmjnfd\" data-list=\"bullet\">\n<div>Accessible compressors, valves, and sensors;<\/div>\n<\/li>\n<li class=\"ace-line ace-line old-record-id-Sv7WdFLIRoilw6xZANqc9humnUC\" data-list=\"bullet\">\n<div>Sufficient service space inside.<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 class=\"heading-3 ace-line old-record-id-A3lBd7VvZopXbExkR1qcwLCwnYf\">Conclusion<\/h3>\n<div class=\"ace-line ace-line old-record-id-ATuydfFfjogHS9xmXq4ccyujnDd\"><a href=\"https:\/\/www.dhtchamber.com\/fr\/category\/products\/environmental-chamber\/climatic-test-chamber\/\">Une chambre \u00e0 temp\u00e9rature et humidit\u00e9 constantes<\/a> est un atout de test essentiel avec des implications \u00e0 long terme pour le d\u00e9veloppement de produits et le contr\u00f4le de qualit\u00e9. Un achat r\u00e9ussi n\u00e9cessite une \u00e9valuation approfondie des sp\u00e9cifications techniques, de l'ad\u00e9quation \u00e0 l'application, des qualifications du fournisseur et du support apr\u00e8s-vente\u2014plut\u00f4t que de se concentrer sur le prix ou la sur-sp\u00e9cification.<\/div>\n<div class=\"ace-line ace-line old-record-id-Qg1Id26qgoFtCHxDy7KcK5YPncg\">We hope this guide helps you navigate the market wisely, avoid costly mistakes, and select the chamber that truly suits your needs.<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>\u00c9crit par Dorothy Senior Sales Manager, Doaho Test (DHT\u00ae) Qu'est-ce qu'une chambre \u00e0 temp\u00e9rature et humidit\u00e9 constantes ? Une chambre d'essai \u00e0 temp\u00e9rature et humidit\u00e9 constantes est un dispositif de simulation environnementale vital utilis\u00e9 pour v\u00e9rifier la fiabilit\u00e9 et la stabilit\u00e9 des produits dans des conditions de temp\u00e9rature et d'humidit\u00e9 sp\u00e9cifiques. Plus qu'un simple instrument de test, il s'agit d'un [...]<\/p>","protected":false},"author":1,"featured_media":1110,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11,6],"tags":[],"class_list":["post-1778","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-solutions","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/posts\/1778","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/comments?post=1778"}],"version-history":[{"count":0,"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/posts\/1778\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/media\/1110"}],"wp:attachment":[{"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/media?parent=1778"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/categories?post=1778"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dhtchamber.com\/fr\/wp-json\/wp\/v2\/tags?post=1778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}