{"product_id":"heat-flow-meter-thermal-conductivity-tester","title":"Heat Flow Meter - Thermal Conductivity Tester","description":"\u003ch2\u003e\u003cspan\u003eHeat Flow Meter – Thermal Conductivity Tester QualiHFM™ 2000\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiHFM™ 2000 Heat Flow Meter and Thermal Conductivity Tester measures thermal conductivity, an essential property for assessing material heat resistance and insulation performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiHFM™ 2000 accurately measures the thermal conductivity of uniform plate materials, including plastics, rubber, glass, fiberboard, styrene board, extruded board, foamed concrete, hollow glass, and wood board. It also supports testing of granular, bulk, and soft materials under varying temperature conditions to deliver precise and reliable measurement results.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eHeat Flow Meter – Thermal Conductivity Tester QualiHFM™ 2000 Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eStable PLC Control:\u003c\/span\u003e\u003cspan\u003e An OMRON programmable logic controller (PLC) CPU unit with a dedicated temperature expansion module provides strong interference resistance and stable operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eReliable Isolation Control:\u003c\/span\u003e\u003cspan\u003e Solid-state, contactless switching delivers high reliability, low noise, and rapid switching performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eRS-232 Connectivity:\u003c\/span\u003e\u003cspan\u003e A standard RS-232 serial port provides convenient and reliable communication.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003ePrecise Temperature Regulation:\u003c\/span\u003e\u003cspan\u003e Software-based PID self-tuning optimizes control parameters to maintain accurate temperature conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eMulti-Specimen Testing:\u003c\/span\u003e\u003cspan\u003e The system accommodates three groups of six specimens simultaneously, helping minimize thermal conductivity deviations caused by system errors.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eFlexible Operation:\u003c\/span\u003e\u003cspan\u003e The software control system supports automatic and manual operating modes to meet different testing requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eTheory \u0026amp; Method\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiHFM™ Heat Flow Meter thermal conductivity tester series, including the QualiHFM™ 2000 and QualiHFM™ 510A, measures thermal conductivity (\u003c\/span\u003e\u003cspan\u003eλ\u003c\/span\u003e\u003cspan\u003e) using the steady-state heat flux method. The instrument establishes a controlled temperature difference (Δ\u003c\/span\u003e\u003cspan\u003eT\u003c\/span\u003e\u003cspan\u003e) across a specimen positioned between two temperature-regulated plates. Thermal transport properties are then calculated using Fourier’s Law of Heat Conduction in accordance with ASTM C518, ISO 8301, and DIN EN 12667.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eCore Measurement Principle\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eA test specimen measuring 300 mm × 300 mm, with a thickness (\u003c\/span\u003e\u003cspan\u003ed\u003c\/span\u003e\u003cspan\u003e) ranging from 10 mm to 60 mm, is placed between the upper and lower plates. Integrated thermoelectric modules regulate the plate temperatures from -5°C to 95°C, with a resolution of 0.01°C, establishing a one-dimensional temperature gradient across the specimen.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHeat flows from the warmer plate through the test material toward the cooler plate. Once steady-state heat transfer is established, calibrated heat flux transducers measure the heat flux density (\u003c\/span\u003e\u003cspan\u003eq\u003c\/span\u003e\u003cspan\u003e). The instrument then calculates thermal conductivity using Fourier’s equation:\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cem\u003e\u003cstrong\u003eλ\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e = (\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003eq\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e × \u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003ed\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e) \/ Δ\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003eT\u003c\/strong\u003e\u003c\/em\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003eWhere:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eλ — Thermal Conductivity:\u003c\/span\u003e\u003cspan\u003e Measured over a range of 0.001 to 2.000 W\/(m·K), with an accuracy of ±3%.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eq — Heat Flux Density:\u003c\/span\u003e\u003cspan\u003e The measured rate of heat energy transfer per unit surface area.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003ed — Specimen Thickness:\u003c\/span\u003e\u003cspan\u003e The actual sample thickness measured during testing, with a standard baseline of 25 mm.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eΔT — Temperature Difference:\u003c\/span\u003e\u003cspan\u003e The temperature difference between the hot and cold plates.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003cspan\u003eR — Thermal Resistance:\u003c\/span\u003e\u003cspan\u003e The calculated thermal resistance, with a specified value of ≥ 0.02 m²·K\/W.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eTesting Workflow and Instrument Architecture\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiHFM™ Thermal Conductivity Tester combines automated plate positioning with software-controlled temperature regulation to support consistent thermal conductivity measurements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. \u003c\/span\u003e\u003cspan\u003eSpecimen Placement:\u003c\/span\u003e\u003cspan\u003e Place flat material specimens on the lower plate. Suitable materials include plastics, rubber, glass, fiberboard, styrene board, extruded board, foamed concrete, wood, and soft materials. The specimen surface flatness should remain within 0.1 mm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2. \u003c\/span\u003e\u003cspan\u003eMotorized Clamping:\u003c\/span\u003e\u003cspan\u003e Automated plate drives apply a controlled clamping force of ≤ 2.5 kPa, ensuring uniform contact between the specimen and the plates while minimizing insulating air gaps.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e3. \u003c\/span\u003e\u003cspan\u003ePID Temperature Control:\u003c\/span\u003e\u003cspan\u003e An industrial OMRON PLC CPU unit with dedicated expansion modules uses software-based PID self-tuning to stabilize the hot and cold plates at their specified temperature setpoints.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e4. \u003c\/span\u003e\u003cspan\u003eEquilibrium Detection:\u003c\/span\u003e\u003cspan\u003e Solid-state, contactless switching provides low-noise isolation control while heat flux sensors monitor heat transfer. The system can test three groups of six specimens, helping reduce measurement deviations associated with system errors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e5. \u003c\/span\u003e\u003cspan\u003eAutomated Calculation:\u003c\/span\u003e\u003cspan\u003e Through the RS-232 connection, the software records specimen thickness readings, plate temperatures, and transducer voltage signals. Thermal conductivity (\u003c\/span\u003e\u003cspan\u003eλ\u003c\/span\u003e\u003cspan\u003e) and thermal resistance (\u003c\/span\u003e\u003cspan\u003eR\u003c\/span\u003e\u003cspan\u003e) are calculated and displayed in real time.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eError Prevention and Measurement Controls\u003c\/h2\u003e\n\u003cp\u003eTo ensure high repeatability (±1%), the QualiHFM™ Heat Flow Meter thermal conductivity tester addresses key testing variables directly:\u003c\/p\u003e\n\u003ctable class=\"table table-style-align-center\" align=\"center\" border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eTesting Factor\u003c\/th\u003e\n\u003cth\u003eImpact on Measurement\u003c\/th\u003e\n\u003cth\u003eSystem Control Mechanism\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterfacial Contact Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSurface gaps add unwanted thermal resistance, skewing conductivity values lower.\u003c\/td\u003e\n\u003ctd\u003e\n\u003cul\u003e\n\u003cli\u003eMotorized plates deliver uniform clamping force (≤ 2.5 kPa)\u003c\/li\u003e\n\u003cli\u003eFlexible thermal interface pads flatten micro-surface roughness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSide Thermal Losses\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHeat escaping horizontally breaks one-dimensional heat transfer assumptions.\u003c\/td\u003e\n\u003ctd\u003eActive thermal guard zones surround the 300 × 300 mm testing surface to direct heat strictly top-to-bottom.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Fluctuation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlate temperature drift delays steady-state conditions and alters sensor outputs.\u003c\/td\u003e\n\u003ctd\u003ePID self-tuning software coupled with OMRON PLC modules holds temperature stability down to 0.01°C.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness Variations\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eInaccurate thickness tracking causes linear calculation errors in Fourier's formula.\u003c\/td\u003e\n\u003ctd\u003eIntegrated digital encoders track sample thickness throughout the 10 mm to 60 mm range in real time.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eMethod Comparison: QualiHFM™ vs. Alternative Rigs\u003c\/h2\u003e\n\u003ctable class=\"table table-style-align-center\" align=\"center\" border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eInstrument Class\u003c\/th\u003e\n\u003cth\u003eTesting Speed\u003c\/th\u003e\n\u003cth\u003eTarget Material Types\u003c\/th\u003e\n\u003cth\u003eOperating Advantages\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eQualiHFM™ Heat Flow Meter\u003c\/td\u003e\n\u003ctd\u003eFast (20 to 60 mins)\u003c\/td\u003e\n\u003ctd\u003ePlastics, rubber, glass, fiberboard, foamed concrete (0.001 - 2.000 W\/m·K)\u003c\/td\u003e\n\u003ctd\u003eHigh sample throughput, ±1% repeatability, OMRON PLC control, fully compliant with ASTM C518 and ISO 8301.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarded Hot Plate (GHP)\u003c\/td\u003e\n\u003ctd\u003eSlow (4 to 8 hours)\u003c\/td\u003e\n\u003ctd\u003ePrimary laboratory reference standards\u003c\/td\u003e\n\u003ctd\u003eAbsolute accuracy, but high equipment costs and long test cycles.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransient Flash Systems\u003c\/td\u003e\n\u003ctd\u003eSeconds\u003c\/td\u003e\n\u003ctd\u003eMetals, dense ceramics, liquids\u003c\/td\u003e\n\u003ctd\u003eBest for high conductors; less practical for low-density insulations.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eHeat Flow Meter - Thermal Conductivity Tester QualiHFM™ 2000 Technical Specifications\u003c\/h2\u003e\n\u003ctable class=\"table table-style-align-center\" align=\"center\" border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eThermal conductivity measurement range\u003c\/th\u003e\n\u003ctd\u003e0.001—2.000 W\/(m•K)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThermal resistance measurement range\u003c\/th\u003e\n\u003ctd\u003e≥0.02 m²•K\/W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThermal conductivity measurement accuracy\u003c\/th\u003e\n\u003ctd\u003e±3%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThermal conductivity measurement repeatability\u003c\/th\u003e\n\u003ctd\u003e±1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTemperature control range\u003c\/th\u003e\n\u003ctd\u003e-5~95℃\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTemperature resolution\u003c\/th\u003e\n\u003ctd\u003e0.01℃\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecimen size\u003c\/th\u003e\n\u003ctd\u003e300mm×300mm×H(10 ~ 60) mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecimen flatness\u003c\/th\u003e\n\u003ctd\u003e0.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard thickness\u003c\/th\u003e\n\u003ctd\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClamp force\u003c\/th\u003e\n\u003ctd\u003e≤2.5kPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAmbient temperature\u003c\/th\u003e\n\u003ctd\u003e15-30 ℃, standard temperature 23±2℃\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHumidity\u003c\/th\u003e\n\u003ctd\u003e20-80%RH, standard 40-60%RH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003eAC 220V±10%, 2.5kW (110V is also available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Qualitest USA LC","offers":[{"title":"Default Title","offer_id":53493781987639,"sku":null,"price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0786\/1859\/1543\/files\/heat-flow-meter-thermal-conducti.webp?v=1793685132","url":"https:\/\/qualitest.us\/es\/products\/heat-flow-meter-thermal-conductivity-tester","provider":"Qualitest USA LC","version":"1.0","type":"link"}