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Fox 200 Heat Flow Meter Specifications for Laboratory Thermal Conductivity Testing of Insulation
Quick Answer: The Fox 200 heat flow meter measures thermal conductivity of insulation materials in a range from about 0.005 to 0.35 W/mK. It follows ASTM C518 and ISO 8301 steady-state methods. Insulation labs use this instrument for repeatable k-factor data on foam, fiberglass, mineral wool, and aerogel blanket samples.
What the Fox 200 Heat Flow Meter Measures
The Fox 200 is a guarded heat flow meter built for steady-state thermal conductivity tests. Laboratories use it to measure the k-factor of flat sheet insulation samples. Typical samples include polyurethane foam, expanded polystyrene, extruded polystyrene, mineral fiber board, perlite board, and aerogel blanket. Heat moves from a hot plate through the sample to a cold plate. Heat flux transducers on both plate surfaces measure the heat flow. When the sample reaches thermal equilibrium, the software calculates thermal conductivity from the Fourier law.
Key Specifications for Insulation Labs
Most insulation labs request the same core specs. The Fox 200 has a thermal conductivity range of roughly 0.005 to 0.35 W/mK. The common sample size is 200 mm by 200 mm, with 300 mm by 300 mm available on some configurations. Thickness handling depends on the specimen frame. Typical specimens range from 5 mm to 50 mm, and some frames accept thicker rigid boards. The standard plate temperature range covers -20 °C to 75 °C. Many users run tests at mean temperatures of 10 °C, 25 °C, and 40 °C. Thin film heat flux transducers reduce contact resistance and improve repeatability. The system uses closed loop temperature control. Data acquisition software records heat flux, plate temperatures, and sample thickness. Results are reported as k-factor in W/mK and thermal resistance in m2K/W.
Sample Types and Applications
Most users test insulation for building envelopes, cold chain packaging, LNG containment, and appliance panels. A foam insulation maker in Vietnam tested rigid polyurethane panels at 25 °C mean temperature. They needed k-factor data below 0.025 W/mK for export documentation. A mineral wool plant in Turkey used the Fox 200 to check batch consistency after changing binder content. In practice, lab technicians care more about repeatability than absolute accuracy. The guarded heat flow method is less sensitive to edge losses than hot wire methods. For production QC labs, the Fox 200 is a practical choice. Sample preparation still matters. Flat surfaces and uniform thickness reduce air gaps and contact resistance.
How the Fox 200 Works in Practice
Technicians place a flat sample between two temperature controlled plates. The lower plate heats the sample. The upper plate cools the sample. Heat flux transducers cover the plate surfaces. These transducers produce a small voltage proportional to heat flow. The instrument waits for steady state. Thermal equilibrium can take 30 minutes to several hours depending on sample thickness and density. The software then records the temperature difference across the sample and the average heat flux. Thermal conductivity is calculated as heat flux multiplied by thickness divided by temperature difference. Calibration is normally done with reference samples from NIST or a similar national metrology body. Some labs keep a set of glass fiber board reference samples for periodic drift checks. In our experience, a dirty transducer surface causes more bad data than sample variation. Clean the plates with a dry cloth between runs.
Typical Lab Workflow and Practical Notes
Sample conditioning is the first step. Many insulation materials hold moisture. A sample exposed to humid air in Ho Chi Minh City or Lagos will show a higher k-factor than the same sample dried in a desiccator. Users should condition samples at 23 °C and 50 percent relative humidity for at least 24 hours before the test. The thickness measurement matters just as much as heat flux.
Model and Price Positioning for Export Labs
The Fox 200 is not a low cost device. For a new unit, many labs budget between USD 40,000 and USD 80,000 depending on options, software, calibration, and local distributor support. Used units appear on the market from time to time. Service history matters. A heat flow meter with worn transducers or a damaged temperature controller will not give reliable data. Laboratories in Indonesia, Saudi Arabia, Mexico, and Nigeria often buy through local agents. They need local calibration support and spare parts. If you are setting up a new insulation test lab, request a formal quote with the ASTM C518 test accessory set, reference standards, and one day of on-site training.
Recommended Flow Instruments for Insulation Production
Silver Automation Instruments does not sell the Fox 200 heat flow meter. We supply process instruments for the production lines that feed insulation labs. For polyurethane foam plants, Coriolis mass flow meters handle polyol and MDI dosing. A typical line uses DN10 to DN25 Coriolis meters with 4-20 mA HART output and PT100 temperature compensation. Accuracy of 0.2 percent of rate keeps the foam formula stable. For expanded polystyrene production, oval gear flow meters measure pentane blowing agent. For cooling water circuits, electromagnetic flow meters with flange connections from DN25 to DN200 give reliable total flow data. For compressed air systems that feed pneumatic presses, vortex flow meters or thermal mass flow meters are common. We supply these instruments to foam producers in Vietnam, Turkey, Egypt, and Argentina. Send us your fluid name, flow range in kg/h or m3/h, pressure in bar, temperature in °C, and pipe size in DN. We will recommend a model and a price range within one working day.
Contact Information
Reach Silver Automation Instruments by phone at +86-25-68650347. For WhatsApp, use +86-25-52155837. For WeChat, use +86 15365082610. You can also send a message through the website at flow-meter.com.au. Tell us your application, not just the instrument model. For insulation production lines, include the foam type, line capacity, and utility details. We respond to RFQs from Asia, Oceania, Latin America, Africa, and the Middle East.
FAQ: Five Key Questions on the Fox 200 Heat Flow Meter
Q1: What standards does the Fox 200 follow?
A1: The Fox 200 follows ASTM C518 and ISO 8301 for steady-state thermal resistance measurements. These are the two standards most commercial insulation labs request.
Q2: Can the Fox 200 measure thin reflective insulation?
A2: Reflective insulation with low emissivity surfaces is not ideal for this method. The Fox 200 works best with flat, homogeneous, low density insulation such as foam boards, mineral wool, and aerogel blankets.
Q3: How long does one test take?
A3: Thermal equilibrium can take 30 minutes to several hours. The exact time depends on sample thickness, density, and mean temperature. Thin foam samples reach steady state faster than thick mineral wool boards.
Q4: What is the biggest source of error in heat flow meter tests?
A4: Air gaps between the sample and the transducer plates are the biggest source of error in practice. Poor thickness measurement and moisture in the sample also shift results.
Q5: Does Silver Automation Instruments sell the Fox 200?
A5: No. Silver Automation Instruments supplies process flow meters and pressure transmitters for insulation production lines. For the Fox 200 itself, contact a thermal analysis instrument distributor in your region.
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