Gravity-convection oven with a temperature uniformity within of the differential.
Gravity ovens generally cover a range from 20∘C20 raised to the composed with power C above ambient to 200∘C200 raised to the composed with power C . Forced-ventilation covers 20∘C20 raised to the composed with power C above ambient up to 500∘C500 raised to the composed with power C 📥 How to Get the PDF
Checked by monitoring the temperature at multiple points (usually 9 thermocouples) within the testing chamber. astm e145 pdf
Open the door for 30 seconds (simulating specimen loading). Close it and measure how long it takes to return to the set point. This must be within the standard's limit (typically under 15 minutes for Type II).
If you are buying a new lab oven, the supplier may claim it "meets ASTM E145." To verify this, you need the PDF to check the actual temperature tolerances. For example, a Type II oven must maintain uniformity within ±1% of the set point in degrees Celsius or ±1°C, whichever is greater. Open the door for 30 seconds (simulating specimen loading)
E145 Standard Specification for Gravity-Convection ... - ASTM
ASTM E145 defines the metrics for evaluating the performance of solar collectors. These metrics include thermal efficiency, incidence angle modifier, and the collector time constant. Understanding these metrics is crucial for comparing the performance of different solar collectors. If you are buying a new lab oven,
The calculation of the volume of air passing through the oven per unit of time. ⚠️ Important Scope Limitations
The standard requires you to place temperature sensors (thermocouples) in a 3x3 grid across the usable working volume. You will run the oven at your intended operating temperature (e.g., 70°C, 150°C, 300°C) and record data for a minimum of 30 minutes after stabilization.