Emissivity Measurement Apparatus
Product Code : JA-HTLE-7377
The Emissivity Measurement Apparatus (SKU JA-HTLE-7377) finds the emissivity of a test plate by comparing it with an identical plate whose surface is blackened. Each plate is a mica heater sandwiched between two circular plates, and both sit on brackets in a wooden enclosure with a glass side to keep the air still. This emissivity measurement apparatus uses separate variacs to hold both plates at the same temperature, so that the difference in heat input comes from the difference in emissivity.
Specifications
The emissivity apparatus is specified by a test plate and an identical blackened plate, each with a mica heater, temperature sensors on the plates and surroundings, separate variacs, a digital voltmeter and ammeter, and a single-phase 220 V, 4 A supply. Plate diameter is confirmed on the quotation.
| Product | Emissivity Measurement Apparatus |
| SKU | JA-HTLE-7377 |
| Plates | Test plate and identical black (blackened) plate |
| Heaters | Mica heater sandwiched between two circular plates, in each plate |
| Temperature sensors | On each plate and for the surroundings |
| Heat input | Separate variacs; digital voltmeter and digital ammeter |
| Enclosure | Wooden, with one glass side, plates on individual brackets |
| Utilities | 1 phase, 220 V AC, 4 A; table for set-up support |
| Plate diameter | Confirmed on the quotation |
Experiments with the emissivity apparatus
The apparatus is used in radiation practicals: with both plates at the same temperature, all losses except radiation are equal, so the ratio of heat inputs gives the emissivity of the test surface.
- Determining the emissivity of a test plate
- Studying the variation of emissivity with absolute temperature
- Comparing a grey surface with a blackened surface
- Radiation heat transfer practicals in B.Tech and diploma courses
Scope of supply and ordering
The listing covers the Emissivity Measurement Apparatus with test and black plates, heaters, sensors, variacs, meters and enclosure. The user provides a table and a 220 V supply. Accessories, spares and quantities are confirmed on the quotation.
MOQ, lead time and packing are confirmed on each quotation for the quantity and the delivery destination. Single set-ups and complete heat transfer laboratories for engineering colleges, polytechnics and ITIs, including tender orders, are supplied.
Frequently asked questions
Why are two plates used?
The black plate is identical to the test plate except for its surface, so at equal temperature the difference in heat input is due to emissivity.
How are the plate temperatures matched?
Each heater has its own variac, and the inputs are read on a digital voltmeter and ammeter.
What supply is needed?
Single-phase 220 V AC, 4 A.
Related products
- Stefan Boltzmann Apparatus
- Heat Transfer In Natural Convection
- Heat Transfer Through Composite Wall
- Thermal Conductivity of Insulating Powder
See the complete heat transfer lab equipment range from JaincoLab for conduction, convection, radiation and heat exchangers.
Request a quote
For a quotation on the Emissivity Measurement Apparatus, send the quantity, any optional items and the delivery destination through the JaincoLab contact page or email [email protected] with SKU JA-HTLE-7377. Tender and project enquiries can be sent through the tenders page.
