Emissivity Measurement Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-EMA-7377
Jlab Export is a leading Emissivity Measurement Apparatus Manufacturer,and suppliers in India
Emissivity Measurement Apparatus (code EL-EMA-7377) is a radiation set-up that 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 fed from its own variac, and both stand on brackets inside a wooden enclosure with one glass side. The two-plate apparatus is made in Ambala, India, by JLab.
Specifications
| Parameter | Detail |
|---|---|
| Plates | Test plate and black plate, identical; black plate surface blackened |
| Plate construction | Mica heater sandwiched between two circular plates |
| Mounting | Individual brackets in a wooden enclosure with one glass side |
| Heater supply | Separate variac for each plate |
| Power measurement | Digital voltmeter and digital ammeter |
| Temperature sensors | On each plate and for the surroundings |
| Electricity supply | 1 phase, 220 V AC, 4 A |
| Also needed | Table for set-up support |
| Quality check | Each apparatus is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 14–18 working days |
| Product code | EL-EMA-7377 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How the Two Plates Are Compared
The two variacs are adjusted until the test plate and the black plate settle at the same temperature. Because the plates match in material, size and temperature, they lose the same heat by convection, and any difference in electrical input, read on the digital voltmeter and ammeter, is the difference in radiation. Treating the blackened plate as a black body (ε = 1), its extra input is Wb − Wp = (1 − εp) σ A (T⁴ − Ta⁴), so εp = 1 − (Wb − Wp) / [σ A (T⁴ − Ta⁴)]. Here T and Ta are the plate and surrounding temperatures in kelvin, A is the radiating area of one plate and σ is the Stefan-Boltzmann constant.
Emissivity Against Absolute Temperature
Repeating the balance at higher variac settings gives εp at several plate temperatures. Plotting it against absolute temperature, one of the two experiments, shows how the emissivity of the test surface changes as it gets hotter. The wooden enclosure and its glass side keep the surrounding air steady between readings, so the convection losses of the two plates stay equal.
Other Radiation and Convection Apparatus
- Stefan Boltzmann Apparatus — finds the Stefan-Boltzmann constant with a copper disc in a heated hemisphere.
- Combined Convection and Radiation — a heated cylinder in a vertical air duct, with a fan at its base.
- Heat Transfer In Natural Convection — uses a polished brass tube to keep radiation losses low.
It is part of the Emissivity Measurement Apparatus category under Heat Transfer Lab Equipment.
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Last updated: 30 October 2026