MagnaCoil™ - High Temperature Coil Heating Element
Metal-like Mechanical Properties. Not Brittle.
Maximum Surface Temperature 1450°C which cannot be exceeded. A pyrometer in a free radiating condition or pyrometer and thermocouple in an enclosed condition is recommended for use if operating above 1200°C in order to prevent inadvertent burn out. The use of MHI controls is highly recommended. Use beyond 1400°C surface temperature is life limiting.
Simple power and voltage calculator for the patented MagnaCoil™ is given below. Note that free radiating and enclosed heating objectives have different power demands.
The power of a MagnaCoil™ depends on the Diameter Di and N the number of turns. Note that N is not an integer for IMC or some MC models.
Maximum Power = (50-25) N P Di Watts (Di in inches). The range depends on the enclosure used. Highest power for unenclosed (free radiating) as Power is the objective in a free radiating condition. Providing an enclosure changes the objective to temperature instead of power. As the temperature is achieved the power demand equals loss of power from the enclosure and P =3.1-3.2. See also radiation page.
Maximum Voltage V= N P Di/(2-3) Volts, Di in inches. The range depends on the enclosure used.
Maximum MagnaCoil Surface temperature is 1450°C. Use beyond 1400°C is life limiting
Free radiatng power is the power dissipated by the coil wheen there is no surrounding refractory enclosure.
The use of a insulating (refractory) shell around the coil
will change this number depending on the type of refratory used.
A surrounding encosure will reduce the power will not impact the voltage as much.
Vertical configuations and/or stress wmay reduce the use-temperature.
CHS-OD or equivalent spacers recomended when creep deformation is possible.
Note that coil temperature and environment temperatures will be different.
A feedback controller is highly recomended for managing the coil temperature. For small coils
a BPAN controller is recommended.
Coil temperature best measured with a pyrometer with feedback control BPAN.