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1500°C Tube Furnace
4. Operate the furnace to a stable 500°C temperature setpoint.
5. Make temperature setpoint to 700°C to cause full amp draw on elements.
6. Measure and record the Amps at ONE Element. An Amp Clamp around the braided
strap for each element would be an appropriate measuring location.
7. Measure and record the Volts at EACH Element. A Voltmeter Probe on the braided
strap of each end of the SAME element would be appropriate measuring locations.
8. Select a low temperature setpoint to cool the furnace.
9. Replace the Element Terminal Covers onto the Furnace Cabinet.
10. Complete the following mathematical formula to determine the individual Element
Resistance.
Ve1 = Voltage at Element 1
Ae = Amperes at Element
Used in formula, Ve1 / Ae = Re1
Re1 = Resistance at Element 1
For example:
Ve1 = 30 and Ae = 25
Therefore, Ve1 / Ae = Re1 and 30 125 = 1.2 Ohms Resistance for Element 1
Apply the other Element Voltage measurements to the same formula to obtain the
corresponding Resistance for the additional Elements.
VeX = Voltage at Element X
Ae = Amperes at Element
Used in formula, VeX / Ae = ReX
ReX = Resistance at Element X
Additional Calculations can be made to identify the Amps (Current) for EACH Element
VeX / ReX = AeX
From example above:
Ve1 = 30 and Re1 = 1.2 Ohms
Therefore, Ve1 / Re1 = Ae1 and 30 /1.2 = 25 Amps (Current) for Element 1
Maintenance & Cleaning |
Chapter 10
305435H03 | 10-87
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