operation manual chapter “Replacing the heating elements”. If you want to be sure that
the heating elements are broken, then measure the voltage on the wires to the heating
elements.
: Measuring the voltage
– If the voltage is 230VAC heating elements but the furnace is cold, the heating elements
are broken. See chapter “The resistance furnace is completely cold or too hot”.
- In case the “Set point” is shown correctly but the “Furnace temperature” shows “-1”
without any other following digits, the thermocouple is defective (interrupted). Replace the
thermocouple. See chapter “Thermocouple replacement”.
Bad combustion:
– The furnace temperature is too low, see chapters “Resistance furnace doesn’t reach
full temperature” and “The resistance furnace is too cold or too hot.”
– The sample contains a substance that doesn’t burn easily.
Some materials contain sulfur compounds which are very difficult to burn, i.e. they need
higher temperature than 1550°C to properly burn in a reasonable time.
An improvement can be achieved by adding accelerators, such as iron phosphate to
coal samples that contain pyrites, or vanadium pentoxide to cement samples.
For materials which require such high temperatures to burn, we recommend induction
furnace analysis.
– No oxygen flow, see chapter “No oxygen flow”
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