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4.2 Data Collection
A power and energy analyser from Chauvin Arnoux was used for the instantaneous electricity
measurements. The logged phase current was measured with electricity tongs from Chauvin
Arnoux. The equipment has a margin of error of 0-3%. The logging was conducted during
three periods to be able to measure most of the process equipment. The logging periods were:
16-23
th
of January, 24-30
th
of January and 1-6
th
of February. An additional measurement
period for the manual equipment was conducted during one weekend 2-5
th
of March. Eleven
electricity tongs were used for the measurements and the phase current was measured once
every minute. The software DataView was used to handle the data from the tongs.
The gas flows to the furnaces were provided by Thomas Grivander, Bodycote
Värmebehandling AB. The temperature of the gas flow leaving the furnace was measured
with a thermocouple. The surface temperatures of the furnaces were measured with a Testo
thermo camera.
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