KILNS & FURNACES
Electric in air to 1800°C • Research • Heat treatment
Controlled atmosphere • Melting • Gas, Natural/LPG to 2300°C
Tetlow Kiln Pty. Ltd. ABN: 26 166 832 300 54 Howleys Road, Notting Hill, 3168 Victoria Australia
T: +61 3 8545 8296 F: +61 3 9544 2723 E: info@tetlow.com.au www.tetlow.com.au
It is standard to use a series of three cones for each firing, one cone indicating a
temperature of about 20⁰C below the temperature to which the ware is to be fired, one
cone indicating the required temperature and one cone indicating a temperature 20˚C
above the required one. In this way the collapse of the lower cone serves as a warning
that the temperature is rising to the point at which the second cone will collapse (at which
time the kiln should be switched off). The third cone serves as a guard to show potential
over-firing.
It is important to place the cones in some definite order, which is usually done by placing
the cones from left to right in order of increasing fusion point so that the cone on the
extreme right will be the last to go down. The fusion point of any cone will be indicated
when the cone bends over so that its tip bends down and touches the base on which the
cone is mounted. This is referred to as the end-point of the cone. If the temperature
continues to increase the cone will collapse further and eventually melt completely.
12.4 TEMPERATURE MEASURING INSTRUMENTS (PYROMETERS)
There are different types of temperature-measuring instruments, but the ones generally
used consist of a thermocouple attached by special compensating cables to an instrument,
which transforms the voltage fed into it from the thermocouple into degrees of temperature
indicated on a scale.
Tetlow Kilns use either the Shimaden SR92 Set Point Controller or the Stafford 316B
Programmable controller.
See detailed operations manuals for these instruments on our webpage
www.tetlow.com.au.
12.5 PRODUCTS
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