Pyrometers are very useful for monitoring manually fired kilns. L&L used to sell only analog pyrometers (now we sell only digital pyrometers). An analog pyrometer has a needle and a printed scale under the needle to interpret the needle's position. Most clay and glazes will mature over at least two cone numbers and these pyrometers are at least that accurate. In time however, they loose their accuracy. They can be calibrated by using a large cone visible in the kiln. Compare the pyrometer reading when the cone melts to a cone table temperature equivalent for that cone number and adjust the calibration screw on the front of the pyrometer accordingly. We now only sell digital pyrometers now because of their superior accuracy.
Tru-View Pyrometer System
L&L's TRU-VIEW pyrometer systems can have as many as five thermocouples connected to them. The pyrometer can only read one at a time, though, so a thermocouple selector switch is wired into the yellow side of the TC circuits. The TC selector switch that was originally used was replaced by the one currently in use. The new one is a simple 12 position switch. The trick when working on these is to use a continuity tester to match the lead in question on the inside to the position of the knob on the outside. For example, the knob may point to “TC 1” on the label. On the inside there is only one lead from the switch that corresponds to TC 1. If you do not connect that lead to TC