5
Introduction
Intended Use
The type 21100 furnaces are small, inexpensive furnaces
ideally suited for school, chemical and industrial laborato-
ries. They are intended for applications requiring temper-
atures up to 1100°C for manual control bases or temper-
atures up to 1200°C for the electronic single set point
control bases. See specification sheet for continuous and
intermittent operating temperatures.
General Usage
Do not use this product for anything other than its intend-
ed usage.
Principles of Operation
The furnace chamber is heated by heating elements em-
bedded in a refractory material. The tubular chamber is
insulated with a ceramic fiber insulation. The furnace
chamber is supported by the control base which also
houses the electrical connections. Two types of controls
are used:
1. Manual Control - A percentage input control which
compensates for line voltage fluctuation and ambient
temperature changes. The temperature is measured by a
thermocouple and is displayed on a pyrometer.
2. Single Set Point Control - An electronic control which
enables the user to bring the furnace up to a pre-set tem-
perature and hold the temperature.
Introduction