1700°C 1800°C HTF & RHF Chamber Furnaces

This range comprises the following models: RHF 1700°C with chamber capacities of 3.4, 10 and 25 litres; HTF 1800°C with chamber capacities of 3.4, 14.5 and 27 litres and the HTC 1800°C with a chamber capacity of 7.7 litres.

All models (excluding the HTC) feature lightweight fibre insulation, which allows rapid heating and cooling, but requires more care when loading to avoid accidental or abrasion damage. The HTC has a hard refractory brick lined chamber which provides a durable work area and excellent abrasion resistance, but reduces the heating and cooling rates.

Heating in all models is provided by molybdenum disilicide elements, which are known as Kanthal Super Elements. They comprise molybdenum disilicide (MoSi₂) and a component that which forms a dense protecting layer of glass around it at working temperature. This feature is the key to the superior properties of the Kanthal Super. The elements can be used continuously or intermittently and can either be used in air or with the usual protective gases. As Kanthal Super Elements do not increase in resistance with use, there is no need for a voltage reserve. Should an element fail it may be replaced without affecting other elements in the same circuit. Long life combined with ease of replacement contributes to a high degree of usage and low maintenance costs. The 'U' shaped elements, which are mounted on either side of the chamber (the HTF 18/27 also has elements located in the back of the chamber), are controlled using a sophisticated control circuit to meet with European EMC legislation.

The upward motion of the door keeps the hot face away from the operator, which is critical when working at such high temperatures, and allows easy and full access to the chamber. The RHF 3 and 10 litre capacity models are offered with a choice of either manually or electrically operated door, whereas other models are available with an electrically operated door only; the HTF 18/27 model offers a manual door only. The gentle closure of the electric door protects both the heating elements and delicate loads from possible impact damage.

A cool outer case temperature is maintained by electric fans which accelerate the movement of air in the gap between the insulation and the outer case.

Adjustable overtemperature protection is fitted as standard. An additional thermocouple and controller are linked to a contactor. The system can be set to protect the furnace or adjusted to a lower temperature to protect a valuable furnace load.