Laboratory Tube Furnaces For laboratory processes requiring the use of a tube furnace, Lenton offers a variety of tube diameters and lengths to meet most heat processing requirements. The tube furnace cases are manufactured from polished stainless steel with an outer enamelled mesh cover, which allows natural air cooling for maximum operating safety and comfort. All models are supplied horizontally as standard, but vertical options are also available. Optional fittings include: > A wide range of tubes > Insulating end plugs to minimise heat loss and thermal gradients > Gas tight end fittings for work in controlled atmospheres > For increased uniform temperature zone length, three zone versions are available – see the PTF range

Model LTF 12

Model LTF 12 This range of furnaces has a maximum operating temperature of 1200°C. Heating is provided by a resistance wire element wound on to the ceramic work tube which is an integral part of the furnace. Low thermal mass insulation is used throughout for rapid response rates and maximum thermal efficiency and stability. A rugged metal sheathed thermocouple is protected from accidental damage and allows full use of the work tube bore. If the tube is for use with an atmosphere or is likely to be contaminated by spillage, a separate worktube is required. Horizontal models are supplied as standard with the controls in the base. Vertical versions are available at extra cost, which have a separate console.

Models LTF 14, 15 and 16

Models LTF 14, 15 and 16- These models have a maximum operating temperature of 1400°C, 1500°C and 1600°C. Heating is provided by silicon carbide rod elements which are mounted parallel to the worktube; the worktube must be ordered separately. These elements radiate heat directly onto the tube for rapid response rates. Low thermal mass insulation is used throughout for maximum thermal efficiency and stability. Horizontal models are supplied as standard with the controls in the base. Vertical versions are available at extra cost, which have a separate console.

High Temperature Tube Furnaces

Models LTF 17 and LTF 18 > maximum operating temperatures 1700°C and 1800°C These furnaces are constructed using high grade insulation materials throughout for rapid response rates and maximum thermal efficiency and stability. Heating is provided by vertically suspended molybdenum disilicide elements.

Three-zone Tube Furnaces

Models PTF 12, 15 and 16 These units have a maximum operating temperature of 1200°C, 1500°C and 1600°C. For units at 1200°C, heating is by a resistance wire element wound on to the ceramic work tube which is an integral part of the furnace. At 1500°C and 1600°C, silicon carbide rod elements are mounted parallel to the tube. The end zone controllers are coupled to a centre zone thermocouple enabling the centre zone temperatures to be closely linked. This system provides a longer uniform zone temperature than that achieved by the use of single zone furnace of the same length. Independent control of each zone is also available. Horizontal models are supplied as standard with the controls in the base. Vertical versions are available at extra cost, which have a separate console.

Split Tube Furnaces

These furnaces are ideal for processes requiring in-line heating for when rapid heating/cooling is essential.

Model CSC12

maximum operating temperature 1200°C > spiral wire heating coils in low thermal mass insulation > split design for easy exchange of work tubes

Model CSC17

maximum operating temperature 1700°C > molybdenum disilicide heating elements > 3 sizes, the largest floor standing

Vacuum Tube Furnaces

The high specification VTTF series of horizontal vacuum tube furnaces is available at 1200°C and 1500°C. Standard Features > Vacuum vessel – ceramic tube fitted with Stainless Steel end seals; > Rotary pump – two stage sliding vane type; > Turbo-molecular vacuum pump; > Manually operated backing/roughing and baffle valve; > Pirani gauge – low vacuum monitoring; > Penning gauge – high vacuum monitoring; > Ultimate vacuum – better than 1 x 10-5mbar, with clean empty work tube.