These units have a maximum operating temperature of 1200°C, 1500°C and 1600°C.
For units at 1200°C, heating is via an integral 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. Temperature uniformity Temperature variation within the uniform zone is typically +5°C, with a significant proportion of the uniform zone length within +1°C. To improve the uniform zone length within a tube furnace, it is necessary to use multi-zone furnaces; the usual configuration is 3 zones. Temperature uniformity is dependent on the tube diameter and heated length. |  |
| Model (1200°C models) | PTF 12/38/500 | PTF 12/50/610 | PTF 12/75/710 | PTF 12/100/910 |
| Maximum temperature (°C) | 1200 | 1200 | 1200 | 1200 |
| Maximum continuous temperature (°C) | 1150 | 1150 | 1150 | 1150 |
| Tube inside diameter (mm) | 38 | 50 | 75 | 100 |
| Heated length (mm) | 500 | 610 | 750 | 940 |
| Maximum power (kW) | 1.5 | 2.0 | 2.75 | 4.2 |
| External dimensions including console (mm - h x l x d) | 565 x 56 x 300 | 565 x 670 x300 | 565 x 810 x 300 | 625 x 1000 x 400 |
| Work tube length : ID x length (mm) | 25 x 750 | 38 x 900 | 60 x 1000 | 75 x 1500 |
| Model (1500°C & 1600°C models) | PTF 15/50/450 | PTF 15/75/450 | PTF 15/50/610 | PTF 15/75/610 | PTF 16/50/450 | PTF 16/75/450 | PTF 16/50/ 610 | PTF 16/75/610 |
| Maximum temperature (°C) | 1500 | 1500 | 1500 | 1500 | 1600 | 1600 | 1600 | 1600 |
| Maximum continuous temperature (°C) | 1450 | 1450 | 1450 | 1450 | 1550 | 1550 | 1550 | 1550 |
| Tube inside diameter (mm) | 50 | 75 | 50 | 75 | 50 | 75 | 50 | 75 |
| Heated length (mm) | 450 | 450 | 610 | 610 | 450 | 450 | 610 | 610 |
| Maximum power (kW) | 5.0 | 5.0 | 8.0 | 8.0 | 6.0 | 6.0 | 9.2 | 9.2 |
| External dimensions including console (mm - h x l x d) | 640 830 420 | 640 830 420 | 640 1130 420 | 640 1130 420 | 640 830 420 | 640 830 420 | 640 1130 420 | 640 1130 420 |
| Work tubes : ID x length (mm) Short Long | 50 x 900 50 x 1200 | 75 x 900 75 x 1200 | 50 x 1200 50 x 1500 | 75 x 1200 75 x 1500 | 50 x 900 50 x 1200 | 75 x 900 75 x 1200 | 50 x 1200 50 x 1500 | 75 x 1200 75 x 1500 |
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