This furnace was produced at the ILL, but is now commercially available at
AS Scientific Products Ltd
. The heater
consists of a double tube of noibium foil, and there are up to 8 radiation
screens. These screens help to have a small temperature gradient over the
sample. The drawback is, that at lower temperatures the cooling is very
weak, and therefore the control difficult.
The furnace is back from repair at AS Scientific Products Ltd and operational. The screens are now in a modified design, which allows an easier replacement of the heater element. But even with this new design, a repair will take a lot of time.
When heating up the furnace the first time, ramp up slowly, using the appropriate max. power for the temperature range. The pid values from a first test (values in parentheses) were not confirm in a later experiment.
| temperature | max. power | prop | int | ramp |
|---|---|---|---|---|
| 1500 ... 1800 | 2000 | (50) 10 | (50) 5 | 20 |
| 1300 ... 1500 | 1000 | (100) | (50) | 20 |
| 1100 ... 1300 | 500 | (200) | (50) | 20 |
| 900 ... 1100 | 316 | (200) | (50) | 10 |
| 700 ... 900 | 158 | (100) | (20) | 5 |
| 600 ... 700 | 158 | (100) | (1) | 5 |
| 500 ... 600 | 158 | (50) | (1) | 5 |
