HTRH-GR – Graphite Tube Furnace

Description

This range of cold wall tube furnaces is heated by graphite elements and insulated by graphite felt. At higher temperatures above 400 to 600°C graphite is air sensitive and needs to be kept under either an inert gas or vacuum atmosphere. To maintain an oxygen free environment, the tube furnace is contained within in a water-cooled vacuum tight vessel sealed with rubber O-rings, which needs to be evacuated and purged with inert gas prior to heating.

The thermal conductivity of graphite felt insulation is very low making it an excellent material for furnace insulation. The thickness and quality of the insulation materials are specifically chosen depending on the maximum operating temperature of the furnace.

  Standard features
•  2200, 2400 or 2600°C maximum operating temperature
•  Automatic gas valves with manual flowmeter for one inert gas
•  Closed flanges during heat treatment mandatory
•  Eurotherm 3508P1 programmer
•  Graphite heating and insulation
•  Heated length of 260 mm
•  Leakage rate (clean, cold, dry and empty) < 5 x 10^-3 mbar l/s
•  Over-temperature protection
•  Pyrometer for temperature measurement
•  Semi-automatic control with Siemens KP 300 panel
•  Single stage rotary vane pump
•  Water cooled vessel (cooling water provided by customer)

  Options (specify these at time of order)
•  Adjustable angle stand
•  Control panel TP1900 or WinCC for PLC
•  Double stage rotary and turbo pumps
•  Full automated control by Siemens PLC S7-300
•  Further inert gas controls (manual or automated)
•  Reference pyrometer (only with PLC)
•  Special flanges with inert gas counter flow for open operation during heat treatment
•  Sliding thermocouple for accurate temperature control under 1500°C
•  Water cooling chiller (if cooling water is not available)