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Std Furnace Controllers

Instruction Manual

Before starting the controller

  1. Install the power rack on a flat surface, at about 4 or 5 m distance from the furnace.
  2. Connect to the furnace the vacuum gauge, the two thermocouples, the power supply of the heater. The water safety device has to be plugged to the distribution board of the experimental setup. Plug the control unit on to a 230 V/16 A socket, check that the white indicator light is on.
    Note: all connectors are different to avoid any inversion.
  3. It is mandatory to plug the primary vacuum pump to the main power socket for fully automatic usage. Leave the power switch of the pump « ON ».
  4. Fix the sample at the end of the stick and check that extremities of the 2 temperature sensors are in place in the sample holder to ensure reliable measurements.
  5. Insert gently the stick inside the furnace through the top flange. Attention : never force the insertion but turn gently the stick while introducing it into the furnace.
  6. Once the stick in place, lock the flange without forcing.

Automatic controller operation

  1. Check that the white indicator « Plugged In » is on. Turn the switch « Power on » to power the rack.
  2. Wait until the initialisation of the controller is completed.
  3. Enter a low-temperature setpoint from the computer for testing the communication. If the communication is operational, enter a 0°C setpoint.
  4. Turn the switch on Vacuum position to start pumping. The primary and secondary pumps will start one after the other automatically. The secondary pump starts once a vacuum of 10-2 mbar is reached.
  5. If the « General Fault » red indicator is on after powering the rack, press « Fault Acknowledgment » to cancel the alarm.
  6. If all red indicators are switched off, the temperature controller is ready and waits for a setpoint.
  7. If one of the red indicators is on with « General Fault », press « Fault Acknowledgment » to cancel the alarm. If that is impossible, analyse the origin of the fault.
  8. A green indicator « Heater On » switched on means that the pressure is below 10-2 mbar. The controller start heating if a setpoint was entered.

Manual controller operation

Same procedure as before except that the « setpoint » is entered manually using the Up/Down buttons of the main controller (sample controller).

Stop the controller

  1. Enter a setpoint of « 0°C ».
  2. Actuate the switch on « Room Pressure » and wait for the automatic back fill of the outer vessel. The following conditions are required: the temperature inside the furnace must be lower than 150°C and a 10mn delay is applied to protect the turbo-molecular pump.
  3. Attention, the orange indicator « At Room Pressure » remains switched only during « 10mn », i.e. only during the back fill.
  4. When the orange indicator « At Room Pressure » is switched off, the valve is closed and the outer vessel is isolated.
  5. The pressure inside the furnace is displayed on the sample controller. Please check it before trying to unlock the sample stick.
  6. REMOVE CAREFULLY THE SAMPLE STICK. When removing the stick, never force but gently rotate the stick and maintain it vertically.

Informations regarding the synoptic

  • Plugged In : White indicator, powered rack.
  • Emergency Stop : Red press button, stop the whole rack immediately. Ne pas utiliser pour des « arrêts normaux », s’utilise qu’en cas d’urgence.
  • General fault : Red indicator, switched on each time a default is detected except a Vacuum Fault.
  • Fault acknowledgement : Yellow press button used to acknowledge General Fault.
  • Power On : Switch on the cabinet.
  • Power Off : Switch off the cabinet.
  • Lamps test : Black press button used to test the indicators, except the white « Plugged In » indicator.
  • Vacuum Fault : Red indicator indicating a failure or unexpected stop of the turbo pump. The heater is not shut down immediately. The furnace continues to heat the sample as long as the vacuum pressure remains greater than 10-2 mbar. If the secondary pump restarts, the indicator remains on during « 17s » and the default disappears if the pressure remained below 10-2 mbar. The « General Fault » indicator not being associated to the « Vacuum Fault », it will not be switched on and it is therefore not necessary to acknowledge it.
  • Water Cooling Fault : Red indicator telling that the water cooling function is not operated as expected.
    • Water cooling stopped for less than 5s; nothing happens.
    • Water cooling stopped for more than 5s but less than 2mn 30 s, the red light « Cooling Fault » is switched on and « Cooling Fault » is displayed on the controller. Heating is halted. If the water cooling restarts before 2mn 30s, the operation of the furnace is restarted automatically with the displayed setpoint.
    • Star cooling stopped for more than 2mn 30s, red indicators « Cooling Fault »  and  « General Fault »  are switched on. Look for the origin of the failure and fix it. Then, press a long time the button « Fault acknowledgement » to clear the fault so that the operation of the furnace restarts with the displayed setpoint.
  • Electrical Insulation Fault : red indicator telling that there is a leak to the ground of the furnace having an impedance lower than 1 K.ohms.
  • Furnace temperature limit : red indicator telling that…
    • there is no thermocouple plugged to the sample stick
    • the thermocouple is broken, and a « S.br. » message is displayed on the controller (Sensor Break)
    • the temperature overshot the maximum allowed temperature of the furnace.
  • Sample temperature limit : red indicator telling that…
    • there is no thermocouple plugged to the sample stick
    • the thermocouple is broken, and a « sample temp. lim » message is displayed on the controller, followed by a « S.br. » message after pressing the « Fault Acknowledgment » button (Sensor Break)
    • the temperature overshot the maximum allowed temperature of the sample.
  • Low Power : green light indicating that the low-power mode was automatically selected (setpoint below 423°C).
  • High Power : green light indicating that the high-power mode was automatically selected (setpoint above 423°C).
  • Heater : green light indicating that the heater is ready waiting for a setpoint or in operation, see displayed temperatures on the controller.
  • Vacuum : switch actuated to evacuate automatically the furnace with the primary and secondary pumps, threshold of 5.10-1 mbar.
  • Primary Pump : green light indicating that the primary pump is running.
  • Primary Vacuum : green light indicating that the threshold of 5.10-1mbar required by the turbo pump is reached.
  • Secondary Pump : green light indicating that the secondary turbo pump is running, the nominal speed of 2 7000 rpm being reached.
  • Room Pressure : switch actuated to back fill the furnace once the temperature is below 150°C and the delay of « 10mn » necessary to stop the turbo pump is passed.
  • At Room Pressure : orange light indicating that an automatic back fill is requested. Attention, this light remains switched on during the « 10mn » delay of the turbo pump.

Informations regarding controllers

  • Sample Controller display
    • Furnace code indicating which PID parameters are used.
    • Sample temperature in °C.
    • Pressure in the furnace vessel in mbar.
    • Temperature set point that can be entered manually with Up/Down keys.
    • Bar graphs indicating the output power (OP) and the temperature.
    • Indicators specify the functioning of the heating, the selected power mode and the vacuum state.
    • In case of water cooling fault lasting more than « 5s », « Cooling Fault » is prompted to the screen (press Page and Rotation keys simultaneously to cancel).
    • Pressing the Rotation key once displays the maximum temperature setpoint and the temperature of the controller.
    • Pressing the Rotation key a second time returns back to the display of the setpoint.
    • In case of error encountered with the temperature measurement, « Sample temp. lim » is displayed. If the fault persists after pressing the « Fault Acknowledgment » button, « S.br » is displayed until the issue is solved (Sensor Break).
  • Furnace Temperature Limit
    • Maximum furnace operating temperature in °C
    • Sample temperature in °C
    • In case of error encountered with the temperature measurement, « S.br » blinks until the issue is solved (Sensor Break).
  • Power Controller
    • Instant power consomption in Watts
    • Instant voltage and current amplitudes in V and A. 
  • Insulation Controller
    • Heating element insulation measured in K.ohms
    • Heating element primary voltage in V.