Installation, Operation & Maintenance Instructions 1200°C Thermocouple Calibration Furnace type PTC 12/20/150 This manual is for the guidance of operators of the above Carbolite products and should be read before the furnace is connected to the electricity supply. CONTENTS section 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.
PTC 1.0 SYMBOLS & WARNINGS 1.1 Switches and Lights Instrument switch: when the instrument switch is operated the temperature control circuit is energised. Heat Light: the adjacent light glows or flashes to indicate that power is being supplied to the elements 1.2 Warning Symbols DANGER of electrical shock– read any warning printed by this symbol. DANGER – hot surface. Read any warning printed by this symbol. WARNING: all surfaces of a furnace may be hot.
PTC 2.0 INSTALLATION 2.1 Unpacking Unpack the furnace and remove the transit clamp from the working end of the furnace as follows: - loosen the locking nut on the central clamp bolt; - turn the bolt clockwise with a screwdriver to release the force on the clamping device; - remove the two screws which hold the transit clamp to the furnace; - carefully withdraw the transit clamp; - retain the clamp.
PTC 3.0 OPERATING INSTRUCTIONS 3.1 Operating Cycle The furnace is fitted with an instrument switch. The switch cuts off power to the controller. Connect the furnace to the electrical supply. Operate the instrument switch to activate the temperature controller. The controller becomes illuminated and goes through a short test cycle. Set the temperature as required - see section 4.0.
PTC diameter is 7.5mm - larger diameters may experience too much heat conduction and give an incorrect calibration. Insert the thermocouple and end plug and support the cold end to ensure that the assembly lines up with the axis of the furnace tube. Switch on the instrument switch and set the desired temperature on the controller. Allow the unit to warm up and stabilise.
PTC 4.0 CONTROLLER OPERATION 4.1 Eurotherm 2132 When switched on, the controller lights up, goes through a short test routine, and then displays the measured temperature and starts to control. The output light glows or flashes as heating occurs. The Page key allows access to parameter lists within the controller; most lists and parameters are hidden and cannot be accessed by the operator because they contain factory-set parameters which should not be changed.
PTC 4.5 Altering the Ramp Rate It is possible to limit the rate of heating by setting a ramp rate only if the timer feature is not in use. To enable direct setting of the ramp rate, first ensure that the StAt parameter and dwEl parameter are both set to OFF (see sections 4.8 and 4.9). Press Scroll until the legend SPrr (SetPoint ramp rate) is displayed. Use Down or Up to display and adjust the value. The ramp rate sets the maximum rate of heating or cooling in degrees per minute.
PTC 4.7 Operation With the Timer The 2132 can be used as a process timer allowing timed heating or timed delay, according to the options in the table. There are 5 timer modes, but 2 of them are affected by whether the setpoint ramp rate feature is being used, making 7 entries in the table. The table also shows the status of the Timer Light on the 2132. A visual impression of the different modes is given in fig 3.
PTC 4.8 Setting the Timer Mode Scroll to tm.OP; use or to view and alter the mode. The mode shows as OPt.1 to OPt.5. It is not possible to alter the mode while the timer is running; if the mode cannot be altered, scroll to the StAt parameter and set its value to OFF. 4.9 Setting the Time Period Method 1 Scroll to tmr (time remaining). Use or to view the remaining time; the units are always in minutes. Use and to set or alter the time.
PTC 4.11 Stopping the Timer To stop the timer at any time while it is running, change the StAt parameter to OFF. This is the same as reducing tmr to zero. The controller then acts as though at has reached the end of the time period. 4.12 End of Time Period Modes 1 and 3: heating stops at the end of timing; the m-A parameter changes to mAn. Modes 2 and 4: heating continues at the end of timing; the m-A parameter remains at Auto.
PTC 5.0 MAINTENANCE 5.1 General Maintenance No routine maintenance is required other than the occasional replacement of consumable items. The furnace outer surface may be cleaned with a damp cloth. Do not allow water to enter the interior of the case. Do not clean with organic solvents. 5.2 Controller Calibration After prolonged use the controller and/or thermocouple could require recalibration.
PTC 6.0 REPAIRS & REPLACEMENTS 6.1 Safety Warning – Disconnection from Supply Always ensure that the furnace is disconnected from the supply before repair work is carried out. 6.2 Safety Warning - Refractory Fibrous Insulation Insulation made from High Temperature Insulation Wool Refractory Ceramic Fibre, (better described as Alumino Silicate Wool) (ASW) This product contains alumino silicate wool products in its thermal insulation.
PTC 6.5 Thermocouple Replacement Disconnect the furnace from the supply, and remove the furnace back panel (opposite the working end). Make a note of the thermocouple positions; the 3mm upper thermocouple is the control thermocouple; the 1.5mm entering in the centre is the reference. Disconnect the thermocouple to be replaced from its terminal block and withdraw it.
PTC 7.0 FAULT ANALYSIS A. Furnace Does Not Heat Up 1. The HEAT light The heating element has failed is ON 2. The HEAT light is OFF Check also that the SSR is working correctly The controller shows a very high temperature or a code such as S.
PTC 8.0 CIRCUIT DIAGRAM 8.1 Circuit Diagram N L PE Supply Fuses Protection Fuse Instrument Switch temperature indicator temperature controller heat on thermocouple e l e m e n t voltage change switch (shown in 230V position) e l e m e n t SSR thermocouple 9.0 FUSES & POWER CONTROL 9.1 Fuses Supply Fuses: 32mm x 6mm type F1 (quick blow)10 Amp. Access by removal of the furnace back panel. Protection Fuse: 20mm x 5mm type FF (ultra rapid) 10 Amp.
10.0 SPECIFICATIONS Carbolite reserves the right to change specifications without notice. 10.1 Models Covered by this Manual MODEL Max. Temp Max. Power (°C) (kW) Thermocouple Calibration furnace PTC 12/20/150 1200°C 1.2 Work Tube Bore (mm) Work Tube Length (mm) Net Weight 25 195 9 (kg) 10.
