Installation, Operation & Maintenance Instructions Annealing Ovens TLD models This manual is for the guidance of operators of the above Carbolite products and should be read before the oven is connected to the electricity supply. CONTENTS Section 1.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.
TLD 1.0 SYMBOLS & WARNINGS 1.1 Switches and Lights Instrument switch: when the instrument switch is operated the temperature control circuit is energised. 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 an oven may be hot. DANGER – read any warning printed by this symbol. 1.
TLD 2.0 INSTALLATION 2.1 Unpacking & Handling Lift the unit by its base. Do not use the door or any other projecting cover or component to support the equipment when moving it. Use two people to carry the oven where possible. Remove any packing material from the inner chamber before use. NOTE: This product contains Refractory Ceramic Fibre (better described as Alumino Silicate Wool) for precautions and advice in handling this material see the ‘Repairs and Replacements’ section. 2.
TLD 3.0 OPERATING INSTRUCTIONS 3.1 Operating Program The program consists of the stages shown in the graph below. The rates of temperature rise, dwell temperature and dwell times are all adjustable by the user. The general format of the program is installed at the manufacturing stage, with initial values as shown in the table below. 3 4 2 5 6 1 7 initial setting program 1 2 function Start. Heat at a controlled rate. heat up at 480°C/hour to 300°C 3 Dwell for a preset period.
TLD To turn the oven off, set the Instrument switch to it’s off position; the controller display will go blank. If the oven is to be left off unattended, isolate it the electrical supply. 3.3 Overtemperature Control (if fitted) The overtemperature controller should typically be set at 15°C above the top temperature used by the main programmer. If an overtemperature condition occurs, always investigate the possibility that the main control system has failed.
TLD 4.0 MAINTENANCE 4.1 General Maintenance No routine maintenance is required other than the occasional replacement of consumable items. The oven 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. The fan motors are sealed for life; no lubrication is required. Lightweight ceramic fibre insulation can easily be marked by accidental contact.
TLD 5.0 REPAIRS & REPLACEMENTS 5.1 Safety Warning – Disconnection from Supply Always ensure that the oven is disconnected from the supply before repair work is carried out. 5.2 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.
TLD 5.6 Thermocouple Replacement Remove the front panel and the internal cover as necessary. Make a note of the thermocouple connections, and how the thermocouple is placed and fixed. Colour codings are: negative positive (type K) white green Disconnect the thermocouple from its controller terminals or terminal block. Re-assemble with the new thermocouple observing the colour coding. 5.7 Element Replacement Remove front panel and the internal cover as necessary and locate the element terminals.
TLD 6.0 FAULT ANALYSIS A. Oven Does Not Heat Up 1. The temperature controller is OFF 2. The temperature controller is ON B. Oven Overheats 1. Oven only heats up when the instrument switch is ON 2. Oven heats up when the instrument switch is OFF MF18 – 3.06 No power from the supply There are no lights glowing on the controller The controller shows a very high temperature or a code such as S.
TLD 7.0 CIRCUIT DIAGRAMS 7.1 Single Phase N L only if overtemperature control fitted F1 Filter PE relay or contactor F2 Instrument Switch e l e m e n t (s) circulation fan coil overtemp. controller thermocouple SSR temperature controller thermocouple alarm relay cooling fan 10 MF18 – 3.
TLD 8.0 FUSES & POWER SETTINGS 8.1 Fuses F1-F2: Refer to the circuit diagrams. 8.2 F1 Internal supply fuses Fitted if supply cable fitted. Fitted on board to some types of EMC filter. F2 Auxiliary circuit fuses Fitted on board to some types of EMC filter. May be omitted up to 25Amp/phase supply rating. Customer fuses Required if no supply cable fitted. Recommended if cable fitted.
9.0 SPECIFICATIONS 9.1 Carbolite reserves the right to change specifications without notice. Models Covered by this Manual MODEL Max. Max. Chamber Size (mm) Temp. Power (°C) (kW) H W D Ovens for thermoluminescent dosimeters TLD/3 400 1 150 150 150 TLD/28 400 2.25 305 305 305 9.2 Approx.
