Range of temperature controllers

Transcription

1 Model teco Choosing the right temperature controller Water/oil direct/indirect cooling Range of temperature controllers

2 The problem of selection Choosing the right temperature controller The question of the correct temperature controller comes up again and again for plastics processors. What performance is required for temperature control of the individual tasks and the individual working area? What advantages and disadvan tages do the units offered have with respect to their different forms of construction? It is worthwhile to compare the temperature controllers available on the market in terms of their relevant equipment features. It is best to divide them into the various types of machine. This classification can be done according to the heat-transfer medium used, the temperature range, the construction, or the type of cooling. Finally, the allocation of the available options into the overall process plays a major role. Recognising the strengths and weaknesses of temperature controllers Beyond any doubt there is a suitable temperature controller for each task, and this one can best handle the task in question from the technical and economic points of view. It is simply not easy to make a se lection due to the large number and wide variety of units offered and also in view of the far-reaching consequences. In addi tion to the costs, the primary concerns are availability (little or no down-time), the service provided by the manufacturer, and the options for expansion and upgrading. In many cases the only thing that helps, is to obtain an exact matching of the performance data so as to be able to genuinely detect the strengths and weaknesses. The heat-transfer as the first criteria Fundamentally, it is necessary to decide whether to use water or heat-transfer oil. If the temperature range permits it, water is always to be preferred due to its far better heat transfer properties. The construction of water temperature controllers depends on the maximum operating temperature, as is shown in the following table. Division of water temperature controllers by temperature ranges It is possible to operate temperature controllers with an open circuit that is not under pressure over the lower temperature range up to 95 C. At higher tempera tures it is necessary to apply a pressure within closed systems so as to prevent evaporation. At especially high temperature levels, e.g., as encountered in the injection moulding of technical thermoplastics, precise and rapid heat transfer is required, and especially so for the production of precision parts. Since there is often only a very limited heating and cooling channel area available due to the fact that the moulds used are frequently very small, hot water equipment is in general more suited for such applications than temperature controllers using heat transfer oil. It is necessary to note the high saturation pressure of 16 bar at 200 C and the need for special hoses to connect the mould. Here, too, the advantages of water heavily outweigh those of oil in these individual cases. Temperature range from C to C Kind of operation brine open circuit, pressureless water 5 95 open circuit, pressureless pressurized water closed circuit, pressure 3.8 bar hot water closed circuit, (lower range) pressure 16 bar hot water closed circuit, (upper range) pressure 64 bar Model teco cs: Water temperature controllers with indirect cooling. Perfect Cooling and Temperature Control

3 Temperature controlling with heat transfer oil Oil temperature controllers are used in the temperature range from approx. 160 C to 350 C. Here, too, there are many different types, and their use depends on the temperature range. Units of the open type are offered for use up to 200 C. It should be noted with such units that the heating surface loading should be designed to be as low as possible to prevent thermal decomposition by exceeding the permissible film temperature as a result of local overheating at the heating element. Thermal decomposition of organic heat transfer liquids and the formation of carbon causes porous layers of hard carbon to be deposited on the surfaces of the heating elements. This causes a further reduction of the heat transfer and ultimately leads to a failure of the temperature controllers. Since the oil undergoes thermal decomposition at high temperatures, it is especially necessary to provide safety mea sures for all temperature controllers in the temperature range above 200 C. It is necessary to monitor the flow rate in such units so that the system is switched off if the flow falls below the minimum permissible figure. In addition, it is necessary to prevent the entry of oxygen into the system, otherwise this causes oxidisation damage to the heat transfer medium. Oxidisation appears in the form of a rapidly increasing viscosity of the heat transfer medium, which ultimately becomes unusable. It is necessary to provide expansion vessels with a cold oil or nitrogen overlay to prevent the entry of oxygen. When refilling or after the initial filling of the unit, it is first necessary to purge the heat transfer oil at a temperature of approx. 100 C over a longer period of time. A large number of legal regulations must be complied with by the manufacturer and the operator in the construction of the units and also when working with heat transfer oil. The type of cooling as the second criteria It is necessary to distinguish between direct and indirect cooling when looking at the type of cooling. Indirect cooling means a separation of the cooling water circuit from the circulating line. This separation is always done in oil temperature controllers, for example, since the heat taken up by the oil in the mould is drawn off into the cooling water by a heat exchanger. Indirect cooling is only provided for water temperature controllers if it is not possible to obtain sufficiently clean cooling water for direct cooling, and so it is necessary to prevent contamination of the circulating line. Contamination in the circulating line leads to reduced heat transfer and increases the risk of failures in the temperature control system. The advantages of direct cooling The disadvantage of indirect cooling is the temperature loss in the heat exchanger. For that reason we always provide direct cooling if a high cooling capacity with a low temperature difference between the cooling water and the circulating medium is required. In the case of direct cooling, the cooling water is fed into the circulating line without including a heat exchanger in the circuit. This always provides the maximum cooling capacity so that temperature changes are quickly brought about. Motor-driven valves or a multi-stage solenoid valve system are used to increase control accuracy. The prerequisite for the use of direct cooling is a closed cooling circuit with clean water so that the temperature control circuit is not contaminated. Model teco tt/th: Oil temperature controller up to 300 C/350 C

4 The most important facts gwk temperature controllers for water, using indirect cooling Type Medium Temperature Cooling Heating capacity Max. cooling Pump capacity range ( C) (kw) capacity (kw) max. (l/min / bar) teco cw 25 Water 0-25 indirect 4 60 / 3.8 teco cw 60 Water 0-25 indirect / 5.8 teco cs 90 Water 95 indirect / 3.8 teco cs 140 Water 140 indirect / 6 teco cs 160 Water 160 indirect / 6 teco 700 Water 95 indirect / 5.5 teco 800 Water 140 indirect / 6 teco 900 Water 95 indirect / 4.7 teco 1000 Water 140 indirect /6-200/5.2 teco wi 100 Water 150 indirect / 6 teco wi 150 Water 150 indirect / 5.1 teco wi 250 Water 150 indirect / 5.5 teco wi 400 Water 150 indirect / 3.6 teco wi 500 Water 150 indirect / 4.2 teco wh 60 Water 200 indirect / 5 teco wh 90 Water 200 indirect / 5 teco wh 120 Water 200 indirect / 5 gwk temperature controllers for water, with direct cooling Type Medium Temperature Cooling Heating capacity Max. cooling Pump capacity range ( C) (kw) capacity (kw) max. (l/min / bar) teco itc 60 Water 140 direct / 6 teco wd 100 Water 140 direct / 6 teco wd 150 Water 140 direct / 5.1 teco wd 250 Water 140 direct / 5.5 teco wd 400 Water 140 direct / 3.6 teco wd 500 Water 140 direct / 4.2 gwk temperature controllers for heat transfer oil Type Medium Temperature Cooling Heating capacity Max. cooling Pump capacity range ( C) (kw) capacity (kw) max. (l/min / bar) teco tt 60 Oil 300 indirect / 6.0 teco tt 100 Oil 300 indirect (80) / 8.0 (11.0) teco tt 140 Oil 300 indirect / 7.0 teco th 60 Oil 350 indirect / 6.0 teco th 100 Oil 350 indirect (80) / 8.0 (11.0) teco th 140 Oil 350 indirect / 7.0 Perfect Cooling and Temperature Control

5 Integration of temperature controllers into a pre-heating station for injection moulds. Integration into the overall process Since the temperature controller has a decisive effect on quality, it is logical to integrate its functions into the manufacturing process. In addition to precise control of the mould temperature, the monitoring and storage functions and com munica tions capability with the processing machine play a major role. Providing the temperature controller with a powerful microprocessor controller therefore represents a natural minimum requirement. All the process parameters should be entered and displayed at a central control panel. In this case the function and error displays are important components. The monitoring functions should include, as a minimum, tolerance band monitoring of the temperature actual value, set value limitation, electronic level monitoring with automatic water make-up and dry-running protection for pump and heating, and displaying the corresponding error messages or even switching off the unit. It is also necessary to pay attention to all the interfaces currently available on the market such as analogue and serial interfaces, the CAN-Bus, the Profibus and Euromap 66. Only in this way is it possible to ensure communication between various types of processing machines, since manufacturers of such equipment generally provide differing interfaces and interface protocols. Flow 25.2 l/min Set value 40 C T outlet 40 C T inlet 41 C gwk compact controller with 4-line alpha-numerical display.

6 Standard temperature controllers for injection moulding teco cw The most cost-effective solution for glycol-free water from 0 C to 25 C. Precise microprocessor control Simultaneous display of set and actual values Simple one button operation Optional connection for external thermocouple (Fe-CuNi or Pt 100) Optional interfaces at front panel (analogue 0-10 V, 0/4-20 ma; serial RS 232, RS 422, RS 485, TTY; CAN-Bus; Euromap 66) Optional flow rate indication Splash proof electrics Ready to connect mains cable and CEE socket Housing: RAL 7035 Side panels: RAL 2004 teco cs Universal water temperature controllers for the demanding injection moulder. Technical data and standard specification = Standard / o = Option / not available Model teco cw 25 cw 60 cs 90 cs 140 cs 160 Medium water water water water water Temperature max. ( C) 0 to 25 0 to Pump capacity max. (l/min / bar) 60 / 3,8 60 / 5,8 60 / 3,8 60 / 6 60 /6 Cooling capacity (kw / kcal/h) * 4 / 3, / 8, / 20, / 34, / 34,400 Heating capacity (kw) Cooling indirect indirect indirect indirect indirect Weight (kg) Integrated cold water system, close to the mould Robust fully galvanized steel housing, painted in two colours Automatic filling and top up device Strainer in cooling water inlet Durable rubber coated castors All contact parts made of non-corrosive materials Continuous heater control Acoustic alarm Additional manual filling operation for treated water Digital flow rate indication o o o o o Leakage stop operation Mould draining o Magnetically coupled pump Integrated top up pump Mould circuit supply and return connections G ½ G ½ G ½ G ½ G ½ Cooling water supply and return connections G ¼ G ¼ G ¼ G ¼ G ¼ Dimensions in mm (L x W x H) 920 x 250 x x 400 x x 250 x x 250 x x 250 x 595 *) teco cw: at 30 C cooling water and 10 C circuit water temperature / teco cs: at 15 C cooling water and 90 C resp. 130 C circuit water temperature Perfect Cooling and Temperature Control

7 teco 700 and teco 900 Powerful water temperature controllers for applications up to 95 C. Precise microprocessor control Digital alpha-numerical display of set and actual values in a 4-line display Foil keyboard with simple keys 4-line display in textform Optional connection for external thermocouple (Fe-CuNi or Pt 100) Optional interfaces at front panel (analogue 0-10 V, 0/4-20 ma; serial RS 232, RS 422, RS 485, TTY; CAN-Bus; Euromap 66) Switch cabinet in IP 54 with main switch in front plate Covers: RAL 7035 light grey Frame and front panel: RAL 7043 traffi c grey B teco 800 and teco 1000 Powerful pressure water temperature controllers for applications up to 140 C. Technical data and standard specification = Standard / o = Option / Values in ( ) optional Model teco Medium water water water water Temperature max. ( C) Pump capacity max. (l/min / bar) 75 / / / / 6 (200 / 5.2) Heating capacity (kw) 12 (9/18/27) 12 (9/18) 18 (9/12/24/27/36) 15 (9/12/18/24/30) Cooling indirect indirect indirect indirect Cooling capacity (kw)* 50 (75) 30 (50) 120 (180) 100 (200) Automatic filling and top up device Automatic venting and pressure relief Electronic level control with dry-running protection Safety thermostat Leakage stop operation** Adjustable set value limitation Automatic two-step heating circuit > 9 kw Ramp function for temperature alteration Cooling down to safety temperature when switching off Strainer in cooling water inlet Robust steel housing, painted in RAL 7035 / RAL 7043 All contact parts made of non-corrosive materials Durable rubber coated castors Continuous heater control o o o o Acoustic alarm o o o o Digital flow rate indication and monitoring o o o o Additional filling operation for treated water o o o o Mould draining o o o o Return temperature indication o o o o Connection for external Fe-CuNi or Pt 100 o o o o Interface for central machine control o o o o Strainer inreturn line circulation medium o o o o Control of cooling with motor valve o o Mould circuit supply and return connections G ¾ G ¾ G 1 G 1¼ Cooling water supply and return connections*** G ½ G ½ G ½ G ½, ¾, 1 Dimensions in mm (L x W x H)**** 720 x 295 x x 295 x x 320 x x 320 x 750 Weight min., depending on the specification (kg) *) at 15 C cooling water temperature and 80 C circulation medium temperature (teco 700 and 900) / at 15 C cooling water temperature and 130 C circulation medium temperature (teco 800 and 1000), Max. cooling capacity for teco 1000 only in connection with enlarged operating pump **) Exception: teco with enlarged pump 200 l/min ***) Depending on cooling water amount ****) 990 x 400 x 1050 mm for teco 1000 starting from 30 kw heating capacity

8 Model teco wi Powerful temperature controllers with indirect cooling Absolute reliability, high control accuracy, easy handling and a favourable cost/ performance ratio besides the versatile features, these are the most important criteria of the temperature controller model teco wi. In close teamwork with our customers a series has been developed, that covers a large performance range by means of a modular design. Various different combinations of heating and cooling elements offer the user a large range of applications. It offers various useful options for particularly demanding customers. teco temperature controllers, model wi, are designed as water units with indirect cooling for usage at open consumers up to 95 C and at closed consumers up to 150 C. All units are equipped with the reliable gwk compact controller as standard: Precise microprocessor control Digital alpha-numerical display of set and actual values in a 4-line display Foil keyboard with simple keys 4-line display in textform Optional connection for external thermocouple (Fe-CuNi or Pt 100) Optional interfaces at front panel (analogue 0-10 V, 0/4-20 ma; serial RS 232, RS 422, RS 485, TTY; CAN-Bus; Euromap 66) Switch cabinet in IP 54 with main switch in front plate Individual unit confi guration with different heating and cooling. Perfect Cooling and Temperature Control

9 Besides the easy handling, the units are easy to maintain. The design of the units allows the simple removal of the cover panels without any tools. High-quality components and proven designs mean that gwk temperature controllers are truly superior products. Technical data and standard specification = Standard / o = Option / Values in ( ) optional Model teco wi 100 wi 150 wi 250 wi 400 wi 500 Medium water water water water water Temperature max. ( C) Pump capacity max. (l/min / bar) 90 / / / / / 4.2 Heating capacity, selectable (kw) 9/18/27/36/45/ 9/18/27/36/45/ 9/18/27/36/45/ 9/18/27/36/45/ 9/18/27/36/45/ 54/63/72 54/63/72 54/63/72 54/63/72 54/63/72 Cooling indirect indirect indirect indirect indirect Cooling capacity max. (kw)* Control of cooling with solenoid valve Automatic filling and top up device Automatic venting and pressure relief Electronic level control with dry-running protection Safety thermostat Adjustable set value limitation Automatic two-step heating circuit from 9 kw Ramp function for temperature alteration Cooling down to safety temperature when switching off Strainer in cooling water inlet Robust steel housing, painted in RAL 7035 / RAL 2004 All contact parts made of non-corrosive materials Durable rubber coated castors Continuous heater control o o o o o Acoustic alarm o o o o o Digital flow rate indication and monitoring o o o o o Additional filling operation for treated water o o o o o Pressurised air valve for mould draining o o o o o Return temperature indication o o o o o Connection for external Fe-CuNi or Pt 100 o o o o o Interface for central machine control o o o o o Strainer inreturn line circulation medium o o o o o Control of cooling with motor valve o o o o o Additional expansion tank for large external volumes o o o o o Mould circuit supply and return connections G 1 G 1¼ G 1½ DN 50 DN 65 Cooling water supply and return connections** G ½, ¾, 1 G ½, ¾, 1 G ½, ¾, 1 G ½, ¾, 1 G ½, ¾, 1 Housing length L (mm) *** 990 (1120/1465) 990 (1120/1465) 990 (1120/1465) Housing width W (mm) *** 430 (510/570/695) 430 (510/570/695) 430 (510/570/695) 570 (695) 570 (695) Housing height H (mm) *** 935 (1275) 935 (1035/1275) 935 (1035/1275) Weight min., depending on the specification (kg) *) at 15 C cooling water temperature and 130 C circulation medium temperature **) depending on cooling water amount ***) depending on built-in heating and cooling capacities as well as the size of the expansion tank

10 Models teco wd/itc Modular temperature controllers with direct cooling teco wd The gwk temperature controllers series teco wd and teco itc are heating and cooling units ready for connection to the process with direct cooling which are designed for operation with water as the circulation medium. Direct cooling is an advantage, when a high cooling capacity is required at low temperature differences between cooling water and the circulation medium. In this case the cooling water will be fed without temperature loss into the circulation circuit. The water circuit, designed as a closed system, allows a pressurized use up to 140 C. Depending on the operating condition, the heat will either be removed from the consumer by cooling or transferred to the consumer by heating. The heat transfer occurs by the circulation medium water which is to be transferred with an effi cient pump through the consumer. The type teco itc is equipped with multi-stage solenoid valve cooling to achieve small temperature tolerances, whereas the series wd is equipped with a motor valve in the cooling water circuit. Control of the circulation medium temperature takes effect automatically. A temperature sensor, installed inside the unit, measures the existing actual temperature. The microprocessor controller compares the measured value with the adjusted set value and switches the heating or cooling accordingly. A trouble-free operation is guaranteed by a comprehensive safety system. As standard the unit is equipped with a large number of functions, on request this may be complimented by various useful options. For connection with the controllers of the processing machines all current interfaces are available. All units are equipped with the reliable gwk compact controller as standard: Precise microprocessor control Digital alpha-numerical display of set and actual values in a 4-line display Foil keyboard with simple keys 4-line display in textform Optional connection for external thermocouple (Fe-CuNi or Pt 100) Optional interfaces at front panel (analogue 0-10 V, 0/4-20 ma; serial RS 232, RS 422, RS 485, TTY; CAN-Bus; Euromap 66) Switch cabinet in IP 54 with main switch in front plate Individual unit confi guration with different heating and cooling. teco itc Perfect Cooling and Temperature Control

11 The temperature controllers of the series teco wd with their modular design cover a large range of applications with a high range of performance. Motor valves in the cooling water circuit provide for an exact temperature control and simultaneously avoid pressure surges during cooling. Technical data and standard specification = Standard / o = Option / Values in ( ) optional Model teco itc 60 wd 100 wd 150 wd 250 wd 400 wd 500 Medium water water water water water water Temperature max. ( C) Pump capacity max. (l/min / bar) 45 / 6 90 / / / / / 4.2 Heating capacity, selectable (kw) 6 9/18/27/36/ 9/18/27/36/ 9/18/27/36/ 9/18/27/36/ 9/18/27/36/ 45/54/63/72 45/54/63/72 45/54/63/72 45/54/63/72 45/54/63/72 Cooling direct direct direct direct direct direct Cooling capacity max. (kw)* Control of cooling with motor valve Automatic filling and top up device Automatic venting Electronic level control with dry-running protection Safety thermostat Adjustable set value limitation Automatic two-step heating circuit from 9 kw Ramp function for temperature alteration Cooling down to safety temperature when switching off Strainer in cooling water inlet Robust steel housing, painted in RAL 7035 / RAL 2004** All contact parts made of non-corrosive materials Durable rubber coated castors Continuous heater control o o o o o o Acoustic alarm o o o o o o Digital flow rate indication and monitoring o o o o o o Pressurised air valve for mould draining o o o o o o Return temperature indication o o o o o o Interface for central machine control o o o o o o Connection for external Fe-CuNi or Pt 100 o o o o o o Strainer inreturn line circulation medium o o o o o o Control of cooling with solenoid valve o o o o o Additional expansion tank for large external volumes o o o o o Mould circuit supply and return connections G ¾ G 1 G 1¼ G 1½ DN 50 DN 65 Cooling water supply and return connections *** G ½ G ½, ¾, 1 G ½, ¾, 1 G ½, ¾, 1 G ½, ¾, 1 G ½, ¾, 1 Housing length L (mm) **** (1120/1465) 990 (1120/1465) 990 (1120/1465) Housing width W (mm) **** (510/570/695) 430 (510/570/695) 430 (510/570/695) 570 (695) 570 (695) Housing height H (mm) **** (935/1275) 735 (935/1275) 735 (935/1275) Weight min., depending on the specification (kg) *) at 15 C cooling water temperature and 130 C circulation medium temperature **) itc 60: Covers: RAL 7035 light grey, Frame and front panel: RAL 7043 traffic grey B ***) depending on cooling water amount ****) depending on built-in heating and cooling capacities as well as the kind of cooling control

12 Model teco wh Reliable water temperature controllers for high temperatures Water has a major advantage compared to heat transfer oil if relatively large amounts of heat need to be extracted from small cooling surfaces. In order to be able to transfer a constant amount of heat between the mould wall and the medium for the same median temperature differential, four to fi ve times the area of cooling surfaces, or the same number of cooling channels, is required if heat transfer oil is used instead of water. It is precisely this which often cannot be achieved in practice with small moulds. The use of water as a heat transfer medium has the further advantage that the amount of liquid to be circulated by the pump is reduced by a factor of two to three compared with heat transfer oil. The gwk hot water temperature controllers of the teco wh series are designed for special applications in the temperature range up to 200 C. Magneticallycoupled pumps, return fl ow temperature monitoring and limiting, a built-in condensing unit to prevent steam impacts, level monitoring via a built-in high-pressure makeup feed unit and a ramp function included as standard for temperature changes to heat up the mould more gently at the start of production and the corresponding cooling down at the end of production guarantee the highest possible level of process security. The modular construction of the heating and cooling sections allows a unit to be designed for any type of application. The teco wh units are equipped with the reliable gwk compact controller as standard: Precise microprocessor control Digital alpha-numerical display of set and actual values in a 4-line display Foil keyboard with simple keys 4-line display in textform Optional connection for external thermocouple (Fe-CuNi or Pt 100) Optional interfaces at front panel (analogue 0-10 V, 0/4-20 ma; serial RS 232, RS 422, RS 485, TTY; CAN-Bus; Euromap 66) Switch cabinet in IP 54 with main switch in front plate Individual unit confi guration with different heating and cooling. Plastic moulding compound Short description Mould wall temperature Liquid crystal polymers LCP C Polyamide 6.6 PA C Polyethylene terephthalate PET C Polybutylene terephthalate PBT C Polyphenylene oxide PPO C Polyacetal POM C Polycarbonate PC C Polyether imide PEI C Polyphenylensulfon PPSU C Polyether sulphone PES C Polyphenylene sulphide PPS C Polysulphone PSU C Polyetheretherketone PEEK C Proven equipment technology ensures safe operation with pressurised water at up to 200 C. Perfect Cooling and Temperature Control

13 An increasing number of precision parts are produced from technical thermo - plastics. The quality of the parts depends to a great degree on precise heating and cooling during the process. Technical data and standard specification = Standard / o = Option / Values in ( ) optional Model teco wh 60 wh 90 wh 120 Medium water water water Temperature max.( C) Pump capacity max. (l/min / bar) 60 / 5 80 / / 5 Heating capacity (kw) 9 (18/27) 18 (27/36) 27 (36/45/54) Cooling indirect indirect indirect Cooling capacity max. (kw)* 32 (64) 40 (80) 48 (96) Sealless pump with magnetic coupling Temperature controlled pressure overlay Condensing unit to prevent steam impacts Return temperature indication Return flow temperature monitoring and limiting Built-in high-pressure makeup feed unit Automatic venting and pressure relief Electronic level control with dry-running protection Safety thermostat Adjustable set value limitation Automatic two-step heating circuit Ramp function for temperature alteration Cooling down to safety temperature when switching off Strainer in cooling water inlet Robust steel housing, painted in RAL 7035 / 7043 All contact parts made of non-corrosive materials Durable rubber coated castors Continuous heater control o o o Acoustic alarm o o o Connection for external Fe-CuNi or Pt 100 o o o Interface for central machine control o o o Additional filling operation for treated water o o o Strainer inreturn line circulation medium o o o Control of cooling with motor valve o o o Additional expansion tank for large external volumes o o o Mould circuit supply and return connections PN 40 DN 25 DN 32 DN 32 Cooling water supply and return connections G ½ G ½ G ½ Housing length L (mm) ** (1125) 990 (1125) Housing width W (mm) ** 320 (400) 400 (500) 400 (500) Housing height H (mm) ** 750 (950) 950 (1185) 950 (1185) Weight min., depending on the specification (kg) *) at 15 C cooling water temperature and 150 C circulation medium temperature **) depending on built-in heating and cooling capacities as well as the size of the expansion tank

14 Models teco tt/th Heat transfer oil-temperature controllers for highest demands As a rule, temperature controllers which are designed for operation with heat transfer oil are used for circulating temperatures above 200 C. Dealing with thermal oil makes it necessary to take different criteria into account which also have a constructive infl uence on the design of oil temperature controllers. Hot thermal oil has a low oxidation stability when direct contact to ambient air is allowed as found in some competitors units which use a submersible pump and tank. This increase of air absorption can cause the oil to become more viscous and the pump fl ow rate to decrease. As an open design does not allow for a defi ned fl ow with reliable monitoring this oxidation due to the lowering fl ow rate can cause an excess of oil fi lm at high temperature on the heating element which will lead to a tarry coating and carbon deposits forming within the heat transfer system eventually leading to the decomposition of the oil and subsequent clogging of the heat transfer system. The consequence of choosing the wrong type of oil temperature controller are more waste product, poor product quality and higher maintenance costs. It is due to these reasons that gwk do not manufacture oil temperature controllers with an open circuit. The closed circuit design allows these units to run up to 300 C with the th design up to 350 C. Perfect Cooling and Temperature Control

15 The gwk teco tt and th series have been specially designed for applications that require higher temperatures. The specifi c heating surface loading is designed to be such that thermal decomposition of the heat transfer oil can be prevented without fail at normal fl ow rates. Built-in fl ow monitoring ensures that an alarm is given if the fl ow rate becomes too low. It is necessary to prevent oxygen from entering the system in order to avoid damage to the heat transfer oil from oxidation. The closed circuits of the teco tt units have a layer of cold oil in the expansion vessel, which can also be equipped with a nitrogen covering supply device on request. Technical data and standard specification = Standard / o = Option / Values in ( ) optional Model teco tt 60 tt 100 tt 140 th 60 th 100 th 140 Medium thermal oil thermal oil thermal oil thermal oil thermal oil thermal oil Temperature max. ( C) Pump capacity max. (l/min / bar) 60 / / / / / / 7.0 (80 / 11.0) (80 / 11.0) Heating capacity, selectable (kw) 8 (4/12) 16 (8/24/36) 24 (12/36/48) 4 (6) 8 (4/12) 16 (8/24) Cooling water indirect water indirect water indirect water indirect water indirect water indirect Cooling capacity max. (kw)* (52/70/ 35 (52/70/ (52/70/ 35 (52/70/ (35/47) 100/115) 100/115/175) (35/47) 100/115) 100/115/175) Control of cooling with solenoid valve Sealless pump with solenoid coupling Water seal in expansion tank Flow control with switch-off function Difference temperature control with switch-off function Electronic level control with dry running protection Safety thermostat Adjustable set value limitation Automatic two-step heating circuit Ramp function for temperature alteration Cooling down to safety temperature when switching off Bellows type valve in UV, UR and on the filter Filter group in suction pipe Strainer in cooling water inlet Robust steel housing, painted in RAL 7035 / 7043 All contact parts made of non-corrosive materials Continuous heater control o o o o o o Acoustic alarm o o o o o o Return temperature indication o o o o o o Connection for external Fe-CuNi or Pt 100 o o o o o o Interface for central machine control o o o o o o Strainer inreturn line circulation medium o o o o o o Cooling in Bypass with 3-way motor valve o o o o o o Connection for nitrogen overlay at expansion tank o o o o o o Mould circuit supply and return connections DN 25 DN 25 DN 32 DN 25 DN 25 DN 32 Cooling water supply and return connections** G ½ G ½, ¾ G ¾ G ½ G ½, ¾ G ¾ Housing length L (mm) *** (1270) 1120 (1270) (1270) 1120 (1270) Housing width W (mm) *** (450) 400 (450) (450) 400 (450) Housing height H (mm) *** (1395) 1295 (1395) (1395) 1295 (1395) Weight min., depending on the specification (kg) *) at 15 C cooling water temperature and 200 C circulation medium temperature **) depending on cooling water amount ***) depending on built-in heating and cooling capacities

16 Perfect cooling and temperature control Increasing productivity In many areas of the industry, cooling and temperature control provides a great potential for increasing productivity and thus for lowering costs. Production cost Cost reduction Many factors serve to improve productivity: Reduction of cooling time, therefore savings in required machine hours Improvement of product quality Increasing availability of production plants Decreasing running cost Reduction of maintenance cost gwk integrat 4D Optimal product quality through homogeneous temperature distribution with close-to-cavity cooled mould inserts. gwk KU plants The simplest and cheapest solution to increase the availability and to decrease the maintenance cost of open cooling systems. gwk system integrat Increase of productivity by means of specific and segmented control of the mould cooling. gwk hermeticool hybrid Innovative cooling system to decrease the running and maintenance cost in comparison to conventional cooling systems. gwk moldclean Increased productivity through effective, automatically controlled cleaning of heat exchange surfaces in cooling and temperature controlled circuits. gwk SKL / SKW Reliable and economic supply of cooling water in the low temperature range, even under the toughest ambient conditions. gwk HSW Cost reduction by means of advanced heat recovery systems. gwk container plants Highest flexibility and lowest expenses for planning installation and movement of a centralised cooling plant. gwk active Adjusting and maintaining optimum capacity by means of constantly clean water, delivered from a fully automatic water treatment device. gwk service Decreasing the maintenance cost and protection of company owned resources through professional installation and service including maintenance of cooling water. TG EN / Gesellschaft Wärme Kältetechnik mbh D Kierspe Friedrich-Ebert-Straße Tel Fax info@gwk.com