SME industrial ovens are used for various applications such as in drying, baking, curing, preheating, sterilizing, tempering, stoving, ageing, stress relieving, annealing and sintering. The industrial ovens are designed constructed from double waited crca / SS sheets with energy saving insulation. Heating is by tubular finned heaters or infrared heaters with a soft start. The industrial ovens are provided with air circulation and front opening doors with locking arrangement for safety automatic temperature controllers and timers. Temperature range covered is 50c to 500c. SME also manufactures tray driers and heat treatment furnaces

Used in many industries for heating and drying requirements.Dryer is used for the best drying results in conventional process. It is a double walled cabinet with one or two doors. The gap between two walls is filled with high density fibre glass wool insulation material to avoid heat transfer. Doors are provided with gaskets. Stainless steel trays are placed on the movable trolleys.

Dynamically balanced axial flow type blower fans are provided for uniform air circulation in the drying chamber during process. Machine is provided with control panel board with process timer. Digital temperature controller cum indicator etc.

The infinite control switch gives infinite control for non-inductive loads up to 15 Amps on 120 or 240 V-AC (cannot be used with an external contactor). It can be turned either to left or right to adjust proper heat from 0-100% wattage with infinite control over the first 50% of total wattage. Energized continuously in HI position, at other settings it delivers selected input level under control of a simple bimetal timer. Only 3 mounting holes are necessary to install the INFINITE CONTROL SWITCH in customer supplied box or panel. It is designed for use at ambient temperatures up to 85C.

The model INF turns clockwise or counterclockwise. A double-line disconnect is provided when the control is in the "Off" position. The permanent magnet provides snap action of contacts. Clean makes and breaks ensure long life of the fine silver contacts. The switch control is ambient compensated. It is designed for operation whereambient temperature does not exceed 85C.The control contains a bimetal, which regulates the running cycles. This bimetal has a resistance wire wrapped around it, which is connected in parallel with the heating unit being controlled and cycles in unison with the heating element. When the switch is turned to "ON" position, the follower moves out and allows the contacts to close. This completes a circuit through a heating unit being controlled, and also to the resistance wire wrapped around the bimetal. At this time the steel armature is under the influence of the magnetic pull of magnet. As the resistance wire heats the bimetal, the bimetal flexes and forces are built up in it. When the force built up is equal to the magnetic pull of the magnet, the contacts open with a snap action and the steel armature will be pulled away from the magnetic field. This opens the contacts, which will cut off the power of the heating unit being controlled and will also disconnect the power to the bimetal-Resistance wire. As the bimetal cools, it will then flex in the opposite direction and the contacts will start moving closer together. At a certain point the magnetic pull will close with a snap action. This then will permit current to flow throughout the unit once again as the circuit is complete. A second bimetal is employed as an ambient temperature compensator to neutralize the effect of the surrounding temperatures on the control bimetal. These controls are designed to operate in locations where the maximum ambient temperature does not exceed approximately 85C.The infinite control switch can control any resistive load up to 15 amps.
It is possible to obtain a range of inputs to the element and/or load from approximately 5% at low- 100% at high, and infinite settings in between.

Features

The SME Energy Regulator effects its control by periodically switching the power on and off, the ratio of the on time to the total time determining the average power input.
As compared with a variable resistance, the energy regulator is in general cheaper, far less bulky, and applicable to any load up to its rated capacity. Moreover, the control is effected without the loss of energy associated with resistance control, is variable continuously from no load to full load and is substantially independent of mains voltage fluctuations up to about 20%.

The energy regulator mainly consists of a heated bimetal and a snap-action switch (spring contact). Fig. 1 below will make the mode of operation clear.

• Is a bimetal strip holder carrying a cam follower whose function is to compensate for variations of ambient temperature
• Is a bimetal strip carrying a heater winding
• Is a snap-action switch operating the contact
• Is a knife edge about which the bimetal assembly can pivot
• Is a means of adjustment

Normally the contact D is closed so that current flows through the heater winding on the bimetal and through the load. The bimetal warms and, in bending, opens the switch C, interrupting the current both to the heater winding and to the load.

The bimetal then cools and the cycle is repeated. The ratio of the time during which the contacts are made, to the total time of the cycle, determines the average input.

This ratio is controlled by the adjusting cam F. Clearly if the cam is set so that the contacts remain closed with the maximum deflection of the bimetal, the power will be permanently on; if the cam is turned until the contact D is open with the bimetal cold, the power will be permanently off. Between these two limits the input is continuously adjustable.

Since the same voltage is applied to the energy regulator as is applied to the load, any variation will affect the two similarly, so that the average input is independent of applied voltage over a wide range.

Features

• Long duty cycle and short intervals between heating = greater average output, e.g. for heating up
• Short duty cycle and long intervals between heating = smaller average output, e.g. for simmering
• The output of the load can be set to between 6% to 85% of the rated output. Select highest setting for full nominal rating (100%).
• Infinitely variable control of the power supply

An infrared heater is a body with a higher temperature which transfers energy to a body with a lower temperature through electromagnetic radiation. Depending on the temperature of the emitting body, the wavelength of the infrared radiation ranges from 780 nm to 1 mm. The relationship between temperature and wavelength is expressed by the Stefan-Boltzmann Law. No contact or medium between the two bodies is needed for the energy transfer. A rough classification of infrared heaters is

The SME Snap Action Thermostat regulates the temperature continuously by switching the power on and off after the achievement of the set temperature. The Snap Thermostats normally closed contacts opens on achieving the set temperature which closes again when the temperature will drop by the differential.

SME industrial ovens are used for various applications such as in drying, baking, curing, preheating, sterilizing, tempering, stoving, ageing, stress relieving, annealing and sintering. The industrial ovens are designed constructed from double waited crca / SS sheets with energy saving insulation. Heating is by tubular finned heaters or infrared heaters with a soft start. The industrial ovens are provided with air circulation and front opening doors with locking arrangement for safety automatic temperature controllers and timers. Temperature range covered is 50c to 500c. SME also manufactures tray driers and heat treatment furnaces

Thermostat with single pole stem control and double pole safety limiter

Features

• Combined control and safety function
• bimetal for independant non self resetting safety option
• Direct plug-in to heating element to reduce wiring and mounting costs
• Tamper proof housing
• Factory pre-set fixed temperature, OEM adjustable or end-user adjustable temperature
• Connection for signal lamp

Operation
The differential expansion of the sensing element causes the opening of a snap-action switch in the thermostat head. In case of abnormal temperature rise, the patented MFS technology in the stem or traditional bimetal ensures double pole safety. The limiter is manually resettable.

Used in many industries for heating and drying requirements.Dryer is used for the best drying results in conventional process. It is a double walled cabinet with one or two doors. The gap between two walls is filled with high density fibre glass wool insulation material to avoid heat transfer. Doors are provided with gaskets. Stainless steel trays are placed on the movable trolleys.

Dynamically balanced axial flow type blower fans are provided for uniform air circulation in the drying chamber during process. Machine is provided with control panel board with process timer. Digital temperature controller cum indicator etc.

The infinite control switch gives infinite control for non-inductive loads up to 15 Amps on 120 or 240 V-AC (cannot be used with an external contactor). It can be turned either to left or right to adjust proper heat from 0-100% wattage with infinite control over the first 50% of total wattage. Energized continuously in HI position, at other settings it delivers selected input level under control of a simple bimetal timer. Only 3 mounting holes are necessary to install the INFINITE CONTROL SWITCH in customer supplied box or panel. It is designed for use at ambient temperatures up to 85C.

The model INF turns clockwise or counterclockwise. A double-line disconnect is provided when the control is in the "Off" position. The permanent magnet provides snap action of contacts. Clean makes and breaks ensure long life of the fine silver contacts. The switch control is ambient compensated. It is designed for operation whereambient temperature does not exceed 85C.The control contains a bimetal, which regulates the running cycles. This bimetal has a resistance wire wrapped around it, which is connected in parallel with the heating unit being controlled and cycles in unison with the heating element. When the switch is turned to "ON" position, the follower moves out and allows the contacts to close. This completes a circuit through a heating unit being controlled, and also to the resistance wire wrapped around the bimetal. At this time the steel armature is under the influence of the magnetic pull of magnet. As the resistance wire heats the bimetal, the bimetal flexes and forces are built up in it. When the force built up is equal to the magnetic pull of the magnet, the contacts open with a snap action and the steel armature will be pulled away from the magnetic field. This opens the contacts, which will cut off the power of the heating unit being controlled and will also disconnect the power to the bimetal-Resistance wire. As the bimetal cools, it will then flex in the opposite direction and the contacts will start moving closer together. At a certain point the magnetic pull will close with a snap action. This then will permit current to flow throughout the unit once again as the circuit is complete. A second bimetal is employed as an ambient temperature compensator to neutralize the effect of the surrounding temperatures on the control bimetal. These controls are designed to operate in locations where the maximum ambient temperature does not exceed approximately 85C.The infinite control switch can control any resistive load up to 15 amps.
It is possible to obtain a range of inputs to the element and/or load from approximately 5% at low- 100% at high, and infinite settings in between.

Features

The SME Energy Regulator effects its control by periodically switching the power on and off, the ratio of the on time to the total time determining the average power input.
As compared with a variable resistance, the energy regulator is in general cheaper, far less bulky, and applicable to any load up to its rated capacity. Moreover, the control is effected without the loss of energy associated with resistance control, is variable continuously from no load to full load and is substantially independent of mains voltage fluctuations up to about 20%.

The energy regulator mainly consists of a heated bimetal and a snap-action switch (spring contact). Fig. 1 below will make the mode of operation clear.

• Is a bimetal strip holder carrying a cam follower whose function is to compensate for variations of ambient temperature
• Is a bimetal strip carrying a heater winding
• Is a snap-action switch operating the contact
• Is a knife edge about which the bimetal assembly can pivot
• Is a means of adjustment

Normally the contact D is closed so that current flows through the heater winding on the bimetal and through the load. The bimetal warms and, in bending, opens the switch C, interrupting the current both to the heater winding and to the load.

The bimetal then cools and the cycle is repeated. The ratio of the time during which the contacts are made, to the total time of the cycle, determines the average input.

This ratio is controlled by the adjusting cam F. Clearly if the cam is set so that the contacts remain closed with the maximum deflection of the bimetal, the power will be permanently on; if the cam is turned until the contact D is open with the bimetal cold, the power will be permanently off. Between these two limits the input is continuously adjustable.

Since the same voltage is applied to the energy regulator as is applied to the load, any variation will affect the two similarly, so that the average input is independent of applied voltage over a wide range.

Features

• Long duty cycle and short intervals between heating = greater average output, e.g. for heating up
• Short duty cycle and long intervals between heating = smaller average output, e.g. for simmering
• The output of the load can be set to between 6% to 85% of the rated output. Select highest setting for full nominal rating (100%).
• Infinitely variable control of the power supply

An infrared heater is a body with a higher temperature which transfers energy to a body with a lower temperature through electromagnetic radiation. Depending on the temperature of the emitting body, the wavelength of the infrared radiation ranges from 780 nm to 1 mm. The relationship between temperature and wavelength is expressed by the Stefan-Boltzmann Law. No contact or medium between the two bodies is needed for the energy transfer. A rough classification of infrared heaters is