- Halogen heaters use the light emitted from halogen lamps as a source of heat
- Light emitted from halogen heaters is predominantly invisible infrared (heat)
- Highly efficient source of heat energy
- Reliable Japanese quality long lifetime heating elements
High-efficiency: save energy
- high-efficiency energy source. Over 85% of the input power is radiated as infrared radiation.
Quick on/off response: save energy
- Radiated energy of halogen heaters rises and falls almost instantly with switching due to the use of filaments with low heat capacity. You only switch on energy when needed and switch it off when not needed. This saves energy and prevents overshooting/undershooting desired temperature of the process.
- Quartz tube heaters and especially ceramic heaters contain much more mass and therefore take time to heat up and cool down.
Long life and constant energy emission
- The heating elements are designed for 5000 hours at 100% rated voltage.
- Because we modulate the voltage to the heating element from 0-100% the lifetime will be much longer.
- The lamps maintain almost constant energy emission until the end of the rated life.
Emit-Fit easy and quick installation
- easy click-in / click out system eliminates tricky wiring
- no additional technical training necessary to exchange IR heater with EmitFit connector
- Supporting springs hold the EmitFit IR lamp tightly in the lamp holder, any mounting position is possible
- The EmitFit mount features a 960 mm lead wire which can comfortably withstand temperatures of up to 350°C
Infrared radiation can be directed
- Infrared radiation can be controlled optically using mirrors to focus and disperse the light. This way the heat to the target can be directed. This provides a high level of control over the heated area.
Non contact heating
- Objects are heated without direct physical contact.
Clean heat source
- Objects are heated in any kind of environment, either exposed to the atmosphere or in a vacuum. This alleviates concerns about harming the object or the environment it is in.
Heating in vacuum
- USHIO heating elements have a proven track record as a heat source with high reliability in vacuum equipment.
Effective control of your heating element
REVO S series
Universal range of single zone 1, 2 or 3 phase thyristors for resistive and long to medium wave infrared lamp loads, from 30-800A, 480/600 or 690Vac.
Power synchronization and peak power limiting possible in combination with the REVO PC. This keeps the power within the limits of your energy contract.
Lamp operating life & installation precautions
In order to get the best and optimal performance of your infrared heater, the following guidelines are strictly advised. Follow these and your heater will perform correctly and to specification for the expected lifetime.
Seal temperature: maximum 300°C
The seal of the halogen heater is made using molybdenum foil. The molybdenum foil is not completely isolated from the outside air and is in fact exposed to air via a minute gap between the external lead bar and quartz glass.
Extreme oxidation of the foil will occur if this area’s temperature reaches 350°C or higher.
Oxidation of the molybdenum foil will increase its volume, resulting in it pressing up against and damaging the quartz glass and damaging the foil itself.
To ensure long-term stable use, be sure to keep the seal’s temperature at 300°C or below.
Configure the fixtures (lamp housing) so that the temperature of the lead wire, contact terminals, and connectors (housing) remains below the operating temperature limit.
Bulb temperature and halogen cycle: between 250°C and 800°C
The halogen cycle refers to the halogen gas that is often filled into the lamp which reacts and combines with the evaporated tungsten from the filament thus preventing tungsten from being deposited on the bulb wall causing wall blackening.
The bulb temperature should be maintained between 250°C and 800°C to ensure the halogen cycle is operating effectively and to maintain the integrity of the quartz bulb and seals.
Construct the fixtures (lamp housing) and cooling measures so that the unit operates with a tube wall temperature between 250°C and 800°C.
At temperatures below 250°C, the halogen gas will not be very effective and any evaporating tungsten from the filament will be deposited on the bulb wall. The amount of deposit may be small, considering the evaporation of tungsten is lower at low temperatures versus when hot, but over time these tungsten deposits can accumulate and result in bulb wall darkening. If encountered, this effect can often be overcome by once again operating the lamp within the prescribed temperature range, which should clean up most of this blackening.
At temperatures greater than 600°C, the halogen gas again becomes less effective at preventing wall blackening. Beginning at this temperature, the process of dissociation of the halogen/tungsten compound starts to play a role, with some of the free tungsten becoming deposited on the bulb wall.
At temperatures greater than 800°C, not only does blackening increase, but also stresses in the quartz due to increased temperature gradients will begin to affect the lamp, both at localized areas of the bulb as well as at the transition from the bulb to the seals. In addition, any slight impurities within the lamp will no longer have negligible effects due to increased mobility and reaction rates.
Voltage variation on lifetime variation
The life of a lamp is greatly affected by the voltage applied to the lamp.
If the voltage were increased by 10% over the rated voltage, the life expectancy would be cut by 1/3 of the rated life.
Inversely and theoretically, if the voltage applied were limited to 90%, the life would be expected to increase by 3.5 times the rated life.
In practice however, there are other factors involved which prevent such a large increase. Nonetheless, it should be noted that life can be influenced significantly by relatively small changes in voltage.
Correct positioning of the heater
The standard models are all specified for horizontal installation.
Lamps may fail or have extremely reduced life if the lamp is turned on when inclined at an angle exceeding the permitted angle (horizontal ±4°).
Failure to use the lamp in the correct position will lead to overheating and shortened lamp life.
Not in series array or in parallel
Do not operate multiple lamps in a series array or in parallel with each other. Failure to do so may result in damage or shortened operating life.
The resistivity of tungsten changes significantly with temperature.
When an IR lamp is started from a cold state, the lamp will draw a current (amperes) that is about 7-10 times the normal operating current. The magnitude and duration of this current is highly dependent on the particular lamp being used.
This inrush current should be taken into account when designing systems using many lamps as it may impact the service requirements at the electrical mains supporting the system. There are methods to alleviate this such as soft starting, or idling the lamps at low power in between uses.
For effectively controlling the lamps, see our REVO S thyristors.