Despatch LBB2-xxA/B-2 Manual de usuario descargar pdf (Pagina 21)

LBB Series Oven Owner’s Manual THEORY OF OPERATION

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3.1.1. Oven Theory

The LBB Series forced circulating oven uses fans to circulate air through the chamber. A

circulating oven is a much more efficient and uniform oven than a gravity-convection oven due to

the constant air movement. Soaking at a desired setpoint still depends on a number of parameters

including chamber area, load mass, the ability to absorb heat and the exhaust rate. But soak times

with a forced circulating oven may be shortened.

The LBB Series oven is capable of heating to 204°C (400°F). The oven uses a

microprocessor-based digital control to display the actual chamber temperature at the sensing

point. The temperature sensor is located to optimize control action for the entire chamber for

various load conditions. The control display may fluctuate a few degrees around the setpoint,

reflecting temperature changes at the sensor location. However, overall chamber temperature

remains stable. The strategic location of the sensor compensates for delays in heat convection and

enhances the performance and temperature control of the oven. The oven has been designed for

an overall result of quality productivity where fast processing and versatility are critical.

3.2. Control Systems

3.2.1. Primary Control Instrument

The LBB Series oven is equipped with a

microprocessor-based digital control instrument

configured as a proportional controller and set to

its optimum operating values (Figure 4). Initially

the control instrument allows the heater to

operate at full power. As the actual oven

temperature reaches the setpoint, the control

instrument cycles the heater on and off,

minimizing process temperature fluctuations.

Table 2 provides explanation for working with

the control instrument.

Warning!

Do not remove the hat bracket as it distributes exhaust air and

protects the exhaust opening from being completely covered.

Figure 4. LBB Series Oven Primary Control Instrument

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Despatch LBB2-xxA/B-2 Manual de usuario Pagina 21