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4. THEORY OF OPERATION
The Protocol 3 is a microprocessor based
digital temperature controller designed for
simple and flexible oven operation. The
Protocol 3 controller operates as a dual-
functioning controller/high limit instrument.
The control portion utilizes a
time-proportioning voltage signal to control
heating devices with minimal temperature
fluctuations.
The high limit portion protects the product and/or the oven from overheating. If
the product being processed has a critical high temperature limit, the high limit
set point should be set to a temperature somewhat below the temperature at
which the product could be damaged. If the product does not have a critical high
temperature limit, the high limit set point should be set 5 to 15 degrees higher
than the maximum programmed set point at which the oven will operate.
The Protocol 3 controller provides three primary operating modes:
• Manual: Oven operates continuously at a fixed temperature until turned off.
• Timer: Oven operates at a fixed temperature for a user-selected time period,
and then automatically turns off.
• Profile: Temperatures increase or decrease as defined by 255 segments that
can be allocated to 64 ramp and soak profiles. The profiles can be linked to
provide additional temperature combinations.
The Protocol 3 controlled is equipped to allow a ramp/soak temperature control,
which maintains oven temperature with either a fixed set point or a ramp/soak
profile.
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