Operating Parameters; Excess Temperature Setpoint; Hysteresis; Excess Temperature Controller Operation - Thermo Scientific CC58114PC Installation And Operation Manual

Excess Temperature Option

Operating Parameters

Operating Parameters

Excess Temperature Setpoint

The Excess Temperature setpoint is typically set about 10 °C (18 °F) above the
planned operating temperature of the chamber, or to the maximum temperature
the product or process could tolerate.
The Excess Temperature setpoint is selected by holding the SET/ENT button for
three seconds to show "SP" in the top display and the current setpoint in the
bottom display. Adjust the setpoint with the arrow buttons and press the SET/ENT
to register the new setpoint.

Hysteresis

Set the hysteresis ("HYS") of the Excess Temperature Controller to effectively use
the Duration Timer feature. This value is usually 80% of the temperature
difference between the Excess Temperature setpoint and the chamber operating
temperature. For example. with an Excess Temperature stipend of 1220 °C and
chamber operating temperature of 1180 °C, set the hysteresis to 32 °C.
The hysteresis also controls the point when the "exceeded" indicator is
extinguished and the Excess Temperature Controller can be reset.
Exit the Operating Parameters by holding the SET/ENT button for three seconds.

Excess Temperature Controller Operation

After the Excess Temperature Stipend and Hysteresis values are selected, the
controller is ready for operation. The stipend and hysteresis should be reviewed
and adjusted if necessary, when the main controller stipend is changed.
During an excess temperature incident, the "EXCEEDED" and "OUT" indicators
are illuminated the controller display area when the stipend is tripped. The
"EXCEEDED" indicator will stay illuminated while the temperature cools to the
hysteresis amount, then turn off.
When the "EXCEEDED" indicator is extinguished, the Excess Temperature
Controller can be reset holding the "up arrow/reset" button for few seconds when
the normal operating display is showing the current measured temperature and
the setpoint or just the setpoint.
The Exceeded Temperature Duration Timer and The Peak Exceeded
Temperature can be viewed either before or after the controller is reset. These are
viewed on the controller display when the SET/ENT button is pressed and
released, with the "tIn" or "HI" in the top display. These values will be erased from
the display and memory when the "up arrow/reset" button is pressed during their
respective displays (and the "EXCEEDED" indicator is off).
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