Chapter 7 Excess Temperature Option; Control Display; Excess Temperature Option Features; Exceeded Temperature Duration Timer - Thermo Scientific BF51841C Operation Manual

Excess Temperature Option("B" Model)
The Excess Temperature Option, when installed, provides an additional,
independent temperature control system to help protect products from excess
temperatures.
Read this section carefully before using this option.

Control Display

When the Excess Temperature Controller is first turned on, it displays only the
excess temperature setpoint in the bottom display. Press and release the
SET/ENT button to show the duration time of the last excess temperature incident.
(See

"Exceeded Temperature Duration Timer

Press and release the SET/ENT button once again to show the peak temperature
measured for the last excess temperature incident.
Pressing and releasing the SET/ENT button once again shows the current
temperature measured by the controller in the top display; this may differ slightly
from the main temperature controller. The value shown in the bottom display is the
current excess temperature setpoint.
Pressing and releasing the SET/ENT button again cycles back to the first display.

Excess Temperature Option Features

1. Exceeded Temperature Duration Timer
The Exceeded Temperature Duration Timer measures the time that the
setpoint is exceeded (and power to the heater interrupted) until the hysteresis
value is reached as the chamber temperature cools. This time indicates when
the chamber temperature exceeded the Excess Temperature setpoint.

2. Peak Exceeded Temperature

The Peak Exceeded Temperature is the highest temperature measured by the
Excess Temperature Controller.
Thermo Scientific
Section".)
7
7-1