- 15 -
5.5 Operating the Microprocessor-Controller (PID)
5.5.1 Permanent working mode
After switching the thermostat on the actual temperature appears in the display alternating
with “End”.
The controller is in the stand-by mode.
If necessary you can change the actual value by change of the SET-Key > 3 s. You will get access to the
setting mode.
“SPP” appears in the display. Hold the SET-Key pressed and adjust the desired set-point
value by the arrow keys. To return into the Stand-by mode by pressing both arrow keys simultaneously.
Press the permanent key. The controller change from the standby- into the permanent working mode. The
thermostat is heating up to the set-point value indicated in the display.
You can stop the permanent mode or stop by pressing the permanent key. The controller will return into the
stand-by mode.
If you have selected the permanent mode during the heating up phase in order to temper the samples for a
limited time you can change over to the timer mode by pressing the timer-key.
Besides you can activate the ramp function, for instance to approach the set-point value smoothly in order
to avoid any exothermal of digestion reactions.
5.5.2 Timer Working mode
If you want to temper your samples for a limited duration you can activate the timer function by pressing the
timer key. The timer LED is illuminated red in order to indicate the limited heating.
Please note: The timer function is starting when the set-point temperature has been reached.
You can stop or cut off the timer function by pressing the timer key for more than 3 s. The controllers returns
to the stand-by mode automatically. Please note that the beeper will not be actuated
.
You can read the elapsed time of the timer from the display by pressing the
“Down” arrow key.
After passing the timer duration an beeping sound will be initiated. The timer LED distinguished. The display
shows
alternating “End” and the actual temperature. The beeper can be switched off by pressing the “UP”
key.
You can adjust the time (max. 99h 99 min) by pressing the SET-key > 3 s.
“SPP”appears in the display.
Press the timer key.
“t” appears in the display. Hold the SET key pressed and adjust the time by the arrow
keys.
5.5.3 mp function
You can activate or deactivate the ramp function at any time by pressing the Ramp key thus the correspond-
ing LED is on or respectively out. This feature allows you to reduce the power of the heating up period.
After starting the ramp function the controller measures the actual temperature and increases this value by
the setting the ramp gradient °C/ min. This is the new intermediate set-point value, valid for only one
minute. After this minute this value will be increased until the set-point values is reached. Afterwards the
set-point value will be hold constant.
You can adjust the ramp gradient by pressing the SET-key > 3 s . So you get access to the setting mode In
the display appears
“SPP”. Press the ramp key. “Gr” appears in the display. Hold the SET-key pressed in
order to change the ramp gradient °C/min.
Summary of Contents for BIO-1F
Page 23: ......