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Accelerating the path to discovery
®
1.
Press and hold in both the
and
keys on the front of the temperature meter until the word “
tunE” appears in the display,
then release both keys.
2.
Press the
key once and “LEVL” appears in the display.
First hold in the ‘
*
’ key, then while holding in the ‘
*
’ key press the
key until “
2
” appears in the display then let go of all the
keys.
3.
Press the
key repeatedly until the word “diSP” appears in the display.
First hold in the ‘
*
’ key, then while holding in the ‘
*
’ key press the
or
key until the value “
1
” [not “
0.1
”] appears in the
display, then let go of all the keys.
4.
Press and hold in both the
and
keys until the temperature appears in the display, then release both keys.
A stack of fuses built for solid-state equipment is housed inside the controller to protect it. None of the fuses is user
replaceable, thus an expert electrician should replace them all. FUSES MUST BE REPLACED WITH THE EXACT EQUALS
if they need to be changed. Stores that sell electrical supplies may have fuses.
3.9 Fusing
The PID (Proportional, Integral, Derivative) or ON/OFF operating modes are the two heating options for the
controller. They differ in how they provide electricity to the heater.
3.10 Changing Between PID and ON/OFF Operating Modes
The simplest heating mode, ON/OFF, turns the
controller ON when the temperature is below the
specified value and OFF when it is above. This mode’s
drawback is a significant overshoot of the set point
(5–30°) during initial warm-up and subsequent
temperature fluctuation around the set point. The
heater only switches off after exceeding the set point,
which causes the temperature to climb until the heater
cools down as the cause of the overshoot. For heaters
that transmit heat quickly (for example, filament
bulbs), this technique works effectively. It is horrible for
heaters that transmit heat slowly (for example, vacuum
ovens), but it is tolerable for heaters like heating
mantles (≈ 5° overshoot)
!
Temp
Set
Point
Power
to heater
Off
On
Time
Temperature
of solution
ON/OFF Mode
Temperature continues
to rise until the heater
cools down
High Powered Heating Mantle Controllers
