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Un= C
Press "UP" or "DOWN" to change the units.
Un= F
Press "SET" to accept the new selection and resume displaying the bath
temperature.
8.4 Secondary Menu
Functions which are used less often are accessed within the secondary menu.
The secondary menu is accessed by pressing "SET" and "EXIT" simultaneously
and then releasing. The first function in the secondary menu is the heater power
display.
8.5 Thermal Electric Devices (TEDs)
The temperature controller controls the temperature of the bath by supplying a
linear voltage to the TEDs. The total power being applied to the TED is
determined by the duty cycle. This value may be estimated by watching the
red/green control indicator light or read directly from the digital display. By
knowing the amount of power to the bath the user can tell if the bath is heating
up to the set-point, cooling down, or controlling at a constant temperature.
Monitoring the percent heater power will let the user know how stable the bath
temperature is. With good control stability the percent heating power should not
fluctuate more than ±1 % within one minute.
The percent power display is accessed in the secondary menu. Press "SET" and
"EXIT" simultaneously and release. The heater power will be displayed as a
percentage of full power.
+
12
Pct
To exit out of the secondary menu press "EXIT". To continue on to the
proportional band setting function press "SET".
Vernier setting
Access scale units selection
Scale units currently selected
New units selected
Set the new units and resume temperature display
Access percent power in secondary menu
Power in percent
Controller Operation
8
8.4 Secondary Menu
8-5
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