21
General Operation
Changing Display Units
General Operation
8
Changing Display Units
8.1
The 7102 can display temperature in Celsius or Fahrenheit. The temperature units are
shipped from the factory set to Celsius. To change to Fahrenheit or back to Celsius
there are two ways:
Press “SET” and “UP” simultaneously. This will change the display units.
1.
Press the “SET” key three times from the temperature display to show
2.
Un = C
or
Press the “UP” or “DOWN” key to change units.
1.
Press “SET” to store changes.
2.
Switching to 230V Operation
8.2
The 7102 is switchable from 115 VAC to 230 VAC 50/60 Hz. Swithcing the voltage
can change the calibration, so
the unit should be calibrated after changing the input
voltage.
To change from 115 VAC to 230 VAC:
Unplug the unit.
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With a small straight slot screwdriver remove the fuse holder located on the
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back of the bath. Replace the two fuses (3 amp 250 V) with 1.6 amp 250 V
fuses.
Replace the fuse holder with the “230V” in the display window.
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Note: Use 3 amp fuses for 115 V and 1.6 amp for 230V only. DO NOT PLUG
THE UNIT INTO 230 V IF THE FUSE HOLDER READS 115 V.
8.3 Bath Fluid
Many fluids work with the 7102 bath. Choosing a fluid requires consideration of many
important characteristics of the fluid. Among these are temperature range, viscosity,
specific heat, thermal conductivity, thermal expansion, electri cal resistivity, fluid
lifetime, safety, and cost.
Temperature Range
8.3.1
One of the most important characteristics to consider is the temperature range of the
fluid. Few fluids work well throughout the complete temperature range of the bath.
The temperature at which the bath is operated must always be within the safe and
useful temperature range of the fluid. The lower tempera ture range of the fluid is
determined by the freeze point of the fluid or the tem perature at which the viscosity
becomes too great. The upper temperature is usually limited by vaporization,
