User manual

21
General Operation
Switching to 230V Operation
General Operation8
8.1 Switching to 230V Operation
The 6102 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. 1.
Lay the unit down on its side. 2.
With a small straight slot screwdriver remove the fuse holder located on the 3.
bottom 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. 4.
Using the same straight slot screwdriver, move the heater switch to dis play 5.
“230V”. See the back panel and bottom drawing in Figure 1 on page 17.
Caution: The input voltage and heater voltage switch settings must both read
230V when complete. Otherwise, the unit will either not heat or only heat at a
fraction of its capacity. If not done properly, the unit could become damaged and
void the calibration and warranty. Use 3 amp fuses for 115 V and 1.6 amp for
230 V only. Do not plug the unit into 230 V if the heater switch and fuse holder
read 115 V. This will cause the fuses to blow and may damage the instrument.
8.2 Bath Fluid
Many fluids work with the 6102 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.
Caution: DO NOT exceed the boiling or flash point of the fluid.
Temperature Range8.2.1
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,
flammability, or chemical breakdown of the fluid. Vaporization of the fluid at higher
temperatures may affect temperature stability because of cool condensed fluid dripping
into the bath from the lid.