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6109A/7109A
Operators Manual
66
Check the Bath Fluid
Optimal temperature performance requires bath fluid in good condition. Check
the fluid often to ensure it stirs easily. Replace the fluid before it begins to
polymerize. The fluid’s viscosity should be 50 centistokes or less at the minimum
temperature. The viscosity of a silicone fluid will increase over time, and it can
thicken quickly at the end of the bath fluid’s lifespan.
Measure viscosity with a viscosity cup. For safety and accuracy, the fluid
temperature should be ≤35 °C.
An alternative method to detect a change in viscosity is the Stir Power indicator
in the Diagnostics screen (see Diagnostics). Higher viscosity causes greater load
on the stir motor. A significant change of viscosity can be seen as an increase in
Stir Power >1 %. Check the Stir Power while the fluid is ≤35 °C.
Since the 7109A can operate at temperatures colder than the environment’s dew
point, it is susceptible to water condensing into the fluid. Avoid extended
operation at temperatures below the environment, especially with the tank open.
To remove condensed water, set the setpoint to 100 °C and hold that
temperature for an hour to let the water evaporate.
Drain the Bath Fluid
Occasionally it is necessary to drain the tank to replace the bath fluid or transport
the Product. A clean, wide-mouth container large enough to contain at least
2.5 liters of fluid is necessary.
Warning
To prevent personal injury, wear appropriate personal
protective equipment.
To drain the bath fluid:
1. Set the setpoint to 25 °C and wait for the Product to heat or cool to between
5 °C and 60 °C.
2. Switch off the Product and disconnect the mains power cord.
3. Remove the overflow container and pour its contents into the large container.
4. Remove all accessories.
5. Remove the drain cover.
6. Move the Product to the edge of the table so that the drain tube extends over
the edge.
7. Position the container on a platform under the drain tube so that the fluid falls
into the mouth of the container. Be aware that pressure will cause the fluid to
flow outward.
8. Unscrew and remove the drain plug. As the bath fluid flows out into the
container, watch carefully to ensure the container stays properly positioned to
catch all the fluid.
9. After the fluid stops, lift the front of the Product to funnel any fluid that
remains into the drain tube.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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