Draining The Bath - Fluke 7012 User Manual

7012 Calibration Bath
User's Guide
12.1
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• If the mains supply cord becomes damaged, replace it with a cord with
the appropriate gauge wire for the current of the bath. If there are any
questions, contact an Authorized Service Center for more information.
• Before using any cleaning or decontamination method except those rec-
ommended by Hart, users should check with an Authorized Service Cen-
ter to be sure that the proposed method will not damage the equipment.
• If the instrument is used in a manner not in accordance with the equip-
ment design, the operation of the bath may be impaired or safety hazards
may arise.
WARNING: When checking the over-temperature cutout, be sure that the
temperature limits of the bath fluid are not exceeded. Exceeding the tem-
perature limits of the bath fluid could cause harm to the operator, lab, and
instrument.
• The over-temperature cutout should be checked every 6 months to see that
it is working properly. In order to check the user selected cutout, follow
the controller directions (Section 9.8) for setting the cutout. Both the man-
ual and the auto reset option of the cutout should be checked. Set the bath
temperature higher than the cutout. Check to see if the display flashes cut-
out and the temperature is decreasing.
• The constant temperature bath depends upon the certain qualities of the
fluid medium in order to maintain a uniform and stable temperature envi-
ronment. Some oils change their characteristics or become dirty after a
period of use. Always remove any foreign materials from the bath.
• Silicone oils as well as others may evaporate off their lighter components
over a period of time leaving the very viscous components remaining. In
addition, some decomposition occurs which may impair the temperature
stability of the bath. When this happens, the fluid is generally very dark to
black and viscous. Vegetable oils polymerize (turn plastic like) after they
have been used for a time at high temperatures making them very difficult
to remove. When the oil has become unusable it should be changed. The
instructions for removing the oil is as follows.

Draining the Bath

The drain is located on the back of the bath. See
the drain plug on the end of the drain tube. This drain plug is to be fluid tight
until the time of draining. The following information is helpful when draining
the bath. Always use a container capable of holding the entire load of fluid. Us-
ing an adequate size (about 8 gallons or 1 cubic foot), heat proof fluid container
is extremely important. Use safety equipment as appropriate.
1. Water and low viscosity fluids - Drain at room temperature. Normal care
must be taken for fluids that may have corrosive or damaging effects on
the surrounding facility or equipment.
Figure 4 on page 24. Locate