Refrigeration Condenser Access Door; Bath Tank And Lid - Fluke 7341 User Manual

7341 Calibration Bath
User's Guide
7.2
7.3
24
5. The cooling switch turns on the refrigeration for control below 50°C and
rapid cool down. The cooling shuts off automatically above 60°C. Manually
turn off the refrigeration at temperatures where it has been determined to be un-
necessary. See Sections 8.6, Refrigeration, 9.13.2, Cooling Mode, and 9.13.3,
Hot Gas Bypass Mode.

Refrigeration Condenser Access Door

Located on the bottom front of the instrument is a refrigeration condenser ac-
cess door. Hinged on the right side, the door is opened by gripping the left side
and pulling outward.
This access to the condenser coil is provide so the user can keep the condenser
fins clean allowing unimpeded air flow insuring the condenser functions effi-
ciently. Both the vents in the door and the condenser fins should be kept clean.

Bath Tank and Lid

The bath tank and lid assembly includes: the tank, the control probe, the stir-
ring motor, the access hole, and the access hole cover. The stirring motor cover,
covers the stirring motor, cooling fan, and control probe.
• The bath tank is constructed of stainless steel. It is very resistant to oxida-
tion in the presence of most chemicals and over a wide range of tempera-
tures.
• The control probe provides the temperature feedback signal to the con-
troller allowing the controller to maintain a constant temperature. The
control probe is a precision platinum resistance thermometer (PRT). It is
delicate and must be handled carefully. The control probe is placed in the
small hole in the top of the bath so that the probe tip is fully immersed in
the bath fluid.
• The stirring motor is mounted on the bath tank lid. It drives the stirring
propeller to provide mixing of the bath fluid. Proper mixing of the fluid is
important for good constant temperature stability.
• On the bath lid is a large access hole. This is used for filling the bath with
fluids and placement of thermometers and devices into the bath.
• An access hole cover should be used to cover the access opening in the
top of the bath at all times. This improves bath temperature stability, pre-
vents excess fluid evaporation or fumes and increases safety with hot
fluid. The user may drill or cut holes in the cover to accommodate the in-
struments to be calibrated or immersed in the bath. Spare covers are avail-
able from Hart Scientific.
• A stainless steel baffle inside the tank insures proper fluid flow. It also
protects probes and thermometers from coming in contact with the stir-
rers. There are slots near the bottom of the baffle for insertion of the liq-
uid-in-glass adaptor.