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Model 9114
This furnace has a range of 100°C to 680°C, which includes the
indium, tin, zinc, and aluminum fixed points, all in one furnace.
The
9114 furnace has an inlet for use of clean dry air or inert gas to
initiate the supercool of a tin cell. Other furnaces require the
user to remove the hot and fragile tin cell from the furnace by
hand before cooling. In a Hart furnace, you simply turn on your
gas, monitor your cell during its supercool, and turn the gas off
when the freeze begins.
The
9114 is a three-zone furnace with the best in Hart digital
controller technology. Hart designs and builds proprietary
controllers that have a reputation of being the best in the
business. All of our fixed-point furnaces use them to achieve
excellent stability and uniformity.
For
easy access and visibility, all three zones are controlled from
the top of the unit. The primary controller can be set in 0.01°C
increments, and actual temperature is readable to two decimal
places.
The
freezing and melting process can be automated using eight preset,
user-programmable temperature settings. The top and bottom zones
are slaved to the primary zone using differential thermocouples. A
high-temperature PRT acts as the main control sensor for the best
accuracy, sensitivity, and repeatability.
Model 9115A
The 9115A Sodium Heat Pipe Furnace is specifically designed for
maintenance of aluminum and silver freeze-point cells.
It
has a temperature range of 550°C to 1000°C with gradients of less
than ± 0.1°C throughout. The sodium heat-pipe design provides a
simple, yet uniform, single heating zone that ensures very uniform
changes in states during heating and cooling.
Melting, freeze initiation, and plateau control for a variety of
freeze-point cells are possible by entering up to eight
set-points, ramp rates, and soak times. The controller displays
temperature in degrees C or F, and temperature feedback is done
via a thermocouple. Freeze-point plateaus of 8 to 10 hours are
typical, and 24 hours are possible under controlled conditions.
External cooling coils are included for circulation of tap water
to reduce chassis temperature and heat load to the lab.
Temperature cutouts protect your SPRTs and the furnace from
exposure to excessive temperatures.
Model 9116A
The Hart Scientific 9116A Furnace has a temperature range of
550 °C to 1100 °C and is designed for use in achieving aluminum,
silver, or copper freezing point measurements. An advanced high
temperature Sodium heat pipe extends usage to more than 1000 hours
at 1100 °C and 5000 hours at 982 °C. The heater is embedded in a
fiber ceramic insulating block. A hollow section through the
center contains the heat pipe.
The
minimum working temperature of the Sodium heat pipe is about
500 °C. Above that temperature, the sodium circulates throughout
the tube providing a uniform temperature zone for freezing point
measurements. With uniformity of ± 0.05 °C, zone adjustments are
eliminated simplifying installation and increasing throughput.
The
uniform temperature is maintained over the full length of the
metal freeze point cell. A programmable temperature controller
simplifies freeze initiation, melting and plateau control. Control
stability is ± 0.15 °C, the best in the industry, enabling
extension of freezing plateaus of quality fixed point cells for up
to 20 hours and longer. For compatibility with automation
programs, plateaus may be controlled through standard RS-232 and
optional IEEE-488 PC interfaces. |
