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Automation Software
Hart’s 9938 MET/TEMP II software lets you use your PC to
automate your calibrations. Not only does the software
operate the furnace, it also automates Hart readouts along
with the calibration procedures.
Unique Engineering
The 9112B employs a special heater design for temperature
uniformity and rapid heat rates. The heaters are embedded in
a refractory ceramic-fiber material, forming a two-piece
heating assembly. A quartz tube lines the entire test zone
of the furnace, insulating the isothermal block and your
work from the high-power heater windings while supporting
the block and further equalizing temperature distribution.
The isothermal block assembly is machined from a
high-nickel-content alloy for good thermal conductivity and
resistance to high-temperature oxidation. The central block
is sized for optimum balance between sufficient mass for
good stability/uniformity and small enough mass for rapid
heating/cooling and stabilization. The assembly makes use of
two smaller alloy blocks as thermal barriers and heat sinks.
Guide tubes connect the blocks and guide your probes to the
heart of the block. A thermal shield at the front of the
assembly prevents heat loss at the front of the furnace.
Multiple Probe Calibrations
The standard furnace block accepts up to four probes under
test and one reference probe. The four test holes take
1/4-inch-diameter probes, and the reference hole accepts the
slightly larger and typical standard type S thermocouple or
an SPRT. Custom isothermal blocks can handle a specific
number of probes with different diameters and depths. Call
our sales department for a custom quote.
Microprocessor Control
A microprocessor-based digital temperature controller makes
set-point adjustments fast and easy. Both set and actual
temperatures are simultaneously displayed for your
convenience. A fast push-button adjustment is used for
manual temperature settings. The controller is factory tuned
for best performance between 300°C and 1100°C when the
tuning function is set for automatic conformity to the
set-point requirements. When using the furnace below 300°C,
controller adjustments are made to achieve high stability.
The isothermal block design and the controller
auto-tuning combine to give you metrology-level performance.
The “B” block delivers uniformity of ± 0.1°C at the low end
and ± 0.3°C or better at the high-temperature end.
The stability figures quoted in our specification table
are for mid-term to long-term stability. Short-term
stability during a comparison calibration is even better.
Wide-range and high-temperature calibration work are now
easier and more affordable due to Hart’s innovative 9112B
design. Thermocouples, RTDs, and other sensors are all
calibrated with a greater level of confidence and accuracy. |
