Thermocouple Calibration Furnace Model 9112
Features |
Combined stability and uniformity better than
±0.4°C |
RS-232 serial interface standard |
High capacity for simultaneous comparison
calibrations |
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information, to request a catalog or for a Price Quote
Specifications |
Range |
300°C to 1100°C
(572°F to 2012°F) |
Stability |
±0.05°C at 300°C
±0.1°C at 700°C
±0.1°C at 1100°C |
Uniformity |
±0.05°C at 300°C
±0.2°C at 700°C
±0.3°C at 1100°C |
Heating Rates |
700°C to 900°C, 145°C/hour on
low; 900°C to 1000°C, 370°C/hour on high |
Cooling Rates |
Nom. at 800°C ³300°C/hour Nom. at 600°C ³180°C/hour |
Stabilization Time |
Typically 2 hours midrange, slower
at low-temperature end (4 hours), faster at high-temperature end |
Interface |
RS-232 included on all units |
Outside Dimensions |
18" H x 13.25" W x
26" D (457 x 337 x 660 mm) |
Thermal Blocks |
Block A: 11.5" (292
mm) immersion
Block B: 16" (406 mm) immersion (for Au-Pt TCs)
Each includes four wells at 1/4" (6.35 mm) |
Weight |
72.5 pounds (33 kg) complete [63.5
pounds (28.8 kg) w/o block] |
Power |
230 VAC (±10%), 50/60 Hz,
16 A, 3700 W |
Heater |
3700 W high,
925 W low |
NIST-Traceable Calibration |
Data at 420°C |
Need the most accurate thermocouple calibrations possible? The Hart Model
9112 Thermocouple Furnace gives you a broad temperature range to 1100°C, stability up to
±0.05°C and all at an excellent price. In addition, this year we’re offering
optional Calibrate-it software that
completely automates the furnace and calibration processes.
Alternative calibration tools such as a sand bath or fluidized alumina
bath have been used for calibrations up to 700°C but with very poor comparative
performance. Gradients of several degrees are common in a sand bath, along with poor
stability, resulting in low-accuracy calibrations. Sand baths are also known to create a
troublesome dust problem. Why buy poor performance and lab pollution?
Calibration furnaces are an excellent alternative to sand baths,
especially for thermocouples, RTDs and optical fiber probes. With a five-hole standard
block and custom blocks available, the 9112 doesn’t limit the size and shape of
sensors you can calibrate the way other furnaces do. In addition, most calibration
furnaces have poor stability.
Hart’s new 9932 Calibrate-it
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. Read more about our software
packages.
The 9112 employs a special heater pattern 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 itself 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 for
calibration. 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. The standard
block accommodates probes 12 inches or longer. Shorter probes are calibrated by placing
the tip of the standards thermometer at the same depth or by ordering a custom-sized
assembly to accept your special probes. Custom isothermal blocks can handle a specific
number of probes with different diameters and depths. Call our sales department for a
custom quote.
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
where 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 block delivers uniformity of ±0.05°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 9112 design. Thermocouples, RTDs, optical fiber
probes and other special sensors or materials are all tested or calibrated with a greater
level of confidence and accuracy.
Use our Feedback Form
for more information, to request a catalog or for a Price Quote
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