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American Fork, Utah lab
Hart’s NVLAP accredited Metrology Laboratory (lab code 200348) in American
Fork, Utah provides temperature calibrations from approximately –200 °C
to 1000 °C using fixed-point and comparison methods. Our accredited uncertainties
are among the lowest commercially available anywhere in the world. Our
prices are very competitive and our turn-around times are excellent. Our
reports are comprehensive and include as-found and as-left data as well
as pass/fail criteria (where applicable) and a concise statement of the
method used. Calibrations performed at Hart are traceable to NIST and meet
the new ISO 17025 requirements as described in the following pages.
For fixed-point calibrations, we use Hart fixed-point cells and apparatus,
Hart SPRTs as check standards, and conventional DC bridges with DC standard
resistors. Our fixed-point calibration procedures are based on CCT procedures,
so you can be confident that the technique is current, correct, and thorough. 
For comparison calibrations, we use Hart baths, Hart SPRTs, and Hart readouts.
We use several different techniques to minimize uncertainties while maximizing
efficiency to keep the costs as low as possible without compromising quality.
All Hart-manufactured instruments (except SPRTs and some thermocouples,
which come uncalibrated) are certified before they are shipped to you.
We don’t simply provide a “certificate of conformance” with a couple of
NIST numbers like some other manufacturers and then sock you with a high
fee if you require a proper calibration. We are the laboratory of choice
for many of our customers because they know that they can depend on us
for correct, complete, and on-time calibrations at reasonable prices.
Norwich, England lab
In 2003, after extensive planning and a significant capital investment,
Hart Scientific opened a primary temperature calibration laboratory in
Europe. This new lab in Norwich, England, will service the precision temperature
calibration needs of customers in Europe, the Middle East, and Africa.
The UK lab uses the same great Hart fixed point cells, furnaces, baths,
and thermometers used in the American Fork, Utah lab. We even have similarly
excellent metrology experts in this lab. Watch for us to also have UKAS
accreditation here soon, with similar uncertainties to that of Hart’s American
Fork, Utah lab!
Calibration Ordering Information
SPRT calibration by ITS-90 fixed point NVLAP accredited |
| All calibrations in this section include the following: (1) calibration
at two levels of current and extrapolation to zero power, (2) ITS-90 deviation
function coefficients and interpolation tables for the nominal current
calibration and the zero-power calibration in W vs. T
90
, and (3) analysis
for compliance to ITS-90 criteria for a standard interpolating instrument
of the ITS-90. This represents our best measurement capability(BMC) for
SPRTs. Recommended when you absolutely must have the best uncertainty possible.
Only Excellent SPRTs qualify. |
Order No. |
Temperature |
ITS-90 Subranges |
Fixed Points Used |
Temperature |
Uncertainty |
–197 °C (LN2) |
0.60 mK |
–38.8344 °C (TPHg) |
0.35 mK |
0.010 °C (TPW) |
0.20 mK |
29.7646 °C (MPGa) |
0.35 mK |
156.599 °C (FPIn) |
0.70 mK |
231.928 °C (FPSn) |
0.90 mK |
419.527 °C (FPZn) |
1.2 mK |
660.323 °C (FPAl) |
2.0 mK |
| 961.78 °C (FPAg) |
8.0 mK |
|
1910-4-7 |
–200 °C to 660 °C |
4, 7 |
comp at NBPLN2, TPHg, TPW, FPSn, FPZn, FPAl |
1910-4-8 |
–200 °C to 420 °C |
4, 8 |
comp at NBPLN2, TPHg, TPW, FPSn, FPZn |
1910-4-9 |
–200 °C to 232 °C |
4, 9 |
comp at NBPLN2, TPHg, TPW, FPIn, FPSn |
1910-5-7 |
–40 °C to 660 °C |
5, 7 |
TPHg, TPW, MPGa, FPSn, FPZn, FPAl |
1910-5-10 |
–40 °C to 157 °C |
5, 10 |
TPHg, TPW, MPGa, FPIn |
1910-7 |
0 °C to 660 °C |
7 |
TPW, FPSn, FPZn, FPAl |
1910-8 |
0 °C to 420 °C |
8 |
TPW, FPSn, FPZn |
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SPRT calibration by ITS-90 fixed point NVLAP
accredited |
All calibrations in this section include the following: (1) calibration
at two levels of current and extrapolation to zero power, (2) ITS-90 deviation
function coefficients and interpolation tables for the nominal current
calibration and the zero-power calibration W vs. T
90
, and (3) analysis
for compliance to ITS-90 criteria for a standard interpolating instrument
of the ITS-90. Recommended for working standard SPRTs, when slightly larger
uncertainties are acceptable. |
Order No. |
Temperature |
ITS-90 Subranges |
Fixed Points Used |
Temperature |
Uncertainty |
–197 °C (LN2) |
1.0 mK |
–38.8344 °C (TPHg) |
0.8 mK |
0.010 °C (TPW) |
0.5 mK |
29.7646 °C (MPGa) |
0.8 mK |
156.599 °C (FPIn) |
1.5 mK |
231.928 °C (FPSn) |
1.5 mK |
419.527 °C (FPZn) |
1.8 mK |
660.323 °C (FPAl) |
3.0 mK |
|
1911-4-7 |
–200 °C to 660 °C |
4, 7 |
comp at NBPLN2, TPHg, TPW, FPSn, FPZn, FPAl |
1911-4-8 |
–200 °C to 420 °C |
4, 8 |
comp at NBPLN2, TPHg, TPW, FPSn, FPZn |
1911-4-9 |
–200 °C to 232 °C |
4, 9 |
comp at NBPLN2, TPHg, TPW, FPIn, FPSn |
1911-5-7 |
–40 °C to 660 °C |
5, 7 |
TPHg, TPW, MPGa, FPSn, FPZn, FPAl |
1911-5-10 |
–40 °C to 157 °C |
5, 10 |
TPHg, TPW, MPGa, FPIn |
1911-7 |
0 °C to 660 °C |
7 |
TPW, FPSn, FPZn, FPAl |
1911-8 |
0 °C to 420 °C |
8 |
TPW, FPSn, FPZn |
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SPRT calibration by ITS-90 fixed point NVLAP accredited |
All calibrations in this section include the following: (1) ITS-90 deviation
function coefficients and interpolation table for the nominal current calibration
W vs. T
90
, and (2) analysis for compliance to ITS-90 criteria for a standard
interpolating instrument of the ITS-90. This larger uncertainty SPRT calibration
is still better than most offered in the industry, and is easier on the
wallet. Recommended for any SPRT. |
Order No. |
Temperature |
ITS-90 Subranges |
Fixed Points Used |
Temperature |
Uncertainty |
–197 °C (LN2) |
2.0 mK |
–38.8344 °C (TPHg) |
2.0 mK |
0.010 °C (TPW) |
2.0 mK |
29.7646 °C (MPGa) |
2.0 mK |
156.599 °C (FPIn) |
3.0 mK |
231.928 °C (FPSn) |
4.0 mK |
419.527 °C (FPZn) |
6.0 mK |
660.323 °C (FPAl) |
8.0 mK |
|
1912-4-7 |
–200 °C to 660 °C |
4, 7 |
comp at NBPLN2, TPHg, TPW, FPSn, FPZn, FPAl |
1912-4-8 |
–200 °C to 420 °C |
4, 8 |
comp at NBPLN2, TPHg, TPW, FPSn, FPZn |
1912-4-9 |
–200 °C to 232 °C |
4, 9 |
comp at NBPLN2, TPHg, TPW, FPIn, FPSn |
1912-5-8 |
–40 °C to 420 °C |
5, 8 |
TPHg, TPW, MPGa, FPSn, FPZn |
1912-5-9 |
–40 °C to 232 °C |
5, 9 |
TPHg, TPW, MPGa, FPIn, FPSn |
1912-5-10 |
–40 °C to 157 °C |
5, 10 |
TPHg, TPW, MPGa, FPIn |
1912-7 |
0 °C to 660 °C |
7 |
TPW, FPSn, FPZn, FPAl |
1912-8 |
0 °C to 420 °C |
8 |
TPW, FPSn, FPZn |
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Precision PRT calibration by ITS-90 fixed point NVLAP accredited |
All calibrations in this section include the following: (1) ITS-90 deviation
function coefficients and interpolation tables for the nominal current
calibration in resistance vs. T90. Recommended for high quality, secondary
standard PRTs only. Hart models 5626, 5628, and 5614 qualify. |
Order No. |
Temperature |
ITS-90 Subranges |
Fixed Points Used |
Temperature |
Uncertainty |
–197 °C (LN2) |
6.0 mK |
–100 °C |
10.0 mK |
–38.8344 °C (TPHg) |
6.0 mK |
0.010 °C (TPW) |
4.0 mK |
156.599 °C (FPIn) |
6.0 mK |
231.928 °C (FPSn) |
6.0 mK |
419.527 °C (FPZn) |
9.0 mK |
660.323 °C (FPAl) |
14.0 mK |
|
1913-4-7 |
–200 °C to 660 °C |
4, 7 |
comp at NBPLN
2
, comp at –100 °, TPHg, TPW, FPIn, FPSn, FPZn, FPAl |
1913-4-8 |
–200 °C to 420 °C |
4, 8 |
comp at NBPLN
2
, comp at –100 °, TPHg, TPW, FPIn, FPSn, FPZn |
1913-4-9 |
–200 °C to 232 °C |
4, 9 |
comp at NBPLN
2
, TPHg, TPW, FPIn, FPSn |
1913-5-8 |
–40 °C to 420 °C |
5, 8 |
TPHg, TPW, FPIn, FPSn, FPZn |
1913-5-9 |
–40 °C to 232 °C |
5, 9 |
TPHg, TPW, FPIn, FPSn |
1913-7 |
0 °C to 660 °C |
7 |
TPW, FPIn, FPSn, FPZn, FPAl |
1913-8 |
0 °C to 420 °C |
8 |
TPW, FPIn, FPSn, FPZn |
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Precision PRT calibration by comparison NVLAP accredited |
All calibrations in this section include the following: (1) ITS-90 deviation
function coefficients, and (2) interpolation table in 1-degree increments
in terms of resistance vs. T90. Recommended for high quality, secondary
standard PRTs, where higher uncertainty is acceptable. Hart models 5626,
5628, 5612, 5613, and 5614 qualify. |
Order No. |
Temperature |
Comparison Points Used |
Temperature |
Uncertainty |
| –200 °C |
10 mK |
| –100 to –50 °C |
10 mK |
| –50 to 0 °C |
8 mK |
| 0.010 °C |
6 mK |
| 0 to 200 °C |
9 mK |
| 200 to 300 °C |
12 mK |
| 300 to 400 °C |
14 mK |
| 400 to 550 °C |
16 mK |
|
1922-4-R |
–200 °C to 500 °C |
–197.0 °C, –100 °C, –38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C, 419.5 °C, 500 °C |
1922-4-8 |
–200 °C to 420 °C |
–197.0 °C, –100.0 °C, –38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C, 419.5 °C |
1922-5-8 |
–40 °C to 420 °C |
–38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C, 419.5 °C |
1922-5-9 |
–40 °C to 232 °C |
–38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C |
1922-R |
0 °C to 500 °C |
0.01 °C, 156.6 °C, 231.9 °C, 419.5 °C, 500 °C |
1922-8 |
0 °C to 420 °C |
0.01 °C, 156.6 °C, 231.9 °C, 419.5 °C |
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PRT (RTD) calibration by comparison NVLAP accredited |
All calibrations in this section include the following: (1) fitted results
with an appropriate equation and (2) interpolation table in 1-degree increments
in terms of resistance vs. T90. Recommended for all industrial level PRT
(RTD) probes. Hart models 5627, 5622, and 5618A qualify. |
Order No. |
Temperature |
Comparison Points Used |
Temperature |
Uncertainty |
–200 °C |
25 mK |
–100 to –50 °C |
25 mK |
–50 to 0 °C |
25 mK |
0.010 °C |
25 mK |
0 to 200 °C |
25 mK |
200 to 300 °C |
25 mK |
300 to 400 °C |
40 mK |
400 to 550 °C |
50 mK |
|
1923-4-R |
–200 °C to 500 °C |
–197.0 °C, –100.0 °C, –38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C, 419.5 °C, 500 °C |
1923-4-8 |
–200 °C to 420 °C |
–197.0 °C, –100.0 °C, –38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C, 419.5 °C |
1923-4-N |
–200 °C to 300 °C |
–197.0 °C, –100.0 °C, –38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C, 300 °C |
1923-4-9 |
–200 °C to 232 °C |
–197.0 °C, –100.0 °C, –38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C |
1923-5-8 |
–40 °C to 420 °C |
–38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C, 419.5 °C |
1923-5-N |
–40 °C to 300 °C |
–38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C, 300 °C |
1923-5-9 |
–40 °C to 232 °C |
–38.8 °C, 0.01 °C, 156.6 °C, 231.9 °C |
1923-N |
0 °C to 300 °C |
0.01 °C, 156.6 °C, 231.9 °C, 300 °C |
1923-9 |
0 °C to 232 °C |
0.01 °C, 156.6 °C, 231.9 °C |
1923-10 |
0 °C to 157 °C |
0.01 °C, 100 °C, 156.6 °C |
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Precision thermistor calibration by comparison
NVLAP accredited |
All calibrations in this section include the following: (1) polynomial
solution with coefficients in Steinhart-Hart or third order, and (2) bound
interpolation table in 0.01- or 0.1-degree increments (depending upon span
of calibration) in terms of resistance vs. T90. Order the 1925-A for secondary
thermistors with 100 °C range, like the Hart 5610 & 5611 probes. The 1925-B&C
calibrations are recommended for very high accuracy thermistor standards
like the Hart 5640-44 series probes. |
Order No. |
Temperature |
Comparison Points Used |
Uncertainty (k=2) |
1925-A |
100 °C span |
6 points over span |
10 mK |
1925-B |
60 °C span |
7 points over span |
1.5 mK |
1925-C |
100 °C span |
11 points over span |
2.5 mK |
1925-D |
10 °C span |
4 points over span |
<10 mK |
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Noble-metal thermocouple calibration by ITS-90 fixed point NVLAP accredited |
All calibrations in this section include the following: (1) ITS-90 polynomial
coefficients in accordance with NIST Monograph 175, and (2) bound interpolation
table in 1-degree increments in terms of EMF vs. T90. Recommended for high
quality thermocouple standards. Order 1918-A for Au/Pt thermocouple standards,
1918-B for Type S and Type R standards. |
Order No. |
Temperature |
Fixed Points Used |
Uncertainty (k=2) |
Extrapolated Uncertainty (k=2) |
1918-A |
0 °C to 1000 °C |
FPSn, FPZn, FPAl, FPAg (Gold/pt) |
0.02 °C |
0.025 °C |
1918-B |
0 °C to 1450 °C |
FPSn, FPZn, FPAl, FPAg (Type S–R) |
0.15 °C |
2 °C |
Requirements for thermocouples: Must have very clean, unbroken (even uncracked)
sheaths, have at least 20” long sheath length, and have at least 36” lead
length. Please call our customer service department for clarification if
needed. |
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Precision Digital Thermometer System Calibration by Comparison NVLAP Accredited |
All calibrations in this section include as-found data, as-left system
data, and adjustments. Systems are calibrated as systems and not as individual
components (probe and readout). Uncertainties are similar to those listed
on the opposite page, depending on the system being calibrated. Consult
Hart's customer service group for temperature ranges not listed here. An
additional fee is charged for non-standard temperature points requested. |
Order No. |
Temperature |
Comparison Points Used |
1930-4-R |
–200°C to 500°C |
–197.0°C, –38.8°C, 0.01°C, 231.9°C, 419.5°C, 500.0°C |
1930-4-8 |
–200°C to 420°C |
–197.0°C, –38.8°C, 0.01°C, 231.9°C, 419.5°C |
1930-D-8 |
–100°C to 420°C |
–100.0°C, –38.8°C, 0.01°C, 231.9°C, 419.5°C |
1930-5-8 |
–40°C to 420°C |
–38.8°C, 0.01°C, 231.9°C, 419.5°C |
1930-5-9 |
–40°C to 232°C |
–38.8°C, 0.01°C, 156.6°C, 231.9°C |
1930-8 |
0°C to 420°C |
0.01°C, 231.9°C, 419.5°C |
1935-A |
100°C span |
6 points over span |
1935-B |
60°C span |
7 points over span |
1935-C |
100°C span |
11 points over span |
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Fixed Point Cell Direct Comparison NVLAP Accredited |
Comparison to a Hart working standard fixed-point cell. A comprehensive
calibration report is included. (For Best Measurement Capability comparisons,
please call Hart.) |
Order No. |
ITS-90 Fixed Point Cell |
Uncertainty (k=2) |
1904-Hg |
TPHg |
0.25mK |
1904-Tpw |
TPW |
0.10mK |
1904-Ga |
MPGa |
0.10mK |
1904-In |
FPIn |
0.70mK |
1904-Sn |
FPSn |
0.80mK |
1904-Zn |
FPZn |
1.00mK |
1904-Al |
FPAl |
1.80mK |
1904-Ag |
FPAg |
4.50mK |
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DC Resistance Calibration NVLAP Accredited |
Your DC resistors are compared to Hart’s standard resistors. A comprehensive calibration report is included. |
Order No. |
Resistance Range |
Uncertainty (k=2) |
1960 |
1 - 10 Ohm |
0.35 ppm |
1960 |
10 - 100 Ohm |
0.45 ppm |
1960 |
100 - 1000 Ohm |
0.60 ppm |
1960 |
1000 - 10000 Ohm |
0.70 ppm |
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Humidity Sensor Calibration |
All calibrations in this section are traceable to NIST and include certificates
compliant with ANSI/NCSL Z540-1 and ISO Guide 17025. As-found data, as-left
data, and adjustments are included. |
Order No. |
Temp. Points |
RH Points |
1980-A |
1 |
3 |
1980-B |
1 |
5 |
1980-C |
3 |
5 |
1980-D |
5 |
5 |
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Instrument Calibration |
For recalibration of Hart Scientific thermometer readouts and dry-wells
please call Hart Customer service. If you are calling from within the USA,
please call toll free (800) 438-4278 or (888) 538-4278. If you are calling
from outside of the USA please call (801) 763-1600. Calibration of Hart
thermometer readouts fall within Hart’s scope of accreditation. |
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Use our feedback form for more information.
|
Phone: 801-763-1600
