Temperature Calibration and Measurement Equipment

  
Process Calibrators

Readouts

Model

Probe Types

Accuracy

Features

Hart Scientific
1521and 1522

1521

PRTs, Thermistors

±0.025°C

Reads PRTs/RTDs to ±0.025°C and thermistors to ±0.005°C
INFO-CON connector allows interchangeable use of calibrated probes
INFO-CON eliminates errors from programming probe data Battery-powered, handheld thermometer; INFO-CON connector reads coefficients without programming.

1522

PRTs, Thermistors

±0.025°C

Stores up to 10,000 readings, plus 100 more on demand; reads PRTs and thermistors (calibrated or uncalibrated) interchangeably.

Hart Scientific 1504

1502A

PRTs

±0.004 °C at -100 °C
±0.006 °C at 0 °C
±0.009 °C at 100 °C
±0.012 °C at 200 °C
±0.018 °C at 400 °C
±0.024 °C at 600 °C

The 1502A Tweener features accuracy up to ±0.006 °C (the 1504 is even more accurate, up to ±0.002 °C). In addition, it reads 100-ohm, 25-ohm, and 10-ohm probes, has a resolution of 0.001 °C across its entire range, and is the smallest unit in its class. It also has an optional battery pack for completely portable operation.

1504

Thermistors

±0.002 °C at 0 °C
±0.002 °C at 25 °C
±0.004 °C at 50 °C
±0.010 °C at 75 °C
±0.020 °C at 100 °C

If you need more accuracy in a limited temperature range, the Model 1504 Tweener gives it to you as a thermistor readout. Thermistors are less fragile than PRTs and less likely to be impacted by mechanical shock. Thermistors are more sensitive to temperature, have faster response times, and come in many shapes for different applications.

Typical accuracy of a 1504 is ±0.002 °C with a resolution of 0.0001 °C.

Hart Scientific 1529

1529

PRTs, Thermistors, Thermocouples

PRT/ RTD

±0.004 °C at -100 °C
±0.006 °C at 0 °C
±0.009 °C at 100 °C
±0.012 °C at 200 °C
±0.018 °C at 400 °C
±0.024 °C at 600 °C

Four channels can all be measured simultaneously; battery-powered; logs up to 8,000 readings; flexible display.

2 channels PRT/thermistor and 2 channels TC, or 4 channels PRT/thermistor, or 4 channels TC

PRT/thermistor channels accept 2, 3, or 4 wires; TC inputs accept B, E, J, K, N, R, S, T, and Au-Pt TC types. (Support for C and U type thermocouples is available.

Hart Scientific
1560 Black Stack

1560

Black Stack Readout Base Unit

Reads SPRTs, RTDs, thermistors, and thermocouples
Any configuration you like up to eight modules
High-accuracy reference thermometer (to ±0.0013°C)
Automates precision data acquisition

It’s a reference thermometer with a NIST traceable calibration; it’s an automated calibration system reading your reference probe and sensors you’re testing; or it’s a high-accuracy data acquisition system. And it does each of these functions better than any other thermometer currently on the market.

2560

PRTs

±0.005°C

2 channels of 25W or 100W PRTs.

2561

HTPRTs

±0.013°C

2 channels to 1200°C.

2562

PRTs

±0.01°C

8 channels of 2-, 3-, or 4-wire RTDs.

2563

Thermistors

±0.0013°C

2 channels of resolution to 0.0001°C.

2564

Thermistors

±0.0025°C

8 channels for data acquisition.

2565

Thermocouples

±0.05°C

Reads all TC types with 0.0001 mV resolution.

2566

Thermocouples

±0.1°C

Reads any combination up to 12 channels of virtually any type of TC.

2567

1000W PRTs

±0.006

2 channels of high-resistance PRTs.

2568

1000W PRTs

±0.01

8 channels of high-resistance PRTs.

Hart Scientific
1575A and 1590

1575A

SPRTs, Thermistors

±0.001°C

The 1575A Super-Thermometer is a best-selling thermometer because of its ease of use, high accuracy, built-in software, and reasonable price. Temperature is read directly on the display in your choice of scales. There are no manual resistance-to-temperature conversions. Resistance is converted to temperature for you using the ITS-90 algorithm in any one of the instrument’s ranges. Up to 16 independent sets of probe characterizations can be stored in the 1575A’s memory. Switch SPRTs and simply call up its reference identification number. Forget the extensive, time-consuming setup required by resistance bridges.

1590

SPRTs, Thermistors

±0.00025°C

The 1590 Super-Thermometer II has all of the features of the 1575A, plus it has the unbeatable accuracy of 1 ppm and a color screen that tilts to create the best viewing angles.

The 7320 covers a range from -20 °C to 150 °C and the 7340 reaches even colder temperatures to -40 °C. Below 0 °C, these baths maintain an impressive stability of ±0.005 °C with uniformities better than ±0.006 °C.

5626

5628

100 ohm
±0.007 °C at 0 °C

25 ohm
±0.006°C at 0 °C

Calibration Uncertainty
±0.006 °C at –200 °C
±0.004 °C at 0 °C
±0.009 °C at 420 °C
±0.014 °C at 661 °C

-200 °C to 156 °C
for entire probe

Includes NVLAP-accredited calibration and table with R vs. T values in 1 °C increments from
-200 °C to 156 °C. ITS-90 coefficients included.

Precision RTD Freezer Probe

The 5623B, precision “freezer probe,” is specially sealed from the sensing element to the end of the probe cable, preventing ingress of moisture when exposed to temperatures as low as -200 °C. The entire assembly withstands temperatures over its full range (-200 °C to 156 °C), which is ideal for verification of freezers or autoclaves where a thermo-well isn’t available. The 5623B assembly can be fully immersed in fluids when the application may require use in a liquid bath. The 5623B is available in a 6.35 mm (0.25 in) dia. × 125 mm (6 in) long Inconel™ sheath. With accuracy (that includes calibration uncertainty and short-term drift) of ± 0.05 °C over its full range, the 5623B is just right as a secondary standard for calibration of other process sensors.

Six-inch and nine-inch 5627s are calibrated at -196 °C, -38 °C, 0 °C, 200 °C, and 300 °C. For the 12-inch version, the point at 300°C is replaced with a point at 420 °C.

Hart’s 9210 TPW Maintenance Apparatus provides built-in programming for the simple supercool-and-shake realization and maintenance of our 5901B Mini TPW Cell. Simply insert the cell, enter the “freeze” mode through the front-panel buttons, have your morning cup of coffee, and when the 9210 audibly alerts you, remove the Mini TPW Cell and give it a shake to initiate freezing a portion of the water. Re-insert the cell, change the program mode to “maintain,” and you’ve got 0.01 °C for the rest of the day with uncertainty of only ±0.0005 °C.

5901B Expanded Uncertainty (k=2); < 0.0002 °C
_____ Reproducibility: 0.00005 °C

Water cells are essential!
Triple point of water cells fill four critical purposes. First, they provide the most reliable way to identify unacceptable thermometer drift between calibrations—including immediately after a calibration if the thermometer has been shipped. Interim checks are critical for maintaining confidence in thermometer readings between calibrations. Second, they provide a critical calibration point with unequaled uncertainties.

Third, for users who characterize probes using ratios (that is, they use the ratios of the resistances at various ITS-90 fixed points to the resistance of the thermometer at the triple point of water, indicated by “W”), interim checks at the triple point of water allow for quick and easy updates to the characterizations of critical thermometer standards, which can be used to extend calibration intervals.

And lastly, the triple point of water is where the practical temperature scale (ITS-90) and the thermodynamic temperature scale meet, since the triple point of water is assigned the value 273.16 K (0.01 °C) by the ITS-90 and the Kelvin is defined as 1/273.16 of the thermodynamic temperature of the triple point of water.