Temperature Calibration Equipment and Services
196Pages

Temperature Calibration Equipment and Services

2 See page 63 for more information. See page 144 for more information. See page 171 for more information. See page 58 for more information.

4 Primary Standards SPRTs Model RTPW Range Page 5681 25.5 Ù –200 °C to 670 °C 8 5683 25.5 Ù –200 °C to 480 °C 5684 0.25 Ù 0 °C to 1070 °C 5685 2.5 Ù 0 °C to 1070 °C 5698 25.5 Ù –200 °C to 670 °C 10 5699 25.5 Ù –200 °C to 670 °C 11 5686 25.5 Ù –260 °C to 232 °C 12 5695 25.5 Ù –200 °C to 500 °C Fixed-point cells Model Description Temperature Page 5901A-G TPW Cell, 12 mm ID with handle, glass shell 0.01 °C 14 5901A-Q TPW Cell, 12 mm ID with handle, quartz shell 0.01 °C 5901C-G TPW Cell, 13.6 mm ID with handle, glass shell 0.01 °C 5901C-Q TPW Cell, 14.4 mm ID with handle, quartz shell 0.01 °C...

Temperature Calibration Equipment 5 Apparatus Model Features/Use Page 7012 Maintains: triple point of water and gallium cells. Comparisons: –10 °C to 110 °C. 116 7037 Maintains: triple point of water and gallium cells. Comparisons: –40 °C to 110 °C. 7312 Maintains: two TPW cells. Compact size, runs quietly. Comparisons: –5 °C to 110 °C. 17 7341 Maintains: triple point of mercury cell. Comparisons: –45 °C to 150 °C. 108 9210 Maintains: mini triple point of water and mini gallium cells. Comparisons: –10 °C to 125 °C. 32 9230 Maintains: stainless steel gallium cell. Comparisons: 15 °C to 35...

Setting up a primary temperature standards lab is no small project. Decisions must be made about temperature range, uncertainty requirements, the types of standards you need, and the companies that can supply your standards. Whose products are reliable? Which company backs up its performance claims? Who provides after-sale support and training? Who really demonstrates the most integrity throughout your ownership experience? After all, substantial investments are being made, and in many cases the credibility of your lab can be affected by the outcome. So why does Hart Scientific claim to be...

SPRTs SPRTs are the only acceptable ITS-90 interpolation devices from the triple point of hydrogen (13.8033 K) to the freezing point of silver (961.78 °C). While most SPRT manufacturers lost their design capabilities years ago, Hart continues to develop new innovative designs with the lowest drift rates. Hart manufactures quartz SPRTs in four different temperature ranges, including capsule SPRTs for low temperatures, an ultra-stable SPRT for the range to 480 °C, and a new “working-standard” SPRT for the range to 660 °C. Our metal-sheath SPRTs include a 25.5-ohm, contamination- resistant...

Choosing the right platinum thermometer as your primary standard may be the most critical purchase decision in your lab. Unfortunately, other manufacturers are pretty secretive about how their SPRTs are made. They won’t tell you much more than you can already see by looking at one. Many of the leaders of a few decades ago have lost their original craftsmen and design scientists. Hart Scientific has one of only a few active SPRT design groups in the world today. So how do you know you’re making the best purchase? Self-proclaimed expertise shouldn’t convince you. You should expect some sound...

extended range SPRTs can’t match. Typical drift is less than 0.5 mK after 100 hours at 480 °C. 5684 and 5685: 0 °C to 1070 °C ITS-90 extended the use of the platinum thermometer from 630 °C to 962 °C. The 0.25-ohm HTPRT sensor uses a stripshaped support made from high-purity quartz glass. The 2.5-ohm model uses a quartz glass cross frame. Stability after thermal cycling is excellent, and the design is reasonably tolerant of vibration. Choose from 0.25-ohm or 2.5-ohm nominal RTPW values. In addition to meeting the resistance ratio requirements shown above, these thermometers meet the...

SPRTs. Art or science? It takes, in fact, quite a bit of both. The one thing not involved is mystery. That’s why Hart SPRTs always include detailed published specifications, including drift rates. Our newest SPRT is no exception. It was designed by the same Hart metrologists who have created a dozen different SPRT designs used in national labs around the world. And it performs just like we say it does. The 5698 Working Standard SPRT is a true SPRT. It meets the ITS-90 ratio requirements for SPRTs and includes a Hartdesigned, completely strain-free platinum sensor. With a 485-mm quartz...

SPRTs designed by Hart Scientific are known for their outstanding reliability and minimal long-term drift. They have been calibrated by national (and other primary) laboratories and proven repeatedly to outperform competitive models. Now Hart’s 5699 Extended Range Metal-Sheath SPRT combines all the advantages of a Hart-designed sensor with the protective sheathing materials that allow your SPRT to be used in virtually any furnace or bath with temperatures as high as 670 °C. Designed and manufactured by our primary standards metrologists, the strainfree sensing element in the 5699 meets all...

Sometimes you would like to make SPRT measurements but traditional SPRTs are too long or awkward for a particular application. Our miniature glass capsule SPRTs are perfect for cryogenics, calorimetry, and other metrology work requiring small SPRTs. These are true SPRTs. The high-purity platinum wire is hand-wound on a glass cross frame in a strain-free design. The glass capsule is designed to match the thermal expansion of the platinum wire to ensure a true seal at all operating temperatures. The capsules are pressure sealed and come protected in their own maple cases. Both models comply...

You’ve spent some serious money to equip your lab with some of the finest SPRTs in the world because they’re the most accurate temperature measurement instruments you can buy. Now that you’ve got them, part of your job is to keep them performing at their highest levels. You can do that with a Hart 9117 Annealing Furnace. All HTPRTs and SPRTs are subject to mechanical shock no matter how carefully you handle them. This shock changes the resistance characteristics of the platinum and shows up as temperature measurement errors. Annealing relieves the stress on the platinum sensor caused by...