Super-Thermometer Readouts - 1575A and 1590 - Fluke Calibration Instruments - Hart Scientific - #1

both units and you'll understand why each is a great buy.

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. With all of these features, it's still less than half the price of a bridge.

In many labs with standards that re­quire the use of bridges, Super-Thermom­eters have been accepted as an alternative to bridges because they are a combination of bridge technology and mi­croprocessor-based solid-state electron-ics—and they're much easier to use.

Both Hart Super-Thermometers come with an accredited calibration.

The typical benchtop thermometer has an error level 5 to 10 times larger than the Super-Thermometer, and 20 to 40 times higher than a Super-Thermometer II. With common 25- or 100-ohm SPRTs, the 1575A Super-Thermometer achieves ± 0.002 °C accuracy and ± 0.001 °C accu­racy with a calibrated external standard resistor. The 1590 Super-Thermometer II is even better with ± 0.00025 °C accuracy.

ITS-90 specifies the use of 2.5-ohm and 0.25-ohm SPRTs as high-temperature standards up to the silver point (962 °C).

Hart's Super-Thermometers are recognized in metrology laboratories around the world for their ease of use and reliable accuracy. The Model 1575A Super-Thermometer is accurate to 0.001 °C. The Model 1590 Super-Thermometer II is accurate to 0.00025 °C, or 1 ppm.

Both Super-Thermometers are perfectly suited for SPRT calibrations. These are the best lab instruments to take advantage of SPRT accuracy. They're easy to use, they read temperature directly, they have auto­mated data collection, they automatically calculate constants for ITS-90, and both of them are priced at less than half the price of the competitors' resistance bridges.

Of course, there's more.

Resistance bridges are one of the most ex­pensive pieces of lab equipment you can buy. Most sell for $30,000 to $50,000. The resistance bridge market is very small, and there's hardly any competition. There's nothing to control the price except your willingness to pay.

Resistance bridges are difficult to use. Their learning curve is long and complex,

which means you'll spend plenty of time learning to master one. Time spent learn­ing costs you money, and costs multiply if you have to train other people!

So why buy a bridge if you have a le­gitimate alternative?

If 1 ppm accuracy gets the job done, the easiest and cheapest way to do it is with one of Hart's Super-Thermometers.

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. Read the features common to