Fluke Corporation Hart Scientific Division’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 or 4ppm. 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.
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 readout 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 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 electronics—and they’re much easier to use.