Rense Instruments’S-503 relative humiditygenerator/calibrator can generate and hold RH values from 10-90 percentin 0.1 percent RH steps. The unit stabilizes to within 0.5 percent RHofthe set point in about 10 minutes and has ports to test up to sevenRH transmitters simultaneously. All models are CE marked. The system isequipped with the convenience of a 15 Vdc supply to powerunits-under-test. A built-in LCD shows actual chamber RH andtemperature, as well as the RH signals from the test units. A selectorswitch permits testing of transmitters with the most popular analogoutput formats, including zero to one, zero to five, and zero to 10 Vdc, and four to 20 mA currentloop.While intended forlaboratory use, at about 3.5 lbs the S-503 is small and light enough tobe portable. Available as a standalone instrument or as a kit withcarrying case and accessories, the S-503 is a good fit forthose needing a way to perform basic RH calibrations at a fraction ofthe cost of other test chambers.
