The S-503 relative humidity generator enables the user to calibrate relative humidity (rh) sensors and transmitters. It can generate and hold rh values from 10 percent to 90 percent in 0.1 percent rh steps. The unit stabilizes to within 0.5 percent rh of the set point in about 10 minutes. It has ports to test up to seven rh transmitters simultaneously. The S-503 is equipped with a 15-VDC supply to power units under test. A built-in LCD displays actual chamber rh and temperature, as well as the rh signals from the test units. A selector switch permits testing of transmitters with the most popular analog output formats, including 0-1, 0-5, and 0-10 VDC, and 4-20 mA current loop. It is available as a stand-alone instrument or as a kit complete with carrying case and accessories.

Rense Instrument Div., Process Measurement & Controls Inc., 11 Old Sugar Hollow Rd., Danbury, CT 06810; 203-792-8686; 203-743-2051 (fax);;

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