Featuring trapezoidal bead diaphragm, Series 604 is designed for use with air and non-corrosive gases and for pressure ranges from 0.08–4.0 in. wc, with switch points from 0.05–4.0 in. wc. Other features include integrated cable strain relief and multi-plated brass, silver palladium, or gold contacts. While typical uses include monitoring filter and fan pressures, other applications include system interlocks as well as alarms in ventilation ducts, fume hoods, and paint spray booths.