Noncontact Series UCL-200 includes intrinsically safe 2-wire model that measures at distances up to 18 ft; general-purpose 3-wire model with relays that measures up to 24.5 ft; and long-range, flange-mount, 3-wire model that measures up to 40 ft. Two-wire Series UCL-210 without relay measures levels up to 12 ft away. Sensors reside in NEMA 4x enclosure, output 4-20 mA, operate from -40 to +140°F, and are accurate to ±0.25% of span.