Solid-state, electro-optic Model ELS-1150 works reliably in -40 to +212°F areas under pressures as high as 2,500 psi. NO or NC transistor output switches max 18 mA. Sensor measures 1.38 in. long; threads into 1/2 in. NPT orifice with 7/8 in. hex wrench; requires 5 or 12 Vdc; and incorporates glass prism fused to carbon steel/stainless steel housing.