The 629H 0.02-25,000 Torr, Heated (45 or 100°C) Absolute Baratron® Capacitance Manometer is an improved version of the industry standard 629 capacitance manometer. The 629F process capacitance manometer is temperature controlled to either 45°C (accurate to 0.12% of Reading) or 100°C (accurate to 0.25% of Reading) , is , and includes improved temperature control electronics to provide superior long-term stability and repeatability. It has an optional external zero input, which accepts a voltage equal and opposite to the zero offset, to provide a zero output at zero pressure. The “At Temperature” LED/switch indicates that the sensor is at controlled temperature (either 45°C or 100°C). The 629H is available in Full Scale ranges down to 20 mTorr to accommodate today’s lower process pressures. Based on well established Baratron capacitance manometer technology, the sensor’s wetted surfaces are constructed of Inconel® for excellent resistance to corrosive gases. The stainless steel package provides a cleanroom compatible product. The 629H product is directly interchangeable with earlier 629 Baratron capacitance manometers, as well as many competitive products.