425 SERIES CONTINUOUS PROCESS THERMAL CONDUCTIVITY ANALYZER FOR BINARY GAS MIXTURES APPLICATIONS For continuous analysis of many binary gas mixtures comprised of H2, CO2, O2, CH4, SO2, Ar, He, NH3, SF6, air, and others. Applications include heat treating atmospheres, welding gas mixtures, blanketing gas mixtures, ammonia synthesis, leak detection, purge monitoring, flue gas, magnesium blanketing by SF6, and others. FEATURES • Bright digital readout • Lower cost than infrared, GC, or mass spectrometer • High stability, microprocessor-controlled, long-life thermal conductivity (TC) cell • Easy-to-maintain modular layout • Built-in sample pump or pressure regulator • 4 - 20 mA output • Sensors temperature controlled for maximum stability OPTIONS • Hi/Low gas, low flow, and diagnostic alarms available • Isolated 4-20mA, RS232, RS485, MODBUS®, and Ethernet outputs available • Cabinet purge system available for use in hazardous areas • Automatic calibration with touch screen LCD display • Cold weather package for operation to -5°F (-20°C) • Cabinet coolers can be fitted to most models Wall Mount (N4) Enclosure • Air or nitrogen for zero • Analyzed calibration gas for span NOVA ANALYTICAL SYSTEMS www.nova-gas.com

DESCRIPTION The Nova 425 Thermalconductivity (TC) Analyzer has many applications in industry where the measurement of one gas in a two gas or some multi-gas mixtures is required. The Nova TC cell is temperature controlled and its high stability enables it to be used even in high purity measurements. Since the TC cell does not consume the sample, have any moving parts, hot wires, or sealed chemicals, it will last for many years. In operation, the TC cell detects the rate at which the sample gas conducts heat away from a heated Resistance Temperature Device (RTD) with reference to a similar heated...