381 SERIES PORTABLE TRI-GAS ANALYZER FOR HYDROGEN/NITROGEN/AIR PURGING APPLICATIONS For checking purity of hydrogen (H2) in H2-cooled generators and synchronous converters. The Model 381 Series will also monitor the safe purging of H2 during shutdown or startup. This model is designed specifically for generators that are purged with nitrogen (N2) instead of carbon dioxide (CO2). FEATURES • Rugged design that is easy to operate and maintain • Fast warm up and response • Monitors 0-100% H2 in air, 0-100% H2 in N2, 0-100% Air in N2 • Long-life thermal conductivity H2 cell • Rugged long-life electrochemical O2 sensor • Digital readout displays active range • Rechargable battery operation • Built-in flow meter, flow control valve, and pump • Built-in pressure regulator prevents over pressuring of pump and sensor • Suitcase cabinet has carry handle and is weatherproof when closed • Sample pressure ranges 0.5 PSI to 125 PSI NOVA ANALYTICAL SYSTEMS www.nova-gas.com

DESCRIPTION The Nova 381 Series Tri-Gas Analyzer is designed for monitoring the H2 purity inside a power generator and to monitor the purging procedure during a generator shutdown or startup. This analyzer is specifically for generators that are purged with N2 instead of the more commonly-used CO2. The analyzer contains a temperature compensated thermal conductivity (T/C) cell, electochemical O2 sensor, amplifier board, digital readout, range switch, pressure regulator, gas flow control valve, pump and a flow indicator. A 4-20mA recorder output is standard. The T/C cell does not burn the sample...