501 SERIES CONTINUOUS MULTI-GAS AMBIENT AIR MONITOR APPLICATIONS For simultaneous analysis of up to four gases in ambient air including O2, CO2, NO, NO2, CO, temperature, and % RH. Single gas versions are also available for H2S, SO2, HCL, Cl2, & NH3. FEATURES • All gas detectors contained in NEMA 12 or optional NEMA 4 wall-mounted enclosure • Separate sensor for each gas • Bright digital readout for each gas • Built-in sampling pump • Easy to maintain modular layout OPTIONS • Recorder output of 4-20mA or voltage for all gases • Isolated analog 4-20mA output available • Alarm lights and relay contacts for each gas with common 'Sonalert' audible alarm and reset button • Red strobe light mounted on top of analyzer • Low sample flow alarm • Multiple alarm points for measured gases • Multipoint sampling using Nova 402AS AutoSequencer CALIBRATION • On clean air or nitrogen for Zero • On analyzed calibration gas for Span NOVA ANALYTICAL SYSTEMS www.nova-gas.com NEMA 12 and NEMA 4 enclosures shown with optional red strobe light

DESCRIPTION The 501 Series four gas versions offer a choice of O2, CO2, CO, NO, & NO2. Single gas verions are also available with H2S, SO2, Cl2, HCL, & NH3. An O2 sensor may be added to the single gas versions to produce a toxic gas plus oxygen deficiency monitor. A built-in pump draws in the sample for analysis. A ¼" plastic tube may be attached to the analyzer to sample a different area, such as a room or confined space. Standard system comes with NEMA 12 enclosure, built-in sampling pump, flow meter, pre-filter, and liquid blocker. Alarm option - alarms may be provided for all gases. An optional...