APPLICATIONS Allows a single Nova gas analyzer to be time shared over many sample points. It can be controlled locally or by the customer's PLC. Applications include mushroom farms, multiple greenhouses, flue gas ducts, landfill wells, and many others. FEATURES • Available from 3 to 24 sample points selected by solenoid valves • Greatly reduces cost per sample point for multiple-zone analyses • Digital display of active sample point with time remaining countdown • Selectable sample time • Provides sample stream identification • Manual override with sample hold • Skip feature allows unwanted samples to be skipped over. • All samples continuously drawn into sequencer by built-in by-pass pump to keep non-active samples 'fresh'; only active sample point goes to analyzer, the rest are vented. OPTIONS • Relay contacts for each sample point • Available without micro-controller for connection to customer's PLC (Model 401S) NOVA ANALYTICAL SYSTEMS www.nova-gas.com Sample Lines from Monitored Zones 402AS Autosequencer Wallmount Enclosure 402AS Autosequencer Rackmount Enclosure Selected Sample Stream Sent to Gas Analyzer (sold separately)

DESCRIPTION The 402AS Automatic Sequencer allows a single Nova gas analyzer to be time shared between 3 to 24 sampling points. This greatly reduces the cost per sampling point for multiple-zone analyses. The 402AS consists of microprocessor based timing, a solenoid valve for each point and a by-pass pump. The by-pass pump continuously draws on all sample points so as to keep fresh sample always available for analysis. Inactive sample points can simply be skipped over. Also, the timer can be stopped on any one point and held there for as long as desired with a simple key press. A small keypad...