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The 402AS Automatic Sequencer allows a single Nova gas analyzer to be time shared between 3 to 12 sample points. This greatly reduces the cost per sample point for multi-zone applications that do not need continuous uninterupted measurement.

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 allows easy data entry.

Another variation is the lower cost 401S sequencer which is available to customers with their own computer or PLC to control timing. The 401S contains the sample selecting solenoid valves and the by-pass pump. Activation of the solenoid valves would then be controlled directly by the customer's computer or PLC. Flow meters with valves are provided for each incoming sample line in either version for flow balancing.

Specifications

Method of Detection

 N/A No detection; sequences sample streams to (separately sold) analyzer for detection

Ranges Available

 N/A Any between 3-12 samples

Ambient Temperature Range

 N/A 32 to 122°F (0 to 50°C), Lower temperatures (-5°F, -20°C) with Cold Weather Package

Size & Weight

 N/A Dimensions will vary depending on enclosure style, number of sample points and options and required

Power

 N/A 115 VAC, 60 Hz 220 VAC, 50 Hz

Output Options

 N/A 5V TTL, RS-485, or contact closure

Applications

N/A

    Allows a single Nova gas analyzer to be time shared over many sample points. It can be controlled locally or remotely. Applications include multiple greenhouses, mushroom farms, multiple flue gas ducts, multiple landfill well or area sampling.

Features

N/A

  • Available from 3 to 12 sample points selected by solenoid valves
  • Greatly reduces cost per sample point for multiple-zone analysis
  • 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 pump to keep non-active samples 'fresh'
  • Only active sample point goes to analyzer, the rest are vented.

Options

N/A

  • Microprocessor controlled by customer's PLC, or locally by Nova-supplied built-in controller
  • RS-232 or RS-485 output
  • Relay contacts for each sample point
  • Solenoid valves in 401S are available in 6V, 12V, 24V, and 24VAC/115VAC versions.
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