Introduction
This document provides a comparison of two off-gas monitoring systems used in wastewater treatment plants (WWTPs): the Off-Gas System Smart and the Off-Gas System Expert. Both systems share the same floating hood, gas path, and outdoor cabinet, but differ in their analyzers and applications.

Recommended Use

• Off-Gas System Smart: Suitable for operational monitoring, UWWTD accounting, process optimization verification, and permanent surveillance. It is adequate for readings in the two-digit ppm range.
• Off-Gas System Expert: Designed for precision measurement, low emission values, research-grade campaigns, and plants with optimized nitrogen removal. It offers high accuracy for low emission values.

Key Specifications

• Floating Hood: Both systems have a 1.00 m² collection area.
• Analyzers: Powered by SC300 / GA320, with the Expert system resolving concentrations twenty times smaller than the Smart system.
• N2O Detection Limit: Smart system has a limit of 10 ppmV, while the Expert system has a limit of 0.5 ppmV.
• N2O Resolution: Smart system resolves at 1 ppmV, whereas the Expert system resolves at 0.1 ppmV.
• Expanded Measurement Uncertainty: ≤ 10% for Smart and ≤ 2% for Expert.
• Humidity Compensation: Available only in the Expert system.
• CH4 Measuring Range: 0-1,000 ppmV for Smart and 0-10,000 ppmV for Expert.
• Sample Gas Inlets: Smart system supports up to 2 inlets, while the Expert system supports up to 6 inlets.
• Operation: Smart system has a 2.5" display, while the Expert system features a 7" touch display.
• Measuring Interval: 21 seconds per inlet for Smart and 20 seconds per inlet for Expert.
• Cabinet Depth: 400 mm for Smart and 600 mm for Expert.
• Weight Ready for Operation: 55-70 kg for Smart and 75-90 kg for Expert.
• Price Level: The Expert system is more expensive than the Smart system.

Additional Features
Both systems can be equipped with one or two measuring points, requiring only an additional hood, hose, and gas path for the second point. The gas path includes a condensate trap, filter, and DN 50 flow meter. The outdoor cabinet is rated IP 55 and IK 10, and is heated and ventilated.

Conclusion
The Off-Gas System Smart is ideal for general operational monitoring, while the Off-Gas System Expert is suited for high-precision applications requiring low emission detection and high accuracy.