Overview
This document provides a comparison between 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 precision capabilities.

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 and resolves concentrations twenty times smaller than the Smart system.

Key Specifications

• Floating Hood: Both systems have a 1.00 m² collection area.
• 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: Smart system has ≤ 10% / ≤ 5%, and the Expert system has ≤ 2%.
• CH4 Measuring Range: Smart system ranges from 0-1,000 ppmV, and the Expert system ranges from 0-10,000 ppmV.
• 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, and the Expert system has a 7" touch display.
• Measuring Interval: Smart system measures every 21 seconds per inlet, and the Expert system every 20 seconds per inlet.
• Cabinet Depth: Smart system is 400 mm deep, and the Expert system is 600 mm deep.
• Weight: Smart system weighs 55-70 kg, and the Expert system weighs 75-90 kg.
• Price Level: Smart system is priced at €€, while the Expert system is priced at €€€€.

Additional Features
Both systems are available 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 monitoring needs, while the Off-Gas System Expert is suited for high-precision applications requiring detailed emission analysis.