--- title: Stack Gas Analysis System (SGI-320) | Sarvesh url: https://www.sarveshanalytics.com/applications/stack-and-emission-monitoring-system.html description: Plug-and-play extractive gas analyser system for boilers, HRSG, incinerators and engine exhaust: probe, heated line, conditioner, NO, SO2, CO, CO2, O2. updated: 2026-11-02 source: html --- Power, boilers and emissions # Stack gas analyser: SGI-320 hot extractive emission monitoring system SGI-320 is a ready-to-use extractive system for hot, wet stack gas. It includes a sample probe with auto-blowback, a heated sample line, a Peltier conditioner and the analysers for NO, SO2, CO, CO2 and O2, so site work is limited to installation and commissioning. - ISO 9001:2015, certified by TÜV - Designed and built in Pune since 2002 - Supplied to Reliance, Tata Steel, Indian Oil, Linde and ISRO Quick answer SGI-320 is a hot extractive emission monitoring system: a probe with auto-blowback, heated line, Peltier conditioner and analysers for NO, SO2, CO, CO2 and O2. It suits samples with SO2, NO and CO below 1000 ppm and excludes HCl, HF and H2S. Updated 2 November 2026 · Figures from Sarvesh datasheets ## The measurement and why it matters An extractive emission monitoring system pulls gas from the stack and delivers it to analysers. Between the stack and the analyser the gas must stay hot enough to avoid condensation, then be cooled and dried in a controlled way so that soluble gases such as SO2 and NO2 are not lost. Most failures of such systems are in the sampling, not the analysers. SGI-320 is built on the i-Cons approach. It controls cyclic blowback of the probe filter, with an automatic blowback if sample flow fails. It controls the heated hose temperature using a Pt100 input. A Peltier cooler with a PTFE heat exchanger and an inbuilt condensate sensor removes moisture, and the sample pump stops during blowback, calibration, condensate detection and hardware fault. The system keeps records of faults and of consumable use, and prompts for replacement. The measurement uses NDIR, paramagnetic and electrochemical techniques. Ranges per the SGI-320 datasheet are 0 to 200 or 0 to 1000 ppm for NO, SO2 and CO, 0 to 20 percent for CO2 by NDIR, and 0 to 25 percent for O2. An optional NOx converter and remote auto-calibration are available. ## Models and ranges | Model | Measures | Range | Sensor and notes | |---|---|---|---| | NO | Nitric oxide | 0 to 200 or 0 to 1000 ppm | Per SGI-320 datasheet | | SO2 | Sulphur dioxide | 0 to 200 or 0 to 1000 ppm | Per SGI-320 datasheet | | CO | Carbon monoxide | 0 to 200 or 0 to 1000 ppm | Per SGI-320 datasheet | | CO2 | Carbon dioxide | 0 to 20 % | NDIR | | O2 | Oxygen | 0 to 25 % | Paramagnetic or electrochemical | ## Process notes ### Boilers, HRSG, incinerators and engine exhaust Each source has its own dust, moisture and temperature. A coal boiler needs a probe that survives dust, a gas engine needs a sample line that handles pulsation, and an incinerator may need materials chosen for chlorinated gases. Send the source details and we will configure the probe, line and conditioner. ### Maintenance and diagnostics SGI-320 detects a choked probe filter and starts a blowback to clear it. When it detects condensate carryover it removes the water before restarting the sample. It tracks the health of the system and shuts it down safely if a component fails, so a fault does not damage the analysers. ## Sampling and installation - Not suitable for samples containing HCl, HF, H2S or other highly corrosive, toxic or flammable gases. - Intended for samples where SO2, NO and CO are below 1000 ppm at the tapping point. - Send the sample composition for an application check before ordering. - We make no claim of statutory approval for emission reporting; send your regulatory requirement and we will say what the system meets. ## Send us your process data **What the data sheet asks for** Send what you have and we will ask for the rest. - The gases to measure, the range, and the accuracy you need - Background gases and their typical composition - Sample temperature, pressure and dew point at the tapping point - Dust level, and whether the gas carries tar, oil or condensable vapour - Process connection and, for ducts, the duct diameter - Where the sample vents to, and at what pressure - Area classification of the tapping point and of the analyser location, and the IP protection needed - Distance between the tapping point and the analyser - Outputs you need: 4-20 mA, dual range, relays, Modbus RTU - Calibration approach, calibration gas available, and whether blowback is required - Utilities at site: power supply, instrument air, nitrogen, steam and cooling water, and the ambient temperature range - Which pollutants you must report, and your regulatory requirement ## Recommended Sarvesh products [ ### i-Cons The conditioner at the heart of SGI-320. View i-Cons ](https://www.sarveshanalytics.com/smart-systems-for-gas-analyser.html)[ ### SP and SRP sample probes Heated probes with blowback. View SP and SRP sample probes ](https://www.sarveshanalytics.com/sample-probes.html)[ ### ACCURRA-Zr In-situ oxygen where extraction is not needed. View ACCURRA-Zr ](https://www.sarveshanalytics.com/flue-gas-analysers.html) ## Frequently asked questions **Is SGI-320 approved for statutory emission reporting?** We make no statutory approval claim. Send your regulatory requirement and we will state what the system meets. **What gases can it measure?** NO, SO2 and CO to 200 or 1000 ppm, CO2 to 20 percent and O2 to 25 percent, per the datasheet. An optional NOx converter is available. **Where can I not use it?** On samples containing HCl, HF, H2S or other highly corrosive, toxic or flammable gases. **How long does commissioning take?** The system arrives as a complete assembly, which cuts site work. 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