testo 350 Pro Flue Gas Analyzer

Overview

The testo 350 Pro Flue Gas Analyzer is a field-deployable, modular emission measurement system engineered for compliance-grade flue gas analysis in industrial combustion processes, boiler efficiency audits, and environmental regulatory monitoring. It operates on the principle of electrochemical gas sensing (for O₂, CO, NO, NO₂, SO₂, H₂S, and HC) and non-dispersive infrared (NDIR) detection (for CO₂), combined with differential pressure transduction for volumetric flow calculation. Designed to meet the functional requirements of EN 50379-1 (portable flue gas analyzers), EN 15267-3 (QAL1 certification framework), and ISO 12039 (determination of gaseous pollutants from stationary sources), the instrument delivers traceable, audit-ready data for emissions reporting under national air quality regulations and EU Industrial Emissions Directive (IED) compliance workflows.

Key Features

• Modular sensor architecture supporting up to six simultaneous gas measurements — including O₂ (electrochemical), CO (H₂-compensated electrochemical), NO/NO₂ (dual electrochemical), SO₂, HC (catalytic bead), and CO₂ (NDIR) — with optional low-range or extended-range configurations.
• Integrated Peltier-cooled condensate separator with self-draining蠕动 pump (peristaltic pump), ensuring continuous dew point management during extended sampling (>8 h) without manual intervention.
• Patented sulfur-resistant probe tubing (PTFE-lined, 2 mm ID), engineered to minimize adsorption of acidic condensates and enable passive self-cleaning via gravity-assisted droplet shedding.
• Heated sensor modules (operating down to −5 °C ambient), enabling reliable low-temperature stack measurements without signal drift or freezing-induced failure.
• Dual differential pressure channels (−200 to +200 hPa and −40 to +40 hPa) for precise velocity profiling and mass flow rate derivation using ISO 5167-compliant pitot tube inputs.
• Automatic fresh air valve and CO auto-shutoff function protect sensor integrity during idle periods and high-CO exposure events, extending service life and reducing recalibration frequency.
• Rugged ABS housing (IP54-rated), magnetic rear mount, backlit graphical display, and drop-tested mechanical design optimized for industrial field use.

Sample Compatibility & Compliance

The testo 350 Pro is validated for direct sampling of hot, humid, and particulate-laden flue gases from coal-, oil-, gas-, biomass-, and waste-fired combustion systems. Its probe assembly (standard 700 mm, 500 °C max) accommodates both extractive and in-situ configurations. All gas sensors are calibrated per EN 50379-2 traceability protocols, with factory certificates traceable to NIST or PTB standards. The analyzer supports GLP/GMP-aligned data integrity through time-stamped, tamper-evident internal logging (250,000 readings), and complies with EU Measuring Instruments Directive (MID) Annex MI-005 for portable emission monitors. Optional firmware upgrades enable 21 CFR Part 11–compliant electronic signatures and audit trail generation when paired with testo’s certified software suite.

Software & Data Management

Data acquisition, configuration, and reporting are managed via testo’s proprietary ComSoft 5 software (Windows-based), which provides real-time visualization, automated report generation (PDF/CSV/XLSX), and customizable templates aligned with EPA Method 7E, VDI 3862, and DIN EN 14181 QA/QC requirements. The instrument features RS232 serial interface (with USB-to-serial adapter compatibility), Bluetooth 4.2 (optional), and integrated thermal printer for on-site hardcopy documentation. Internal memory retains full timestamped records—including ambient temperature (K-type thermocouple), flue gas temperature, differential pressure, and all measured gas concentrations—with automatic time synchronization via PC link. Firmware updates are delivered via encrypted .hex files to ensure cryptographic integrity.

Applications

• Combustion efficiency optimization (excess air, lambda, CO/O₂ ratio analysis)
• Annual emissions inventory calculation (SO₂, NOₓ, CO tonnage per EN 16795)
• Boiler tune-up and regulatory stack testing (e.g., TA Luft, MCERTS, State Implementation Plans)
• Waste-to-energy plant compliance monitoring (dioxin precursor screening via CO/HCl correlation)
• Research-grade flue gas characterization in pilot-scale carbon capture and storage (CCS) trials
• Academic laboratory instruction in environmental engineering and thermal systems diagnostics

FAQ

What gas species can be measured simultaneously?
Up to six gases concurrently: O₂, CO, NO, NO₂, SO₂, and either CO₂ (NDIR), HC, or H₂S — depending on installed sensor modules.
Is the instrument suitable for high-dust applications?
Yes, when used with optional particulate filter kits (e.g., testo 0554 0010 ceramic filter) and regular maintenance of the PTFE probe line.
Does it support automated zero/span calibration?
Manual zeroing with ambient air is supported; span calibration requires certified gas standards — no built-in span gas injection system.
Can it calculate mass emission rates (e.g., kg/h of NOₓ)?
Yes — using user-input cross-sectional area, flue gas temperature, and stoichiometric coefficients, the device computes volumetric flow and converts concentration values to mass flow per EN 14792.
What is the expected sensor lifetime under typical field conditions?
Electrochemical sensors typically last 24–36 months; NDIR CO₂ cells exceed 10 years. Lifetime is extended by heated operation, fresh-air purging, and avoidance of prolonged exposure to >100 ppm H₂S or Cl₂.