testo 350 Portable Industrial Flue Gas Analyzer

Overview

The testo 350 is a professional, portable measurement system for industrial emission measurement and combustion tuning. It consists of two parts: an analyzer box that contains the gas sensors, pump, gas preparation and probe connections, and a removable Control Unit with a large colour graphic display that shows readings and controls the measurement. One Control Unit can operate several analyzer boxes, and an analyzer box can also be run from a PC, a notebook or an Android smartphone or tablet using the free Testo app.

Seven Star LLC supplies the testo 350 to power stations, refineries, gas processing plants, desalination facilities and boiler service contractors throughout Oman and the GCC. Our engineers in Muscat help customers configure the sensor set, probes and accessories for their stacks and engines, and we provide engineering support for sites in Muscat, Sohar, Duqm and Salalah.

Measurement Principle

The analyzer box draws a flue gas sample through the probe and hose and passes it over electrochemical cells for O2, CO, NO, NO2, SO2 and H2S. Each cell produces a current proportional to the concentration of its target gas. The CO cells are H2 compensated, and a filter can be fitted to the NO sensor to block SO2 cross-sensitivity. CO2 is measured directly with an NDIR infrared sensor that includes absolute pressure measurement, while hydrocarbons such as methane, propane and butane are measured with a pellistor (CxHy) sensor. From these values the testo 350 calculates efficiency, flue gas loss, dew point and CO2.

Because electrochemical cells saturate at high concentrations, the instrument offers dilution. A single slot can be diluted with selectable factors of 2, 5, 10, 20 or 40, or all sensors can be diluted by factor 5, extending, for example, CO up to 50,000 ppm. The optional Peltier gas preparation cools the sample and removes condensate with a peristaltic pump, which prevents NO2 and SO2 from being absorbed in condensate and keeps readings stable during long measurements. A fresh air valve supports long-term measurement by automatically flushing the sensors.

Engineering Design of the testo 350

The testo 350 analyzer box has an industrial-standard housing with integrated impact protection, robust plug-in connections and closed chambers that keep dust and dirt away from the inside of the instrument, so downtime due to contamination is almost eliminated. Gas sensors and wearing parts are easy to reach and exchange on site. The analyzer box is equipped with an O2 sensor, a differential pressure sensor, thermocouple inputs for Type K NiCr-Ni and Type S Pt10Rh-Pt, an integrated combustion air NTC probe, a trigger input, data memory, a rechargeable battery and USB, and it can be upgraded to a maximum of six gas sensors.

The Control Unit weighs 440 g, measures 88 × 38 × 220 mm, stores up to 250,000 readings and runs about five hours on its lithium battery. Analyzer boxes and Control Units communicate over the Testo databus, which can link several analyzers to a PC with the easyEmission software. For integration into plant control systems, a testo 350 Modbus adapter provides Modbus RTU access, and an analog output box delivers six 4 to 20 mA channels for recorders.

Key Features

The testo 350 offers the following capabilities for industrial emission work:

• Modular configuration with up to six gas sensors selected from O2, CO, COlow, NO, NOlow, NO2, SO2, CO2 (NDIR), CxHy and H2S.
• Removable colour Control Unit, with the option to run the analyzer box from a PC, notebook or Android device.
• Single-slot dilution with factors up to 40 and all-sensor dilution by factor 5 for high gas concentrations.
• Optional Peltier gas preparation with automatic condensate removal for accurate NO2 and SO2 readings.
• Integrated differential pressure and flow velocity measurement with Pitot tubes, plus Type K and Type S temperature inputs.
• Rugged housing with impact protection and closed chambers that keep the instrument interior clean.
• Testo databus, easyEmission software, Modbus RTU adapter and 4 to 20 mA analog output options for data integration.
• TUV-tested design according to EN 50379-1 and -2, as stated in the Testo data sheet.

Industrial Applications

The testo 350 is used for emission compliance checks, burner and boiler tuning, monitoring of stationary gas and diesel engines, gas turbines, thermal processes and furnaces, and for verifying scrubbers and other flue gas treatment equipment. A dedicated SO2low set measures low sulfur dioxide levels after scrubbers, and industrial probe sets withstand flue gas temperatures up to 1,200 °C, or 1,800 °C with a ceramic shaft. Heated probe sets and hoses keep the sample above its dew point on wet or acidic gases.

In Oman, typical users are independent power producers, refinery and petrochemical units in Sohar, gas compression stations in the interior, district cooling plants and service companies that tune boilers and generators for hotels and hospitals. Seven Star LLC supplies the testo 350 as a trusted supplier and also supports continuous analyzers for permanent installations, such as the Servomex SERVOTOUGH Laser 3 Plus combustion analyzer, the ABB Endura AZ40 oxygen and CO analyzer and the Teledyne 3000RS oxygen analyzer.

Technical Specifications

The testo 350 values below are taken from the Testo data sheet for the testo 350 flue gas analyzer for industry.

How to Order

To order the testo 350, send Seven Star LLC an RFQ listing the gases, ranges, probe lengths and flue gas temperatures you need to cover, or share your existing analyzer configuration. Our team in Muscat will propose a sensor and accessory set, confirm availability and lead time, and supply the Testo data sheet for download. Seven Star LLC supplies Testo measuring instruments across Oman and the GCC with engineering support in Muscat.