testo 300 Longlife Flue Gas Analyzer (O2, CO up to 4,000 ppm)

The Testo 300 Longlife flue gas analyzer is built for heating engineers handling daily installation and maintenance work. It gives you quick, accurate readings for flue gas, draught, pressure, ambient CO, and differential temperature, with an option to retrofit an NO sensor.

This unit combines years of measurement tech with a modern smart-touch interface and a tough build, making it a reliable mate on any job site. I've been in plenty of tight boiler rooms, and a fast, clear display like this really cuts down on time.

Best For

• Heating engineers
• HVAC service and maintenance teams
• Installers working with heating systems
• Building compliance testing

Compatibility

The Testo 300 Longlife is designed for flue gas measurement on a wide range of heating systems. It comes with O2 and CO sensors (up to 4,000 ppm) installed, and you can add an NO sensor later if your job requires it.

It's also compatible with various optional probes for tasks like gas flow pressure, gas pipe testing, differential temperature, and ambient CO measurement. If you're running a different model or need specific probe types, check the Testo catalogue for compatible accessories before ordering.

Features

• Smart-Touch Operation: Intuitive 5-inch HD display responds quickly, similar to a smartphone, making navigation through measurement menus easy.
• Longlife Sensors: High-quality O2 and CO sensors offer up to a 6-year service life, reducing replacement frequency and downtime.
• Automatic Sensor Protection: Extends the life of the sensors by protecting them during intensive daily use.
• On-Site Documentation: Create and save PDF measurement reports directly on the instrument, complete with customer data and a signature function.
• WLAN & Bluetooth Connectivity: Email reports straight from the job site via WLAN or print readings immediately with a compatible Bluetooth printer.
• Fast Zeroing: Ready to measure quickly from standby, so you're not waiting around between jobs.

Technical Specifications

Parameter	Details
Temperature - TC Type K (NiCr-Ni) Measuring Range	-40 to +1200 °C
Temperature Accuracy (0.0 to +100.0 °C)	±0.5 °C
Temperature Accuracy (Remaining Range)	±0.5 % of mv
Temperature Resolution (-40 to +999.9 °C)	0.1 °C
Temperature Resolution (Remaining Range)	1 °C
Differential Pressure - Piezoresistive Measuring Range	-100 to +200 hPa
Differential Pressure Accuracy (0 to +50.0 hPa)	±0.5 hPa
Differential Pressure Accuracy (+50.1 to +100.0 hPa)	±1 % of mv
Differential Pressure Accuracy (+100.1 to +200 hPa)	±1.5 % of mv
Differential Pressure Resolution	0.01 hPa
Flue Gas O2 Resolution	0.1 Vol.%
Flue Gas CO (internal sensor) Measuring Range	up to 4,000 ppm
Battery Life	10 hours
Display	Large 5-inch HD smart-touch

What's in the Box

• Testo 300 Longlife flue gas analyzer with O2 and CO sensor (up to 4,000 ppm)
• NO sensor (can be retrofitted, not included as standard)
• USB mains unit
• Testo Bluetooth Connector

Using It on the Job

1. Pre-site Check: Ensure the battery is charged (up to 10 hours run time) and the zeroing phase is complete for accurate readings. The Testo 300 can be used straight from standby, cutting down your wait time.
2. Probe Setup: Select and attach the appropriate flue gas probe (e.g., modular or flexible) using the quick-change click system. For safe operation, always check probe condition before inserting.
3. Connection & Measurement: Insert the probe into the flue, ensuring a good seal. The intuitive measurement menus guide you through flue gas, draught, pressure, ambient CO, or differential temperature readings on the 5-inch HD display.
4. Documentation: Use the smart-touch display to create and save PDF measurement reports on site. You can add customer data and get signatures directly on the instrument.
5. Report Sharing: Email reports via WLAN (using your phone as a hotspot) or print immediately with a compatible Bluetooth printer to keep your office and customers updated.
6. Post-use Care: After each job, carefully remove, clean, and store probes to maintain their accuracy and extend their service life. Avoid harsh solvents.

Limitations & Safety Notes

• Ensure you have the correct probe for the measurement task, as many are available separately.
• This unit is for flue gas analysis on heating systems; it's not designed for continuous industrial process monitoring without suitable accessories.
• Always follow manufacturer's instructions for probe insertion depths and positioning to get reliable readings.
• Regular calibration and maintenance of sensors are crucial to ensure accuracy, especially for compliance testing.
• Measurements involving combustion require adherence to local safety regulations and safe work practices.

When you're doing back-to-back jobs, the 10-hour battery life and quick zeroing on the Testo 300 are a real game-changer. Keep it in standby, and you can jump straight into the next system without wasting time waiting for it to cycle.

<2 style="color: #007acc; border-bottom: 2px solid #f0f0f0; padding-bottom: 8px; margin-top: 35px;">Pair With

Pair with Testo modular flue gas probes for versatile application on different flue diameters, or a Testo Bluetooth printer for instant hard copies on site. Don't forget to browse our range of Testo accessories for specific measurement tasks.