Testo NO Sensor Exchangeable Filter Cartridge

This Testo NO sensor replacement filter cartridge (SKU 0554 4150) is an essential spare part for anyone relying on a Testo 340 or Testo 350 emission analyser. It's designed to keep your Nitric Oxide sensor working accurately by blocking unwanted cross-sensitivity from Sulphur Dioxide (SO₂), ensuring your readings are precise.

When you're doing boiler tuning, engine maintenance, or general industrial emissions testing, precise data is critical. A clean, correctly functioning filter means reliable results the first time, preventing costly re-runs or misdiagnoses on site.

Best For

• HVAC technicians performing combustion analysis
• Industrial plant maintenance teams
• Engine tuners and mechanics
• Anyone using a Testo 340 or Testo 350 Emission Analyser

Compatibility

This exchangeable filter cartridge is specifically engineered for use with Testo 340 and Testo 350 Emission Analysers only. Its primary function is to block the cross-sensitivity of SO₂, ensuring accurate NO readings. If you're running a different model, check fittings and specs before ordering.

Features

• Blocks SO₂ Cross-Sensitivity: Ensures your NO sensor provides accurate data by preventing interference from Sulphur Dioxide.

• Genuine Testo Part: Guarantees perfect fit and performance with compatible Testo analysers.

• Easy to Exchange: Designed for quick and simple replacement in the field, minimising downtime.

• Compact and Lightweight: At just 6g, it's easy to carry spares without adding bulk to your kit.

Technical Specifications

What's in the Box

• 1 x Testo NO sensor replacement filter (SKU 0554 4150)

Using It on the Job

1. Power Down: Always ensure your Testo 340 or 350 analyser is powered off and disconnected from any power source before commencing work.
2. Access Sensor Bay: Refer to your analyser's manual for the correct procedure to open the sensor compartment. Handle with care.
3. Remove Old Filter: Gently extract the used NO sensor filter. Note its orientation for correct installation of the new one.
4. Install New Filter: Carefully insert the new Testo 0554 4150 filter, ensuring it seats correctly and securely within the housing. Avoid forcing it.
5. Reassemble & Calibrate: Close the sensor compartment, reassemble your analyser, and then power it on. It's good practice to perform a fresh zeroing or calibration as per the Testo operating instructions after any sensor or filter replacement.

Limitations & Safety Notes

• Only for use with Testo 340 and Testo 350 Emission Analysers. Do not attempt to use with other models or sensor types.
• Handle the filter cartridge carefully to prevent damage, as its integrity is crucial for accurate readings.
• Ensure the analyser is powered off and safely secured before opening sensor compartments for filter replacement.
• Follow all instructions in your Testo analyser's user manual for proper maintenance and filter exchange.

Tradie Pro Tip

Always carry a spare NO sensor filter for your Testo 340 or 350. It's a small part, but a blocked or degraded filter can throw off your readings and cost you time on site trying to troubleshoot what looks like a sensor issue. Better to have it on hand.

Pair With

Pair this filter with a Testo 340 or Testo 350 Emission Analyser. Consider also grabbing spare probes and calibration gas to keep your entire setup accurate and ready for any job.