Testo CO Replacement Sensor (Low Range)

This Testo 0390 0078 CO replacement sensor is built for keeping your combustion analyser sharp, helping HVAC and plumbing techs maintain accurate readings on gas appliances. In Australia, checking for CO is critical for safety and compliance, especially with flued heaters and boilers.

After a few years of hard work, or if you've had a particularly rough run with dirty flues, these sensors can drift. Swapping it out ensures your analyser is giving you trustworthy numbers, vital for protecting occupants and avoiding re-work.

Best For

• Routine maintenance and servicing of Testo combustion analysers.
• Replacing faulty or aged CO sensors in compatible units.
• Ensuring accurate CO measurements during gas appliance commissioning and safety checks.

Compatibility

Designed as a direct replacement for compatible Testo combustion analysers. Features H2 compensation, making it suitable for a range of gas types where hydrogen might be present. If you're running a different model, check fittings and specs before ordering.

Features

• 0-500 ppm CO Range: Accurately measures low to moderate levels of carbon monoxide.
• 0.1 ppm Resolution: Provides fine detection for precise readings.
• H2 Compensated: Reduces interference from hydrogen, improving measurement accuracy in various gas mixtures.
• Genuine Testo Part: Ensures optimal performance and full compatibility with your Testo analyser.

Technical Specifications

What's in the Box

• 1x Testo 0390 0078 CO Replacement Sensor, Low

Using It on the Job

1. Power Down: Safely power down and isolate your Testo combustion analyser before proceeding.
2. Consult Manual: Refer to your specific analyser's instruction manual for detailed sensor replacement steps and any specific precautions.
3. Replace Sensor: Carefully remove the old CO sensor and install the new 0390 0078, ensuring correct orientation and a secure connection. Avoid touching the sensor surface directly.
4. Calibrate/Zero: Power up the analyser and perform any required calibration, zeroing, or fresh air adjustment procedure as per the manufacturer's guide. This step is critical for accuracy.
5. Verify Operation: Always test the analyser with a known CO source or in fresh air before relying on readings for critical safety checks on appliances.

Limitations & Safety Notes

• Requires installation into a compatible Testo combustion analyser model. Verify compatibility before purchase.
• Do not attempt to open, repair, or modify the sensor itself.
• Always follow the safety guidelines and service instructions provided in your Testo analyser's user manual.
• Proper calibration after replacement is essential to maintain measurement accuracy and ensure reliable operation.

Tradie Pro Tip: Keep a spare sensor on the truck, especially if your analyser is getting a bit old or sees a lot of use. Nothing worse than pulling up to a job, doing a pre-check, and finding your CO sensor is out of whack – it saves a return trip and keeps you efficient.

Pair With

Pair with Testo combustion analysers, calibration gases, and flue gas probes for a complete combustion analysis toolkit. Ensure your analyser is regularly serviced to maintain peak performance.