Testo 350XL Combustion Gas Analyser

Introduction to the Testo 350 Combustion Gas Analyser

The Testo 350XL complies with US EPA requirements although the US requirements call for

  1. CO measurements done with Electro-Checmical instead of NDIR
  2. NO & NO2 measurements done with Electro-Chemical instead of chemiluminescence

The two documents are EPA Testo (pdf) & ETV Statement (pdf)

The 350XL can be used for Diesel engines with the following provisions:

  1. The engine MUST be hot. DO NOT use this on a cold engine
  2. Watch the smoke levels, the probe may need a particulate filter if smoke levels get too high
  3. Limit the time to say 5 min at a time.
  4. Watch the temperature, the standard probe supplied is 1000°C which is fine, but if a low temperature probe is used it may get too hot for the probe

The 350XL can be used on Natural Gas and Diesel engines, but it should not be used on Petrol engines.

Minimum Logging Interval
The minimum logging interval for the Testo 350XL is 1 s

Notes on Carbon Monoxide Levels

0 to 9 parts per million (ppm) Normal - No Action: Typical from: outdoor sources, fumes from attached garages, heavy smoking, fireplace spillage and operation of unvented combustion appliances. With ambient conditions in this range, analysts may continue testing sequences.

10 to 35 parts per million (ppm) Marginal: This level could become problematic in some situations. Actions: Occupants should be advised of a potential health hazard to small children, elderly people and persons suffering from respiratory or heart problems. If the home has an attached garage, document CO levels in garage. Accept this level as normal for unvented appliances but not for vented appliances. If unvented appliances are in operation, recommend additional ventilation in the areas of operation. With ambient conditions in this range, analysts may continue testing to locate the CO source.

36 to 99 parts per million (ppm) Excessive: Medical Alert. Conditions must be mitigated. Actions: Ask occupants to step outside and query about health symptoms. Advise occupants to seek medical attention. If occupants exhibit any symptoms of CO poisoning, have someone drive them to a medical facility. Enter the building, open doors and windows to ventilate the structure. Turn off all combustion appliances until the CO level has been reduced to safe levels. If forced air equipment is available, continuous operation of the air handler is recommended at this time. If the home has an attached garage, document CO levels in garage. Test combustion appliances one at a time to determine the source of CO production. If an appliance is determined to be the source of CO production, it should be shut off and not used until a qualified technician with proper test equipment can service it.

100 - 200 parts per million (ppm) Dangerous: Medical Alert. Emergency conditions exist. Actions: Evacuate the building immediately and check occupants for health symptoms. Advise all occupants to seek medical attention. Occupants should have someone else drive them to a medical facility. If occupants exhibit symptoms of CO poisoning, emergency service personnel must be called. Evacuation is important, but Analysts must not subject themselves to excessive conditions. Maximum exposure time is 15 minutes. Open all doors and windows that can be done quickly. If the home has an attached garage, document CO levels in garage. Disable combustion appliance operation. Continually monitor indoor ambient levels while moving through the building. Once the atmosphere within the structure has returned to safe levels and the appliances have been turned back on, locate the source of CO production for corrective measures.

Greater than 200 parts per million (ppm) Dangerous: Medical Alert. Emergency conditions exist. Actions: Evacuate the building immediately and check occupants for health symptoms. Advise all occupants to seek medical attention. Occupants should have someone else drive them to medical facility. If occupants exhibit symptoms of CO poisoning, emergency service personnel must be called. Evacuation is important, but analysts must not subject themselves to these conditions. Do not stay inside or re-enter the building until conditions have dropped below 100 ppm. Open all doors and windows that can be done quickly without entering the structure. Call the local utility to shut off gas supply (if applicable and necessary). If the home has an attached garage, document CO levels in garage if possible to do so without being subjected to high levels of CO. Once the atmosphere within the structure has returned to safe levels, restore fuel supply to appliances. Operate and test the appliances one at a time to determine the source of CO production.

Additional Resources

Product Overview (ppsx)
Getting Started Guide (pdf)
Short Manual (pdf)