Engine and Combustion
Tuning Simplified
The new 335 offers a powerful combination of advanced measuring capabilities that simplify boiler and burner tuning, set up, efficiency tuning, and troubleshooting. With the option of an NO or NO low sensor, NOx tuning and testing is simplified.
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Plug and Play Sensors
At the heart of the 335 are testo’s innovative pre-calibrated plug and play Smart Sensors. Plus they can be replaced in the field without calibration gases. Sensor output and calibration log can be displayed or printed to ensure accuracy. Auto dilution expands CO to 50,000 ppm.
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Built-in Diagnostics
More built-in conveniences include advanced moisture protection, intuitive diagnostics, expandable probe system and powerful data management. The unique "i" button is at your fingertips. Read battery levels, gas flow rate and water trap with a single press of a button.
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Sampling Probes
The 335 has a large array of sampling probe options to meet the
most demanding applications.
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Technical Data
| Parameter |
Measuring range |
Accuracy |
Resolution |
| O2 |
0 to 25 Vol.% |
±0.2 Vol.% |
0.01 Vol.% |
| CO (H2 compensated) |
0 to 10,000 ppm |
±10 ppm or ±10% of mv
(0 to 200 ppm)
±20 ppm or ±5% of mv
(201 to 2,000 ppm)
±10% of mv (2,001 to 10,000 ppm) |
1 ppm |
| COlow (H2 compensated) |
0 to 500 ppm |
±2 ppm (0 to 39.9 ppm)
±5% of mv (remaining range)* |
0.1 ppm |
| NO |
0 to 3,000 ppm |
±5 ppm (0 to 99 ppm)
±5% of mv (100 to 1,999 ppm)
±10% of mv (2,000 to 3,000 ppm) |
1 ppm |
| NOlow |
0 to 300 ppm |
±2 ppm (0 to 39.9 ppm)
±5% of mv (remaining range) |
0.1 ppm |
| NO2** |
0 to 500 ppm |
±10 ppm (0 to 199 ppm)
±5% of mv (remaining range) |
0.1 ppm |
| SO2** |
0 to 5,000 ppm |
±10 ppm (0 to 99 ppm)
±10% of mv (remaining range) |
1 ppm |
| CO2 calc. |
0 – CO2 max.
0.1 Vol. % |
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Temperature
Probe type K (NiCr-Ni) |
-40 to +2192°F |
0.9°F (32 to 212°F)
±0.5% of rdg. (remaining range) |
0.1°F |
Differential pressure
Absolute pressure |
-80 to 80 "H20
240 to 460 "H20 |
0.2 "H20 (-20 to 20 "H20)
±1.5% of rdg. (remaining range)
4 " H20 |
0.04 "H20
0.4"H20 |
Efficiency
Flue gas loss |
0 to 120%
0 to 99.9% |
calculated
calculated |
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Data Sheet
Instruction Manual