testo 338 density gauge instruction manual
The testo 338 is a hand-held measuring device designed to determine soot concentration (mg/m³), Filter Smoke Number (FSN), and Bosch number for diesel engines. It operates using a filter loading principle where a white LED illuminates filter paper, and an optical sensor measures the reflected light to calculate soot deposition based on the differential pressure and temperature of the sampled gas.
| Measuring principle | Filter loading |
|---|---|
| Measuring range FSN/Bosch | 0 to 2.5 |
| Measuring range Soot concentration | 0 to 70 mg/m3 |
| Resolution Soot concentration | 0.01 mg/m3 |
| Rechargeable battery | Lithium-ion, 2600 mAh / 3.7 V |
| Operating temperature | 5 to 45°C |
| Protection class | IP 40 |
| Weight | 770g (including battery) |
The instrument uses a filter loading principle where a white LED illuminates filter paper and an optical sensor measures reflected light to calculate soot deposition.
It is recommended to have the instrument checked once a year to guarantee measurement accuracy.
The device measures soot concentration in mg/m³, Filter Smoke Number (FSN), and Bosch number.