testo 338 - Smoke tester

Modelo  0632 3381

  • Robuste et maniable

  • Determination of soot concentration (mg/m3) as well as Filter Smoke Number (FSN) or Bosch number

  • Easy one-handed operation

  • Direct analysis and display of measurement values, optional on-site printout of data with Testo fast printer

testo 338 sin Bluetooth (con sonda de muestreo de gases, funda TopSafe, fuente de alimentación, papel filtrante de repuesto y maletín de transporte incluidos)

Descripción del producto

Whether you are a technician servicing diesel engines, or a manufacturer who needs to provide proof of emission values – determining the smoke count is often part of your job. With the smoke tester testo 338, you are ideally equipped for the determination of the degree of blackening in diesel engines. The easy-to-operate, handy measuring instrument records the soot concentration (mg/m3)  and the Filter Smoke Number (FSN) or Bosch number for you.

The smoke tester testo 338: flexibly applicable and suitable for industry

The smoke tester testo 338 provides the advantage that, as a portable instrument, it can be taken with you to the desired application site. Whether the diesel engines to be tested are in industrial plants, ships, shipyards or mines – with the testo 338, your smoke tester is always close at hand in your toolbox. This allows you to dispense with the complicated installation of stationary measurement systems.

Especially before commissioning or after servicing diesel engines, a measurement of the smoke count is recommended. This allows you to determine whether the injection is correctly adjusted or whether there are interior engine problems. However, for proof of emission values, it is also often necessary to determine the degree of blackening – for example in mining or shipping, in order to fulfil special environmental stipulations or for testing diesel particle filters. The manufacturers of diesel engines must also meet the requirements of their customers, and provide proof of this. With the testo 338, the first mobile smoke tester with direct data analysis, you are ideally equipped for these applications.

The tab "Applications" provides more information on the application of the testo 338 in the following areas:

  • Commissioning and servicing diesel/industrial engines
  • Diesel engine manufacturing
  • Shipping companies and dockyards
  • Mining and prospecting
  • Construction machines and land-moving vehicles

Smoke counter with innovative technology and high user-friendliness

Start up, measure, understand – no action is superfluous. This is how easy smoke count measurement can be. And how fast. Because the compact testo 338 frees you from handpumps and complicated comparative tables. As the first portable smoke tester, it automatically displays the degree of blackening without needing to use complex analysis electronics.

Thanks to the easy operation of the testo 338, the measurement of degree of blackening is possible without extensive training. The smoke tester directly shows you optionally either the Filter Smoke Number (FSN) or the Bosch number. The instrument also gives the soot concentration. Apart from this, you can also create a connection via infrared interface to the optionally available Testo fast printer, and print out the measurement data easily on site.

What’s included

Smoke counter testo 338, including gas sampling probe, TopSafe, mains unit and instrument case.


Datos técnicos generales

Clase de protección

IP40 con TopSafe


IRDA / Bluetooth® opcional


200 valor medido

Tipo de batería

Iones de litio


aprox. 4 h de uso continuado

Temperatura de uso

Mediciones individuales hasta +500 ºC

Presión máx PdC

300 mbar*

Volumen de la muestra de medición

0,4 litros (rango: 0 hasta 0,3 FSN); 0,2 litros (rango: 0,2 hasta 2 FSN)

Medición de caudal

Sensor de presión diferencial

Sensor óptico

Opacidad de la carga del filtro

Duración de la medición

< 60 s por ciclo de medición

*a presiones mayores aparece una precisión de medición mayor

Medición del grado de ennegrecimiento Concentración de hollín


0 hasta 70 mg/m³


0,01 mg/m³


< 1,5 mg/m³ (0 hasta 5 mg/m³)

< 1,25 mg/m³ +5 % del v.m. (5 hasta 70 mg/m³)

Medición del grado de ennegrecimiento número FSN/Bosch


< 0,08 FSN *


0 hasta 2,5 *


0,01 *

*a condiciones de referencia de 1000 mbar, +25 °C