DGUV 79 / BGV D34 - Accident prevention regulation "Use of liquid gas" (EXTRACT)
§37 Vehicles with liquid gas combustion engine (excerpt)
The employer shall ensure that the pollutant concentration in the exhaust gas is checked periodically, but at least every six months, by an authorised technician and that it is adjusted to the lowest achievable value.
Implementation Instructions for § 37 Para. 2
The lowest achievable value can be assumed if the CO content does not exceed 0.1 Vol.% at idling speed with the engine at operating temperature.
An inspection certificate, which must be completed, signed and handed over to the user by the authorized technician, serves as proof that the exhaust gas measurement has been carried out.