Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p15
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 15/150)
Character Range: 756005–758966

and flows have reached their operating set points.
              A.1.2.5.2. Cleaning the sampling system
              To prevent system contamination, the sampling lines of the PEMS instruments shall be purged until sampling begins, according to the instrument manufacturer specifications.
A.1.2.5.3. Checking and calibrating the analysers
The zero and span calibration and the linearity checks of the analysers shall be performed using calibration gases meeting the requirements of paragraph 9.3.3. of Annex 4 to this Regulation. A linearity check shall have been performed within three months before the actual test.
              A.1.2.5.4. Cleaning the EFM
              The EFM shall be purged at the pressure transducer connections in accordance with the instrument manufacturer specifications. This procedure shall remove condensation and diesel particulate matter from the pressure lines and the associated flow tube pressure measurement ports.
              A.1.2.6. Emissions test run
              A.1.2.6.1. Test start
              For the purposes of the test procedure, "test start" shall mean the first ignition of the internal combustion engine.

              Emissions sampling, measurement of the exhaust parameters and recording of the engine and ambient data shall commence prior to the test start. Artificial warming up of the emission control systems of the vehicle prior to the test start shall be prohibited.

              At test start, the temperature of the coolant shall not exceed the ambient temperature by more than 5 °C, and shall not exceed 303 K (30 °C). The data evaluation shall start once the coolant temperature has reached 303 K (30 °C) for the first time or once the coolant temperature is stabilised within +/– 2 K over a period of 5 minutes, whichever occurs first, but in any event no later than 10 minutes after test start."

A.1.2.6.2. Test run
Emission sampling, measurement of the exhaust parameters and recording of the engine and ambient data shall continue throughout the normal in-use operation of the engine. The engine may be stopped and started, but emissions sampling shall continue throughout the entire test.
Periodic zero-checks of the PEMS gas analysers may be conducted every two hours and the results may be used to perform a zero drift correction. The data recorded during the checks shall be flagged and shall not be used for the emission calculations.
              In case of interrupted GPS signal the GPS data may be calculated based on the ECU vehicle speed and a map, for a consecutive period of less than 60 s. If the cumulative loss of GPS signal exceeds 3 per cent of the total trip duration, the trip should be declared void.
       A.1.2.6.3. Test end

              Test end is reached when the vehicle has completed the trip and the internal combustion engine is switched off.

              The internal combustion engine shall be switched off as soon as practicable at the end of