Document ID: chunk:federal_register_of_legislation:F2023L01529:body:0:p36
Version: federal_register_of_legislation:F2023L01529
Segment Type: other
Provision Reference: 
Character Range: 100830–103717

be within ±1.0 K and the temperature shall be capable of being resolved to ±0.1 K.

       4.4.5. The recording or data processing system shall be capable of resolving time to ± 15 seconds.

       4.5. Pressure recording

       4.5.1. The difference p between barometric pressure within the test area and the enclosure internal pressure shall, throughout the hydrogen emission measurements, be recorded at a frequency of at least once per minute.

       4.5.2. The accuracy of the pressure recording system shall be within ±2 hPa and the pressure shall be capable of being resolved to ±0.2 hPa.

       4.5.3. The recording or data processing system shall be capable of resolving time to ±15 seconds.

       4.6. Voltage and current intensity recording

       4.6.1. The charger voltage and current intensity (battery) shall, throughout the hydrogen emission measurements, be recorded at a frequency of at least once per minute.

       4.6.2. The accuracy of the voltage recording system shall be within ±1 V and the voltage shall be capable of being resolved to ±0.1 V.

       4.6.3. The accuracy of the current intensity recording system shall be within ±0.5 A and the current intensity shall be capable of being resolved to ±0.05 A.

       4.6.4. The recording or data processing system shall be capable of resolving time to ±15 seconds.

       4.7. Fans

        The chamber shall be equipped with one or more fans or blowers with a possible flow of 0.1 to 0.5 m3/second in order to thoroughly mix the atmosphere in the enclosure.  It shall be possible to reach a homogeneous temperature and hydrogen concentration in the chamber during measurements.  The vehicle in the enclosure shall not be subjected to a direct stream of air from the fans or blowers.

       4.8. Gases

       4.8.1. The following pure gases shall be available for calibration and operation:

           (a) Purified synthetic air (purity < 1 ppm C1 equivalent; < 1 ppm CO; < 400 ppm CO2; < 0.1 ppm NO ); oxygen content between 18 and 21 per cent by volume,

       (b) Hydrogen ( H2 ), 99.5 per cent minimum purity.

       4.8.2. Calibration and span gases shall contain mixtures of hydrogen (H2) and purified synthetic air.  The real concentrations of a calibration gas shall be within ±2 per cent of the nominal values.  The accuracy of the diluted gases obtained when using a gas divider shall be within ±2 per cent of the nominal value.  The concentrations specified in Appendix 1 may also be obtained by a gas divider using synthetic air as the dilution gas.

       5. Test procedure

        The test consists in the five following steps:

       (a) vehicle/REESS preparation;

       (b) discharge of theREESS;

       (c) determination of hydrogen emissions during a normal charge;

       (d) discharge of the traction battery;

           (e) determination of hydrogen emissions during