Division 3.5 Measurement equipment specifications
United Kingdom
The measurement equipment shall meet the requirements of paragraph 9 of Annex 4 to UN/ECE Regulation 49 Rev.06.
Notwithstanding the requirements defined in paragraph 9 of Annex 4 to UN/ECE Regulation 49 Rev.06, the measurement systems listed in Table 2 shall meet the limits defined in Table 2.
Table 2
Requirements of measurement systems
| ‘Accuracy’ means the deviation of the analyzer reading from a reference value which is traceable to a national or international standard. | ||||||
| ‘Rise time’ means the difference in time between the 10 percent and 90 percent response of the final analyzer reading (t90 – t10). | ||||||
| The ‘max calibration’ values shall be 1,1 times the maximum predicted value expected during all testruns for the respective measurement system. | ||||||
| Linearity | ||||||
|---|---|---|---|---|---|---|
| Measurement system | Intercept| xmin × (a1 – 1) + a0 | | Slopea1 | Standard error of estimate SEE | Coefficient of determinationr2 | Accuracyf1 | Rise timef2 |
| Engine speed | ≤ 0,2 % max calibrationf3 | 0,999 - 1,001 | ≤ 0,1 % max calibration | ≥ 0,9985 | 0,2 % of reading or 0,1 % of max. calibration of speed whichever is larger | ≤ 1 s |
| Engine torque | ≤ 0,5 % max calibration | 0,995 - 1,005 | ≤ 0,5 % max calibration | ≥ 0,995 | 0,6 % of reading or 0,3 % of max. calibration of torque whichever is larger | ≤ 1 s |
| Fuel mass flow for liquid fuels | ≤ 0,5 % max calibration | 0,995 - 1,005 | ≤ 0,5 % max calibration | ≥ 0,995 | 0,6 % of reading or 0,3 % of max. calibration of flow whichever is larger | ≤ 2 s |
| Fuel mass flow for gaseous fuels | ≤ 1 % max calibration | 0,99 - 1,01 | ≤ 1 % max calibration | ≥ 0,995 | 1 % of reading or 0,5 % of max. calibration of flow whichever is larger | ≤ 2 s |
| Electrical Power | ≤ 1 % max calibration | 0,98 - 1,02 | ≤ 2 % max calibration | ≥ 0,990 | n.a. | ≤ 1 s |
| Current | ≤ 1 % max calibration | 0,98 - 1,02 | ≤ 2 % max calibration | ≥ 0,990 | n.a. | ≤ 1 s |
| Voltage | ≤ 1 % max calibration | 0,98 - 1,02 | ≤ 2 % max calibration | ≥ 0,990 | n.a. | ≤ 1 s |
‘xmin’, used for calculation of the intercept value in Table 2, shall be 0,9 times the minimum predicted value expected during all testruns for the respective measurement system.
The signal delivery rate of the measurement systems listed in Table 2, except for the fuel mass flow measurement system, shall be at least 5 Hz (≥ 10 Hz recommended). The signal delivery rate of the fuel mass flow measurement system shall be at least 2 Hz.
All measurement data shall be recorded with a sample rate of at least 5 Hz (≥ 10 Hz recommended).
Annotations
Footnotes
- f1
-
‘Accuracy’ means the deviation of the analyzer reading from a reference value which is traceable to a national or international standard.
- f2
-
‘Rise time’ means the difference in time between the 10 percent and 90 percent response of the final analyzer reading (t90 – t10).
- f3
-
The ‘max calibration’ values shall be 1,1 times the maximum predicted value expected during all testruns for the respective measurement system.