Test vehicle/engine | Diesel (HDD, LDD), Gasoline, LPG and CNG vehicles, Ethanol, Propane, Butane | ||
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Configuration | Interface unit connected to pitot tube via umbilical cable. Pitot tube can be standard (0 - 230ºC) or high temperature (0 - 900ºC) | ||
Flow Rate Accuracy | Within ±1 % of full scale or ±1.5 % of readings (at flow rate of 20 % of full scale) | ||
Linearity | Either of the following: (a) Within ±2.0% of full scale (b) Intercept: |a0| ≤ 1.0% of full scale Slope: 0.98 ≤ a1 ≤ 1.02 Standard estimated error: SEE ≤ 2.0% of full scale Coefficient of determination: R2 ≥ 0.990 | ||
Response Time | <1ms | ||
Tube Attachments | Pitot tube size should be selected from the following list, according to tailpipe diameter and exhaust flow rate: | ||
Pilot Tube | Tube Diameter | Max Flow | |
A-type | 32.0 mm | 2.0 m3/min | |
B-type | 42.7 mm | 4.5 m3/min | |
C-type | 60.5 mm | 10 m3/min | |
D-type | 76.3 mm | 15 m3/min | |
E-type | 89.1 mm | 20 m3/min | |
F-type | 101.6 mm | 30 m3/min | |
G-type | 127.0 mm | 45 m3/min | |
H-type | 152.4 mm | 65 m3/min | |
Noise | Within 2.0% of full scale (at flow rate of 20% of full scale) | ||
Repeatability | Within ±2.0% of readings (at flow rate of 20% of full scale) | ||
Calibration | Interface calibrated every 12 months. Recommended pitot tube calibration every 12 months |