GB/T 9081-2023Fuel dispensers for motor vehicles (English PDF)

3.1 Fuel dispenser

A liquid volume measuring system used to refuel vehicles, which may have additional devices and ancillary devices.

3.2 Flow measurement transducer

A component that converts the measured continuous flow of liquid fuel into mechanical rotation and transmits it to the coding device.

3.3 Coding device

A component that converts the mechanical rotation of the flow measurement transducer into a digital signal and transmits it to the measurement controlling board.

3.4 Measurement controlling board

A component, which receives the digital signal transmitted by the coding device, generates refueling data according to the legal measurement control requirements, transmits it to the indicating device for display through the monitoring microprocessor. It has data communication, processing, storage, control and other related functions.

3.5 Indicating device

A component that can continuously display refueling data.

3.6 Security checking device

A device used to ensure the correct generation, complete recording, reliable storage, safe transmission of refueling data, etc., and to verify key electronic components of the fuel dispenser.

4.1 Structure and appearance

The structure and appearance of the fuel dispenser shall meet the following requirements. […]

4.2 Explosion-proof performance

The explosion-proof structure and performance of the complete fuel dispenser shall comply with the requirements of GB/T 3836.1, GB/T 3836.2, GB/T 3836.3, GB/T 3836.4, GB/T 3836.9, GB/T 3836.15, GB/T 3836.28, GB/T 3836.29, GB/T 22380.1,

GB/T 22380.2 (when equipped with pull-off valve), GB 50058, GB 50156; it shall also obtain the explosion-proof certificate and inspection report.

4.3 Metrology performance

4.3.1 Flow range

The ratio of the maximum flow rate Qmax and the minimum flow rate Qmin marked on the nameplate of the fuel dispenser shall not be less than 10.1.

4.3.2 Minimum measured quantity

The minimum measurand quantity shall meet the following requirements. […]

4.3.6 Flow interruption indication error

If the oil circuit is suddenly closed during the refueling process, the volume indication error and payment amount indication error shall meet the requirements of 4.3.4 and 4.3.5, respectively.

4.3.7 Counting indication range

The range of counting indications shall meet the requirements of measurement accuracy. The requirements for the indication range are as follows. […]

4.3.8 Measuring endurance

After the fuel dispenser operates for 100 hours at 80% to 100% of the maximum flow rate as shown on the nameplate, the average value of the indication error and measurement repeatability of each measurement point shall meet the requirements of […]

4.4 Electronic system security

4.4.1 General requirements

4.4.2 Self-locking function

4.4.2.1 The fuel dispenser shall be able to activate the self-locking function through special equipment.

4.4.2.2 When the authentication between the monitoring microprocessor, coding device, and indicating device fails or the operation is abnormal, the dispenser can be automatically locked.

4.4.2.3 When the monitoring microprocessor and security checking device fail in validation, the fuel dispenser can be automatically locked.

4.4.3 Validation function

4.4.3.1 The key electronic components of the fuel dispenser shall have the function of being registered in the online validation system.

4.4.3.2 The complete fuel dispenser shall have the function of registering in the online validation system and starting calibration.

4.5 Air-liquid ratio performance

4.5.1 When the refueling volume is not less than 15 L, the air-liquid ratio of vapor recovery shall meet the requirements of 5.3 in GB 20952-2020.

4.5.2 The vapor recovery system should have an air-liquid ratio detection function, to realize closed-loop control and automatically adjust the air-liquid ratio, to meet the requirements of 5.3 in GB 20952-2020.

4.6 Climate and environmental adaptability

Under the following environmental conditions, the fuel dispenser shall perform normally and meet the requirements of 4.3.4.

4.7 Power supply adaptability

The fuel dispenser shall perform normally in a power supply environment, which has a nominal voltage (allowed fluctuation range is -15% ~ +10%) and maximum frequency variation of ±1 Hz (except DC power supply), meanwhile meet the requirements of 4.3.4.

4.8 Electrical safety

4.9 Adaptability to electromagnetic environment

4.9.1 General requirements

The entire fuel dispenser shall be tested for electrostatic discharge immunity, radio frequency electromagnetic field radiation immunity, electrical fast transient pulse group immunity, voltage sag, short interruption and voltage change immunity, surge (shock) immunity test. During the above test process and after the test is completed, the function of the fuel dispenser shall be normal; the following phenomena shall not occur.

4.9.2 Electrostatic discharge immunity

The electrostatic discharge immunity's severity level shall reach the Level 3 test level specified in GB/T 17626.2-2018.

5.1 Flow measurement transducer

5.1.1 The appearance shall be subject to good surface treatment; it shall be free of visible burrs, scratches, cracks, rust or mildew and other defects.

5.1.2 A flow direction mark shall be marked on an obvious part of the shell.

5.1.6 No leakage when withstanding oil pressure 1.5 times the pump outlet pressure.

5.1.7 A mechanical adjustment device can be equipped to adjust the flow meter so that the indication error is close to zero. The adjustment device and the shell shall have a reliable sealing mechanism, to prevent components from being adjusted or replaced at will.

5.1.8 For discontinuous manual adjustment devices, the adjustment range of the indication error shall be <= 0.05%/grid.

5.2 Coding device

5.2.1 The coding device shall use a special customized chip; the sensor and microprocessor shall be integrated and packaged together. It shall have a unique serial number and cannot be changed; the output signal shall be an encrypted digital signal and shall not be output in plain text or pulse output. The encryption algorithm shall meet the requirements of 4.4.1.6.

5.4 Indicating devices

5.4.1 The indicating device shall use a special customized encrypted display chip with a unique serial number that cannot be changed.

5.5 Security checking device

5.5.1 The security checking device shall have a unique serial number which cannot be changed.

5.5.2 The security checking device shall have an automatic time calibration function and synchronize the time to the monitoring microprocessor.

5.6 Pump (excluding submersible pump)

5.6.1 The flow range shall meet the requirements of 4.3.1.

5.6.2 The absolute value of vacuum at the pump inlet shall be >= 54 kPa; the outlet pressure shall be <= 300 kPa.

5.6.3 There will be no leakage when withstanding a pressure 1.5 times the pump outlet pressure.

5.8 Oil hose

6.1 Test conditions

6.1.1 General

The fuel dispenser shall undergo various tests after the components are assembled. See Appendix C for the test record format.

6.1.2 Ambient temperature

The ambient temperature shall be within -25 °C ~ +55 °C. The temperature change during the test shall not exceed 5 °C. It shall be measured near the oil dispenser and standard metal measuring instrument.

6.3 Explosion-proof performance inspection

The explosion-proof performance inspection of the fuel dispenser shall be carried out in accordance with the following requirements. […]

6.4 Running performance test

The running performance test shall be carried out according to the following provisions.

6.5 Metering performance test

6.5.3 Minimum measurand quantity test

The test shall be carried out in accordance with the provisions of the indication error test for minimum measured quantity in JJF 1521.

6.5.4 Flow interruption indication error test

The test is carried out according to the provisions of the flow interruption indication error test in JJF 1521.

6.11 Electromagnetic environment adaptability test

6.11.1 Electrostatic discharge immunity test

Carry out the test, according to the provisions of electrostatic discharge immunity test in JJF 1521.

6.11.2 Radio frequency electromagnetic field radiation immunity test

The test is carried out according to the provisions of radio frequency electromagnetic field radiation immunity test in JJF 1521.

6.13 Noise detection

The entire fuel dispenser shall be inspected for noise. Proceed as follows. […]

6.14 Gas separation capability test

The test is carried out according to the provisions of gas separation test in JJF 1521.

6.15 Hoses inner volume change test

The test shall be carried out according to the provisions of the hose inner volume test in JJF 1521.

7.1 Inspection types

The inspection of the fuel dispenser is divided into type inspection and exit-factory inspection.

7.2 Inspection items

The items of type inspection and exit-factory inspection of the fuel dispenser are carried out according to Table 2.

7.3 Type inspection

The fuel dispenser and its main components shall undergo type inspection when any of the following conditions apply.

7.4 Exit-factory inspection

7.4.1 Exit-factory inspection shall be carried out on a unit-by-unit basis.

7.4.2 Exit-factory products shall be accompanied by product certificates and instructions for use, as well as certain accessories and wearing spare parts.

7.5 Determination rules

8.1 Sign

8.1.1 The nameplate of the fuel dispenser and each explosion-proof electrical component shall be fixed in a conspicuous position; the writing on the nameplate shall be clear and unmistakable.

8.1.2 The following content shall be indicated on the nameplate of the fuel dispenser.

8.1.3 The contents and markings on the nameplate of explosion-proof electrical equipment shall comply with the provisions of GB/T 3836.1.

8.2 Seal

Fuel dispensers that have passed the exit-factory inspection shall be sealed at the following locations.

8.3 Accompanying documents

A fuel dispenser that has passed the exit-factory inspection shall be accompanied by instructions, packing list, certificate of conformity and other accompanying documents. Electronic instructions are available.

9.1 Packaging

9.1.1 The packaging of the fuel dispenser shall be rainproof; damage to the fuel dispenser shall be avoided during transportation, in accordance with national railway and road transportation provisions.

During transport and lifting, the inclination of the packaging box shall not exceed 30°.

9.3 Storage

Packaged or unpackaged fuel dispensers shall be placed in a dry, ventilated, covered place. The storage location of the dispenser shall be free of harmful gases that corrode metal. […]