GB/T 778.3-2018Meters for cold potable water and hot water -- Part 3: Test report format (English PDF)

4.1 General

Each check and test should be filled out with a checklist, examples are as follows.

x Qualified

x failed

n/an/a not applicable

4.2 Information about the type

4.2.1 General

Application Number.

Applicant.

Authorized representative.

address.

Laboratory.

Authorized representative.

address.

4.2.2 Submitted prototype

New prototype.

The difference from the approved prototype.

approval number.

The difference from the approved prototype.

See Table 1.

Table 1 submitted prototype

Submit an approval test is a no a note

Mechanical water meter (integral)

Mechanical water meter (separate type)

Electronic water meter (integral)

Electronic water meter (separate type)

Water meter series

Separable calculator (including pointing device)

Separable measurement sensor (including flow or volume sensing element)

Additional electronics for testing (permanently connected to water meters)

Additional electronics for data transmission (permanently connected to water meters)

Additional electronics for testing (temporarily connected to the water meter)

Additional electronics for data transmission (temporarily connected to the water meter)

assisting equipments

a Tick the appropriate box.

4.2.3 Mechanical water meter (integral or split)

manufacturer.

model.

Type parameters.

Q1 m3/h

Q2 m3/h

Q3 m3/h

Q4 m3/h

Q3/Q1

Composite water meter

Qx1 m3/h

Qx2 m3/h

Measuring principle.

level of accuracy.

Temperature rating.

Environmental rating.

Electromagnetic environment.

Maximum allowable temperature. °C

Maximum allowable pressure. MPa ( bar)

Bearing limit.

EUT test requirements (8.1.8 of GB/T 778.2-2018).

Product Categories.

Test classification.

Installation details.

Connection form (flange, thread, coaxial manifold).

Inlet minimum straight length. mm

Minimum straight pipe length at exit. mm

Flow straightener (details when needed).

installation.

Direction.

Other relevant information.

Note. If you submit a water meter series, the content of this clause is required for each specification of the series.

4.2.4 Electronic water meter (integral or split)

manufacturer.

model.

Type parameters.

Q1 m3/h

Q2 m3/h

Q3 m3/h

Q4 m3/h

Q3/Q1

Composite water meter

Qx1 m3/h

Qx2 m3/h

Measuring principle.

level of accuracy.

Temperature rating.

Environmental rating.

Electromagnetic environment.

Maximum allowable temperature. °C

Maximum allowable pressure. MPa ( bar)

Bearing limit.

EUT test requirements (8.1.8 of GB/T 778.2-2018).

Product Categories.

Test classification.

Installation details (mechanical).

Connection form (flange, thread, coaxial manifold).

Inlet minimum straight length. mm

Minimum straight pipe length at exit. mm

Flow straightener (details when needed).

installation.

Direction.

Other relevant information.

Installation details (electrical).

Wiring instructions.

Installation layout.

Bearing limit.

power supply.

Type (battery, AC, DC).

Umax. V

Umin. V

Frequency. Hz

Note. If you submit a water meter series, each specification provides the content of these terms.

4.2.5 Separable calculator (including pointing device)

manufacturer.

model.

Type parameters.

Q1 m3/h

Q2 m3/h

Q3 m3/h

Q4 m3/h

Q3/Q1

Composite water meter

Qx1 m3/h

Qx2 m3/h

Measuring principle.

level of accuracy.

Temperature rating.

Environmental rating.

Electromagnetic environment.

Maximum allowable temperature. °C

Maximum allowable pressure. MPa ( bar)

Bearing limit.

EUT test requirements (8.1.8 of GB/T 778.2-2018).

Product Categories.

Test classification.

The maximum relative error given by the manufacturer.

Low zone Q1<=Q \u003cQ2.

High area Q2<=Q<=Q4.

Installation details (electrical).

Wiring instructions.

Installation layout.

Bearing limit.

power supply.

Type (battery, AC, DC).

Umax. V

Umin. V

Frequency. Hz

Compatible with measurement sensors (including flow or volume sensing components) approval number.

4.2.6 Separable measuring sensors (including flow or volume sensing elements)

manufacturer.

model.

Type parameters.

Q1 m3/h

Q2 m3/h

Q3 m3/h

Q4 m3/h

Q3/Q1

Composite water meter

Qx1 m3/h

Qx2 m3/h

Measuring principle.

level of accuracy.

Temperature rating.

Environmental rating.

Electromagnetic environment.

Maximum allowable temperature. °C

Maximum allowable pressure. MPa ( bar)

Bearing limit.

EUT test requirements (8.1.8 of GB/T 778.2-2018).

Product Categories.

Test classification.

The maximum relative error given by the manufacturer.

Low zone Q1<=Q \u003cQ2.

High area Q2<=Q<=Q4.

Installation details (mechanical).

Connection form (flange, thread, coaxial manifold).

Inlet minimum straight length. mm

Minimum straight pipe length at exit. mm

Flow regulator (details when needed).

installation.

Direction.

Other relevant information.

Installation details (electrical).

Wiring instructions.

Installation layout.

Bearing limit.

power supply.

Type (battery, AC, DC).

Umax. V

Umin. V

Frequency. Hz

Compatible with measurement sensors (including flow or volume sensing components) approval number.

4.2.7 Additional electronic devices for testing (permanently connected to water meters)

manufacturer.

model.

power supply.

Type (battery, AC, DC).

Umax. V

Umin. V

Frequency. Hz

Installation details (electrical).

Wiring instructions.

Installation layout.

Bearing limit.

4.2.8 Additional electronic devices for data transmission (permanently connected to water meters)

manufacturer.

model.

power supply.

Type (battery, AC, DC).

Umax. V

Umin. V

Frequency. Hz

Installation details (electrical).

Wiring instructions.

Installation layout.

Bearing limit.

4.2.9 Additional electronic device for testing (temporarily connected to the water meter)

manufacturer.

model.

power supply.

Type (battery, AC, DC).

Umax. V

Umin. V

Frequency. Hz

Installation details (electrical).

Wiring instructions.

Installation layout.

Bearing limit.

4.2.10 Additional electronic device for data transmission (temporary connection to water meter)

manufacturer.

model.

power supply.

Type (battery, AC, DC).

Umax. V

Umin. V

Frequency. Hz

EUT test requirements (8.1.8 of GB/T 778.2-2018).

Product Categories.

Test classification.

Installation details (electrical).

Wiring instructions.

Installation layout.

Bearing limit.

4.2.11 Auxiliary device

manufacturer.

model.

power supply.

Type (battery, AC, DC).

Umax. V

Umin. V

Frequency. Hz

Compatible calculator (including pointing device) approval number.

EUT test requirements (8.1.8 of GB/T 778.2-2018).

Product Categories.

Test classification.

Installation details (electrical).

Wiring instructions.

Installation layout.

Bearing limit.

Compatible with water meter, calculator (including indicator device) and measurement sensor (including flow or volume detection component) approval number.

4.2.12 Type approval related documents

See Appendix A for a list of relevant documents submitted with the same type approval application.

4.3 Basic information of the test equipment

Details of all measuring and test instruments used in type checking and initial testing should be listed in the table in Appendix B, including

Includes the following.

---manufacturer;

---model;

---Numbering;

---The date of the most recent calibration;

--- The next calibration date of the measuring instrument, etc., including.

* Linear size measuring instrument;

* pressure gauge;

* pressure transmitter;

* pressure gauge;

* temperature sensor;

* standard table;

* volume box;

* Weighing instrument;

* Signal generator (pulse, current, voltage).

4.4 Water meter inspection and performance test checklist

4.4.1 Water meter checklist

Visual inspection of all water meters

GB/T 778.1-2018

Article number

Request - Remarks

Indicator device function

6.7.1.1 The indicating device shall provide an easy-to-read, reliable and intuitive indication volume indication

6.7.1.1 The indicating device shall contain observation tools for testing and calibration

6.7.1.1

The indicator device can be attached with some components for testing and calibration by other methods.

Precise, such as automatic testing and calibration

Unit of measurement and its location

6.7.1.2 The unit of indication of water volume shall be cubic meters

6.7.1.2 The symbol m3 shall be indicated on the dial or in the immediate vicinity of the display number

Indication range

6.7.1.3 Q3<=6.3, the minimum indication range is 0m3~9999m3

Indicator color sign

6.7.1.4 cubic meters and their multiples are represented by black

6.7.1.4 The approximate number of cubic meters is represented by red

6.7.1.4

This should be used for pointers, indicators, numbers, character wheels, dials, dials or aperture frames.

Two colors

6.7.1.4

As long as the main indication and the alternate display can be clearly distinguished (for example for verification and testing)

Approximate number), other methods can also be used to display cubic meters, multiples of cubic meters and

Approximation

Type of indicating device. Class 1 - Simulator

6.7.2.1

The volume is indicated by the continuous motion of the following components.

a) one or more pointers move relative to each indexing scale;

b) one or more dials or drums each pass an indicator

6.7.2.1

The cubic value represented by each division should be expressed in the form of 10n, where n is a positive integer.

Number, negative integer or zero, thus establishing a continuous decimal system

6.7.2.1

Each scale shall be indexed in cubic meters or with a multiplier (x0.001;

x0.01; x0.1; x1; x10; x100; x1000, etc.)

6.7.2.1 Rotating moving hands or dials should move clockwise

6.7.2.1 The pointer or scale moving in a straight line should move from left to right

6.7.2.1 The digital wheel indicator (drum) should be turned upwards

Indication device type. Category 2 - Digital device

6.7.2.2 The volume is indicated by a number adjacent to one of the one or more openings

(continued)

Visual inspection of all water meters

GB/T 778.1-2018

Article number

Request - Remarks

Indication device type. Category 2 - Digital device

6.7.2.2

The carry of any given number should change from 9 to 0 in the adjacent low digits.

Time to complete

6.7.2.2 The appearance height of the number shall not be less than 4mm

6.7.2.2 For non-electronic devices, the digital wheel indicator (drum) should move up

6.7.2.2

For non-electronic devices, the ten digits of the lowest position value can be continuously moved, opening

Be large enough to accurately read the numbers

6.7.2.2 For electronic devices that are not permanently displayed, the indication value shall be displayed for at least 10s or more.

6.7.2.2

For electronic devices, the water meter should be visually inspected according to the following steps.

--- All display fields of the seven-segment display are lit (ie "day" type test

test);

--- All display fields of the seven-segment display are all off (ie "full blank" test

test).

For graphic displays, the corresponding test should prove that the display failure will not cause

Misunderstanding of any number.

Each step lasts at least 1 second

Type of indicating device. Class 3---analog and digital combined indicating device

6.7.2.3

The volume is indicated by the combination of the first type of device and the second type of device, and the two types of devices should be respectively

Meet their respective requirements

Verification device - general requirements

6.7.3.1

Each indicator device should have an intuitive, unambiguous verification test and calibration

s method

6.7.3.1 Visual inspection shows continuous or intermittent motion

6.7.3.1

In addition to the visual verification display, the pointing device can be attached via an additional component (eg star

Wheel or disc), providing signals for external testing by externally attached sensing elements

Verification device---visual verification display

6.7.3.2.1

The scale value of the calibration scale is expressed in cubic meters and is expressed as follows. 1 x 10n,

6.7.3.2.1 The indicated volume is represented by a row of numbers within one or more openings

6.7.3.2.1

For analog and digital indicating devices for continuous motion of the first unit,

The interval between two adjacent numbers of one unit is divided into 2, 5 or 10 equal parts, which constitutes

Verification scale. These scales should not be marked with numbers

6.7.3.2.1

For the digital indicating device that the first unit is not continuously moving, the first unit is two

The interval of adjacent numbers or the incremental motion of the first unit as the calibration scale

6.7.3.2.2

On the indicating device for continuous movement of the first unit, the apparent scale spacing should be not less than

1mm, no more than 5mm

6.7.3.2.2

The scale should consist of one of the following forms.

a) Lines of equal width but different length, the width of the line does not exceed the scale

One quarter of the distance;

b) a constant width contrast stripe with a width equal to the scale spacing

(continued)

Visual inspection of all water meters

GB/T 778.1-2018

Article number

Request - Remarks

Verification device---visual verification display

6.7.3.2.2

The width of the tip of the pointer should not exceed a quarter of the scale spacing, and

Under no circumstances should it be greater than 0.5mm

Indicating device resolution

6.7.3.2.3

The subdivision of the calibration scale should be small enough to ensure the resolution error of the pointing device

Does not exceed 0.25% of the volume within 90 minutes of Q1 flow (level 1 accuracy)

Grade water meter) and 0.5% (Level 2 accuracy grade water meter).

Note 1. When the first unit is continuously displayed, the maximum reading per reading is allowed to be no more than

One-half the error of the division interval.

Note 2. When the first unit is displayed intermittently, the maximum reading per reading is allowed to be no more than

The error of a number that verifies the scale.

Note. For dual water meters with two indicating devices, the above requirements apply to both indicating devices.

Mark and nameplate

6.6.1

A position setting check mark should be left on the water meter. The verification mark should be set in the clear, no

Need to be disassembled to see

6.6.2

The following information should be clearly and permanently marked on the water meter. This information can be centralized or

The scatter mark is on the outer casing of the water meter, the dial of the indicating device, the nameplate or the inseparable

On the cover of the water meter, these signs should be sold or used without the need to disassemble the water meter.

can see

6.6.2a) Unit of measurement. cubic meters

6.6.2b) Accuracy level (non-level 2)

6.6.2c)

The value of Q3 and the ratio of Q3/Q1 (may be prefixed with R). If the water meter can measure the reverse flow,

And the ratio of the Q3 value of the two flow directions and the ratio of Q3/Q1 are different, then the values of the two flow directions

All should be marked; the flow direction corresponding to each pair of values should be clearly indicated. If the water meter is hanging

If the Q3/Q1 values are different between the straight and horizontal positions, both values should be marked and should be

Indicate the corresponding location

6.6.2d) Type approval mark in accordance with national regulations

6.6.2e) Manufacturer's name or trademark

6.6.2f) Year of manufacture (last two digits of the year of manufacture, or year of manufacture)

6.6.2g) Number (as close as possible to the pointing device)

6.6.2h)

Flow direction (marked on both sides of the water meter housing, if under any circumstances can be very

Easy to see the flow direction indicator arrow, or just mark it on one side)

6.6.2i)

More than 1 MPa (10 bar), or, for DN >= 500 mm, more than 0.6

The maximum allowable pressure at MPa (6 bar).

(Unit bar can only be used when allowed by national regulations)

6.6.2j) The water meter can only be marked with the letter V or H when working in a vertical or horizontal position

6.6.2k) Temperature class, except T30

(continued)

Visual inspection of all water meters

GB/T 778.1-2018

Article number

Request - Remarks

Mark and nameplate

6.6.2l) Pressure loss level, except deltap63

6.6.2m) Sensitivity level, except U0/D0

Additional sign with electronic water meter

6.6.2n) External power supply. voltage and frequency

6.6.2o) Replaceable battery. deadline for battery replacement

6.6.2p) Non-replaceable battery. deadline for replacing the water meter

6.6.2q) Environmental rating

6.6.2r) Electromagnetic environment level

defensive equipment

6.8.1

The water meter should be equipped with a protective device that can be sealed to ensure that the water meter is properly installed.

And after installation, the water meter and/or the water meter and/or cannot be removed without damaging the guard

Water meter adjustment device or correction device. Both tables of the duplex water meter shall comply with

This requirement

Protective device---electronic seal device

6.8.2.1

When a mechanical seal does not prevent access to parameters that affect the measurement results,

The following protective measures should be taken.

a) Only allow authorization by means of passwords (keywords) or special devices (eg keys)

Personnel access. The password should be replaceable.

b) Intervention evidence should be retained in accordance with the time limits set by national regulations. Record should be included

Include date and identify the characteristics of the authorized personnel who perform the intervention [see a)]. in case

Previous records must be deleted to record new interventions and the oldest records should be deleted

6.8.2.2

Water meters fitted with user disconnectable and interchangeable parts shall comply with the following regulations.

a) If it does not meet the requirements of 6.8.2.1 of GB/T 778.1-2018, it shall not be

The parameters that participate in determining the measurement result can be accessed through the disconnection point.

b) should be prevented by means of electronic and data processing security mechanisms or mechanical devices

Enter any device that may affect accuracy

6.8.2.3

Water meters fitted with non-interchangeable parts that can be disconnected by the user shall comply with

The provisions of 6.8.2.2 of GB/T 778.1-2018.

In addition, such water meters should be equipped with a device when the various components are not in the approved type.

The water meter can be prevented from working when connected.

Note. This type of water meter can be equipped with a device that can be disconnected and reconnected when the user arbitrarily disconnects

After that, the water meter can be prevented from working.

Inspection and testing of inspection equipment

General inspection requirements for inspection equipment

5.1.3

In addition to the fixed supply and demand sides, and can not be zero measurement, with electronic devices

The water meter shall be equipped with the inspection device specified in Appendix B.

(continued)

Visual inspection of all water meters

GB/T 778.1-2018

Article number

Request - Remarks

General inspection requirements for inspection equipment

5.1.3

All water meters equipped with inspection devices shall be as in 4.2.7 of GB/T 778.1-2018

Said to prevent or detect countercurrent

4.4.2 Water meter performance test checklist

4.4.2.1 Performance test of all water meters

GB/T 778.1-2018

Article number

Request - Remarks

Static pressure test

4.2.10

The water meter shall withstand the following test pressures without damage and leakage.

a) 1.6 times the maximum allowable pressure, 15min;

b) 2 times the maximum allowable pressure, 1min

Basic indication error

7.2.3

The indication error of the water meter (measuring the actual volume) should be at least in the following flow range

determine.

---Q1~1.1Q1;

---Q2~1.1Q2;

---0.33(Q2 Q3)~0.37(Q2 Q3);

---0.67(Q2 Q3)~0.74(Q2 Q3);

---0.9Q3~Q3;

---0.95Q4~Q4

For duplex water meters.

---0.85Qx1~0.95Qx1;

---1.05Qx2~1.15Qx2

There should be no temporary attachments to the water meter during the test.

During the test, other influence factors should be maintained in the reference conditions.

Depending on the shape of the error curve, it is also possible to test at other flow rates.

1) The (indicative) error observed at all the above flow points should not exceed

The maximum allowable error specified in 4.2.2 or 4.2.3 of GB/T 778.1-...