1 Application scope
This standard specifies the technical specifications, performance indexes and test procedures for ultrasonic open channel sewage flowmeter.
This standard is applicable to the production design, application selection and performance test of ultrasonic open channel sewage flowmeter.
This standard is applicable to the ultrasonic open channel sewage flowmeter (hereinafter referred to as "the flowmeter") for flow rate measurement using weirs and flumes for flow measurement complying with the requirements in JJG 711.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For undated references, the valid edition applies.
GB 3836.1 Explosive atmospheres — Part 1: Equipment — General requirements
GB/T 13306 Plates
GB/T 17214.1 Industrial-process measurement and control equipment — Operating conditions — Part 1: Climatic conditions
JJG 711 Verification Regulation of Weirs and Flumes for Flow Measurement
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
ultrasonic open channel sewage flowmeter
instrument that measures the liquid level at the designated position of the weirs and flumes in open channel (excluding the weirs and flumes) by ultrasonic principle and calculates the flow rate according to the standard equation
3.2
weirs and flumes for flow measurement
device for flowmeter measurement, which consists of upstream and downstream proximal sections, weir bodies and stage observation facilities
3.3
flow rate
liquid volume passing through a cross-section of flow in an open channel per unit of time
3.4
stage
elevation value obtained calculated from the elevation of the measuring reference point (or zero point) plus the distance of a certain liquid level.
3.5
error of liquid level
deviation between the liquid level measured by flowmeter and the measured value of a standard ruler
3.6
flow rate error
deviation between the flow rate measured by flowmeter and the theoretical flow rate
3.7
voltage adaptability
deviation between the measured value and the reference value of the liquid level measured by the instrument at the same height under different voltages
Foreword i
1 Application scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Requirements for performance indexes
6 Testing of performance indexes
7 Random data
1 Application scope
This standard specifies the technical specifications, performance indexes and test procedures for ultrasonic open channel sewage flowmeter.
This standard is applicable to the production design, application selection and performance test of ultrasonic open channel sewage flowmeter.
This standard is applicable to the ultrasonic open channel sewage flowmeter (hereinafter referred to as "the flowmeter") for flow rate measurement using weirs and flumes for flow measurement complying with the requirements in JJG 711.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For undated references, the valid edition applies.
GB 3836.1 Explosive atmospheres — Part 1: Equipment — General requirements
GB/T 13306 Plates
GB/T 17214.1 Industrial-process measurement and control equipment — Operating conditions — Part 1: Climatic conditions
JJG 711 Verification Regulation of Weirs and Flumes for Flow Measurement
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
ultrasonic open channel sewage flowmeter
instrument that measures the liquid level at the designated position of the weirs and flumes in open channel (excluding the weirs and flumes) by ultrasonic principle and calculates the flow rate according to the standard equation
3.2
weirs and flumes for flow measurement
device for flowmeter measurement, which consists of upstream and downstream proximal sections, weir bodies and stage observation facilities
3.3
flow rate
liquid volume passing through a cross-section of flow in an open channel per unit of time
3.4
stage
elevation value obtained calculated from the elevation of the measuring reference point (or zero point) plus the distance of a certain liquid level.
3.5
error of liquid level
deviation between the liquid level measured by flowmeter and the measured value of a standard ruler
3.6
flow rate error
deviation between the flow rate measured by flowmeter and the theoretical flow rate
3.7
voltage adaptability
deviation between the measured value and the reference value of the liquid level measured by the instrument at the same height under different voltages
Contents of HJ 15-2019
Foreword i
1 Application scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Requirements for performance indexes
6 Testing of performance indexes
7 Random data
