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HJ 915-2017: Technical specifications for automatic monitoring of surface water (Trial)
HJ 915-2017
HJ
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Technical specifications for automatic
monitoring of surface water (Trial)
ISSUED ON. DECEMBER 28, 2017
IMPLEMENTED ON. APRIL 01, 2018
Issued by. Ministry of Environmental Protection of the PRC
Table of Contents
Foreword ... 3 
1 Scope of application ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Construction of automatic water quality monitoring system ... 5 
5 Acceptance of automatic water quality monitoring system ... 8 
6 Operational maintenance of automatic water quality monitoring system ... 10 
7 Quality assurance and quality control ... 15 
8 Frequency of data acquisition and effectiveness judgment ... 19 
9 Establishment of safeguard system ... 20 
Appendix A (Normative) Selection of automatic water quality monitoring item
and requirements for instrument performance ... 21 
Appendix B (Informative) Technical requirements for construction of automatic
water quality monitoring system ... 24 
Appendix C (Informative) Technical requirements for acceptance of automatic
water quality monitoring system ... 36 
Foreword
This standard is formulated for the purpose of implementing the Environmental
Protection Law of the People's Republic of China and the Law of the People's
Republic of China on the Prevention and Control of Water Pollution, protecting
the environment, safeguarding human health, strengthening environmental
management, standardizing the automatic water quality monitoring system.
This standard specifies the technical requirements for the construction,
acceptance, operation and management of the automatic water quality
monitoring system.
Appendix A of this standard is a normative appendix; Appendix B and Appendix
C are informative appendixes.
This standard is the first release.
This standard was formulated under the organization of the Environmental
Monitoring Department and the Science and Technology Standards Department
of the Ministry of Environmental Protection.
Drafting organizations of this standard. China Environmental Monitoring Center,
Jiangsu Environmental Monitoring Center, Liaoning Provincial Environmental
Monitoring Experimental Center, Henan Environmental Monitoring Center, Wuxi
Environmental Monitoring Center Station.
This standard was approved by the Ministry of Environmental Protection on
December 28, 2017.
This standard shall be implemented from April 1, 2018.
For this standard, the Ministry of Environmental Protection is responsible for its
interpretation.
Technical specifications for automatic
monitoring of surface water (Trial)
1 Scope of application
This standard specifies the technical requirements for the construction,
acceptance, operation and management of the automatic water quality
monitoring system (except seawater).
This standard applies to the automatic water quality monitoring system which
is constructed by the environmental protection department.
2 Normative references
The contents of this standard refer to the terms in the following documents. For
undated references, the valid version applies to this standard.
GB 3838 Environmental quality standards for surface water
HJ/T 96 The technical requirement for water quality automatic analyzer of
PH
HJ/T 97 The technical requirement for water quality automatic analyzer of
electroconductivity
HJ/T 98 The technical requirement for water quality automatic analyzer of
turbidity
HJ/T 99 The technical requirement for water quality automatic analyzer of
dissolved oxygen
HJ/T 100 The technical requirement for water quality automatic analyzer of
permanganate index
HJ/T 101 The technical requirement for water quality automatic analyzer of
ammonia
HJ/T 102 The technical requirement for water quality automatic analyzer of
total nitrogen
HJ/T 103 The technical requirement for water quality automatic analyzer of
total phosphorous
HJ/T 104 The technical requirement for water quality automatic analyzer of
total organic carbon
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Automatic water quality monitoring
The entire process of automatic collection, processing, analysis and data
transmission of surface water samples.
3.2
Automatic water quality monitoring station
Refers to the on-site part of the automatic water quality monitoring, generally
consisting of all or some of units such as station or house, water collection
and distribution, control, detection, data transmission, etc., abbreviated as
water station.
3.3
Automatic water quality monitoring center
A system for remote monitoring, data transmission statistics and application
of water stations, abbreviated as data platform.
3.4
Automatic water quality monitoring system
An automatic monitoring system consisting of a water station and a data
platform.
3.5
Conventional five parameters
Five conventional items in the monitoring of surface water quality. water
temperature, pH, dissolved oxygen, conductivity and turbidity.
4 Construction of automatic water quality monitoring
system
4.1 General requirements
The construction of automatic water quality monitoring system mainly includes.
the construction of selection of site, construction of station building, water
station units and data platform. Among them, the instrument’s performance
indicators shall meet the requirements of Appendix A.2, the construction of
system refers to the requirements of Appendix B.
4.2 Selection of site
The principles for site selection include feasibility of station construction,
representation of water quality, long-term monitoring, system safety and
operational economy.
In order to ensure the long-term stable operation of the automatic water quality
monitoring system, the selected site shall have good traffic, electricity, clean
water, communication, distance of water collection point, water collection head,
feasibility of water collection in dry season, operation and maintenance safety,
and other basic conditions for the construction of station building.
The monitoring results of the selected sites can represent the water quality
status and changing trends of the monitored water bodies. The river monitoring
section is generally selected in a straight river section where the water quality
is uniformly distributed and the flow rate is relatively stable, more than 1 km
away from the upstream estuary or sewage outlet. In principle, it is consistent
with or similar to the original conventional monitoring section, to ensure
continuity of the monitoring data. The lake reservoir section shall have a good
hydraulic exchange, the location can fully reflect the true state of the water
quality of the lake reservoir in the monitored area, avoid setting it in the
backwater zone, the stagnant water zone, or the place where sedimentation
and watergrass growth are likely to occur.
4.3 Construction of station building
For the construction of the station building, according to the actual situation of
the site environment, construction period, installation conditions of monitoring
instrument and equipment, and so on of the station site, it adopts the fixed station,
simple station, small station, water fixed platform station, water buoy (ship)
station, etc., for system construction. The design and construction of the station
building is combined...