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HJ 377-2019: Technical specifications and test procedures for water quality on-line automatic monitoring equipment of chemical oxygen demand (CODCr)
HJ 377-2019
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing HJ/T 377-2007
Technical specifications and test procedures for water
quality on-line automatic monitoring equipment of
chemical oxygen demand (CODCr)
ISSUED ON: DECEMBER 24, 2019
IMPLEMENTED ON: MARCH 24, 2020
Issued by: Ministry of Ecology and Environment
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Technical requirements ... 8 
5 Performance indicators and test methods ... 12 
6 Operating instructions ... 22 
Technical specifications and test procedures for water
quality on-line automatic monitoring equipment of
chemical oxygen demand (CODCr)
1 Scope
This Standard specifies technical specifications, performance indicators and
test procedures for water quality on-line automatic monitoring equipment of
chemical oxygen demand (CODCr).
This Standard is applicable to guide production design, guide application type
selection and conduction of performance inspection of water quality on-line
automatic monitoring equipment of chemical oxygen demand (CODCr) for
surface water, domestic sewage and industrial wastewater.
The measurement range of water quality on-line automatic monitoring
equipment of chemical oxygen demand (CODCr) shall include
15mg/L~2000mg/L (ρ(Cl-) ≤2000mg/L). It shall be able to meet monitoring
requirements for surface water, domestic sewage and industrial wastewater.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For undated reference
documents, the latest versions apply to this Standard.
GB/T 9969, General Principles for Preparation of Instructions for Use of
Industrial Products
GB/T 13306, Plate
HJ 212, Data transmission standard for online monitoring systems of
pollutant
HJ 828, Water quality - Determination of the chemical oxygen demand -
Dichromate method
HJ/T 70, High-chlorine wastewater - Determination of chemical oxygen
demand - Chlorine emendation method
concentration standard solution that continuously measures the concentration
at the specified period (80%~100%) as the upper limit of test range, the
measured value of instrument and the initial value without unplanned manual
maintenance and calibration of instrument TO the upper limit of test range.
3.9 memory effect
The degree of influence of residues in the instrument pipeline on the next
measurement result after the instrument completes the measurement of a
standard solution or sample.
3.10 interference of voltage
The deviation BETWEEN the measured value of the same standard solution
under different power supply voltages AND the measured value at the standard
power supply voltage (220V).
3.11 interference of chloridion
The deviation BETWEEN the measured value of the standard solution that
contains chloridion AND the measured value of the standard solution that
contains no chloridion.
3.12 interference of environmental temperature
The deviation BETWEEN the measured value of the same standard solution at
different ambient temperatures AND the measured value at 20°C.
3.13 minimum period between maintenance operations
Total operating time (hours) that during the test process, no manual
maintenance of the instrument is required (including replacement of reagents,
calibration of instrument) until the instrument cannot maintain the normal
measurement state or the performance indicators do not meet relevant
requirements.
3.14 data availability
The percentage of actual valid data relative to the total data that shall be
obtained, during the entire instrument test cycle.
3.15 conformity
Parallelism of measured values of multiple instruments under the same test
conditions.
3.16 running record
Referring to working parameters that are automatically recorded by instrument
and reagents.
Digestion unit: use appropriate digestion methods and strong oxidants to
oxidize the organic and inorganic reducing substances in water samples to
corresponding required functional units.
Analysis and test unit: consisting of reaction modules and test modules.
Through the control unit, complete the automatic online analysis on the
substances to be tested and convert the measured value to the part of electrical
signal output.
Control unit: including system control hardware and software, the part to realize
operations such as sample injection, digestion and liquid drainage. It has
functions such as data collection, processing, display storage, security
management, data and operation log query output, as well as output sample
retention and trigger sampling at the same time. When the control unit realizes
the above functions, it shall be able to provide corresponding communication
protocol and the corresponding communication protocol shall meet the
requirements of HJ 212.
4.2 Environmental conditions for use
Ambient temperature: 5°C~40°C;
Relative humidity: 65% ± 20%;
Power supply voltage: AC voltage 220V ± 22V;
Power frequency: 50Hz ± 0.5Hz;
Water sample temperature: 0°C~50°C.
4.3 Appearance requirements
4.3.1 The instrument marks shall meet the requirements specified in GB/T
13306. The signs shall be fixed in appropriate places. On the fixed signs, the
following information shall be contained:
a) Power category;
b) Manufacturer name and address;
c) Instrument name, model;
d) Exit-factory No.;
e) Date of manufacture;
f) Scope of measuring range;
4.4.5.9 The unit of instrument measurement result is mg/L. Keep one digit after
decimal point.
4.4.5.10 There shall be digital communication interfaces. Through digital
communication interfaces, it outputs instruction, related data and running
record. It shall be able to receive remote control instructions from management
platform, at least containing remote start, remote time synchronization functions.
4.4.5.11 The data transmission shall provide communication protocol and meet
the requirements of HJ 212.
4.4.5.12 It shall realize the serial output and network output of monitoring data.
4.4.5.13 It shall have abnormal information recording, uploading and feedback
functions, at least including: reagent shortage alarm, component failure alarm,
liquid leakage alarm, sampling failure alarm and over-standard alarm.
4.4.5.14 It shall have the function that when the power is accidentally cut off
and re-energized, the water samples and reagents being measured before the
power off can be automatically discharged, the channels can be automatically
cleaned, and the test can be automatically reset to restart the test. If it is in the
state of heating and digestion before power off, it shall automatically cool down
after it is powered on again and automatically reset to the state to restart the
test. All system setting data, including calibration data, alarm data and operating
data, shall not change when the power is reconnected within 30d of power
failure.
4.4.5.15 It shall have three levels of operation management authority. Level one
is query authority, which can only query parameters and data. Level two is
management authority, which can perform maintenance and repair operations
such as calibration, cleaning, and instrument parameter setting. Level three is
developer authority, which can modify the instrument kernel.
4.4.5.16 It shall have the function to collect, store the waste liquid of analysis
and the cleaning wastewater. Process according to the management
requirements.
5 Performance indicators and test methods
5.1 Performance indicators
Within the basic test range of which the concentration value of chemical oxygen
demand (CODCr) is 15mg/L~200mg/L, conduct the test according to the method
specified in 5.5 of this Standard. The performances of water quality on-line
automatic monitoring equipment of chemical oxygen demand (CODCr) must
meet the requirements of Table 1.
5.3 Reagents
5.3.1 Experimental water: distilled water without reducing substances that is
obtained according to the method of HJ 828.
5.3.2 Chemical oxygen demand (CODCr) standard stock solution: ρ =
2000.0mg/L.
Weigh 1.7004g of potassium hydrogen phthalate (KHC8H4O4, premium grade)
that is dried at 120°C for 2h and cooled to constant weight. Dissolve in an
appropriate amount of water. Move into a 1000mL volumetric flask. Dilute to the
scale. This solution is stored at 2°C~5°C. It can be stored stably for one month.
Other low-density chemical oxygen demand (CODCr) standard solutions are
obtained from the chemical oxygen demand (CODCr) standard stock solution
after stepwise dilution.
5.3.3 Sodium chloride (NaCl), analytical reagent.
Place sodium chloride in a porcelain crucible. Burn 40min~50min at
500°C~600°C. Cool in a dryer for use.
5.4 Test preparation and calibration
5.4.1 Check each part of the instrument. Adjust the instrument to normal
working state.
5.4.2 Check each reagent of the instrument. Ensure it sufficient and meet
quality requirements.
5.4.3 After connecting the power supply, perform warm-up operation according
to the warm-up time specified in the operating instructions provided by the
instrument manufacturer, so as to stabilize the function of each part.
5.4.4 According to the calibration method specified in the operating instructions
provided by the instrument manufacturer, use chemical oxygen demand (CODCr)
standard stock solution (5.3.2) to prepare the standard solution of the
concentration specified by the instrument to calibrate.
5.5 Test methods of basic test range
5.5.1 Indication error
During normal instrument operation, respectively measure three standard
solutions of which the chemical oxygen demand (CODCr) concentration values
are approximately 40mg/L, 100mg/L, 160mg/L. Continuously measure n (n=6)
times for each solution, the relative error of the average value of measured
values of n (n=6) times TO mass concentration value of standard solution.
value ( ) of absolute value of absolute error of water sample. See formula (12)
for the calculation method.
Where,
- Average of absolute value of relative error of water sample, %;
- Average of absolute value of absolute error of water sample, mg/L;
Xi - The ith measured value of test water sample of the water quality on-line
automatic monitoring equipment of chemical oxygen demand (CODCr), mg/L;
- Average value of test water sample according to manual method, mg/L;
n - Number of measurements of water sample of the water quality on-line
automatic monitoring equipment of chemical oxygen demand (CODCr);
i - The ith measurement water sample of the water quality on-line automatic
monitoring equipment of chemical oxygen demand (CODCr).
5.5.11 Minimum maintenance cycle
During the entire instrument test cycle, the interval between any two
maintenances of the instrument (including dumping of waste liquid, adding
reagents, changing the measuring range and other maintenance) shall be
≥168h.
5.5.12 Data availability
During the entire instrument test cycle, the available data are:
a) When the instrument is testing the items specified in this Standard
(excluding interference of environmental temperature), the displayed
value of the operating measurement meets the requirements of the
indicators (excluding the data availability indicator) in Table 1 of this
Standard;
b) When the instrument is not testing the items not specified in this Standard,
the instrument shall determine a specific concentration of standard
HJ 377-2019
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing HJ/T 377-2007
Technical specifications and test procedures for water
quality on-line automatic monitoring equipment of
chemical oxygen demand (CODCr)
ISSUED ON: DECEMBER 24, 2019
IMPLEMENTED ON: MARCH 24, 2020
Issued by: Ministry of Ecology and Environment
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Technical requirements ... 8 
5 Performance indicators and test methods ... 12 
6 Operating instructions ... 22 
Technical specifications and test procedures for water
quality on-line automatic monitoring equipment of
chemical oxygen demand (CODCr)
1 Scope
This Standard specifies technical specifications, performance indicators and
test procedures for water quality on-line automatic monitoring equipment of
chemical oxygen demand (CODCr).
This Standard is applicable to guide production design, guide application type
selection and conduction of performance inspection of water quality on-line
automatic monitoring equipment of chemical oxygen demand (CODCr) for
surface water, domestic sewage and industrial wastewater.
The measurement range of water quality on-line automatic monitoring
equipment of chemical oxygen demand (CODCr) shall include
15mg/L~2000mg/L (ρ(Cl-) ≤2000mg/L). It shall be able to meet monitoring
requirements for surface water, domestic sewage and industrial wastewater.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For undated reference
documents, the latest versions apply to this Standard.
GB/T 9969, General Principles for Preparation of Instructions for Use of
Industrial Products
GB/T 13306, Plate
HJ 212, Data transmission standard for online monitoring systems of
pollutant
HJ 828, Water quality - Determination of the chemical oxygen demand -
Dichromate method
HJ/T 70, High-chlorine wastewater - Determination of chemical oxygen
demand - Chlorine emendation method
concentration standard solution that continuously measures the concentration
at the specified period (80%~100%) as the upper limit of test range, the
measured value of instrument and the initial value without unplanned manual
maintenance and calibra...