HJ/T 104-2003 PDF in English
HJ/T 104-2003 (HJ/T104-2003, HJT 104-2003, HJT104-2003)
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The technical requirement for water quality automatic analyzer of total organic carbon
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Standards related to (historical): HJ/T 104-2003
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HJ/T 104-2003: PDF in English (HJT 104-2003) HJ/T 104-2003
HJ
NATIONAL ENVIRONMENTAL PROTECTION INDUSTRY
STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA
The technical requirement for water quality
automatic analyzer of total organic carbon
ISSUED ON. MARCH 28, 2003
IMPLEMENTED ON. JULY 1, 2003
Issued by. General Administration of State Environmental Protection
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Principles ... 5
5 Range of determination ... 6
6 Working voltage and frequency ... 6
7 Performance requirements ... 6
8 Instrument construction ... 7
9 Inspection methods ... 10
10 Identification ... 12
11 Operating manual ... 13
12 Verification ... 14
The technical requirement for water quality
automatic analyzer of total organic carbon
1 Scope
This Technical Requirement specifies the technical performance requirements
and performance test methods for water quality automatic analyzer of total
organic carbon (TOC) in surface water, industrial sewage, and municipal
sewage, is applicable to the development, production, and performance
inspection of such instruments.
2 Normative references
The clauses in the following documents, by reference in this Standard,
constitute the clauses of this Standard. For the dated references, the
subsequent amendments (not including errata content) or revisions do not
apply to this Standard. However, parties which have reached an agreement
according to this Standard are encouraged to study whether the latest version
of these documents can be used. For the undated references, the latest version
is applicable to this Standard.
GB 13193-91 Water quality - Determination of TOC by nondispersive infrared
absorption method
3 Terms and definitions
The following terms and definitions are applicable to this Standard.
3.1 Sample
The surface water, industrial sewage, and municipal sewage introduced into the
automatic analyzer.
3.2 Calibration solution
Calibration solution prepared to obtain the same indicated value as the sample
TOC concentration. There are the following types.
3.2.1 Zero calibration solution.
and automatically reset to the state where the measurement is restarted.
7.4 When the sample or reagent cannot be introduced into the reactor, the
system can alarm through the buzzer and display the failure content. At the
same time, STOP running until the system is restarted.
8 Instrument construction
8.1 General construction. The following requirements must be met.
8.1.1 The structure is reasonable. The surface and decoration of chassis casing
are free from cracks, deformation, scratches, dirt, burrs, etc.. The surface
coating is uniform, without corrosion, rust, falling off, and wear. The product
assembly is sturdy. The parts are tightened without looseness. The buttons,
switch door locks, etc. are matched with appropriateness, and the control is
flexible and reliable.
8.1.2 Under normal operating conditions, it can work smoothly without safety
hazards.
8.1.3 Each component is less prone to mechanical and circuit failures. There is
no safety hazard in construction.
8.1.4 It shall have the performance of not affecting the operation of automatic
analyzer due to water soaking, condensation, etc..
8.1.5 The heat-bonding part of a burner, etc. shall have the performance of not
being deformed and changed in function due to heating.
8.1.6 It shall be easy for maintenance and check operations, without safety
hazards.
8.1.7 The display is free from smudging and damage. The character strokes of
the display part are uniform in brightness and clear; and there are no black-
corner, black spots, rainbows, bubbles, dark display, hidden stroke, no display,
blinking, etc..
8.1.8 The characters, symbols, and signs which indicate functions shall comply
with the provisions of “10 Identification” of this Standard.
8.2 Construction. The automatic analyzer of TOC shall consist of a sample
introduction unit, an inorganic carbon removal unit, a reactor unit, a detection
unit, and units for display recording, data processing, and signal transmission.
8.3 Sample introduction unit. It refers to a connection part which sends the
sample to the reaction detection unit through the sample conduit of sample
of the sample after removal of inorganic carbon is first metered and sent to the
oxidation reactor with a carrier gas. For example, a slide valve with a metering
tube can be used.
8.5.2.2 When injecting the sample using the continuous type, the sample after
removal of inorganic carbon is sent to the oxidation reactor at a certain flow rate.
For example, a metering pump can be used.
Note. In order to perform only the performance check of reaction detection unit, any of the
above injection modes shall have a construction in which zero calibration solution, span
calibration solution, etc. can be introduced by this unit.
8.5.3 Oxidation reactor - It is classified into dry and wet types.
8.5.3.1 Dry oxidation reactor. The combustion tube filled with catalysts such as
platinum-based, alumina-based, or cobalt-based catalysts is kept at 680 ~
1000°C and burns the TOC in the sample introduced by the carrier gas. Dry
oxidation reactors are commonly used in two ways. One is to continuously pass
the carrier gas into the combustion tube. The other is to close the combustion
tube for a certain period of time, and in the state where the carrier gas is stopped
being passed into, the TOC in the sample is burned and oxidized.
8.5.3.2 Wet oxidation reactor. The TOC is oxidized by applying external energy
such as adding an oxidizing agent such as potassium persulfate to the sample
and using ultraviolet irradiation.
8.5.4 Gas-liquid separator. It refers to the device for cooling the gas sent from
oxidation reactor to remove moisture from the gas. It consists of a cooler, a
condenser, and a drain trap.
8.5.5 Detector. such as nondispersive infrared gas analyzer, etc..
8.6 Display recording unit. It has the function of recording the TOC value in the
display form of equal division.
8.7 Data transmission device. It has a complete data acquisition and
transmission system.
8.8 Attachments. The automatic analyzer of TOC can be configured with the
following attachments as needed.
8.8.1 Data processing device. It expresses the TOC value in digital form and
has data processing functions such as printing and calculation.
8.8.2 Automatic calibrator. It has the function of automatically performing the
zero and span calibration of the analyzer in a certain period.
to the preheating time specified in the operating manual, the preheating
operation of automatic analyzer is performed, so that the functions of each part
and the display recording unit are stabilized.
9.3.2 Calibration. According to the calibration method of instrument manual,
USE 9.2.2 and 9.2.3 calibration solutions for instrument zero calibration and
span calibration.
9.4 Performance test methods
9.4.1 Repeatability error. Under the test conditions of 9.1, the zero calibration
solution is measured 6 times; and the average of the indicated values is taken
as the zero value. Under the same conditions, the span calibration solution is
measured 6 times; and the relative standard deviation of the 6 span measured
values is calculated.
9.4.2 Zero drift. USE zero calibration solution for continuous measurement for
24 h. USE the initial zero value (the average of the first three measured values)
during this period of time to calculate the percentage of the maximum amplitude
of variation relative to the span value.
9.4.3 Span drift. In zero drift test, before and after the zero drift test, span
calibration solution is used instead of zero calibration solution and is measured
3 times respectively. The average is calculated. The percentage relative to the
span value is calculated from the amplitude of variation of initial span value after
subtracting the zero-drift component.
9.4.4 Linearity. After the analyzer is calibrated for zero and span, the span
intermediate calibration solution is introduced. After the indicated value is stable,
the span intermediate value is read. The percentage OF the difference between
the TOC concentration corresponding to the span intermediate value and the
TOC concentration of the span intermediate calibration solution relative TO the
span value is calculated.
9.4.5 Response time. The zero calibration solution is introduced from the
sample inlet. After the indicated value is stabilized, the span calibration solution
is introduced. The time (min) required from the introduction of span calibration
solution to reaching 90% of the final indicated value of the span calibration
solution is calculated.
9.4.6 Mean time between failures. Real water sample is used for continuous
operation for 2 months. The total running time (h) and the number of failures
(times) are recorded. CALCULATE whether the mean time between failures
(MTBF) is ≥720 h/time (This index can be evaluated on site).
9.4.7 Real water sample comparison test. SELECT 5 or more kinds of real water
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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