Ammonia nitrogen water quality online monitoring instrument

1、 Equipment Overview

Ammonia nitrogen water quality online monitoring instrumentThe Chemical Oxygen Demand Online Analyzer is a core online analysis equipment in the field of water quality monitoring, used for real-time, continuous, and automatic detection of the concentration value of Chemical Oxygen Demand (COD) in water bodies, reflecting the pollution level of reducing organic and inorganic substances in water bodies. It is a core monitoring indicator equipment for determining water pollution levels and meeting water discharge standards. This equipment is an industrial grade fully automatic monitoring device that can achieve unmanned operation of the entire process of water sample automatic sampling, automatic preprocessing, automatic digestion, automatic detection, automatic calculation, data uploading, and over limit alarm. It can output COD concentration data 24 hours a day without interruption; Supporting integration with environmental data acquisition instruments, PLC/DCS control systems, and online monitoring platforms, data can be uploaded in real-time to various levels of environmental supervision systems, meeting multiple needs for environmental compliance acceptance, total pollutant discharge control, process optimization, and water quality safety warning. The equipment is adaptable to various water conditions and widely used in scenarios such as municipal sewage, industrial wastewater, surface water, drinking water sources, and sewage outlets. It is the core equipment of the online water quality monitoring system.

IIAmmonia nitrogen water quality online monitoring instrumentCore product features

Industrial grade stable design, suitable for complex water sample working conditions: The whole machine adopts an anti-corrosion, moisture-proof, and dust-proof industrial grade chassis, and the core flow path adopts acid and alkali resistant and corrosion-resistant imported pipelines (PTFE/fluororubber), which can withstand industrial wastewater with high turbidity, high chromaticity, high salinity, and high chloride ions, without pipeline blockage, corrosion and aging problems, and is suitable for long-term uninterrupted operation of outdoor station buildings/indoor cabinets.

Fully automatic unmanned operation, low maintenance cost: built-in self-priming sampling pump, automatically completes the entire process of water sample collection, filtration, digestion, detection, and cleaning, without the need for manual sampling and testing; Support automatic calibration, automatic quality control, and automatic emptying of waste liquid. Regular replenishment of reagents and replacement of consumables are required, significantly reducing manual operation and maintenance workload.

National standard testing, precise data: The mainstream models adopt the testing methods specified by national environmental protection standards, with accurate and repeatable test results. The data has legal effect and can be directly used for environmental acceptance and pollution declaration, effectively avoiding data traceability risks.

Strong anti-interference ability and reliable detection results: In response to interference factors such as high chloride ions, high suspended solids, and high chromaticity in industrial wastewater, standard features include chloride ion masking, water sample pretreatment and filtration, and turbidity compensation, which can effectively eliminate interference and ensure detection accuracy under different water quality conditions without false data bias.

Multi functional integration, full process data traceability: equipped with high-definition LCD touch screen, local real-time display of COD concentration value, historical data curve, operating status, reagent remaining amount, fault alarm and other information; Support local storage of historical monitoring data for ≥ 1 year, data can be exported from a USB flash drive and accessed remotely, with the characteristics of data loss during power outages and traceable.

*Signal output and linkage alarm: Standard 4-20mA analog signal+RS485 (Modbus RTU) digital signal, seamlessly compatible with data acquisition instruments, industrial computers, and environmental platforms; Equipped with two-level over limit alarm (low alarm/high alarm), supporting sound and light alarm, SMS alarm, remote platform alarm. Some models have relay switch output, which can be linked with water treatment equipment such as dosing pumps and valves to achieve automatic linkage disposal of over limit.

Multi range flexible adaptation, strong scalability: built-in multi range automatic switching function, can automatically match the detection range according to the COD concentration of water samples, taking into account the detection needs of low concentration surface water (0-50mg/L) and high concentration industrial wastewater (0-5000mg/L); Some models can expand ammonia nitrogen, total phosphorus, and total nitrogen pH、 Turbidity and other multiple water quality indicators, one machine can be used for multiple purposes.

Intelligent fault diagnosis, convenient operation and maintenance: It has full fault self checking functions such as reagent shortage alarm, pipeline blockage alarm, digestion fault alarm, calibration failure alarm, etc. The fault information is displayed and uploaded in real time, which can quickly locate the problem without the need for professional personnel to troubleshoot, reducing the threshold for operation and maintenance.

3、 General core technical parameters

Monitoring indicator: Chemical Oxygen Demand (COD ₍ Cr ₎)

Detection range: Standard range: 0~100mg/L, 0~500mg/L, 0~1000mg/L, 0~2000mg/L, 0~5000mg/L (multi range automatic switching, customizable high range of 0~10000mg/L)

Detection accuracy: ≤± 5% indication error (national standard first level accuracy); ≤± 8% indication error (conventional model)

Repetitive error: ≤± 3%

Low detection limit: 0.5 mg/L

Digestion conditions: Potassium dichromate method, 165 ℃ constant temperature digestion, digestion time of 15 minutes (according to national standards)

Anti chloride ion interference: standard tolerance ≤ 20000mg/L Cl ⁻ (with masking agent), customized version can tolerate ≤ 50000mg/L Cl ⁻

Zero drift/range drift: ≤± 3% FS/24h

Sampling method: self-priming sampling, sampling head 0-5m, adjustable sampling flow rate

Output signal: Standard 4-20mA analog signal+RS485 (Modbus RTU) digital signal; Optional GPRS/4G/NB IoT wireless transmission (directly connected to environmental protection platform), relay switch quantity (alarm linkage)

Alarm function: two-level over limit alarm (low alarm/high alarm), customizable threshold, supports local sound and light alarm+remote platform alarm

Data storage: Local storage of ≥ 1 year of historical data, supports exporting Excel format reports from USB flash drives, and visualizes data curves

Calibration methods: automatic zero calibration, automatic range calibration, manual calibration, supporting standard sample calibration, blank calibration

Working environment: Temperature range of 5 ℃ to 40 ℃; Humidity 10%~95% RH without condensation (outdoor station buildings come standard with constant temperature air conditioning)

Protection level: host IP54, sampling unit IP65

Power supply mode: AC220V ± 10% 50Hz

Core functions: automatic sampling, automatic filtering, automatic digestion, automatic detection, automatic cleaning, automatic emptying, reagent remaining alarm, fault self check, data upload

5、 Overall composition of the equipment

Real time online monitoring of COD, ammonia nitrogen water quality

As a complete integrated system, it is not a single host. According to the on-site water sample conditions, it is divided into basic models (standard) and high-end models (including pre-treatment). All constituent units work together to ensure equipment stability and accurate detection. It is a standard configuration for industrial sites:

1. Core analysis host

The core unit includes water sample injection module, digestion reaction module, spectral detection module, control display module, data processing module, and output communication module, which are the core components for COD detection and data output.

2. Water sample pretreatment unit (standard, core important)

Industrial water samples contain suspended solids, sediment, oil stains, and other impurities. The pre-treatment unit is the key to ensuring the normal operation of the equipment. Standard equipment includes a water sample filter (precision filter element), sedimentation tank, oil remover, and constant pressure and flow device. Its function is to filter solid impurities in the water sample, remove oil stains, stabilize the water sample flow rate, prevent pipeline blockage and pollution of the detection tank, and ensure detection accuracy.

3. Sampling unit

It includes a sampling pump, sampling pipeline, sampling probe, and ball valve, which can automatically collect water samples from pools, channels, and sewage outlets. The sampling depth and head can be selected according to needs.

4. Reagent storage and dosing unit

Exclusive unit for potassium dichromate/potassium permanganate method, including reagent bottle, quantitative dosing pump, waste liquid collection bottle, automatic quantitative addition of digestion solution, catalyst, masking agent, unified collection of waste liquid, and environmentally friendly treatment.

5. Optional auxiliary unit

Constant temperature and pressure device: suitable for outdoor high and low temperature environments, ensuring stable digestion temperature;

Sample retention device: automatic retention of water samples exceeding the standard, convenient for manual retesting;

Backblowing cleaning device: Regularly clean the pipeline and filter element to prevent blockage;

Data acquisition instrument: a dedicated data transmission device that interfaces with environmental protection platforms, with standard upload function.

6、 Main application areas

Municipal sewage treatment industry: COD online monitoring of the inlet, biochemical tank, and outlet of municipal sewage treatment plants, real-time reflection of sewage treatment efficiency, and ensuring that the effluent meets the discharge standards.

Industrial wastewater monitoring: COD monitoring of production wastewater, process wastewater, workshop sewage outlets, and enterprise total discharge outlets in industries such as chemical, printing and dyeing, papermaking, electroplating, pharmaceuticals, food processing, metallurgy, coking, slaughtering, brewing, etc., to meet the requirements of environmental pollution permits and total quantity control.

Industrial park water quality monitoring: Industrial park sewage centralized treatment plant, park sewage outlet, and COD online monitoring of pipeline nodes, real-time monitoring of the overall sewage discharge situation in the park, to prevent enterprises from secretly discharging and leaking.

Surface water/drinking water monitoring: COD monitoring of rivers, lakes, reservoirs, drinking water sources, and groundwater to assess water environmental quality and warn of water pollution accidents.

Environmental supervision and monitoring: COD online monitoring of national/provincial/municipal controlled sewage outlets, cross-border sections, and polluted rivers to achieve real-time monitoring of water quality data and trace pollution sources.

Aquaculture/Landscape Water Monitoring: COD monitoring of aquaculture ponds, landscape lakes, and artificial wetlands to ensure the safety of water ecological environment and prevent eutrophication of water bodies.

7、 Daily maintenance and precautions (core focus, affecting equipment lifespan and data accuracy)

The difficulty of operation and maintenance is low. Daily maintenance mainly involves replacing consumables, supplementing reagents, and regular calibration. Standardized maintenance can significantly extend equipment life and ensure accurate detection data. The core maintenance points are as follows:

Reagent replenishment and replacement: The potassium dichromate method requires regular replenishment of digestion solution, silver sulfate, and mercury sulfate reagents, usually every 1-3 months. Reagent expiration can lead to a decrease in detection accuracy; Waste liquid needs to be collected and handed over to professional institutions for treatment. Direct discharge is strictly prohibited.

Filter element/filter maintenance: The filter element and filter screen of the pretreatment unit need to be cleaned or replaced regularly (usually 1-2 weeks). For high turbidity water samples, it is recommended to shorten it to 3-7 days to prevent impurities from blocking the pipeline and affecting sampling and detection.

Regular calibration: It is recommended to perform zero calibration once a month and range calibration every three months (using standard COD standard solution); Calibration must be completed before environmental acceptance to ensure accurate and compliant data.

Pipeline cleaning: The equipment comes with an automatic cleaning function, and it is recommended to automatically clean 1-2 times a day; If the water sample contains oil stains and viscous impurities, it is necessary to manually clean the pipeline and detection tank regularly to prevent scaling and pollution.

Pre treatment requirements for water samples: It is strictly prohibited for untreated high turbidity, high oil pollution, and high sediment water samples to directly enter the analysis host, which may cause pipeline blockage, detection tank pollution, and direct damage to core components.

Environmental adaptation: The equipment host should be installed in a ventilated, dry, and dark station building. Outdoor installation should be equipped with a constant temperature and humidity station building to avoid direct sunlight and high temperature and humidity environments that may cause instrument failure.

Winter antifreeze: In the northern winter, it is necessary to perform heat tracing and insulation treatment on the sampling pipeline and pretreatment unit to prevent water samples from freezing and blocking the pipeline, which may damage the equipment.