High-Precision Total Nitrogen Analyzers (TN Testers) & Digestion Equipment

As a trusted B2B analytical laboratory instrument manufacturer, Hangzhou Qiwei Instrument Co., Ltd. produces commercial-grade Total Nitrogen Analyzers (TN Testers) engineered for municipal wastewater treatment plants, industrial effluent compliance, groundwater eutrophication control, and environmental testing laboratories.

Designed based on standard alkaline persulfate digestion UV spectrophotometric methods, our TN analyzers feature high-temperature digestion modules, dual-wavelength UV optical detection (220 nm / 275 nm), and pre-calibrated working curves to ensure reliable total nitrogen determination.

Get Bulk Wholesale Quote Download TN Analyzer Specification

Total Nitrogen Tester
Model: BZD-100
Measuring Range: Low range: 0~25 mg/L, High range: 20~100 mg/L
Power Supply: 220±10V
Resolution: 1mg/L
Benchtop Total Nitrogen Analyzer
Model: TZD-100
Measuring range: Low range: 0~25 mg/L; High range: 20~100 mg/L
Power supply: 220±10V
Resolution: 1 mg/L

Explore Our Total Nitrogen Testing Equipment Series

Versatile total nitrogen analytical solutions designed for certified testing laboratory workflows and field wastewater monitoring.

1. Laboratory Benchtop Total Nitrogen Analyzers

High-accuracy laboratory spectrophotometers featuring dual-wavelength UV optics, direct concentration display in mg/L TN, pre-installed calibration curves, and USB export for GLP compliance.

Measurement Range: 0.00 – 100.0 mg/L TN
Automatic organic matter correction ($A_{220} - 2A_{275}$)
Ideal for municipal utilities & environmental labs

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2. Smart Heating Digestion Reactors (TN / TP / COD)

Essential sample digestion units providing precise PID heating (120°C–125°C for 30 min) with transparent safety shields and digital countdown timers for batch sample digestion.

Pre-programmed TN digestion program (125°C, 30 min)
Multi-well heating blocks (12/16/25 vial capacity)
Over-temperature protective shield and alarm

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3. Multi-Parameter Nutrient Analyzers (TN / TP / COD / NH4)

Integrated multi-channel photometers capable of analyzing Total Nitrogen, Total Phosphorus, COD, and Ammonia Nitrogen in a single compact instrument setup.

All-in-one wastewater compliance parameter testing
Reduces total equipment cost for plant engineers
Customizable testing curves for special industrial samples

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Critical Industrial Applications & Engineering Strengths

Why Total Nitrogen (TN) Monitoring is Vital

Total Nitrogen ($TN$) includes organic nitrogen, ammonia nitrogen, nitrite, and nitrate. Excessive $TN$ leads to severe water body eutrophication and oxygen depletion. Key applications include:

Municipal Wastewater Treatment: Evaluating biological denitrification and carbon dosing process efficiency
Industrial Process Effluent: Fertilizer, chemical, food processing, and textile discharge compliance
Surface & Reservoir Water Monitoring: Environmental surveys tracking agricultural nutrient runoff
Aquaculture & Hatcheries: Tracking recirculating water quality and nitrogenous waste build-up

Qiwei Manufacturing & OEM Advantages

Supporting global laboratory suppliers, environmental engineering contractors, and instrument distributors:

Standard Persulfate Chemistry: High-efficiency conversion of all nitrogen compounds into nitrate ($NO_3^-$)
Stable UV Optical Module: Premium deuterium/halogen or LED UV light source ensures high wavelength precision
OEM & ODM Customization: Logo branding, custom housing colors, and localized language software UI
Internal Links: Combine with our Nephelometers, Free Chlorine Analyzers, Nitrite Testers, and Spectrophotometers for complete water analysis.

Frequently Asked Questions (TN Tester Sourcing Guide)

Q1: What analytical method do Qiwei Total Nitrogen Analyzers use?

Our total nitrogen analyzers utilize the standard Alkaline Persulfate Digestion UV Spectrophotometric Method. Samples are digested at 120°C–125°C to convert all nitrogen compounds into nitrate, followed by dual-wavelength UV absorbance measurement at 220 nm and 275 nm.

Q2: Why is dual-wavelength measurement ($A_{220}$ and $A_{275}$) required for TN testing?

Nitrate ions absorb UV light strongly at 220 nm, but dissolved organic matter also absorbs light at 220 nm and 275 nm. Subtracting twice the absorbance at 275 nm ($A_{220} - 2A_{275}$) cancels out organic background interference for precise nitrate determination.

Q3: Do you support OEM custom branding and wholesale distributor pricing?

Yes, as a factory-direct manufacturer, we offer complete OEM/ODM custom branding, customized UI interfaces, and tiered volume discounts for global laboratory suppliers.

Require Factory Direct Pricing or Custom Total Nitrogen Testing Equipment?

Get in touch with Hangzhou Qiwei Instrument today for technical consultation, digestion options, and competitive distributor pricing within 24 hours.

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Hangzhou Qiwei Instrument Co., Ltd. is one of the most reliable manufacturers and suppliers of tn tester in China, featured by quality products and good service. Please rest assured to buy bulk durable tn tester in stock here from our factory. We also accept customized orders.

Benchtop Total Nitrogen Analyzer, Total Nitrogen Tester