721N VIS Spectrophotometer
721N VIS Spectrophotometer has the holographic blazed grating monochromator has the advantages of high wavelength accuracy, good monochromaticity and low stray light.
● Linear regression method and coefficient method are added to the concentration test method.
● USB interface is added, and large capacity memory can store 30 concentration curves.
● Adopt microcomputer measurement system, with high conversion accuracy of T-A, automatic adjustment of
● 0% T and 100% T, concentration factor setting and concentration direct reading.
● High accuracy, Good Reproducibility and Stability of Measurement Readings.
● Automatic light gate technology, No need blackbody, to protect the photoelectric sensor
Features of 721N VIS Spectrophotometer
- Direct Quantitative Analysis: Supports direct concentration readout, concentration-factor setting, linear regression and coefficient methods.
- 30-Curve Memory & USB: Stores up to 30 concentration curves and includes a USB interface for convenient data handling.
- Automatic T/A & Zero Adjustment: Microcomputer measurement system supports precise T/A conversion and automatic 0%T / 100%T adjustment.
- Flexible Cuvette Compartment: Supports 5–50 mm cuvettes for different sample and measurement requirements.
- Automatic Light Gate Protection: Automatic light-gate technology eliminates the need for a blackbody and helps protect the photoelectric sensor.
Applications of 721N VIS Spectrophotometer
Education & Teaching Laboratories
Widely used in teaching laboratories for demonstrating Beer-Lambert Law, calibration curves, and basic qualitative and quantitative analysis of colored solutions.
Chemical & Industrial Process Control
Measuring absorbance-based color intensity and tracking reaction kinetics in dyes, coatings, inks, and electroplating solutions for routine industrial quality control.
Pharmaceutical & Biotech Quality Control
Used for quantitative analysis of APIs and finished products with visible absorbance, dissolution testing, and optional basic DNA/protein quantification and reaction kinetics monitoring via PC software.
Water & Environmental Analysis
Used for routine colorimetric determination of ammonia nitrogen, total phosphorus, Cr⁶⁺, nitrite, and volatile phenols in environmental water quality monitoring.
Food & Agricultural Quality Control
For colorimetric detection of nitrite, nitrate, phosphate, peroxide value, and pigments in food and agricultural products for quality control compliance.
Measurement Functions
Transmittance (%T)
Direct transmittance measurement from 0.0–100.0%T.
Absorbance (A)
Absorbance measurement range of 0.000–1.999 A for routine quantitative analysis.
Concentration (C)
Direct concentration readout from 0.000–1999 C, with concentration-factor setting.
Concentration Curve Analysis
Supports both linear regression and coefficient methods, with storage for up to 30 concentration curves.
CE Certificate
FAQ
Specifications of 721N VIS Spectrophotometer
| Model | 721N |
| Product name | VIS Spectrophotometer |
| Photometry | Split Beam |
| Monochromator Type | Czerny-Turner |
| Focal Length | 160mm |
| Grating | 1200 lines/mm |
| Detector | Silicon Photocell |
| Spectrum Bandwidth | 2nm |
| Wavelength Setting | Manual Turn Knob |
| Wavelength Range | 340-1100nm |
| Wavelength Accuracy | ±2nm |
| Wavelength Repeatability | ≤1nm |
| Stray Light | ≤0.1%T( at 360nm NaNo2 ) |
| Photometric Range | 0.0-100.0% T0.000-1.999 A0.000-1999 C |
| Photometric Accuracy | ±0.5% T±0.004 Abs (0-0.5A)±0.008 Abs (0.5-1A) |
| Photometric Repeatability | ≤0.2% T0.002 Abs (0-0.5A)0.004 Abs (0.5-1A) |
| Noise | 100%（T）noise≤0.3%(T) ， 0%（T）noise≤0.2%(T) |
| Power | AC220V±22V 50Hz±1Hz, 80W |
| Packaging Size | 580mm X 460mm X 345mm 0.1M3 12.5kg |
Standard Accessories
| Operation manual | 1pc |
| UV WIN8 Spectrum data processing software | 1pc |
| Glass cuvette 10mm | 4pcs |
| Power cable | 1pc |
| Fuse | 2pcs |
| Cuvette holder 10mm | 1pc |
Optional Accessories
| Cuvette holder | 50mm 100mm |
| Cuvette | 20mm 30mm 50mm 100mm |
Why Choose Us?
One-Station Shopping
“Multiple suppliers” have always been an issue in the procurement process. Drawell as a one-stop laboratory equipment and scientific instruments supplier, can perfectly solve this problem.
Customer-centric Services
User Training – Training by Drawell skilled engineers about installation, debug tests, technical services, etc. It can happen in our factory in China, or at the site in the customers’ country.
Online Support
To discuss the problem and get it resolved, online chats, real-time video calls, and remote guidance. For the after-sales stage, our online technical guidance is free and ready forever.
100% Quality Guarantee
1-year free warranty includes repairing damaged parts and replacing selected ones (shipping extra). 5% is charged to extend it before it expires.
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