320–1000 nm Wavelength Range
4 nm / 2 nm / 1.7 nm Bandwidth
Single-Beam
High-Performance 1200 L/mm Grating
Optional PC Software & Scanning
Availability: In Stock
Visible Spectrophotometer
Description
Product Overview
Visible spectrophotometers are essential analytical devices that test the absorbance and transmittance of visible light (320-1000 nm) through liquid samples. They are widely used for colored substance quantification and colorimetric testing, ideal for routine quality control across multiple industries.
Different from UV-Vis spectrophotometers, visible-only models are a cost-effective choice for labs with no UV wavelength testing requirements. Hawach offers a full lineup of visible spectrophotometers, covering entry-level teaching models, mid-range routine testing equipment, and advanced PC-controlled devices with scanning and kinetic testing functions.
All units adopt professional Czerny-Turner (C-T) monochromators and 1200 lines/mm diffraction gratings, delivering low stray light, high optical resolution and stable photometric linearity. The spacious sample chamber supports cuvettes up to 100 mm pathlength, enabling ultra-low concentration detection for water quality monitoring, sugar refining and semiconductor testing.
Note: Visible spectrophotometers only support visible light sample analysis. For UV-dependent testing (nucleic acids, proteins, UV-active pharmaceutical ingredients), a UV-Vis spectrophotometer is required.
Core Advantages
- High-Stability Optical System: 1200 L/mm precision grating and C-T monochromator with imported tungsten lamps ensure low stray light, high resolution, excellent linearity and long service life.
- Flexible Sample Adaptation: Compatible with 5-100 mm cuvettes. Optional 100 mm long-path holder supports ultra-low concentration detection for trace water pollutants and sugar industry testing.
- Full-Grade Product Line: Covers basic manual models (721 series), automatic mid-range devices (723 series) and high-end HW series with double-beam design, automatic sample holders and professional scanning functions.
- Simple & Efficient Operation: HW touchscreen models support direct concentration reading and custom calibration curves. Automatic wavelength models come with built-in wavelength error correction for accurate, hassle-free testing.
- Powerful PC Analysis Software: 723PC and HW723PC models are equipped with UV-Solution 2.0/3.0 software, supporting spectral scanning, kinetic testing, multi-wavelength analysis and curve fitting, with large-capacity data storage.
- Automatic Timed Calibration (T.A.C.F.): Realizes periodic automatic calibration during long-term operation, effectively maintaining consistent testing stability.
- Industry-Specific Accessories: Custom 100 mm cuvette kits for sugar refining, plus optional printers and RS-232/USB data interfaces for convenient data recording and export.
- Complete Technical Support: Each instrument comes with an official factory calibration certificate, with one-stop method development guidance and professional after-sales technical support available.
Model Selection Guide – Which Visible Spectrophotometer Fits Your Workflow?
Entry-Level (721/722/722S/7230G): Manual wavelength adjustment, suitable for teaching experiments and basic routine QC. 7230G includes a standard dedicated printer for direct data documentation.
Mid-Range Automatic (723/723PC): Automatic wavelength positioning with higher accuracy; 723PC adds PC software, spectral scanning and kinetic testing functions for in-depth method development.
Advanced HW Series (HW723/HW723PC): Color touchscreen, ultra-narrow 1.7 nm bandwidth for higher resolution. HW723PC features a proportional double-beam system and 8-cell automatic sample holder, ideal for high-throughput and regulated laboratory testing.
Model Selection Guide – Which Visible Spectrophotometer Fits Your Workflow?
Entry–Level (721/722/722S/7230G): Manual wavelength adjustment, suitable for teaching experiments and basic routine QC. 7230G includes a standard dedicated printer for direct data documentation.
Mid–Range Automatic (723/723PC): Automatic wavelength positioning with higher accuracy; 723PC adds PC software, spectral scanning and kinetic testing functions for in-depth method development.
Advanced HW Series (HW723/HW723PC): Color touchscreen, ultra-narrow 1.7 nm bandwidth for higher resolution. HW723PC features a proportional double-beam system and 8-cell automatic sample holder, ideal for high-throughput and regulated laboratory testing.
Entry-Level Series (Manual Wavelength | 4 nm Bandwidth)
| Cat# | Model | Wavelength Range | Bandwidth | Wavelength Accuracy | Stray Light | Printer | PC Software | Best For |
| 32091001 | 721 | 340-1000 nm | 4 nm | ±2 nm | ≤0.1%T | Optional | – | Teaching, basic QC |
| 32091002 | 721-100 | 340-1000 nm | 4 nm | ±2 nm | ≤0.1%T | Optional | – | Sugar industry, low-conc water |
| 32091003 | 722 | 330-1000 nm | 4 nm | ±2 nm | ≤0.1%T | Optional | – | Industrial QC, broader range |
| 32091004 | 722S | 325-1000 nm | 4 nm | ±2 nm | ≤0.1%T | Optional | – | Improved stability, lab use |
| 32091005 | 7230G | 320-1000 nm | 4 nm | ±2 nm | ≤0.1%T | Standard | Optional | Higher accuracy, documentation |
Standard accessories (721/722/7230G): 4 × 10 mm glass cuvettes, 10 mm cuvette holder, power cord, dust cover, manual, calibration certificate. 721-100 includes 100 mm glass cuvette and 10 cm holder instead of 10 mm set.
Automatic & HW Series (2 nm / 1.7 nm Bandwidth)
| Cat# | Model | Wavelength Range | Bandwidth | Wavelength Accuracy | Stray Light | Display | Scanning | PC Software | Optical System | Key Feature |
| 32091006 | 723 (Auto) | 320-1000 nm | 2 nm | ±1 nm | ≤0.05%T | LCD | No | Optional | Single-beam | Auto wavelength, ±1 nm accuracy |
| 32091007 | 723PC | 320-1000 nm | 2 nm | ±1 nm | ≤0.05%T | LCD | Yes | Included | Single-beam | Scanning + kinetics + PC software |
| 32091008 | HW723 | 320-1000 nm | 1.7 nm | ±0.5 nm | ≤0.05%T | Color touch | No | Optional | Single-beam | Touchscreen, narrow bandwidth |
| 32091009 | HW723PC | 320-1000 nm | 1.7 nm | ±0.5 nm | ≤0.05%T | Color touch | Yes | Included | Proportional double-beam | 8-cell holder, touchscreen, full software |
Standard accessories (all 723/HW723 models): 4 × 10 mm glass cuvettes, 2 × 10 mm quartz cuvettes, 10 mm cuvette holder, power cord, dust cover, manual, calibration certificate. HW723PC also includes automatic eight-cell sample holder.
Quick Recommendation
- 721 / 722– Budget-friendly for school teaching and basic industrial QC.
- 721-100– Customized for sugar refining and ultra-low concentration water trace detection (100 mm cuvette included).
- 7230G– Ideal for labs requiring on-site printed test reports (standard printer included).
- 723 (Auto)– Perfect for automated, high-precision routine testing.
- 723PC– Suitable for labs requiring spectral scanning and custom method development.
- HW723 / HW723PC– Advanced research-grade models with regulated lab compliance capability; HW723PC adds proportional double-beam, 8-cell holder and full software.
Complete Technical Specifications & Ordering Information
Full Parameter Comparison – All Models
| Parameter | 721/722/722S | 7230G | 723/723PC | HW723/HW723PC |
| Optical system | Single-beam | Single-beam | Single-beam | Single-beam / Proportional double-beam (HW723PC) |
| Wavelength range | 325-1000 nm (model dependent) | 320-1000 nm | 320-1000 nm | 320-1000 nm |
| Spectral bandwidth | 4 nm | 4 nm | 2 nm | 1.7 nm |
| Wavelength accuracy | ±2 nm | ±2 nm | ±1 nm | ±0.5 nm |
| Wavelength repeatability | 1 nm | 1 nm | 0.5 nm | 0.2 nm |
| Transmittance accuracy | ≤1%T | ≤0.5%T | ≤0.3%T | ≤0.3%T |
| Absorbance range | -0.301-3 A | -0.301-3 A | -0.4-4 A | -0.4-4 A |
| Stray light | ≤0.1%T | ≤0.1%T | ≤0.05%T | ≤0.05%T |
| Stability | ±0.002 A/h | ±0.001 A/h | ±0.001 A/h | ±0.001 A/h |
| Display | None or LCD | LCD | LCD | Color touchscreen |
| PC software | Optional | Optional | Standard on 723PC | Standard on HW723PC |
| Output interface | RS-232 (7230G) | RS-232 | RS-232 | USB, RS-232 |
Ordering notes: All models include factory calibration certificate. For custom dimensions, OEM branding, or bulk quotes, contact info@hawach.com.
Typical Applications
Industry-wide colorimetric applications include:
- Water & Wastewater:COD, ammonia nitrogen, total phosphorus, residual chlorine, heavy metals
- Food & Beverage:pigments, additives, sulfur dioxide, nitrite testing
- Sugar Refining:sucrose polarimetry, color and turbidity analysis (721-100 recommended)
- Clinical & Biomedical:hemoglobin, bilirubin, urine biochemical indicators
- Pharmaceutical QC:liquid color consistency, impurity color inspection
- Chemical & Petrochemical:APHA/Gardner color index, reaction monitoring
- Academic Teaching:Beer-Lambert law experiments and spectroscopy training
Core Model Differentiators
- 721-100 –Sugar Industry Specialized Model: Includes 100 mm cuvette and 10 cm holder as standard, providing extended optical path for sucrose polarimetry and ultra-low concentration detection.
- 7230G –Standard Dedicated Printer: Built-in printer for immediate hard-copy documentation – ideal for QC labs requiring printed records.
- HW723PC –Advanced High-Throughput System: Proportional double-beam design, automatic 8-cell sample holder, color touchscreen, and full UV-Solution 3.0 software suite.
Standard Method Compliance
- AOAC methods(food additives, nitrite, SO₂) – based on visible colorimetric reactions.
- GB national standards(water, food, environmental) – full compatibility with required wavelength ranges.
- EPA methods(colorimetric assays, residual chlorine) – suitable for visible-range colorimetric indicators.
- Sugar industry standards(ICUMSA, sucrose polarimetry) – 721-100 is specifically designed for this application.
- USP general chapters(colored solution verification) – HW723PC supports USP-style verification.
- Color index standards(APHA/Pt-Co, Gardner, Iodine) – all models can measure APHA color number.
Accessories & Customization
- Standard cuvettes & holders (included):4 × 10 mm glass cuvettes, 2 × 10 mm quartz cuvettes (723 series), 10 mm cuvette holder.
- 721-100 specialized accessories (included):100 mm glass cuvette and 10 cm holder.
- Available accessories:5-100 mm glass/quartz cuvettes, extended cuvette holders, external printer, UV-Solution software (included on 723PC/HW723PC), automatic 8-cell holder (HW723PC standard), quadruple sample holder, IQ/OQ/PQ documentation kits.
- OEM & customization:Private labeling, custom software interfaces, bulk packaging, distributor programs.
Manufacturing & Quality Advantages
- ISO 9001 certified production with strict individual factory calibration.
- High-purity optical components including C-T monochromator, 1200 L/mm grating, and imported tungsten lamps.
- Certificate of Analysis (COA) and factory calibration report included with every instrument.
- Global voltage compatibility (110-220 V, 50/60 Hz).
- Stable inventory -standard models ship within 7-14 business days; OEM orders 4-6 weeks.
Why Laboratories & Procurement Teams Choose Hawach
- Cost-effective alternative to major brands (Thermo GENESYS 30, Shimadzu UV-1280).
- Complete product family from basic education to regulated research -one supplier.
- Application-targeted models (sugar, printer-ready, high-throughput).
- PC software included on advanced models -no extra cost.
- 100 mm cuvette support across most models -critical for ultra-low concentration analysis.
- Full regulatory documentation available for GMP/GLP audits.
- OEM/private label support for distributors and volume customers.
Frequently Asked Questions
Visible Spectrophotometer vs UV-Vis Spectrophotometer – what is the difference?
A visible spectrophotometer measures only visible light (320-1000 nm) and is used for colored samples or colorimetric assays. A UV-Vis spectrophotometer also measures UV range (190-320 nm), enabling analysis of nucleic acids, proteins, and UV-active pharmaceuticals. Choose visible-only if your samples are inherently colored or can be derivatized to produce color.
How do I select the correct Visible Spectrophotometer model?
721/722 – basic teaching/QC; 721-100 – sugar industry / trace water; 7230G – printer needed; 723 (Auto) – automated routine testing; 723PC – scanning & PC software required; HW723/HW723PC – research & regulated labs (HW723PC adds double-beam, 8-cell holder).
What is T.A.C.F. function in a visible spectrophotometer?
T.A.C.F. (Time-based Automatic Calibration Function) periodically recalibrates the instrument during long-term operation, maintaining measurement stability and accuracy over extended use sequences.
Does the instrument support 100 mm cuvettes and PC software?
Yes. All Hawach visible spectrophotometers support 100 mm cuvettes with the optional extended holder. 721-100 includes it as standard. PC software (UV-Solution) is included on 723PC and HW723PC, optional on other models.
What are the advantages of the double-beam design in HW series?
Proportional double-beam (HW723PC) measures sample and reference simultaneously, compensating for light source drift and environmental interference, providing superior long-term stability, higher precision, and reliable results for regulated pharmaceutical QC and high-throughput workflows.
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