Nunes Instruments

• The Wavelength range 325-1000 nm is set manually
• Measured values can be transferred to PC via RS232 port
• Spectral Bandwidth 2nm, photometric range 0-200%T, -0.3A~3A
• 100 mm sample holder
• Transmittance, absorption, concentration, factor modes from the dial on the front panel

Features

· Suitable for1H and11F nuclei

· FET based marginal Oscillator

· Digital Display of frequency and current

· Clear display of resonance peaks

· Compatible with general purpose CRO

Introduction

Nuclear Magnetic Resonance (NMR) was discovered by Bloch and Purcell in the year 1945. Over the years it has developed into a very useful and powerful tool in solid state physics, chemistry and biology. In medical application this technique, under the name Magnetic Resonance Imaging (MRI) has been developed as an excellent imaging method for clinical diagnosis. In this method use is made of Zeeman interaction of the magnetic dipoles associated with the nucleus when placed in a external magnetic field.

Elementary Magnetic Resonance

An atom whose nucleus has a nulcear spin I will have a magnetic moment as follows

= g_nI (1)

where _nis nuclear magneton, and g is g-factor. Under the influence of an external static magnetic field (H), these nuclear magnets can orient in distinct directions. Each spin orientation corresponds to a particular energy level given by

E = g_nHm_j(2)

with mj= -I, -(I-1), ...............(I-1), I

where mjis magnetic quantum number

The splitting of levels will therefore be-

DE = g_nH or = hn₀ (3)

where n₀is the r.f. frequency applied perpendicular to the static magnetic field. Now if the spins are subjected to a purturbation by an oscillating magnetic field with its direction parallel to the static magnetic field and its frequency n₁such that the quantum hn₁is equal toDE = hn₀, we say that there is a resonance between n₁and n₀. This will induce transition between neighbouring sub levels (m_j=I) and in turn will absorb energy from the oscillating field. Thus, at resonance, we get a peak due to the absorption of energy by the system.

Experimental Technique

Nunes Instruments , is  in the field of Instrumentation Sales Service & Repairs with 40 years of experience.  We provide service & repairs to your old high precision instruments and equipment.  We provide cost effective service & Repair to any brand, any make instruments  with service warranty. W hy not try once?

Instruments of Any Type, Any Make, Analog/Digital, Any Condition  Indian or  Imported

• Laboratory Instrument, Test Equipment,
• Scientific, Measuring, Precision Instrument,
• Analytical, Bio Medical, Survey, Electrical,
• Electronic Instruments ,Weather, Metrology.

Double Beam Microprocessor UV-VIS Spectrophotometer equipped with a Peltier and Sipper System is a sophisticated analytical instrument designed for precise and accurate measurement of absorbance and transmittance of liquid samples across the ultraviolet (UV) and visible (VIS) spectrum. 

• Design: In a double beam spectrophotometer, the light source is split into two beams before passing through the sample and reference compartments. This configuration allows for continuous comparison between the sample and reference, improving accuracy by compensating for any fluctuations in the light source intensity.
• Advantage: It ensures higher stability and accuracy, reducing errors due to light source drift and other variations.

• Functionality: The spectrophotometer is controlled by an integrated microprocessor, which automates various functions such as wavelength selection, data acquisition, and data processing.
• User Interface: Typically, these instruments come with a user-friendly interface, often featuring a touchscreen or keypad for easy operation and navigation through menus.

• Wavelength Range: The instrument covers both the UV range (usually 190-400 nm) and the visible range (400-700 nm), making it versatile for a wide variety of applications.
• Applications: It can be used for analyzing compounds in pharmaceuticals, chemicals, environmental samples, and more.

• Temperature Control: The Peltier system provides precise temperature control of the sample compartment, which is crucial for experiments that require maintaining specific temperatures.
• Advantage: This feature is particularly beneficial for kinetic studies, enzyme reactions, and other temperature-sensitive assays.

• Sample Handling: The sipper system automates the process of drawing liquid samples into the spectrophotometer’s cuvette, enhancing throughput and consistency.
• Convenience: It is particularly useful for high-throughput analysis, reducing manual handling and potential for contamination.
• Technical Specifications:
  1. Wavelength Accuracy: Typically ±0.1 to ±0.5 nm.
  2. Spectral Bandwidth: Commonly around 1-2 nm, ensuring fine spectral resolution.
  3. Photometric Accuracy: Generally ±0.005 to ±0.002 Abs, ensuring reliable and precise measurements.
  4. Light Source: Often uses a deuterium lamp for UV and a tungsten-halogen lamp for visible range.
  5. Detector: Usually a silicon photodiode or photomultiplier tube for sensitive detection.
  Software and Connectivity:
  • Data Analysis: The integrated software allows for complex data analysis, including spectral scanning, kinetics, and quantitative analysis.
  • Connectivity: Modern spectrophotometers offer USB and sometimes wireless connectivity for easy data transfer and integration with laboratory information management systems (LIMS).
  Applications:
  • Pharmaceutical Quality Control: Quantifying active pharmaceutical ingredients and impurities.
  • Environmental Testing: Analyzing water quality by measuring pollutants and contaminants.
  • Biochemical Research: Studying enzyme kinetics, protein concentrations, and DNA/RNA quantification.
  • Chemical Analysis: Determining concentrations of various chemicals in solution.

Technical Parameters:

Model VT-285

Optical system: CT grating monochromator

Wavelength range: 195nm - 1020 nm

Wavelength accuracy: +/-2nm
Spectral bandwidth 2nm

Wavelength repeatability: 1nm

Stray light: <= 0.3%T @220nm

Photometric accuracy: +/- 0.5% T

Photometric repeatability: 0.2%T

Stability: +/- 0.004 A/h @500nm

Work Pattern: T, A, C

Display area: 0-200%T, -0.3 - 3A

Display modes: 4 LCD

Zero setting Automatic

Weight: 12 kg

Nunes Instruments , is  in the field of Instrumentation Sales Service & Repairs with 40 years of experience.  We provide service & repairs to your old high precision instruments and equipment.  We provide cost effective service & Repair to any brand, any make instruments  with service warranty. W hy not try once?

Instruments of Any Type, Any Make, Analog/Digital, Any Condition  Indian or  Imported

• Laboratory Instrument, Test Equipment,
• Scientific, Measuring, Precision Instrument,
• Analytical, Bio Medical, Survey, Electrical,
• Electronic Instruments ,Weather, Metrology.

• Description

Double Beam Microprocessor UV-VIS Touch Screen Spectrophotometer is a sophisticated analytical instrument used to measure the absorbance and transmittance of liquids and solids over the ultraviolet and visible light spectrum (typically 190 nm to 1100 nm). The instrument is designed for a wide range of applications including pharmaceuticals, biotechnology, environmental testing, and materials science.

• Design: Involves two light paths – one passing through the sample and the other through a reference. This design helps in compensating for any fluctuations in the light source intensity, providing more accurate and stable measurements.
• Benefit: Enhances accuracy and reliability by comparing the sample signal to a reference simultaneously, minimizing errors due to light source drift.

• Functionality: Automates various aspects of the instrument’s operation, including wavelength selection, calibration, and data processing.
• Benefits: Enhances precision, repeatability, and ease of use, allowing for complex analyses with minimal user intervention.

• User Interface: Provides an intuitive and user-friendly interface for controlling the spectrophotometer. The touch screen allows for easy navigation through menus and settings.
• Features: Often includes features like multi-language support, graphical display of spectra, and interactive data analysis tools.

• Functionality: The accompanying software allows for advanced data analysis, storage, and reporting. It can often be connected to a computer for extended capabilities.
• Benefits: Facilitates data management, enables complex calculations, and provides tools for compliance with regulatory standards such as GLP (Good Laboratory Practice).

• Range: Typically covers from 190 nm to 1100 nm, encompassing both the ultraviolet and visible regions.
• Applications: Suitable for a broad array of applications including quantitative analysis, kinetic studies, and spectrum scanning.

• Resolution: Offers high spectral resolution (e.g., 0.1 nm) for distinguishing closely spaced absorption bands.
• Sensitivity: High sensitivity allows for the detection of low concentration samples with accuracy.

• Flexibility: Equipped with interchangeable sample holders for different types of cuvettes and sample sizes.
• Automation: Some models feature automatic sample changers for high-throughput analysis.

• Pharmaceuticals: Quantification of active pharmaceutical ingredients (APIs), impurity profiling, and dissolution testing.
• Biotechnology: Protein and nucleic acid quantification, enzymatic assays, and DNA/RNA purity checks.
• Environmental Testing: Monitoring of pollutants and contaminants in water, soil, and air samples.
• Materials Science: Characterization of optical properties of materials, coatings, and thin films.

The Digital Analytical Balance (P6 Series) is a high-precision weighing instrument designed for laboratory, research, and quality control applications. With a maximum capacity of 300 grams and an impressive readability of 0.001 grams (1 mg), it ensures reliable and accurate measurements for sensitive tasks.

This balance features a user-friendly large LCD display with a backlight for clear visibility in all lighting conditions. Models in the P6 series offer an RS232C interface for data transfer to a printer or PC, making it ideal for documentation and analysis.

Its AC/DC dual power system with a rechargeable battery allows more than 20 hours of continuous operation, ensuring flexibility and portability in various environments.

• 1 mg readability with stable, repeatable performance

• External calibration ensures measurement accuracy

• Auto shut off and low battery alert for energy efficiency

• Full tare and auto zero tracking functions for accurate net weight measurement

• RS232C interface for easy data export

• Durable, large weighing pan supports a wide range of sample sizes

• Portable design with long battery backup for field or mobile use

• Research laboratories

• Pharmaceutical analysis

• Chemical testing

• Educational institutions

• Industrial quality control

The VT35 Double Beam Portable UV/Vis Spectrophotometer is a high-precision analytical instrument engineered for routine laboratory analysis and quantitative measurement tasks. Inspired by the performance class of the PerkinElmer Lambda-35 series, this instrument delivers reliable optical performance with a wavelength range of 190–1100 nm.

The device features multiple variable bandwidth settings (0.5 nm, 1 nm, 2 nm, and 4 nm), enabling superior measurement control and allowing the user to tailor resolution according to analytical requirements. The system integrates seamlessly with UV WinLab-type software for step-by-step workflow guidance, advanced data processing, and intuitive operation. Designed for portability, the VT35 provides high-quality double-beam performance in a compact, user-friendly form.

• Double-beam optical design for high stability and accuracy

• Wide wavelength range from 190 to 1100 nm

• Variable bandwidths (0.5 / 1 / 2 / 4 nm) for flexible measurement resolution

• Software-controlled system with advanced data analysis features

• Portable and suitable for routine laboratory testing

• Ideal for quantitative, qualitative, and kinetic measurements

• Reliable performance comparable to high-end laboratory spectrophotometers

• Pharmaceutical quality control

• Chemical and biochemical analysis

• Environmental testing (water, pollutants, etc.)

• Academic and research laboratories

• Food and beverage analysis

• Material science and optical studies