Scientific Instruments

Approx. Rs 2.15 Lakh / PieceGet Latest Price

Pure alkali halide crystals are transparent throughout the visible region of the spectrum. The crystals

may be colored in a number of ways

(1) by the introduction of chemical impurities

(2) by introducing an excess of the metal ion

(3) by X-ray, g-ray, neutron and electron bombardment

(4) by electrolysis

Colour centres produced by irradiation with X-rays

When a X-ray quantum passes through an ionic crystal, it will usually give rise to a fast photo-electron with an energy of the same order as that of the incident quantum. Such electrons, because of their small mass, do not have sufficient momentum to displace ions and therefore loose their energy in

producing free electrons, holes, excitons and phonons. Evidently these while moving near the vacancies form trapped electrons as well as trapped holes. The trapped-electron or trapped-hole centres so formed can be destroyed (bleached) by illuminating the crystal with light of the appropriate wavelength or warming it.

Thermoluminescence

Important information about the colour centres can be obtained by measuring the changes that occur when a coloured crystal is gradually heated. As the temperature is raised electrons and holes escape from their

traps at an increasing rate. The freed charges can recombine with each other or with other defects and give out luminescence by recombination.

The resulting thermoluminescence or ‘glow’ reaches maximum and then decreases to zero as the supply of trapped electrons or holes becomes exhausted. The plot of luminescence intensity verses temperature, taken

at a constant heating rate, is called the ‘glow curve’. It may contain one or many glow peaks, depending upon whether there are one or several different kinds of traps.

From the glow curve one determine the trap depth; the deeper the trap, the higher the temperature of the glow peak. A correlation between the temperature at which thermoluminescence occurs and the temperature at which particular band bleach can give valuable information about specific

centres. Typical results obtained from this set-up for

KCl crystal are shown in figure.

The experiment consists of the following

EXPERIMENTAL SET-UP FOR CREATING

THERMOLUMINESCENCE

(1) Sample: KBr or KCl single crystal

(2) Thermolumniscence Temperature Meter, TL-02

· Digital Thermometer

· Oven Power Supply

(3 Sample Holder

(4) Thermoluniscence Oven (0-423K)

(5) Black Box

FOR MEASUREMENT OF LUMINESCENCE

INTENSITY

(1) Photomultiplier tube: 931A

(2) PMT Housing with biasing circuit and coaxial cables etc.

(3) High Voltage Power Supply, Model: EHT-11

Output : 0-1500V variable (1mA max.)

Regulation : 0.05%

Display: 3½ digit 7-segment LED

(4) Nanoammeter, Model DNM-121

Range : 100nA to 100mA full scale in 4 ranges

Accuracy : 0.2%.

Display: 3½ digit 7-segment LED

Nunes Instruments , is  in the field of Instrumentation Sales Service & Repairswith 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.

Approx. Rs 1.45 Lakh / PieceGet Latest Price

Order Information:

• NUNES-01 (115 V) and NUNES-02 (230 V) is supplied with sample corvettes and caps (4 ea.), sample preparation kit, cloth for wiping corvettes (1), scissors, AC/DC power adapter and instruction manual.
• NUNES-100 kit includes 10 mL corvettes with caps (4 ea.), 100 mL plastic beaker, 170 mL plastic beaker, 100 mL graduated cylinder, 60 mL syringe with screw rim, 5 mL syringe, funnel, filter discs (25), spoon, pipettes (2), carbon powder packets (50), and de mineralizer bottle with filter cap for approximately 12 liters of deionized water.

Nutrient Analysis Photometer for Greenhouses and Hydroponics :

• Light blocking corvette holder
• Backlit LCD
• BEPS (Battery Error Prevention System) Alerts users in the event a low battery could affect readings
• PC compatible via USB
• Powered by rechargeable batteries or 12 VDC
• Save and recall logged data at the touch of a button.
• On-screen tutorial; with the tutorial function enabled, short guides relating to the current operation are displayed.
• HELP button; screen-specific help can view at the touch of a button.
• Method selection; users can easily select parameters via the Method button.
• Setup button: instrument preferences such as backlight intensity and screen contrast can be changed via the setup button

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.

Approx. Rs 49,000 / PieceGet Latest Price

• Durometer type MF is an exclusive design for testing memory foam. The large diameter presser foot and cylindrical indentor con???guration allow measurement by direct application to the test specimen.
•  Used the exclusive Micro- computer LSI circuit and crystal time base to offer high accuracy measurement.
• Digital display gives exact reading with no guessing or errors.Can communicate with PC for recording, printing and annualizing by the optional software and cable for Rs232C interface
•  Automatic power off to conserve power can get good accuracy and repetitiveness due to constant measurement force to eliminate the errors caused by arti???cially applied different force.

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.

Additional Information:

• Delivery Time: 1-2 week

Approx. Rs 42,500 / PieceGet Latest Price

Digital Readout with History Graph, PC Interface If you have been thinking about getting a simple low-cost Geiger counter, search no more. Whether you are checking antiques, testing for safe granite countertops, evaluating your porcelain dishes and bathroom fixtures, or just monitoring soil, air, water, and food for radioactive contamination, this economically priced, a super-small device does it all. Small enough for your pocket or purse (5”x3”x1”), sensitive enough for background levels, and loaded with useful features…

• Classic Geiger counter clicking sound, which can be on or off
• Count per minute (CPM) or exposure rate microSievert/hr (µSv/hr) or (Mr/hr) readout
• Range: up to 65,535 CPM (200 microSv/hr or 20 mg/hr)
• Audible alarm with adjustable threshold
• Data logging, with date/time stamp (select every second, minute, or hour)
• USB PC interface and free simplistic software for real-time or delayed downloading and manipulation of your data (Windows XP/Vista/Win7 32 and 64 bits)
• Adjustable backlight and battery saving features
• Rechargeable 9V battery included (can also use Alkaline 9V)
• Useful indoors or out. Can be wall mounted and powered by AC adapter (or vehicle adapter) for continuous monitoring. Detects Beta and Gamma (0.1~1 MeV)

Get one before there is an emergency in your area. Great for home, work, or school environments. A nice educational tool as well.

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.

Approx. Rs 5.6 Lakh / PieceGet Latest Price

These instruments are used in contact angle measurement, surface free energy analysis, and surface or interfacial tension measurement.The V TECH (VT) series contact angle meters have a range of systems starting from DMs-200, which is the basic model, to the most sophisticated VT-701.The VT-200 model is used to determine contact angle using the sessile drop method in static mode.

From model VT-CE1, all instruments can determine contact angle using the sessile drop method in static mode as well as in dynamic mode. The surface tension of a liquid sample can also be determined. The robust FAMACS software ensures that the system can also give dynamic contact sessile drop method,extension/contraction method, surface or interfacial tension of liquids with pendant drop method,sliding method, and dynamic sliding method. This is the most automatic model and even stage movement and droplet deposition can be controlled through the PC.

Optional accessories are numerous to choose from including computer-controlled dispenser, sliding method, temperature control of stage, temperature control of dispenser, and high speed camera.With the surface free energy software, the solid surface free energies and their components from the results of contact angle with different liquids can be measured.If surface free energy is the main analysis, then there is also an option called surface energy kit which consists of five kinds of probe liquids and proper needles.

Applications

The contact angle meter has application in the pharma field, where the wettability of powders can be studied. The contact angle measurement gives remarkable data on wettability and thus pharma companies can use this tool in their analytical research and development. It can also be used to analyze the processes of coating, cleaning, and surface finishing in research institutes.

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. Why 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.

Approx. Rs 1.89 Lakh / PieceGet Latest Price

Product Description

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.

Approx. Rs 5,500 / PieceGet Latest Price

Model No.: VT-1005

Standards: ASTM C 266

Specification: A base with a Vertical shaft and Two horizontal arms. The lower arms is adjustable for height. 1 no. Initial needle 1/12-inch dia. ¼ lb. Wt. 1 no. Final needle 1/24 inch dia. ¼ lb. Wt. 1 no. Glass base plate. Complete as above.

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.

Additional Information:

• Delivery Time: 1-2 week

Approx. Rs 98,500 / PieceGet Latest Price

Introduction

This experiment aims at measuring the charge of an electron and is perhaps the most basic of allatomic physics or modern physics laboratory experiments. It won Millikan the Nobal Prize in the year 1923.

The experiment depends on the ability to control, measure and balance very small force of the order 10-14N. The set-up consists of two horizontal parallel plates separated by about 5mm. The upper plate has a small hole through which microscopic oil droplets are sprayed in between the two plates with the help of an atomizer which is like a common perfume sprayer. These droplets get charged due to the frictional force during spraying. The free fall of these droplets in the space between the plates is observed in the gravitational field. A measurement of the velocity of fall along with the use of Stokes law leads to the calculation of the mass of the droplets and their radii if the oil density is known. These are of the order of 10-15kg and 10-6m respectively. By applying a potential difference between the plates, a uniform electric field is produced in the space between the plates. A measurement of the velocity of the negatively charged droplets rising in the electric field allows a calculation of the electric force on the droplets and hence the charge carried by them. In the experiment the droplets which rise and fall slowly are selected as they are expected to have a fairly small charge. These droplets are made to rise and fall several times. The repetitions of measurement of the velocities of rise and fall reduce the random error of their means. A fairly large number of droplets are observed and their charges are calculated. The analysis of the data on the total charge carried by the droplets shows that these total charges are integral multiples of a certain smallest charge which is the charge of an electron. This result also shows that the charge is quantized.The measurement of the charge on the electron can lead to the calculation of Avogadro’s number. The charge F (the Faraday) required to electro-deposit one gram equivalent of an element on an electrode during electrolysis is equal to the charge of the electron multiplied by the number of molecules in a mole. The Faraday has been found to be F = 9.625×10 7 coulombs per kilogram equivalent weight. Hence Avogadro’s number N = F/e.

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.

Approx. Rs 1.89 Lakh / PieceGet Latest Price

Product DescriptionWith the help of skilled professionals and good knowledgeable experience, we are involved in supplying, exporting and manufacturing quality-assured spectrum of Thermolumniscence Irradiation Unit in Roorkee, Uttarakhand, India.

Experiment:
* Microcontroller based menu driven
* Cost effective solution
* No radiation hazard
* High quality double stage rotary pump
* Long life tesla coil
* Fully self contained

Study of Thermoluminescence in alkali halide crystals need creation of F-centres (colour centres) in alkali halide crystals. To produce the F-centres, the crystals are exposed to ionizing radiation which in turn causes the loss of electron from halide ions. An electron then becomes trapped in the halide ion vacancy. The color is the result of the absorption of a photon by the trapped electron and excitation from the ground state to an excited state for the F-center. This is a classic case of particle in a box.

The source of ionizing radiation could be X-rays, electrons, gamma rays etc. These techniques are too Expensive and unaffordable for normal laboratories. Another method, although little less efficient, is by keeping Alkali halide crystals under low pressure, in the proximity of high Voltage. This in turn produces F-centres in the crystals.

This later technique has been adopted in this set up to make it economical and affordable for all laboratories. The setup is complete in itself and can be used straight away.

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.