Bidhan Chandra Krishi Viswavidyalaya - West Bengal
39956047 equipment purchase , atomic absorption spectrophotometer : monochromator should have littrow or better design with motorized drive for automatic wavelength selection and peaking. mirror free fiber optics light transmission for maximum light throughput and best detection limit preferred wavelength range 190 – 900 nm diffraction grating 1800 lines/mm blazed at 236 nm and 597 nm is preferred reciprocal linear dispersion: 1.6 nm/mm or better background correction should have built in continuum source double beam background correction using high intensity deuterium arc lamp. spectral bandwidths user selectable automatic slit widths of 0.2, 0.7 and 2.0 nm at their optimized slit height. detector wide range segmented solid state detector is preferred lamp turretminimum 4 lamp turret multielement/single element lamp requirement ca,cu,fe,mg,si,zn,co,cr,cu,fe,mn,ni,k,na, as, pb gas controls should have fully computer controlled with oxidant and fuel monitoring. keyboard activated remote ignition system with air acetylene. acetylene flow should be automatically adjusted prior to the oxidant change when switching to or from nitrous oxide acetylene operation. safety functions interlocks to prevent ignition in absence of proper burner head, the nebulizer/end cap, or the burner drain system preferred. sample introduction system modular sample introduction system consisting of the quick change spray chamber, burner head and nebulizer units. alignment of the flame in the light beam is fully automatic, using a motorized burner mount for vertical and horizontal burner adjustment and automatic software controlled self optimization of the burner position. the optimization of the operating flame condition is also fully automatic and software controlled. local items to be quoted(a) suitable exhaust hood (b) uhp grade acetylene gas filled cylinder (c) double stage gas regulator for acetylene gas cylinder (d) online ups of suitable capacity with 30mins back up warranty one year installation/demonstration free of cost , chns analyser : 1. fully automated pc controlled elemental analyser for solids, liquid and semi solid samples. 2. operating modes for measurement of chns, chn, cns, and s. 3. sample weight range : 0.2 to 1000 mg for all the modes. 4. detection range: 0 to 100% for all elements ( c, h, n, s) with the capability of measuring at least 14mg absolute carbon in chns mode and more than 40 mg in cn mode. 5. limit of detection : 50 ppm or better 6. standard deviation:?0.1% of absolute. 7. analysis time: the instrument should be able to analyze chns simultaneously within 10 min orless. 8. fully digital electronics that should be fully integrated in unit, no external control panels required. 9. should have mass flow controller/electronic flow controller for constant flow of carrier gas. quick swap clamp connections for fast maintenance furnace system • should have two zone double furnace system, separate for combustion and reduction with independent temperature control for each furnace. it should be possible to set difference temperature for combustion and reduction in chns mode. • controlled furnace temperature should be 1200 deg c or more. • should have possibility to use ceramic/quartz ash finger to handle high halogen or fluorine contents sample. • the furnace should have 8 years warranty from the manufacturer.separation system • advanced chromatographic separation of gases. • complete instrument control over elution process with provision of auto zero of baseline after each element elution.• baseline separation of c from n peak signal with a concentration ratio of 12000:1 or better • full separation of all analytes and there should be no peak tailing or peak overlap.detector system• oxygen intrusion free thermistor technology based temperature stabilized tcd detector for measurement of c h n s.• the tcd detector should have 8 years warranty from the manufacturer. auto sampler system• electromechanical auto sampler system with 100 positions or more in single tray. • the auto sampler should hold at least 500 mg of soil sample.• pneumatic auto sampler is not allowed.• the auto sampler should be zero blank and ensure complete removal of atmospheric gases before sample injection into the high temperature reactor/furnace. carrier gas • possibility of using argon or helium gas as carrier gas.there should be an option to switch off the supply while the instrument is at working temperature to save carrier gas and time. software • should be windows 10 based and should have display of set and actual pressures, flow rates, temperatures, number of samples analysed with provision for setting maintenance interval with warning when maintenance needed • should have segmented leak check through software to enable identification of exact position of leak. consumables• to be supplied with consumables sufficient for 1000 sample analysis in chns/cns mode. local supplies • the vendor should quote for the complete system including the following items:• oxygen gas should be used as combustion gas & helium gas as a carrier gas. • 1 no oxygen gas cylinder with purity of 99.99% along with a regulator.• 1 no helium gas cylinder with purity of 99.99% along with a regulator.• windows 10 pro, i3 processor with 4gb ram and 500gb ssd, with 21” monitor, with keyboard and mouse. training and demonstrations• onsite free of cost installation and training by the manufacturer or its indian agent.• operative and service manual to be supplied• detailed service & operation manual should be provided.necessary documents• catalogue in the original.• all technical specifications should be printed on the manufacturer’s catalogue/ datasheet. • vendor should submit a list of a minimum of 10 users of the quoted model from government institutions/universities in india.• the vendor should submit at least one 10 year old po copy of the quoted instrument from any government institute/university in india. • the vendor should submit at least 5 po copies along with an installation report of the installed instrument from any government institutions in india. • the oem/vendor should have a trained service engineer. a relevant training certificate from oem is to be attached as evidence.• the vendor/oem must have service support in india along with service engineer based in west bengal to provide after sales service of the instrument. , uv visiblespectrophotometer : specification optical design: double beam spectral bandwidth: 2 nm light source : (typical lifetime) xenon flash lamp (3 years guaranteed) detectors: dual silicon photodiodes wavelength range: 190–1100 nm wavelength accuracy: ±0.5 nm wavelength repeatability: <±0.2 nm scan speed: slow, medium and fast (up to 1600 nm/min) photometric linear range –2a to +3.5a photometric accuracy: ±0.002a at 0.5a ,±0.004 a at 1.0 a, ±0.008a at 2.0a photometricrepeatability : ±0.001a at 1a photometric noise : <0.00020a at 0.0 a; <0.00030 a at 1.0 a; <0.00040 at 2.0 a photometric drift : <0.0005 a/hr stray light : < 1.0%t 198 nm (kcl) , <0.05%t at 220 nm (nai), <0.03%t at 340 nm (nano2) baseline flatness: ±0.002a 8 position cell changer peltierthermostatted cell holder(20–60 °c) display 7 inch color touchscreen, tiltable, high definition, 800 × 1280 pixels...