procurement of laboratory double beam uv-visible spectrophotometer under cwa(wns)ii division. , the spectrophotometer will be dual beam (viz uv-visible) operation and with the reference cell position for kinetics application. it will mandatorily have 8-cell carousel. the spectrophotometer must have room-light resistance allowing lid-open operation for improved speed and convenience. the spectrophotometer will have option of automated cell changers and cell holders, sippers, and fibre optic probes for measurements outside of the sample compartment. it must accommodate high throughput measurements and temperature control. the spectrophotometer will have following features: 1. spectrophotometer will be double beam (uv- visible)/reference cell. 2. it will have high resolution touch screen user interface. the spectrophotometer must be capable of operating through computer also. 3. there will be 8-position cell changer with switchable turret. 4. it will have onboard methods, reporting and data export. 5. it will be networking capable and will have wi-fi adaptor. 6. it is capable of open-lid operation. 7. there will be room light resistance. 8. it will have sipper (optional). 9. it must accommodate cells upto 100mm path length. 10. it must have optional facility for 4-position cell changer (long path cells) and peltier- thermostat single cell holder (20°c-60°c). detector type• dual silicon photodiodes. display• 7- inch colour touch screen, high definition, 800x1280 pixels. photo-metric accuracy instrument • ±0.002a at 0.5a • ±0.004a at 1.0a • ±0.008a at 2.0a wavelength accuracy • ±0.5 nm baseline flatness • ±0.002a compartments• 8-position cell changer (standard) also accommodates (optional): • peltier thermostat cell holder (20-60 °c) • sipper accessory (optional) drift • (at 500 nm after 1 hour warmup) <0.0005a/hr electrical requirements • external ac to dc converter. voltage and frequency (hz) selected automatically, 100–240 volts, 50–60 hz. keypad • touchscreen lamp • xenon flash lamp (>5 years typical, 3 years guaranteed) noise • (rms at 500 nm 60 consecutive measurements) • =0.00020a at 0a at 260 and 500 nm • =0.00030a at 1a at 260 and 500 nm • =0.00040a at 2a at 260 and 500 nm optical design • double beam photometric display • -3a to +5a photometric range • –2a to +3.5a photometric repeatability • ±0.001a at 1a measured at 1.0a at 546 nm spectral bandwidth • 2 nm stray light • < 1.0%t 198 nm (kcl) ,<0.05%t at 220 nm (naci), <0.03%t at 340 nm (nano2) wavelength data interval • 0.1 nm, 0.2 nm, 0.5 nm, 1 nm, 2 nm, 5 nm wavelength range • 190 nm – 1100 nm wavelength repeatability • < ±0.2 nm wavelength scan speed • slow, medium and fast - up to 1600 nm/min printer • capable to connect with printer computer operation • the spectrophotometer can be operated from compatible computer and software. computer and operational software to run spectrophotometer will be a part of the spectrophotometer. connections • single usb-a supports flash memory devices for method and data storage • duplex usb-a on side supports connection to a computer running optional remote control software, keyboard, mouse • export data to network or pc via usb, ethernet, or wi-fi usb adaptor, available • print via usb, ethernet or wi-fi usb adaptor available warranty • 3 years make:- hach/thermo fisher scientific/agilent/perkin elmer/wtw/lovibond.