nit no. 20(21-22)/cwa(wns)ii hp/item no. 02 procurement of double beam uv-visible spectrophotometer with pc compatibility and software for different wtp/stp laboratories under cwa (wns)-ii division. , double beam uv-visible spectrophotometer with pc compatibility and software. (make : hach, thermo scientific, agilent, perkin elmer, wtw) specification for uv-visible range spectrophotometer equipment type : bench top analysis : water/waste water principle : photometry the spectrophotometer will be dual beam (viz. uv-visible) operation and with the reference cell position for kinetics application. it will be mandatorily have an 8-cell carousel. the spectrophotometer must have room-light resistance, allowing lid-open operation for improved speed and convenience. the spectrophotometer will have of automated cell changers and cell holders, sipper and fibre optics 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 wifi-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 100 mm path length. 10.there shall be 8-position cell changer with switchable turret. 11. it must have optional facility for 4-position cell changer (long path cells) and peltier-thermostat single holder (200 degree c-60 degree c). detector type : dual silicon photodiodes display : 7-inch colour touch screen, high definition, 800 x 1280 pixels photometric : ±0.002 a at 0.5 a accuracy instrument : ±0.004 a at 1.0 a : ±0.008 a at 2.0 a wavelength accuracy : ±0.5 nm baseline flatness : ±0.002a compartments : 8-position cell changer (standard) also accommodate (optional):peltier thermostat cell holder (20-60 degree celsius) sipper accessory (optional) drift : (at 500 nm after 1 hour warm-up) <0.0005a/hr electricalrequirements : external ac to dc converter, voltage and frequency (hz) selected automatically, 100-240 volts, 50-60 hz keypad : touch screen 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 1 a 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 (nacl), <0.03 % t at 340nm (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