procurement of analytical balance under cwa (w&s)-ii division. procurement of analytical balance under cwa (wns)-ii division. , specifications for analytical balance make:-mettlar, roy-electronics, redwag, shimadzu general features ergonomic mechanical design it shall have spacious weighing chamber and large open-door clearance allow easy access to the weighing pan and facilitate use of laboratory glassware of various sizes and dimensions. it will also have improved aluminium base of the balance guarantees stability of the weighing system. the weighing balance shall have tool-free disassembly and assembly of the weighing chamber. there will be usb interface at the balance front makes it easier to communicate with peripherals. level sensing system there shall be built in level sensing system. the in-built sensors measure tilts and display graphic message on the weighing device screen. leveling system facilitates adjustment, controls the level state, and informs about level deviations, all this in accordance with glp and gmp. antistatic weighing chamber the weighing chamber panes will feature antistatic coating compensating electrostatic charges on the sample and accessories used for mass measurement. *antistatic coating has been applied in balances with the readability of d=0.01mg display customization functions displayed on the colour 5” touch screen can be customized to suit carried out process and user’s needs. flexible configuration of buttons, labels and text fields is also a great advantage. the weighing balances will have feature sand numerous functions supporting and supervising mass measurement in laboratory, facilitating operation and limiting the risk of “human factor” errors, e.g. automatic adjustment, data control, alibi memory, automatic reports and ambient conditions monitoring. technical specifications will be as follows technical specifications maximum capacity [max] 82 g / 220 g minimum load 1 mg readability [d] 0.01 mg / 0.1 mg verification scale interval [e] 1 mg tare range –220 g standard values repeatability (5% max) * 0.01 mg repeatability (max) * 0.06 mg minimum weight (usp)20 mg minimum weight (u=1%, k=2) 2.0 mg permissible values repeatability (5% max) * 0.02 mg repeatability (max) * 0.1 mg linearity ± 0.05 mg / ±0.2 mg stabilization time*** 2 s adjustment internal verification yes oiml class i display 5” capacitive colour touch screen keypad 6 keys protection class ip 43 databases 7 touch-free operation 2 programmable proximity sensors usb-a (interchangeable) 2 usb-b 1 rs 232 1 db9 tare and print external buttons wi-fi 802.11 b/g/n ethernet 10 / 100 mbit power supply 12 ÷ 16 v dc power consumption 4 w operating temperature +10 ÷ +40 °c atmospheric humidity**** 40 ÷ 80% transport and storage temperature –20 ÷ +50 °c weighing pan dimensions ø 90 mm open-work ø 85 mm standard weighing chamber dimensions 190 × 190 × 222 mm weighing device dimensions 351 × 205,5 × 348 mm net weight 7.3 kg gross weight 9.3 kg packaging dimensions 495 × 400 × 515 mm accessories peripheral devices • epson dot matrix printer • barcode scanners • wd-6 lcd display cables, converters • p0108: rs 232 cable (balance-computer) • p0151: rs 232 cable (balance - epson printer) • usb cable type a-b