nit no. 12 ( 21-22 ) / cwa ( wns ) ii hp procurement of digital photometer for measuring chlorine using dpd method in water / waste water under the division of cwa ( wns ) -ii. , digital photometers using dpd method, specifications: chlorine measuring range using dpd method: optics: leds, 3 interference filters ( if ) and photo sensor in transparent sample chamber wavelength specifications of wavelength selection automatic, wavelength : 530 nm = 5 nm; 560 nm = 5 nm parameters facility : chlorine and ph as an additional option measuring range: chlorine hr tablet: 0.1-10 mg / l cl2 dpd, chlorine liquid / powder: 0.02 - 4 mg / l cl2 dpd, chlorine tablet: 0.01 - 6 mg / l cl2 dpd, ph value l 6.5 - 8.4 phenol red, ph value t 6.5 - 8.4 phenol red wavelength accuracy ± 1 nm photometric accuracy 3 % fs ( at 20oc -25 oc ) power supply : 4 micro batteries ( aaa ) , capacity approx. 17 hoursor 5000 tests auto - off: yes display: backlit lcd ( on keypress ) data storage: internal memory minimum 100 bluetooth interfaces : yes calibration : factory calibration and user calibration. reset to factory calibration possible weight : basic unit approx. 250 gram to 275 gram. protection class : ip 68 environmental conditions: temperature: 5-40 oc rel. humidity: 30-90 % ( non-condensing ) pc software: it will be supplied with pcsoftware to import data directly from the photometer to the windows -based pc. tablet: will be supplied with standard brand supporting tablet with software additional accessory : bluetooth dongle compatible with photometer warranty : 12 months, demo, installation, transportation should be free of cost at haiderpur w.w.