nit no. 17 ( 21-22 ) / cwa ( wns ) ii hp / item no. 02 procurement of ph meter ( benchtop ) and conductivity / tds meter in different quality control laboratories under cwa ( wns ) -ii division, w.t.p. haiderpur. , ph& conductivity / tds meter equipment type : benchtop group: physical analysis: water / waste water principle: electrochemistry the instrument will have large color graphic lcd display which should show reading, connection, time, date, sample id, user id, calibration information etc. the instrument will be capacble to hold the memory upto 2000 data points with time and date stamp. the data can be transfered to pc with usb or rs232 cable. the multimeter will have memory for upto 10 methods per channel.the meter will be supplied with electrode arm and probeholder to make it easier to maintain and place into sample solutions. themeter will be supplied with ph and conductivity probe / electrode and will be capable of measuring ph, conductivity, resistivity, salinity, temperature and total dissolved solids. the multimeter and electrodes will be supplied with coa ( certificate of analysis ) & certificate of conformance ( coc ) . ip54-rated hosuing handles splashes. technical specification ph range : -2.000 to 20.000 resolution: 0.1, 0.01, 0.001 relative accuracy: ± 0.002 calibration points: upto 6 points calibration editing:yes conductivity range : 0.001 ?s to 3000 ms resolution: 0.001 ?s minimum, 4 significant figures minimum relative accuracy: 0.5% reading± 1 digit reference temp.:5, 10, 15, 20, 25 degree c ( default ) temperature compensation: linear ( 0 to 10.0 % / oc ) , nln, nlfu, usp / ep compatible cell constant: 0.001 to 199.9 calibration points: upto 6 points calibration editing:yes resistivity range: 2 ohm to 100 meg-ohms resolution: 2 ohms-cm relative accuracy: 0.5% ±1 digit salinity type: practical salinity or natural sea water range: 0.01 to 80.0 ppt nacl equivalent; 0.01 to 42 pt practical salinity resolution: 0.01 relative accuracy: ±0.1 description tds ranges : 0 to 200 ppt resolution: 4 significant digits relative accuracy: ±0.5% ± 1 digit tds factor range:linear 0.01 to 10.00 minimum number of modules: 3 methods: up to 10 data logging number of points: 2000 with time and date stamp power universal ac power adapter; 90-260vac, 50-60 hz deliverables: probe / electrode for ph and conductivity, usb and rs232 cable, power cable, buffers for ph and conductivity standards, ph storage solution, electrode holder / stand approved makes / brands: thermo fischer scientific-orion / wtw / metrohm / lovibond