2.1  WATER LEVEL, TEMPERATURE AND CONDUCTIVITY  DATA LOGGER, 22 PIECES  Data logger especially designed for water management. Water level,  temperature and conductivity data logger for continuous measurements  in piezometers, with all needed cables for a connection of data logger  and GPRS modem (and the suitable type of Laptop):  • Maximum diameter:  Ø 35 mm;  Water level sensor:  Ceramic, temperature compensated capacitive measuring cell with  barometric pressure compensation (relative/vented pressure cell);  Measuring range: 0-50 m;  Accuracy: ±0.05% FS;  • Conductivity sensor: 4-electrode conductivity cell;  Measuring range: 0-100 mS/cm (at least);  Accuracy: ±1% of measured value;  • Temperature sensor:  NTC resistance  Measuring range: -5 ° C - +50 ° C;  Accuracy: ±0.3 ° C, at least  • Memory capacity:  at least 4MB (to be able to store 6 months of  hourly measured data);  • Communication interface:  RS485 or/and SDI-12 or equivalent  Battery life time:  minimum 5 years at 60 min recording intervals;  • Cable length: up to 50** m;  robust cable with capillary tube;  • Housing:  Stainless steel; protection class IP68 for probe and IP67 for com  unit ( if applicable);  • Humidity absorber;  • Data format: should be able to store data in CSV, TXT, ZRXP  and/or XLS formats or equivalent • Warranty: 2 year (minimum).  Software:  Accompanying software for programing and reading data  from the data logger and software for appropriate communication  interfaces for communication with laptop and modem.  August 2020 EN-c4f_annexiitechspeciiitechoffer_en.docx  Page 5 of 76  EN-c4f_annexiitechspeciiitechoffer_en.docx