50 of 74  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  o Conductivity and temperature   Activated sludge tank: o Oxygen meter , 2 pcs./1 basin  o ORP meter, 2 pc./ 1 basin  o NO$_{3}$ analyzer, 1pc. / basin  o Air flow meter for air pipes, installed within the common supply pipes of the  individual basins.  o Pressure gauges, installed within the common supply pipes of the individual basins.   Return and Excess PS: o Ultrasonic or radar level measurement at the pump sump o Magnetic Inductive Flow measurement for return sludge pressure line  o Magnetic Inductive Flow measurement for excess sludge pressure line  o Pressure gauges, installed within the common supply pipes of the individual basins.  o Safety measurements for Methane (CH$_{4}$) and Hydrogen sulphide (H$_{2}$S) with acoustical  and optical alarm at the pumping station room   Primary sludge:  o Magnetic Inductive Flow measurement for all sludge line  o Safety measurements for Methane (CH$_{4}$) and Hydrogen sulphide (H$_{2}$S) with acoustical  and optical alarm at the pumping station room   Mechanical Thickener: o Magnetic Inductive Flow measurement in the thickener feeding line for each thickener  o Magnetic Inductive Flow measurement in the polyelectrolyte dosing line for each  thickener  o Service water flow measurement for each thickener o Magnetic Inductive Flow measurement in the thickened sludge pump discharge line  for each pump.   Anaerobic sludge digestion:  o Capacitive/radio detection water level measurement for each digester  o Temperature measurement at three different levels of inside of the digester  o Temperature measurement for suction and pressure pipes of the recirculation  pipework (with transmitter and with displays)  o Temperature measurement for feeding pipes(with transmitter and with displays)  o Temperature measurement at heat exchanger, hot water supply inlet/outlet(with  transmitter and with displays)  o Temperature measurement at heat exchanger, sludge inlet/outlet(with transmitter and  with displays)  o pH measurement for pressure pipes of the recirculation pipework  o Magnetic inductive flow measurement in the recirculation suction pipes  o Pressure gauges , installed within the pressure pipes  3_Vol3_d4.3_Section 3_Plant Description_GIR_rev08 