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6.1.E. - Page 28 <br />g. Peristaltic pump <br />i. Positive displacement, peristaltic type tubing pump with brushless variable <br />speed motor, non -spring loaded roller assembly in the pump head, integral tube <br />failure detection system, and flexible tubing with attached connection fittings. <br />ii. Specifications: <br />1. Repeatability: +/- 1 percent <br />2. Accuracy: +/- 1 percent <br />iii. Pump is equipped with stop/start, operating mode selection, auto priming, and <br />reverse direction. <br />h. Requirements for total/free chlorine sensor: <br />i. Type 3 -electrode amperometric membrane -type sensor <br />ii. Measuring range of 0-20 mg/L <br />iii. Resolution of 0.01 mg/L <br />iv. Response time (T90) of approximately 2 minutes <br />v. Interferences: Chlorine dioxide (C102) and ozone (03) <br />vi. Calibration: slope calibration achieved at the device by DPD -4 method <br />(DPDI+DPD3) analytical determination. Zero -point adjustments not <br />necessary. <br />i. Requirements for DH sensor: <br />i. Combined 2 -electrode type pH probe <br />ii. Measuring range of 0-14 <br />iii. Resolution of 0.01 <br />iv. Span: 97% of theoretical or higher <br />v. Response Time (T95): 1 second <br />vi. Offset: +/- 0.20 pH <br />vii. Calibration: 3 -point calibration with reference solutions <br />j. Requirements for ORP sensor: <br />i. Combined 2 -electrode type ORP probe with double junction <br />ii. Measuring range of +/- 1000 mV <br />iii. Resolution of +/- 0.5 mV <br />iv. Calibration: 1 -point or 2 -point calibration that can be performed with 1 or 2 <br />reference solutions <br />k. SCADA compatible <br />i. 8 analog output (4-20 mA or 0-10 V) <br />ii. 8 digital relay <br />iii. Modbus TCP or serial RS -485 communication <br />1. Equipped with adjustable pressure regulator for flow control and a flow switch for <br />flow verification <br />m. Enclosure must be made of weatherproof material and parts <br />C. Chlorine Chemical Feed System <br />a. Skid -mounted chemical metering pump, chemical container, chemical level sensors, <br />enclosure for pump and chemical containers, injection nozzles, tubing, and spill <br />containment storage <br />NOTICE INVITING BIDS <br />2016-2017 RECYCLED WATER TANK WATER QUALITY CONTROL SYSTEM 11 of 16 <br />