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6.1.E. - Page 27 <br />GENERAL REOUIREMENTS <br />A. Mixing Unit <br />a. Free standing and fully submersible <br />i. Floating devices and jet -based mixing devices with pumps located outside the <br />tank are not acceptable <br />b. Can be self -installed <br />c. 120/240 VAC <br />d. Max power draw 2,400 watts / mixing unit <br />e. Chemical feed attachment available <br />f. Solar powered (optional) <br />g. All exposed parts must be stainless steel, Type 316 preferred <br />h. Chlorine/chloramine-resistant parts <br />i. NSF/ANSI Standard 61 certified <br />j. Equipment must fit through a standard hatch size <br />k. Performance criteria: <br />i. Temperature: During continuous operation of the mixer, all temperatures shall <br />converge to within 1.0°C at least once every 24 hours <br />ii. Disinfectant Residuals: During continuous operation of the mixer, disinfectant <br />residual shall converge to within 0.20 ppm at least once every 72 hours. <br />1. Control Center: <br />i. Secured, weather -resistant enclosure <br />ii. On/off indicator for mixing unit <br />iii. Manual control and programmable control <br />iv. Built-in thermal shut-off protection <br />v. Built-in current overload protection <br />vi. Built-in automatically activated motor shut-off if water level drops below <br />specific water level in tank <br />vii. GFCI-protected disconnect switch <br />m. SCADA compatible, with the following outputs: <br />i. Digital output signal indicating motor running <br />ii. Digital output signal indicating fault <br />iii. Digital input/output signal allowing remote motor on/off <br />iv. RS -485 or dry contact connections <br />B. Water Quality Monitoring Station <br />a. Reagent -less amperimetric probe type analyzer that measures, at a minimum, <br />temperature, pH, Oxidation -Reduction Potential (ORP), and total or free chlorine <br />b. Minimum continuous sampling rate at 10 gallons per hour <br />c. Measurements must be displayed in real time on the station display and continuously <br />logged for analysis. Data must be easily extractable. <br />d. Analyzer must be able to continuously measure the sample stream without the need <br />for reagent addition <br />e. Manual sample port <br />f. Operator must be able to program all set points, time overrides, and alarms via the <br />controller <br />NOTICE INVITING BIDS <br />2016-2017 RECYCLED WATER TANK WATER QUALITY CONTROL SYSTEM 10 of 16 <br />