A. Flow Element 1. Type a. Pulsed DC Type b. Insertion-type, “hot tap”, 2-inch ball valve or as specified by manufacturer. c. Bidirectional flow measurement 2. Function/Performance a. Operating Temperature: Process water temperatures of 30 to 110 degrees F. Process water to be monitored is finished drinking water with the following water quality parameters: total solids 100 to 200 mg/L, pH range 6.0 to 10.5, total chloramine residual 1.5 to 4.5 mg/L b. Radio Frequency Interface (RFI) protection: RFI protection shall be provided as recommended by the manufacturer. c. Pressure Rating: 1 to 30 psig, equal to the piping system where meter is installed. Average operating pressure approximately 10 psig. d. Piping system: 48-inch nominal diameter flanged steel metering spool installed on 48-inch lock-joint concrete pipe installed in 1913. Pipe slope at location of install is -1.06%. e. Meter shall be capable of running empty indefinitely without damage to any component. Supplier to not any exceptions to this requirement. 3. Physical a. Flow element and transmitter shall be installed on pipe in a below-grade vault. Ambient temperature range of 14 to +140°F, and relative humidity of 10 to 100 percent. b. Metering Tube: As per manufacturer specification. c. Flanges: 2-inch port available for “hot tap” insertion. Manufacturer to provide installation requirements. d. Isolation valve for hot tap insertion shall be provided. e. Electrodes: Type 316 stainless steel or as specified by manufacturer. f. Housing: The meter housing shall be IP68 Rated for Continuous Submergence. g. Finish: All external surfaces shall have chemical-and corrosion resistant finish h. All materials in contact with the potable water being measured shall be NSF/ANSI 61 certified. i. Installation location dimensions: Flow element will be installed in below-grade metering vault having interior dimensions of 10-feet wide by 10-feet long by 9-feet high. 48-inch pipe runs through chamber with centerline elevation of 3.5 feet above chamber floor. Available height above crown of pipe is 40 inches. Overhead space available via manhole access for installation Maximum available horizontal clearance on one side of pipe is approximately 3 feet. 4. Power Requirements a. Receiving power from associated transmitter. 5. Accessories/Documentation Required. a. Factory calibration: Factory calibrated. A copy of the calibration report shall be included at the time meter is furnished. b. Grounding: Meter shall be grounded in accordance with manufacturer’s recommendation. Provide grounding ring, ground wires, gaskets, etc. as required. All materials in contact with the potable water must be NSF 61 certified. c. Signal cable for installation between the flow element and flow transmitter shall be provided. The cable shall be the type approved by the instrument manufacturer for the intended purpose of interfacing the element to the transmitter. Length of cable shall be a minimum of fifty (50) feet. B. Flow Element 1. Type a. Microprocesser based, intelligent transmitter compatible with flow element provided. b. Bidirectional flow measurement c. Remote from the element as required by the physical location. 2. Function/Performance a. Accuracy (including flow element): ±0.5 percent of actual flow rate for full-scale settings of 1.0 to 30 fps. ±1.0 percent for flow rate from low-flow settings of 0.3 to 1.0 fps. b. Operating Temperature: -30 to 140 degrees F. c. Output: Two (2) Isolated 4-20 mA with HART protocol (one for each flow direction). Current output adjustable over the full range of the instrument. d. Diagnostics: Self diagnostics with on-screen display of results e. Display: Digital indicator displaying flow in gallons per minute (gpm) f. [Optional] Totalizer: A fully configurable totalizer integral to the transmitter. Totalized forward and reverse flows shall be calculated and displayed separately. Scaling factors shall be field adjustable and shall be selected to provide a totalizer multiplier of a power of 10. g. Empty Tube Zero: The transmitter shall include a feature that will lock the output at zero when no flow is detected. The empty tube zero feature shall be enabled automatically when the transmitter detects no flow or manually through a contact input. h. Low flow cutoff. 0.3 ft/second adjustable. i. Signal converter shall be of the "smart" type that can be diagnosed and recalibrated with the use of a hand-held communicator/calibrator device. One device shall be furnished. j. Provide electrode cleaning unit to match flow element requirements. 3. Physical a. Flow element and transmitter shall be installed in a below-grade vault. Ambient temperature range of -4 to +140°F, and relative humidity of 10 to 100 percent. b. Transmitter shall be suitable for surface mounting. c. Enclosure shall be NEMA 4X (IP65) d. Finish: All external surfaces shall have chemical-and corrosion resistant finish 4. Power Requirements a. The transmitter shall be a 120 VAC powered instrument. 5. Accessories/Documentation Required. a. Keypad where required for transmitter configuration. b. For instruments that require a dedicated programming device for calibration, maintenance, or troubleshooting, one such programming device shall be provided. The programming device shall include appropriate operation manuals. For systems that allow the programming device functions to be implemented in software, running on a laptop computer, the software shall be provided instead of the programming device. c. For systems that allow programming device functions to be implemented in software running on a laptop computer, a serial interface shall be provided with all accessories required to properly communicate over the serial link. One licensed copy of the diagnostic/interface software shall be provided. Software shall be capable of running under Microsoft’s Windows 10 or higher operating system. C. Manufacturers. No substitutions will be accepted for this project. a. McCrometer b. Seametrics c. Rosemount d. Endress+Hauser e. Foxboro
