Laserfiche WebLink
be suspended by PVC cable of sufficient length to reach bottom of the drywell <br /> and have a weighted collar. The level switch shall be a Gems LS-750, or <br /> approved equal. <br /> D. Magnetic Flowmeter <br /> 1. The magnetic flow meter shall consist of a flow tube FE and a converter FIT, _ <br /> complete with all necessary interconnecting cables and conduits. The <br /> magnetic flow meter shall be of the low frequency electromagnetic induction <br /> type and shall produce a DC pulse signal directly proportional and linearto the <br /> flow rate, with the duration not less than 50 milliseconds. The meter shall be <br /> suitable for bi-directional flow with full scale flow rates. Complete zero stability <br /> shall be an inherent characteristic of the metering system. Meters requiring <br /> field zero adjustment will not be acceptable. The meter accuracy shall not be — <br /> affected by changes in fluid pressure, temperature, viscosity, or conductivity. <br /> 2. Flange connections shall be ANSI Class 150 as required by mechanical _ <br /> Drawings. Flanges shall be coordinated with Contractor installing piping. <br /> 3. Stainless steel grounding rings shall be provided at both ends of the flow tube <br /> when required by the manufacturer. The tube internal liner material shall be — <br /> polyurethane, unless recommended otherwise by the manufacturer for the <br /> application and approved by the Engineer. Electrode material shall be 316 <br /> stainless steel and shall be flush type. The meter shall incorporate a high _ <br /> impedance amplifier of 100,000 Megohms or greater, eliminating the need for <br /> electrode cleaning systems. <br /> 4. The converter electronics shall be mounted remotely as shown on Contract - <br /> P&ID Drawings. The converter shall be microprocessor controlled, utilizing <br /> digital signal processing with automatic zero correction to provide a linear 4-20 <br /> mA signal proportional to the forward flow rate specified.The electronics shall <br /> provide totalized pulse output and positive zero return control. Rangeability <br /> shall be field adjustable over a 100 to 1 range. Field adjustable signal <br /> dampening shall be provided. Low flow cutoff shall be provided to eliminate — <br /> flow transients when no flow is present in the pipe. A rate indicator and <br /> totalizer scaled in engineering units shall be provided and shall be viewable on <br /> a LCD display(s)through a clear window in the enclosure.The converter shall <br /> have self diagnostics which constantly check for proper operation. If a failure <br /> occurs, a fault indication shall be provided to notify the operator of a problem. <br /> The converter shall contain a self test mode to allow the operator to manually <br /> simulate the output 4-20 mA signal to any value between 0% and 100% to <br /> check out any driven devices in the loop. The converter shall be rated to <br /> operate in an ambient temperature range from -4°F to 1317. <br /> 5. The converter electronics shall be designed for operation from a power source <br /> per Device Index, with a power consumption of less than 24 watts. <br /> 6. The flow element shall be sealed to provide full submergence rating. — <br /> 7. When converter electronics are shown to be mounted remotely, additional <br /> special cabling without any splices (Cabling between flow element and remote <br /> mounted flow indicating transmitter), mounting hardware, and devices <br /> necessary to complete the installation shall be provided bythe manufacturer at <br /> no additional cost to the City. <br /> Division III-199 NEI Phase II Water and Sewer <br /> July 2007 CIP Nos.7468, 7589, 7590 <br />