FLOW METERS (DIFFERENT SERVICES) TECHNICAL REQUIREMENTS FOR IAS

This article is about general and technical requirements for FLOW METERS TYPES FOR DIFFERENT SERVICES used in Integrated Automation System or Building Automation System.

FLOW METERS (DIFFERENT SERVICES) TECHNICAL REQUIREMENTS FOR IAS

• ULTRASONIC FLOW METER FOR WATER SERVICE <Modify as required to match project design>

  1. General: Single-channel non-wetted ultrasonic meter to measure volumetric fluid using transit-time flow measurement
  2. Measurement: Single channel (Two Channel) measurement
  3. Enclosure: Epoxy-coated aluminum NEMA 4X, IP66 weatherproof
  4. Accuracy: +/- 2 percent of velocity reading at 1 to 40 feet per second
  5. Rangeability: 400 to 1
  6. Repeatability: +/- 0.2 to 0.5 percent at full scale
  7. Input Power: 120 VAC or 24VDC
  8. Operating Temperature: 14 degrees F to 140 degrees F
  9. Control Panel: Stainless Steel case.  Digital display: 2-line x 16-character LCD display, LED backlight, configurable to display up to 4 measurement parameters in sequence
  10. Keypad: 6-button internal keypad.
  11. Output: Single Channel – one 4-20 mA (Two Channel – two 4-20 mA)
  12. Output Units: Velocity in feet per second or meters per second
  13. Volumetric Flow: Cubic feet (ft3), cubic meters (m3), gallons (gal), and liters (L)
  14. Totalizer (forward and reverse): Cubic feet (ft3), cubic meters (m3), gallons (gal), and liters (L)
  15. Transducer Temperature Range: –40 degrees F to 140 degrees F
  16. Provide all slide track brackets, stainless steel chain or strap, for a complete installation. Provide connecter cables and connectors as required for a complete system
  17. Acceptable Manufacturers: <Confirm list>
      • Honeywell
      • EMCO
      • Approved equal

• ULTRASONIC FLOW METER FOR STEAM SERVICE <Modify as required to match project design>

  1. General: Single-channel ultrasonic meter to measure the mass flow rate of saturated or superheated steam and the volumetric flow of wet steam
  2. Measurement: Single Channel measurement
  3. Enclosure: Stainless steel NEMA 7/4X
  4. Accuracy: +/- 1 percent of velocity reading at 3 to 150 feet per second
  5. Rangeability: 1500 to 1
  6. Repeatability: +/- 0.2 to 0.5 percent at 1 to 150 feet per second
  7. Input Power: 120 VAC or 24 VAC/VDC
  8. Operating Temperature: -40 degrees F to 140 degrees F
  9. Display: 2-line x 16-character LCD display, LED backlight, configurable to display up to 4 measurement parameters in sequence
  10. Output: 4-20 mA
  11. Transducer:
      1. Type: T9
      2. Temperature Range: –40 degrees F to 400 degrees F
      3. Pressure Ratings: 0 to 250 psig operating pressure, 750 psig test pressure
      4. Material: Titanium
      5. Connection: Threaded or flanged connection
  12. Acceptable Manufacturers: <Confirm list>
      1. Honeywell
      2. EMCO
      3. Approved equal

• INSERTION TYPE TURBINE METER FOR WATER SERVICE <Modify as required to match project design>

  1. General:
     • Turbine Insertion Flow Meter sensing method shall be impedance sensing (iron magnetic and non-photoelectric), with volumetric accuracy of +/- 2 percent of reading over middle 80 percent of operating range, and +/- 4 percent of reading over the entire operating range.
     • Turbine Insertion Flow Meter shall have maximum operating pressure of 400 psi and maximum operating temperature of 200 degrees F continuous (220 degrees F peak).
     • All wetted metal parts shall be constructed of 316 stainless steel. Flow meter shall meet or exceed all of the accuracy, head loss, flow limits, pressure and material requirements of the AWWA standard C704-70 for the respective pipe or tube size.
     • Analog outputs shall consist of non-interactive zero and span adjustments, a DC linearly of 0.1 percent of span, voltage output of 0-10 V, and current output of 4-20 mA.
     • Pressure drop on flow meter shall not exceed 0.25 inches of WC.
  2. Installation: Install in water systems with a minimum of 10 pipe diameters unobstructed flow. Double turbine insertion required at between 10 and 4 diameters unobstructed flow.
  3. Acceptable Manufacturers: <Confirm list>
     • Honeywell
     • Hersey
     • Omnicon
     • Approved equal

• VORTEX SHEDDING FLOW METER FOR LIQUID, STEAM AND GAS SERVICE <Modify as required to match project design>

  1. Output: 4-20 mA, 0-10 VDC, 0-5 VDC
  2. Maximum Fluid Temperature: 800 degrees F (427 degrees C)
  3. Wetted Parts: Stainless Steel
  4. Housing: NEMA 4X
  5. Turndown: 10:1 minimum
  6. Accuracy: 5 percent  of calibrated span for liquids, 1 percent of calibrated span for steam and gases
  7. Body: Wafer style or ANSI flanged to match piping Specification
  8. Acceptable Manufacturers: <Confirm list>
     1. Honeywell
     2. Johnson-Yokagawa
     3. Rosemount
     4. Approved equal

• MAGNETIC FLOW METER FOR WATER SERVICE <Modify as required to match project design>

  1. General Requirements:
     1. Sensor shall be a magnetic flow meter, which utilizes Faraday’s Law to measure volumetric fluid flow through a pipe.
     2. The flow meter shall consist of two (2) elements, the sensor and the electronics. The sensor shall generate a measuring signal proportional to the flow velocity in the pipe.  The electronics shall convert this EMF into a standard current output.
     3. Electronic replacement shall not affect meter accuracy (electronic units are not matched with specific sensors).
        • Provide a four-wire, externally powered, magnetic type flow transmitter with adjustable span and zero, integrally mounted to flow tube
        • Output: 4-20 mA
        • Flow Tube: Stainless steel
        • Electrical Enclosure: NEMA 4, 7
        • Approvals: UL or CSA
        • Stability: 1 percent of rate over six (6) months
        • Process Connection: Carbon steel, ANSI 150 LB, size as required
     4. Meter Accuracy:
        1. Under the reference conditions of a 68 degrees F media temperature, a 68 degrees F ambient temperature, a +/- 1 percent nominal power supply voltage, 10 diameters up stream and 5 down of straight piping and a fully developed flow profile; the meter must meet the following requirements:
           • Plus or minus 0.8 percent of reading accuracy in the flow range of 1.65 – 33 ft/sec +/- (0.66/Velocity actual feet per second +0.4) percent of reading accuracy in the flow range of 0 – 1.65 feet per second.
           • Meter repeatability shall be +/- 0.1 percent of rate at velocities > 1.65 feet per second.
        2. Calibration: The sensor must be calibrated on an internationally accredited (i.e. NAMAS) flow rig with accuracy better than 0.1 percent.  Calibration shall be traceable to National Institute of Standard and Technology.
        3. Construction:
           • The meter piping material shall be AISI 304 stainless steel
           • The meter flange and enclosure material shall be carbon steel
           • The external surface of the sensor is to be treated with at least 0.006 inches (150 µm) of Corrosion resistant two-component paint
           • The inner meter piping shall be protected with a neoprene liner or similar liner
           • The electrode material shall be AISI 316 Ti or better
           • The sensor be ANSI class 150 pounds
        4. Electronics:
           • The sensor shall contain a SENSOR-PROM, storing calibration and factory default settings, i.e. the identification of the sensor and size
           • An ISO 9001 approved company shall manufacture the sensor and electronics
           • As standard, the electronics must be installable directly on the sensor or installable (remote) up to 1500 feet from the sensor as a maximum
           • With local electronics installation, the electronics shall be able to withstand three (3) feet water submersion for up to 30 minutes
           • The electronics shall be compatible with the following power specifications:
             1. 15/230 VAC +10 percent to 15 percent 50-60 Hz
             2. The power consumption must be 10 Watts or less independent of meter size
           • The meter electronics shall be able to produce simultaneous scalable current and frequency/pulse output. The frequency output shall be linearly proportional to flow rate and scalable from 0-10 kHz.  The pulse output shall be scalable from 50 to 5000 milliseconds duration, suitable for an electromechanical totalizer in engineering units
           • The electronics must have an internal totalizer for summation of flow
           • The output of the electronics must be individually, galvanically isolated with an isolation voltage of more than 500 V
        5. Output:
           • The current signal must be either 0-20 mA or 4-20 mA proportional to the flow velocity
           • The output current signal must accommodate 20 percent over range without loss in linearity
           • The electronics shall have an alphanumeric LCD display showing actual flow and totalized flow in engineering units
           • The display and keyboard must be rotatable so that the display can be viewed regardless of sensor orientation
        6. Error Detection:
           1. The electronics must be able to detect the flowing error conditions:
              • Signal connection between electronics and sensor interrupted
              • Loss of current to the coil circuit
              • Load on the current output
              • Defective electronics
              • Defective sensor
              • Empty pipe
           2. The electronics must have an Error Log where all error conditions occurring within a period of 180 days are stored
        7. Electronic Replacement Programming:
           • The electronics must be immediately replaceable without the need of cable disconnection or renewed configuration programming
           • When the supply voltage is applied, the electronics must self configure and display flow without keyboard contact (no programming required)
           • The electronics must be provided with an automatic zero flow setting
           • The electronics shall be programmable with respect to:
             • User display options and menu
             • Setting data
             • Configuration of outputs
             • Zero ‘cut-off’ from 0 percent to 9.9 percent of maximum flow
           • For ease of programming, the electronics shall be programmable away from the meter using the meter Sensor-Prom and a 9 V battery
           • The electronics shall be suitable for operation in an ambient temperature range of -4 degrees F to 120 degrees F
        8. Acceptable Manufacturers: <Confirm list>
           • Honeywell
           • Rosemont
           • Toshiba
           • Hersey Measurement
           • Yokogawa Industrial Automation
           • Endress & Hauser
           • Approved equal

• VENTURI FLOW METER FOR WATER SERVICE <Modify as required to match project design>

  1. UL listed, suitable for all service application conditions
  2. Body minimum working pressure rating shall equal or exceed service pressure
  3. Switch electrical rating shall be 230 volts AC 3.7 ampere, 115 volts AC 7.4 ampere, and 125 VAC 115-230 VAC AC Pilot duty
  4. Unit shall have two SPDT switches. Actuating flow rated shall be field adjustable for the specified and indicated service. Switch location shall preclude exposure to turbulent or pulsating flow conditions. Flow switch shall not cause pressure drop exceeding 2 psid at maximum system flow rate.
  5. Flow Sensing Element: Differential-pressure Venturi-type designed for installation in piping.
  6. Construction: Bronze or cadmium plated steel with brass quick connect fittings and attached tag with flow conversion data and rated flow.  Ends shall be threaded for 2 inches and smaller and flanged or welded for larger than 2 inches.
  7. Differential transmitter shall be dual range industrial grade as specified above.
  8. Connect differential pressure to venturi and repipe quick connect fittings for measurement. Provide ball valves to isolate quick connects and differential pressure transmitter.
  9. Apply Venturi-type flow meters where minimum flow range is no less than 40 percent of maximum flow.
  10. Acceptable Manufacturer: <Confirm list>
      • Honeywell
      • McDonnel-Miller
      • Approved equal