A. General:
1. Function:
a. To measure, indicate, and transmit the flow of a
conductive process liquid in a full pipe.
2. Type:
a. Electromagnetic flowmeter with operation based on
Faraday’s Law, utilizing pulsed dc coil excitation.
b. Full bore flowtube with magnetic field traversing the entire cross-section.
c. Insertion style, multiple single point probes inserted into a spool piece, or “linerless” spool piece designs with modular sensors inserted into standpipes, are not acceptable.
3. Parts:
a. Flowtube, transmitter, interconnecting cables, mounting hardware, and other parts as necessary.
B. Service:
1. Process Fluid:
a. As noted in tabulation.
b. Suitable for liquids with a minimum conductivity of
5 microS/cm and for demineralized water with a minimum conductivity of 20 microS/cm.
C. Operating Temperature:
1. Flowtube:
a. Ambient: Negative 5 to positive 150 degrees F, typical, unless otherwise noted.
b. Process (typical unless otherwise noted):
*Negative 20 to positive 350 degrees F for Teflon and PFA
*Negative 20 to positive 300 degrees F for Tefzel
*Zero to positive 185 degrees F for Neoprene
*Zero to positive 140 degrees F for Polyurethane
2. Transmitter:
a. Ambient (unless otherwise noted):
*Negative 20 to positive 140 degrees F for surface mount with
integral display
*Negative 30 to positive 150 degrees F for surface mount blind
*Positive 13 to positive 149 degrees F for integral mount with
integral display
*Negative 40 to positive 165 degrees F for integral mount blind
b. Storage (typical unless otherwise noted):
* Negative 22 to positive 175 degrees F for surface mount
* Negative 40 to positive 185 degrees F for integral mount
D. Performance:
1. Flow Range:
a. As noted.
2. Accuracy:
a. Plus or minus 0.25% of rate for all flows resulting from pipe velocities of 1 to 30 feet per second.
3. Turndown Ratio:
a. Minimum of 30 to 1 when flow velocity at minimum flow is at least 1 foot per second.
4. Repeatability:
a. Plus or minus 0.1% of reading.
5. Response Time:
a. 0.2 seconds maximum response to step change in output.
6. Stability:
a. Plus or minus 0.1% of rate over six months.
7. Ambient Temperature Effect:
a. 0.25% over operating temperature range.
E. Features:
1. Ability to check zero alignment without stopping flow.
2. Capable of measuring bi-directional flow.
3. Low flow cut-off adjustable between 0.01 and 1 foot per second. Below
selected value, output is driven to the zero flow rate signal level.
4. Non-volatile Totalizer.
5. Forward, Reverse, and Net Totals.
6. 75 process updates per second.
F. Process Connection:
1. Meter Size (diameter inches): As noted.
2. Connection Type:
a. Up to and including 24” meter sizes, 150-pound
ANSI raised-face flanges or wafer style depending on meter size, unless otherwise noted. For 30” and larger meter sizes, AWWA C207 Table 2 Class D flanges will be provided, unless otherwise noted.
3. Flange Material:
a. Carbon Steel, unless otherwise noted.
G. Power (Transmitter):
1. 120V ac, 60-Hz, unless otherwise noted.
H. Flowtube:
1. Meter Tube Material:
a. Type 304 or 316 stainless steel, unless otherwise noted.
2. Liner Material:
a. Polyurethane unless otherwise noted. b. For potable water service, appropriate approvals are required.
3. Liner Protectors:
a. Covers (or grounding rings) on each end to protect liner during shipment.
4. Coil Drive Power:
a. Not less than 0.5 Amps.
5. Electrode Type:
a. Flush or bullet nose as recommended by the manufacturer for the process liquid.
6. Electrode Material:
a. Type 316 stainless steel or Hastelloy-C, unless otherwise noted.
7. Grounding Rings:
a. Required, unless otherwise noted.
b. Material: Type 316 stainless steel, unless otherwise noted.
c. The use of a third “Grounding Electrode” is not acceptable.
8. Enclosure:
a. NEMA 4X, minimum, unless otherwise noted.
b. Enclosure shall be of all welded construction.
9. Submergence:
a. Temporary: If noted.
b. Continuous (up to 10 feet depth), NEMA 6P/IP 68: If noted.
10. Direct Buried (3 to 10 feet): If noted.
11. Hazardous Area Certification:
a. FM Class I, Division 2, Groups C, D (if noted) for flanged and wafer style meters.
b. FM Class I, Division 1, Groups C, D (if noted) for wafer style meters.
I. Transmitter:
1. Mounting:
a. Surface (wall), unless otherwise noted.
2. Display: Required unless otherwise noted.
a. Digital LCD display indicating flow rate and total.
b. Bi-directional flow indication: Required unless otherwise noted.
* Forward and reverse flow rate.
* Forward, reverse, and net non-volatile totalization.
3. Parameter Adjustments:
a. By keypad or non-intrusive means.
4. Enclosure:
a. NEMA 4X, minimum, unless otherwise noted.
b. Transmitters should have a dual compartment housing with the terminal block isolated from the electronics compartment.
5. Empty Pipe Detection:
a. If noted.
b. Drives display and outputs to zero when empty pipe is detected.
6. 4 to 20 mA Output Signal:
a. Isolated 4 to 20 mA, jumper selectable as internally or externally powered 5 to 24 V dc: 0 to 1000 ohm load.
b. Supports superimposed digital HART protocol.
7. Scalable Frequency Adjustment:
a. 0 to 10,000 Hz, externally powered at 5 to 24 V dc.
b. Transistor switch closure supports power loads up to 2W for
frequencies up to 4,000 Hz, and 5 V dc at 0.1W at maximum
frequency of 10,000 Hz.
c. Pulse can be set to equal desired velocity or volume in user
selectable engineering units.
d. Pulse width adjustable from 1.5 to 500 msec, below 1.5 msec pulse width automatically switches to 50% duty cycle.
8. Discrete Outputs: If noted.
a. Two discrete outputs, typical, rated for up to 30 volts, typical.
b. Programmable as noted for the following typical parameters as a minimum:
* High/low flow rates
* Percent of range
* Empty pipe zero
* Fault conditions
* Forward/reverse flow
9. Discrete Inputs: If noted.
a. Contact closure, configured as noted for the following typical parameters as a minimum:
* Reset totalizer
* Change rate
* Hold output constant
* Drive output to zero
* Low flow cutoff
10. Other: As noted
11. Output Testing:
a. Analog output test: The transmitter may be commanded to supply a specific current between 3.75 and 23.25 mA.
b. Pulse output test: The transmitter may be commanded to supply a specified frequency between 1 pulse/day and 10,000 Hz.
12. Damping:
a. Adjustable between 0.0 and 256 seconds.
13. Cables:
a. The cables used to interconnect the flowtube and transmitter for remote operation shall be a standard Belden or Alpha equivalent. Customized cables shall not be allowed.
b. Lengths: As required to accommodate device locations.
14. Built-in Diagnostics:
a. Features:
* Field programmable electronics.
* Self-diagnostics with troubleshooting codes.
b. Meter Verification Capability
i. Coil Resistance
ii. Coil Signature value
iii. Electrode Resistance
iv. High Process Noise Detection
v.. Electronics Temperature monitoring
vi. Wiring and Grounding verification
vii. Coil Fault detection
viii. Empty Pipe detection
c. Fully functional diagnostics in AMS Version 10.0 Device Manager including help screens with troubleshooting guidance.
d. Transmitter shall be capable of interoperability with flow tubes from all manufacturers. This includes the ability to drive the flow tubes at different coil currents and provide diagnostics for Transmitter Output Verification as stated above. These diagnostics would include Meter Verification, Grounding/Wiring Fault, High Process Noise, Coil Drive Fault, Empty Pipe and Electronics Temp.
e. Transmitter calibration will be certifiable without an external device (internal electronics diagnostics).
15. Factory Calibration:
a. Calibrated in an ISO 9001 and NIST certified facility.
b. Factory flow calibration system must be certified by volume or
weight certified calibration devices.
16. Primary Simulation System: If noted.
a. Quantity: One complete system provided for the project.
b. Verifies proper operation of the signal converter by simulating the flowtube output signal.
J. Manufacturer:
1. Emerson Process Management – Rosemount Division
a. Model 8750 Magmeter
b. Model 8714 Reference Calibration Standard.