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| DFS-II Engineering Specifications |
Greyline DFS-II Doppler Flow Switch
Standard features include : |
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Sensor - strap-on, single head ultrasonic |
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Sensor cable - 20ft (6m) shielded coaxial pair |
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Installation - sensor compound kit and stainless steel pipe clamp |
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Enclosure - watertight NEMA4X (IP67) polycarbonate |
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1 relay - 5 amp DPDT |
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Set point - ON/OFF adjustment 0.25 to 10 ft/sec (0.076 to 3 m/sec) |
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Failsafe mode - switch selectable |
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Indication - relays and signal strength LED's |
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Sensitivity - adjustable |
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Time delay - adjustable, 0-60 seconds |
| Power input - 120VAC 50/60Hz |
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Electrical surge protection
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1 manual - Installation and Operation
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OPEN CHANNEL FLOW MONITOR SPECIFICATIONS
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SCOPE : This specification covers an ultrasonic, echo-ranging type open channel flow meter as manufactured by Greyline Instruments, Massena, New York / Long Sault, Ontario. This instrument shall provide for indicating, transmitting, totalizing and data logging of the flow rate through a flume, weir, or other primary measuring device.
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A. GENERAL |
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Flow Monitor to consist of an non-contacting ultrasonic sensor, connecting cable, and a remote enclosure with indicating, transmitting, controlling and data logging electronics.
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Measurement accuracy shall be ±0.25% and shall be automatically temperature compensated.
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Sensor cable length shall be as required by installation, not to exceed 500 ft (152 m).
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System shall have no moving parts and shall not contact flowing water.
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B. SENSING ELEMENT
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Sensor shall withstand accidental submersion to 20 psi.
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Sensor minimum range shall be 8" (203.2 mm) and maximum range shall be 15 ft (4.57 m).
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Sensor shall be constructed of PVC.
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Sensor operating temperature shall be from -40°F to 150°F (-40°C to 65°C).
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Sensor shall include integral temperature sensor. Temperature sensors requiring separate mounting and wire runs shall not be accepted.
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C. SENSOR CONNECTING CABLE
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Provide RG62AU coaxial cable, minimum length 25 ft (7.6 m), with waterproof, potted bond to the Sensor head. |
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Level and temperature signals shall be conducted on one single coaxial cable. Separate or multiple-conductor cables shall not be accepted. |
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Extended sensor cable shall be RG62AU coaxial to a maximum of 500 ft (152m). Cable shall be spliced with screw terminal connections in manufacturers recommended steel NEMA4 Junction Box. |
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Sensor cable shall be installed in grounded metal conduit. |
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D. TRANSMITTER
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The transmitter shall provide for field calibration to common primary metering devices, plus allow entry of "K" and "n" values for calibration to nonstandard flumes, weirs or open channels. |
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Field-calibration shall be via built-in 3-key calibration system with menu selection of parameters. Systems requiring calibration by Parameter codes, BCD switches or external calibrators shall not be accepted. |
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Calibration data shall be password protected and permanently stored through power interruptions for a minimum of 12 months. |
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Field calibration shall allow selection and automatic conversion of measurement units, measurement span, high/low flow alarm relay and flow proportional relay pulse rates. |
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Transmitter shall permit field programmable damping to smooth output in turbulent flow conditions, and programmable rejection time to disregard false signals from rain, wind, floating objects and spurious echoes. |
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Transmitter operating temperature shall be from -5° to 140°F (-20° to 60°C). Transmitter shall contain a thermostat-controlled enclosure heater for condensation protection below 30°F (-1°C). |
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Have a built-in 50,000 point data logger with USB and RS232C output and connecting cables. Data logger shall support time and date-stamped logging and display daily flow reports including total, average, minimum, maximum and times of occurrence. |
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Include Windows software for data log retrieval, graphing and export. |
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Transmitter shall have an isolated 4-20mA output into a 1000 ohm maximum load and user-selectable 0-5V output. |
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Provide 3 relay contacts rated 5 amp SPDT programmable to operate a remote totalizer, a sampler, high-low flow alarm plus echo loss alarm. |
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Provide a 4-digit LCD display scaled in user-selected engineering units and visible without opening the Transmitter enclosure. |
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Provide a 16-digit alphanumeric display for calibration menu, running totalizer, flow reports, or error message display of echo loss or other fault conditions. |
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Transmitter shall be housed in a wall-mount, watertight NEMA4X (IP66) enclosure with hinged, clear cover. Mounting hardware shall be included. |
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Transmitter Displays indicating flow rate, units of calibration, maximum flow rate and flow totalizer shall be visible without opening cover. |
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Transmitter electronics shall be surge protected on AC power input, sensor, 0-5V and 4-20 mA output. |
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Transmitter power input shall be 115VAC 50/60Hz with power consumption of 6.2 Watts or less.
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E. OPTIONAL FEATURES FOR INSERTION AS REQUIRED
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Electronics enclosure shall include an Intrinsic Safety Barrier. Sensor, connecting cable and junction boxes shall be rated intrinsically safe to Class I,II,III, Div. I,II, Groups C,D,E,F,G.
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Have a thermostat controlled Enclosure Heater for transmitter operation at temperatures below freezing.
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Have manufacturer's recommended Enclosure Sunscreen to permit electronics enclosure mounting in direct sunlight.
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Have manufacturer's recommended Sensor Sunscreen to permit temperature-compensated sensor mounting in direct sunlight.
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Have manufacturer's recommended sensor mounting stand.
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Transmitter power input shall be 200-260VAC 50/60Hz with maximum power consumption of 6.2 Watts or less.
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Transmitter power input shall be 9-36VDC with minimum power consumption of 2.1 Watts.
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F. MANUFACTURER
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Open Channel Flow Monitor shall be Greyline Model OCF 4.0 and warranted against defects in materials and workmanship for one year.
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