Ultrasonic Flow Meter Model CSLFC
Loop Powered 4-20 mA Output, Flows to 3000 GPM, 3" to 10" Pipe, Carbon Steel
DESCRIPTION
Clark Sonic® Ultrasonic Flow Meters are ideal for measurement of flow rates of acoustically conductive liquids including most clean liquids and many liquids with entrained solids.
Main advantages include excellent long term stability, no pressure drop, broad fluid compatibility, high accuracy and low cost. Also, there are no moving parts.
At the heart of the CSLFC flow meter/flow transmitter is a proprietary mixed signal ASIC which allows sophisticated timing, control and transducer drive circuitry to be combined on a single integrated circuit. The ASIC uses a special algorithm that is an improvement upon the standard single-path measurement technique. Using the "sing around" method, the ultrasonic transducer alternates between transmitting and receiving to measure differences in flight time between upstream and downstream transmissions. A sound pulse is transmitted from an upstream transducer towards a downstream transducer like a traditional time-of-flight measurement. However, the received sound pulse then triggers a second downstream transmission that then triggers a third and so on for a specific number of cycles. This process is repeated in the upstream direction.
Because it takes an average flight time over multiple cycles to compute the difference in flight times, the approach yields a significant improvement in timing accuracy when compared with the time-of -flight difference of a single sound pulse in each direction. This algorithm, combined with the pico-second timing resolution of the ASIC, provides the precise time measurement capability necessary for compact, small diameter ultrasonic meters.
The output of the CSLFC ultrasonic flow meter is unaffected by changes in fluid temperature, density and viscosity as the flow calculation is independent of the speed of sound.
Wetted materials include ULTEM® encapsulated ultrasonic transducers with a choice of elastomer seals and epoxy coated carbon steel body material.
SPECIFICATIONS
GENERAL
Flow Range: Bi-directional, field selectable per "Standard Models" table
Accuracy: ±0.75% of full scale
Operating Temperature: -40 to 190°F (-40 to 87.8°C)
Response Time: User selectable, 2 or 10 seconds
Viscosity Range: 0.2 to 150 cSt (0.2 to 150 mPas)
Liquid Density: 30.6 to 74.9 lb/cu.ft. (490 to 1200 kg/m3)
Max. Working Pressure: 200 PSI (13.8 bars)
Pipe Sizes: 3", 4", 6", 8", 10"
Pipe Connections: ASME class 150 flange
Electrical Enclosure: Integral to Body casting with gasketed cover; One 1/2"
NPT conduit connection (plugged when model ordered with metric threads)
and one M16 x 1.5 connection (plugged when model ordered with NPT threads)
Electrical Connections: Screw terminal connections on PC board
Enclosure Rating: NEMA 4 (IP 65)
Power: 18 to 36 VDC
WETTED MATERIALS
Ultrasonic Transducers: ULTEM® Encapsulated Seals: EPDM, Buna-N, Neoprene™, FKM, or other Body Material: Schedule 40, epoxy coated, carbon steel pipe
OUTPUT
Analog: 2-wire, 4-20 mA output; Output is 4 mA from zero to min. flow
(see Standard Model table)
Error Detection: An optically isolated sink output is activated under
certain detectable fault conditions, such as transducer failure or
overly noisy output due to flow stream anomalies, as might be seen
due to excessive bubble entrainment. The optional Fault output is
an optically isolated NPN transistor capable of sinking up to 25 mA
from a voltage source of no more than 48 VDC.
Direction of Flow: Optional output to indicate direction of flow is available.
Activation or deactivation of an optically isolated 25 mA (max. 48V no load voltage)
sink output indicates flow direction. Error detection is not available when this
option is ordered.
Optional Temperature Sensor: 3 wire RTD, 100 Ohm, Platinum, Class A, IEC60751, built in to
transducer shell for monitoring process temperature; optional 4 or 8 pin electrical
connector recommended with this option.
| Optional NEMA 4 four or eight-pin receptacles installed in transmitter conduit connection and factory wired along with mating circular connectors simplify field installation. | |
 4R/C & 8R/C Circular |
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ELECTRICAL
3" to 10" Schedule 40 Carbon Steel Pipe, ASME 150 Flange
| Pipe Size | Dimensions (Inches) | |||||||
| A | B | C | D | E | F | Bolt Circle Diameter | Number of Holes | |
| 3" | 11.00 | 7.50 | 3.50 | 6.54 | 2.62 | 0.75 | 6.00 | 4 |
| 4" | 13.00 | 9.00 | 4.00 | 6.54 | 2.62 | 0.75 | 7.50 | 8 |
| 6" | 16.00 | 11.00 | 5.09 | 6.54 | 2.62 | 0.88 | 9.50 | 8 |
| 8" | 18.00 | 13.50 | 6.11 | 6.54 | 2.62 | 0.88 | 11.75 | 8 |
| 10" | 22.00 | 16.00 | 7.18 | 6.54 | 2.62 | 1.00 | 14.25 | 12 |
STANDARD MODELS
| Model | Pipe Size | *Field Selectable Full Scale Ranges (GPM) | *Field Selectable Full Scale Ranges (LPM) | |||
| High/Low | Min. | Max. | Min. | Max. | ||
| CSLFC3 | 3" | L | 3.0 | 200 | 11.0 | 750 |
| H | 6.0 | 400 | 23.0 | 1500 | ||
| CSLFC4 | 4" | L | 4.5 | 300 | 17.0 | 1150 |
| H | 7.5 | 500 | 29.0 | 1900 | ||
| CSLFC6 | 6" | L | 9.0 | 600 | 35.0 | 2300 |
| H | 18.0 | 1200 | 68.0 | 4500 | ||
| CSLFC8 | 8" | L | 15.0 | 1000 | 57.0 | 3800 |
| H | 30.0 | 2000 | 114 | 7600 | ||
| CSLFC10 | 10" | L | 22.5 | 1500 | 86.0 | 5700 |
| H | 45.0 | 3000 | 165 | 11000 | ||
| *F.S. ranges can be user specified to 125% of each stated high (H) range with no change to specifications and to 25% of each low (L) range with some specification modification. | ||||||
FIELD SERVICE
Two opposing CSLFC ultrasonic transducers are inserted into fixed ULTEM® drywells and held in place with light spring force. A locating keyway in the drywell aids insertion and positioning of the transducers. In the event of field failure of a transducer, replacement is straightforward and can be accomplished without removing the pipe spool and shutting down the process. The electrical PC board can also be field replaced. Calibration factor and other specific information are maintained at the factory for all transmitters shipped.
| Transducer Components | |
| 1 | Spring Retainer |
| 2 | Spring |
| 3 | Clamp |
| 4 | Bushing |
| 5 | Drywell |
| 6 | Ultrasonic Transducer |
DP/DS PANEL METER/DISPLAY OPTION
Digital panel meter installed on transmitter
Power Supply: Loop Powered
Display: 4-1/2 Digit LED, 0.6"
Case: NEMA 4X
Versions: DP Option: Displays 0-100% F.S
DS Option: Scaled to customer requirement
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Panel Meter/Display option
Four or eight pin receptacle connector recommended. |
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ORDERING INFORMATION
ORDER NUMBER (ABCD)
Example: CSLFC10GB
| FOR YOUR CONVENIENCE, THESE ITEMS ARE AVAILABLE ONLINE OR PLEASE CALL 1-800-253-2497 TO ORDER | ||
| A | B | C |
| Model | Units of Measure | Transducer Seal |
| CSLFC3 | G= Gallons Per Minute (U.S.) | E = EPDM |
| CSLFC4 | L= Liters Per Minute | B = Buna-N |
| CSLFC6 | N= Neoprene® | |
| CSLFC8 | V= FKM | |
| CSLFC10 | ||
| Options | ||
| - = None | ||
| DF= Direction of flow output option, call factory at 1-800-253-2497 to order. | ||
| R=100 Ohm Platinum RTD | ||
| DP=Display % F.S | ||
| DS=Display in Engineering Units- specify | ||
| Transmitter Connector Option | ||
| - = 1/2" NPT | ||
| 4R= 4-Pin Male Circular Receptacle | ||
| 8R= 8-Pin Male Circular Receptacle | ||
| 4C= 4-Pin Female Circular Connector | ||
| 8C= 8-Pin Female Circular Connector | ||
| *For non-listed ranges specify model followed by full span value | ||
| Example: CSLFC4-150G = 150 GPM at 20 mA or CSLFC4-750L=750LPM @ 20 mA | ||
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ULTEM® is a registered trademark of The General Electric Company
Neoprene® is a registered trademark of DuPont Dow
Clark reserves the right to make design changes without prior notice.
| Ask about our remote mount series 1000 & 2000 flow rate indicators and totalizers |  |
