Clark Sonic® CSLFB 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 CSLFB 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 CSLFB 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 Brass body material.
Flow Range: Bi-directional, field selectable per "Standard Models" table Accuracy: ±.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: 250 PSI (17.2 bars) Pipe Sizes: 3/4", 1", 1 1/2", 2" Pipe Connections: Sizes 3/4" to 2"- Female NPT, BSP 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 or optional factory installed connectors Enclosure Rating: NEMA 4 (IP 65) Power: 18 to 36 VDC
Ultrasonic Transducers: ULTEM® Encapsulated Seals: EPDM, Buna-N, Neoprene™, FKM, or other Body Material: Brass (UNS C83600)
Analog: 2-wire, 4-20 mA output; Output is 4 mA from zero to min. flow (see Standard Model table) Additional Outputs: A second output is available in the form of an optically isolated NPN transistor. The second output is configured at the factory. The configuration choices are: 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. Frequency: Output is an optically isolated NPN transistor capable of sinking up to 25 mA from a voltage source of no more than 48 VDC. Frequency output is from 240 to 1200 pulses/gallon depending on range (see Standard Model table). Lower frequency can be provided on request. Direction of Flow: Optional output to indicate direction of flow is available. Activation or deactivation of an optically isolated 25 mA 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.
|3/4" & 1"||9.20||234||1.62||41.10||2.06||52.30||6.40||163||2.40||61.00|
|1-1/2" & 2"||9.88||251||2.75||69.90||2.51||63.80||6.40||163||2.40||61.00|
|Model||Pipe Size and Thread Size||*Field Selectable Full Scale Ranges (GPM)||*Field Selectable Full Scale Ranges (LPM)||Frequency Output Option||Flow Constant (Gallons)||Frequency Output Option||Flow Constant (Liters)|
|CSLFB34||3/4” NPT or BSP||L||0.23||15||0.90||60||1200||0.25||300||0.2|
|CSLFB10||1.0” NPT or BSP||L||0.45||30||1.70||115||600||0.1||150||0.4|
|CSLFB15||1.50” NPT or BSP||L||0.60||40||2.30||150||360||0.167||96||0.625|
|CSLFB20||2.0” NPT or BSP||L||0.90||60||3.40||225||240||0.25||60||1|
|*Other F.S. ranges can be specified|
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
GSP 312 installed and wired at factory
GDM3012 J Kit installed in field
4H-Hirschmann 1/2" NPTF Connector
4R/8R4C/8C4R/8R installed and wired at factory
4C/8C installed in field
|FOR YOUR CONVENIENCE, THESE ITEMS ARE AVAILABLE ONLINE OR PLEASE CALL 1-800-253-2497 TO ORDER|
|Model||Pipe Thread||Units of Measure||Transducer Seal|
|CSLFB34||NPT= Female NPT||G= Gallons Per Minute (U.S.)||E= EPDM|
|CSLFB10||BSP=Female British Standard Pipe (G)||L= Liters Per Minute||B= Buna-N|
|E - Options|
|NPN Transistor Output - Select One|
|- = Error Detection (Default)|
|F = Frequency Output|
|DF = Direction of flow output option|
|R=100 Ohm Platinum RTD|
|DP=Display % F.S|
|DS=Display in Engineering Units- specify|
|F - Transmitter Connector Options|
|- = 1/2” NPTF (Default)|
|4H=Hirschmann 4-conductor Receptacle & 1/2” NPTF Conduit Connector Set|
|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: CSLFB15-50G = 50 GPM at 20 mA or CSLFB15-200L=200LPM @ 20 mA|
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