Ultrasonic Liquid Flow Transducer 3/4" to 3" CSLFB Series

The CSLF series ultrasonic liquid flow transducers are ideal for the 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, no moving parts, broad fluid compatibility, high accuracy and low cost.

At the heart of the 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 algorithum 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 transmitter 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.

Flow Range	Bi-directional, field selectable per table (Standard Models)
Accuracy	±0.75% of full scale
Operating Temperature	-40 to 80 ºC (-40 to 180 ºF)
Response Time	User selectable, 2 or 10 Seconds
Viscosity Range	0.2 to 150 sCt (0.2 to 150mPas)
Liquid Density	30.6 to 74.9 lb/cu.ft. (490 to 1200kg/m³)
Max. Working Pressure	200 PSI
Pipe Sizes	3/4", 1", 1.5", 2" & 3"
Pipe Connections	3/4" to 2" - Female NPT or BSP 3" - ASME class 150 or DIN 16 Flange
Electrical Enclosure	Intregal 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 (IP65)
Power Supply	18 to 36 Vdc
Ultrasonic Transducers	ULTEM® Encapsulated
Seals	EPDM, Buna-N, NeopreneTM, FKM or other
Body Material	Schedule 40, epoxy coated, carbon steel pipe
Output Signal	Analog, 2 wire, 4-20 mA; Output 4 mA from zero to min. flow (see Standard Mordel 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 anaomalies, as might be seen due to excessive bubble entertainment. The optional Fault output is an optically isolated NPN transistor capable of sinking up to 10 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 10 mA sink output indicates from direction. Error detection is not available when this option is ordered.

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