The red line in the chart above demonstrates the fast
response time of a 1-1/2" pipe size model UTLFB to
changes in flow. It is an ideal transmitter for control
feedback loop applications.
Clark UTLFB Ultrasonic Flowmeters 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. Model UTLFB has no moving parts.
At the heart of Series UTLFB 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. Then, 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 model UTLF 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.
GENERAL Flow Range: Bi-directional, field selectable per "Standard Models" table Accuracy: ±1.0% of reading Operating Temperature: -40 to 150°F Response Time: User Selectable, 2 or 10 seconds Viscosity Range: 0.2 to 150 mPas (0.2 to 150 cSt) Liquid Density: 490 to 1200 kg/m3 (30.6 to 74.9 lb/cu.ft.) Max. Working Pressure: 200 PSI Pipe Sizes: 3/4", 1", 1 1/2", 2", 3" Pipe Connections: Sizes 3/4" to 2"- Female NPT, BSP Size 3": ASME 150 or DIN 16 Flange Electrical Enclosure: Integral to Body casting with gasketed cover and M16 x 1.5 strain relief fitting for 5-8 mm outside diameter cable Electrical Connections: Screw terminal connections on PC board Enclosure Rating NEMA 4 (IP 65) Power: 15 to 32 VDC WETTED MATERIALSUltrasonic Transducers: ULTEM® Encapsulated Seals: Buna-N, Neoprene™, FKM, or other Body Material: Brass (UNS C83600) OUTPUT Analog: 2-wire, 4-20 mA output, 600 ohm max ; Output is 4 mA from zero to min. flow (see Standard Model table) Error Detection: An optically isolated 25 mA (max. 48V no load voltage) 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. 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.
| Meter Size | A | B | C | D | E | |||||
| Inches | mm | Inches | mm | Inches | mm | Inches | mm | Inches | mm | |
| 3/4" & 1" | 9.0 | 229 | 1.62 | 41.1 | 2.0 | 50.8 | 6.4 | 163 | 2.4 | 61 |
| 1-1/2" & 2" | 9.7 | 246 | 2.75 | 69.9 | 2.7 | 68.6 | 6.4 | 163 | 2.4 | 61 |
| Meter Size | A | B | C | D | E | |||||
| Inches | mm | Inches | mm | Inches | mm | Inches | mm | Inches | mm | |
| ASME 150 | 11 | - | ∅ 7.5 | - | 3.3 | - | 6.4 | - | 2.4 | - |
| DIN 16 | - | 280 | - | 190 | - | 84 | - | 163 | - | 61 |
| Model | Pipe Size/Thread Size | *Field Selectable F.S. Ranges (GPM) | *Field Selectable F.S. Ranges (LPM) | ||
| Min. | Max. | Min. | Max. | ||
| UTLFB34 | 3/4" NPT or BSP | 0.18 | 15 | 0.72 | 60 |
| 0.31 | 25 | 1.20 | 100 | ||
| UTLFB10 | 1.0" NPT or BSP | 0.38 | 30 | 1.38 | 115 |
| 0.63 | 50 | 2.40 | 200 | ||
| UTLFB15 | 1.50" NPT or BSP | 0.50 | 40 | 1.80 | 150 |
| 1.00 | 80 | 3.60 | 300 | ||
| UTLFB20 | 2.0" NPT or BSP | 0.75 | 60 | 2.70 | 225 |
| 1.88 | 150 | 6.90 | 575 | ||
| UTLFB30 | 3" ASME Class 150 Flange 80 mm DIN Class 150 Flange |
2.48 | 200 | 9.00 | 750 |
| 4.96 | 400 | 18.00 | 1500 | ||
|
*Other F.S. ranges can be specified |
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| A=Model | B=Pipe Thread | C=Units of Measure | D=Transducer Seal |
| UTLFB34 | 3/4" to 2" | G= Gallons Per Minute (U.S.) | B= Buna-N |
| UTLFB10 | NPT= Female NPT | L= Liters Per Minute | N= Neoprene® |
| UTLFB15 | BSP=Female British Standard Pipe (G) | V= FKM | |
| UTLFB20 | 3" | ||
| UTLFB30 | ASME= ASME Class 150 Flange | ||
| DIN= DIN Class 16 Flange | |||
| Options | |||
| DF= Direction of flow output option | |||
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*For non-listed ranges specify model followed by full span value Example: UTLFB15-50G = 50 GPM at 20 mA or UTLFB15-200L=200LPM @ 20 mA |
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