FS935 Clamp-on Ultrasonic Flow Meter
Summary:
The clamp-on ultrasonic flow meter is specifically designed for the pure water and softened water industries and can fully replace rotameters and float-type flow meters. It employs the latest time-of-flight ultrasonic measurement principle, utilizing a through-beam ultrasonic signal configuration on the measured pipeline, which delivers high signal strength and excellent stability. With no moving parts whatsoever, it eliminates wear and jamming, requiring virtually no maintenance.
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The clamp-on ultrasonic flow meter is specifically designed for the pure water and softened water industries and can fully replace rotameters and float-type flow meters. It employs the latest time-of-flight ultrasonic measurement principle, utilizing a through-beam ultrasonic signal configuration on the measured pipeline, which delivers high signal strength and excellent stability. With no moving parts whatsoever, it eliminates wear and jamming, requiring virtually no maintenance.
Detailed introduction
Product Features
- The FS935 series ultrasonic flow meters offer high customization and are suitable for special applications such as corrosion-resistant environments and high-temperature conditions.
- The product is standardly equipped with RS485 and 4–20 mA analog signal outputs, enabling remote monitoring and data transmission of the instrument. In addition, it features digital switch signal outputs that support upper- and lower-limit flow alarms.
- The clamp-on ultrasonic flow meter employs the time-difference method for measurement, enabling installation in just four simple steps without the need to cut or disrupt the pipeline. The measurement process is non-contact, requiring no contact with the fluid medium and no shutdown of operations.
- A temperature display has been added based on the FS930.
Technical Specifications
| Product Name | FS935 Clamp-on Ultrasonic Flow Meter |
| Accuracy | ±2.0% (±0.5 m/s to 5.0 m/s) |
| Repeatability | 0.8% |
| Data Storage | Instantaneous flow rate, instantaneous flow velocity, net cumulative volume, single-event cumulative volume, daily maximum, daily minimum, and hourly/daily/weekly/annual cumulative volumes |
| Response time | 50ms |
| Analog Output | 4–20 mA, maximum load 600 Ω |
| Alarm Output | OCT output, high/low flow rate, and cumulative pulse output |
| Communication Interface | RS485, supports the Modbus communication protocol |
| Power supply | 24 VDC @ 200 mA |
| Cable length | Standard length: 2.0 meters; can be extended up to 20 meters. |
| Press the key | Four touch buttons |
| Display screen | 2.4-inch 320×240 IPS LCD with four-way rotation (for easy reading) |
| Unit of measurement | Supports selection of metric and imperial units: m³/h, LPM, ml/min, GPM, LPH; the factory default unit is m³/h. |
| Accumulator | 7-digit display |
| Suitable medium | Water, seawater, oil, chemicals, etc. |
| Suitable for piping | Carbon steel pipes, stainless steel pipes, plastic pipes, brass pipes, and more. |
| Housing material | Aluminum alloy |
| Ambient temperature | -10℃ to -50℃ |
| Medium temperature | -10℃ to 50℃ |
| Environmental humidity | 0–95% relative humidity, non-condensing |
| Protection Level | IP54 |
Industry Applications
| New energy and liquid cooling fields | Device Traffic Monitoring | Water Industry Management | Cleaning equipment accessories |
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Pipe Size and Measurement Range
| Pipe outer diameter mm | φ9.53 | φ12.7 | φ15 | φ20 | φ25 | φ32 | φ40 | φ50 | |
| Nominal diameter DN | DN6 | DN8 | DN10 | DN15 | DN20 | DN25 | DN32 | DN40 | |
| Commonly referred to as NPS | 1/8 inch | 1/4 inch | 3/8 inch | 1/2 inch | 3/4 inch | 1 inch | 1.2 inches | 1.5 inches | |
| Minimum outer diameter mm | 9.5 | 12.4 | 14.5 | 16.5 | 25 | 32 | 38 | 48 | |
| Maximum outer diameter mm | 10.4 | 13.1 | 15.4 | 23 | 30 | 35 | 45 | 54 | |
| Traffic L/min | smallest | 0.34 | 0.60 | 0.86 | 1.06 | 1.88 | 2.94 | 4.82 | 7.54 |
| Maximum | 11.02 | 19.59 | 27.80 | 52.99 | 94.20 | 147 | 241 | 377 | |
| Traffic cubic meters per hour | smallest | 0.02 | 0.04 | 0.05 | 0.06 | 0.11 | 0.18 | 0.29 | 0.45 |
| Maximum | 0.66 | 1.18 | 1.67 | 3.18 | 5.65 | 8.83 | 14.47 | 22.61 | |
| Pipe outer diameter mm | φ63 | φ75 | φ90 | φ110 | φ140 | φ160 | φ220 | ||
| Nominal diameter DN | DN50 | DN65 | DN80 | DN100 | DN125 | DN150 | DN200 | ||
| Commonly referred to as NPS | 2 inches | 2.5 inches | 3 inches | 4 inches | 5 inches | 6 inches | 8 inches | ||
| Minimum outer diameter mm | 58 | 72 | 86 | 108 | 132 | 158 | 218 | ||
| Maximum outer diameter mm | 64 | 78 | 92 | 116 | 142 | 168 | 228 | ||
| Traffic L/min | smallest | 11.78 | 19.90 | 30.14 | 47.10 | 73.59 | 105.98 | 188.40 | |
| Maximum | 589 | 995 | 1,507 | 2,355 | 3,680 | 5,299 | 9,420 | ||
| Traffic cubic meters per hour | smallest | 0.71 | 1.19 | 1.81 | 2.83 | 4.42 | 6.36 | 11.30 | |
| Maximum | 35.33 | 59.70 | 90.43 | 141.30 | 220.78 | 317.93 | 565.20 | ||
Installation Method
Step 1 Ensure that the pipe surface is free of dust, paint, or any other contaminants; if the metal pipe surface is rough, it must be polished to a smooth finish using appropriate tools. Then place the lower clamp on the side of the pipe. | Step 2 Align the upper clamp with the lower clamp position; the upper and lower clamps will automatically snap together (due to built-in magnets). Then tighten the top screw until the upper and lower clamps securely grip the pipe. | Step 3 Take out the flow meter and remove the protective film from the sensor’s coupling pad. | Step Four Insert the flowmeter into the upper clamp, then tighten the screws at both ends to complete the installation. | Step 5 Take out the connection cable, screw the plug end into the flowmeter’s socket—ensure the correct orientation for easy insertion (the cable’s outgoing direction should align with the downstream direction)—and tighten it securely. Then connect the cable to a DC power supply, and the flowmeter will begin measurement. |
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Applicable Medium
The product virtually meets the requirements for measuring various single, clean liquids:
Its primary applications are in the measurement and control of water—ranging from tap water to ultrapure water. With the continued expansion of its use across various industries, it has also proven highly effective for a wide range of acids, bases, organic liquids, chemical solvents, alcohol, and beverage waters.
| Water | Chemical substances | Organic liquid | Oil products |
Pipeline materials
Metal pipes
| Stainless steel pipes | Carbon nanotubes | Copper pipes |
Plastic pipes
| PVCF | PVC/CPVC | PPR |
| PPH | PFA/PU | High-Density Polyethylene |
Note: Please consult us for additional pipe materials that can be tested; we offer free trial testing for materials that have not yet been tested.
Select Parameters
| Specifications | Outer diameter range (mm) | Nominal Pipe Diameter (Metric) | Nominal Pipe Diameter (Imperial) | Flow range | Flow range |
| -φ9.53 | 9.53–12.7 | DN6 | 1/8 inch | 0.2-20 | 0.012-1.2 |
| -φ12.7 | 12.7–14 | DN8 | 1/4 inch | 0.44-30 | 0.026–1.8 |
| -φ15 | 14-17 | DN10 | 3/8 inch | 0.57-50 | 0.034-3 |
| -φ20 | 17-20 | DN15 | 1/2 inch | 0.92-70 | 0.055-4.2 |
| -φ25 | 22-30 | DN20 | 3/4 inch | 1.36-150 | 0.082-9 |
| -φ32 | 30-35 | DN25 | 1 inch | 2.71-200 | 0.163-12 |
| -φ40 | 38-45 | DN32 | 1.2 inches | 4.24-330 | 0.254-19.8 |
| -φ50 | 48-54 | DN40 | 1.5 inches | 6.8-460 | 0.408-27.6 |
| -φ63 | 58-68 | DN50 | 2 inches | 9.54-700 | 0.572-42 |
| -φ75 | 68-78 | DN65 | 2.5 inches | 14.8-1030 | 0.888 - 61.8 |
| -φ90 | 88-96 | DN80 | 3 inches | 21.8-1360 | 1.308-81.6 |
| -φ110 | 108-116 | DN100 | 4 inches | 36.5-2170 | 2.19-130.2 |
Customizable corrosion-resistant enclosure for special environments
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