Flo-Instruments Co., Ltd
| Payment Terms | T/T |
| Delivery Time | 3-5 working days |
| Packaging Details | Conventional Packaging |
| Pipe Size | DN25-DN5000 |
| Liquid | Water, Sea water, Oil, Alcohol... |
| Pipe Material | PVC, Carbon Steel, Stainless Steel... |
| Velocity Range | 0.03 ~±40ft/s (0.01~±12m/s) |
| Repeatability | 0.15% |
| Power Supply | 24V DC |
| Transducers | Operating temperature: -40℉ ~ +176℉ (-40℃~+80℃) |
| Display | 20*2, alphanumeric, backlit LCD |
| Output | 4-20mA, OCT pulse output, relay output, RS-232 / RS-485, RTD temp. input |
| Transmitter Enclosure | IP65, die-cast aluminum machined enclosure, CNC machined |
| Linearity | 1.0% |
| Communication | RS485 |
| Keypad | 16 light tactile keys |
| Brand Name | Flo-Instru |
| Model Number | ST502 |
| Certification | CE; ISO9001 |
| Place of Origin | Shenzhen |
View Detail Information
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Product Specification
| Payment Terms | T/T | Delivery Time | 3-5 working days |
| Packaging Details | Conventional Packaging | Pipe Size | DN25-DN5000 |
| Liquid | Water, Sea water, Oil, Alcohol... | Pipe Material | PVC, Carbon Steel, Stainless Steel... |
| Velocity Range | 0.03 ~±40ft/s (0.01~±12m/s) | Repeatability | 0.15% |
| Power Supply | 24V DC | Transducers | Operating temperature: -40℉ ~ +176℉ (-40℃~+80℃) |
| Display | 20*2, alphanumeric, backlit LCD | Output | 4-20mA, OCT pulse output, relay output, RS-232 / RS-485, RTD temp. input |
| Transmitter Enclosure | IP65, die-cast aluminum machined enclosure, CNC machined | Linearity | 1.0% |
| Communication | RS485 | Keypad | 16 light tactile keys |
| Brand Name | Flo-Instru | Model Number | ST502 |
| Certification | CE; ISO9001 | Place of Origin | Shenzhen |
| High Light | ST502 insertion ultrasonic flowmeter ，ultrasonic transit time flowmeter ，pipe flow measurement flowmeter | ||
ST502 Insertion Type Ultrasonic Flowmeter
Ultrasonic flow meters that use transit-time methods to measure flow.
Introduction
The ST502 Insertion-Type Ultrasonic Flow Meter utilizes advanced digital signal processing technology to achieve ±0.5% high-accuracy flow measurement across a wide range of pipe sizes and clean liquid applications. Designed with a robust industrial-grade insertion probe, the ST502 provides strong ultrasonic coupling directly within the flow stream, ensuring excellent signal strength, long-term stability, and dependable performance.
A clear, intuitive user interface and menu system allow for easy configuration and operation. Unlike clamp-on models, the insertion design positions the ultrasonic transducers directly inside the pipe, enabling stronger signal penetration and enhanced stability—particularly beneficial for large-diameter pipelines, complex process conditions, or applications requiring highly reliable and repeatable measurements.
Engineered for versatility, the ST502 is ideal for water distribution systems, cooling loops, industrial process liquids, energy monitoring, and HVAC applications. Its combination of high accuracy, stable performance, and durable construction makes it a dependable solution for long-term flow monitoring and critical measurement tasks.
Benefits
ST502 is a brand-new high-end product that is made of aluminum alloy material and realizes CNC processing method. It adopts the industry-leading full-sealed iron-absorbing side-opening technology without any screw locking, and the tedious steps of screwing are reduced. Such a convenient design truly realizes "one-second opening".
Principle
The Transit-Time (TVT) Ultrasonic Flow Meter is a highly reliable flow measurement technology widely used for clean liguids. Unlike clamp-on designs, the insertion-type meter places the ultrasonic transducers directly into the pipe wall so they make contact with the fluid. This ensures strong ultrasonic transmission, excellent signal quality, and stable long-term performance, especially on large or thick-walled pipes.
In an insertion-type TVT flow meter, two ultrasonic transducers are inserted into the pipe wall. One transducer transmits a pulse downstream (T_down) with the direction of the fluid, while the other transmits upstream (T_up) against the flow. Because the flowing liquid accelerates the downstream signal and slows the upstream signal, the time difference (Δt=T_up - T_down) is proportional to the flow velocity.
Specifications
| Performance specifications | |
| Velocity range | 0.03 ~ ±40ft/s (0.01 ~ ±12m/s) |
| Accuracy | ±0.5% |
| Pipe size | 1’’~200’’ (25mm~5000mm) |
| Repeatability | 0.15% of measured value |
| Linerarity | ±1.0% |
| Fluid | Water, Sea water, Oil, Alcohol... |
| Pipe material | PVC, stainless steel, carbon steel, copper... |
| Function specifications | |
| Communication & Outputs | Communication: ModBus RS485 |
| Analog output: 4~20mA, max load 750Ω. | |
| Pulse output: 0~9999Hz, OCT, (min. and max. frequency is adjustable) | |
| Relay output: max 1Hz(1A@125V AC or 2A@30V DC) | |
| Flow Unit | Cubic Meters(m³), Liters(l), USA Gallons(gal). The factory default unit is m3/h. |
| Time Unit | /Day/Hour, /Min, /Sec. |
| SD Card | Max record: 2GB, working more than 1000 days |
| Storage time interval: 1~86400s | |
| Power supply | 24V DC/1A@ max |
| Keypad | 16 touch keys |
| Display | 20×2 lattice alphanumeric, back lit LCD. |
| Temperature | Transmitter: -40℉~140℉ (-40℃~60℃) |
| Transducer: -40℉~176℉ (-40℃~80℃) | |
| Humidity | Up to 99% RH, non-condensing |
| Physical specifications | |
| Transmitter | Die-cast aluminum, IP65, CNC machined |
| Transducer | Encapsulated design, protection grade IP68 |
| Transducer cable | Standard cable length: 33ft (10m). |
| Weight | Transmitter: 1kg |
Product Dimension
| Transmitter |
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| Transducer |
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Product Display
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Communication and Output Functions
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The ST502 Fixed Ultrasonic Flow Meter is equipped with multiple communication and output options to ensure seamless integration into various industrial control systems. These outputs enable real-time data acquisition, remote monitoring, and control of flow-related processes.
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Summary of Output Capabilities
| Output Type | Function | Application Examples |
| RS485(Modbus) | Digital communication | Remote monitoring, SCADA, system integration |
| 4-20mA |
Analog input Analog output |
PLC input, process feedback, DCS systems |
| OCT Pulse | Flow totalization output | Batch controllers, energy meters, flow loggers |
| Relay | Alarm/control output | Trigger alarmscontrol valves/pumps, flow safety protection |
Wiring Diagram & Installation Methods
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Company Details
Business Type:
Manufacturer
Ecer Certification：
Verified Supplier
Flo-Instruments has been specialized in the field of ultrasonic flow meters, and has over 20 years of relevant engineering and installation experience, covering clamp-on and insertion, wall-mounted and portable. We are keeping focusing on the development of industrial, commercial, and civilian ... Flo-Instruments has been specialized in the field of ultrasonic flow meters, and has over 20 years of relevant engineering and installation experience, covering clamp-on and insertion, wall-mounted and portable. We are keeping focusing on the development of industrial, commercial, and civilian ...
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