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ST502 Flow Meter for Large Diameter Water Pipelines
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
Measures the actual flow and total consumption of various liquids
CNC machined process, magnetic open cover technology without any screws
Adaptive signal processing algorithms optimize performance, ensuring accurate measurements even in challenging flow conditions
Clear display interface and LCD display with alarm function, easy to operate and debug
Utilize transit-time ultrasonic technology to realize bidirectional flow measurement by precisely measuring the time it takes for ultrasonic signals to transmit upstream and downstream
Built-in 2G SD card and leverage storage capabilities to analyze historical flow data for system optimization
Built-in keypad and simple menu system for fast and easy option of pipe diameter, pipe material, liquid type, and measurement units
ST502 is a brand-new high-end product made of aluminum alloy material using CNC processing methods. It adopts industry-leading full-sealed iron-absorbing side-opening technology without any screw locking, reducing tedious steps of screwing. This 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 liquids. 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
Linearity
±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 adjustable) Relay output: max 1Hz (1A@125V AC or 2A@30V DC)
Flow Unit
Cubic Meters (m³), Liters (l), USA Gallons (gal). 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
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.
Summary of Output Capabilities
Output Type
Function
Application Examples
RS485 (Modbus)
Digital communication
Remote monitoring, SCADA, system integration
4-20mA
Analog input/output
PLC input, process feedback, DCS systems
OCT Pulse
Flow totalization output
Batch controllers, energy meters, flow loggers
Relay
Alarm/control output
Trigger alarms, control valves/pumps, flow safety protection
Wiring Diagram & Installation Methods
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
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 ...
