Flow Meter
Solving Stable Flow Measurement for Clean Liquids
The PTF 125 Pulse Output Intelligent Turbine Flowmeter is designed for accurate and repeatable flow measurement of clean liquids in industrial process control applications.
Based on the torque balance principle, the turbine sensor converts fluid kinetic energy directly into rotational motion, producing a high-frequency pulse signal proportional to flow rate.
With a simple mechanical structure, fast dynamic response, and multiple signal output options, PTF 125 is widely used in water, oil, and light hydrocarbon measurement where stability and signal reliability are critical.
Flow Meter Description
Turbine Type Flow Meter-Core Measurement Advantages
High measurement accuracy and repeatability
Torque-balanced turbine design ensures linear response within the calibrated flow range.
Sensitive response to flow changes
Ideal for process monitoring, batching, and totalizing applications.
Pulse output for control systems
Square-wave pulse signal suitable for PLC, DCS, counters, and data acquisition systems.
Multiple output options
Pulse, 4–20 mA, RS485, and HART protocols available.
Rugged industrial construction
Stainless steel body and wear-resistant impeller materials for long service life.
Flowmeter Turbine-Typical Applicable Media
PTF 125 is suitable for clean liquids compatible with stainless steel materials, including:
Water and demineralized water
Light oils and lubricants
Fuel oils and hydrocarbons
Other low-impurity industrial liquids
Note:
Free from fibers, particles, or solid impurities
Recommended viscosity ≤ 5 × 10⁻⁶ m²/s
Higher-viscosity liquids require calibration with the actual process fluid
Turbine Flowmeter-Working Principle
When the measured liquid flows through the turbine flow sensor, the impeller blades—mounted at a fixed angle to the flow direction—receive kinetic energy from the fluid.
As the impeller rotates, it reaches a stable speed once fluid driving torque, friction torque, and resistance torque are balanced. Under defined conditions, the rotational speed of the impeller is directly proportional to the average flow velocity inside the pipe.
Each rotation of the impeller periodically changes the magnetic field at the detection coil, generating an electrical pulse signal. After amplification and signal processing, the system outputs:
Pulse signal
4–20 mA analog signal
Instantaneous flow rate
Totalized flow
Within the calibrated flow range, the relationship between pulse frequency and flow rate is:
Within the calibrated flow range, the pulse frequency is directly proportional to the instantaneous flow rate:
Q = 3600 × F / K
Where:
Pulse Output Intelligent Turbine Flowmeter Design
The intelligent pulse output module enables direct signal transmission to control and monitoring systems:
Power Supply Options: +12 VDC or +24 VDC
Signal Type: Square-wave pulse
Transmission Distance: ≤ 300 m
Output Amplitude:
~10 V at +12 V supply
~20 V at +24 V supply
Red wire: Power supply positive
White wire: Pulse output
Black wire: Ground
The amplifier is directly mounted to the turbine sensor via M16 × 1.0 threaded connection, ensuring compact installation and reliable signal integrity.
Flow Meter Parameter
| Item | Specification |
|---|---|
| Model | PTF 125 |
| Nominal Diameter | DN6 ~ DN200 |
| Medium | Clean liquids (water, oil, etc.) |
| Viscosity Range | 5 ~ 400 mPa·s |
| Operating Temperature | -20 ~ 120 ℃ |
| Nominal Pressure | PN16 ~ PN63 |
| Flow Range | ≤ 1200 m³/h |
| Accuracy Class | 0.5 / 1.0 / 1.5 |
| Body Material | SS304 / SS321 / SS316L |
| Impeller Material | 2Cr13 / Duplex Stainless Steel |
| Ambient Temperature | -20 ~ 60 ℃ |
| Ambient Humidity | 5 ~ 90% RH |
| Signal Output | Pulse / 4–20 mA / RS485 / HART |
| Power Supply | 24 VDC ±15% |
| Battery Option | 3.6 V Li-battery 10 Ah (no signal output) |
| Explosion Proof | Ex dⅡBT4 |
| Protection Grade | IP65 |
| Electrical Interface | M20 × 1.5 |
| Process Connection | Flange or Thread |
| Installation | Horizontal |
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Related Product Recommendations
How does liquid viscosity affect turbine flow meter accuracy?
Turbine flow meters perform best with low to medium viscosity liquids. As viscosity increases, fluid drag on the impeller rises, which can reduce rotational speed and impact accuracy. For higher-viscosity media, calibration using the actual process fluid is recommended to maintain reliable measurement.
What is the relationship between pulse output and flow rate?
The pulse output frequency is directly proportional to the instantaneous flow rate. Each pulse represents a fixed volumetric increment defined by the meter factor (K-value), making pulse output ideal for batching, totalizing, and PLC-based control systems.
Can the pulse signal be transmitted over long distances?
Yes. Pulse output signals can typically be transmitted up to 300 meters, depending on wiring quality and electromagnetic environment. Proper grounding and shielded cables are recommended to ensure signal integrity in industrial installations.
Why is installation direction important for turbine flow meters?
Turbine flow meters must be installed in the correct flow direction and typically in horizontal pipelines. Incorrect orientation can affect impeller rotation stability, leading to inaccurate pulse output and reduced repeatability.
How do impurities or particles affect turbine flow meters?
Turbine flow meters require clean liquids without fibers or solid particles. Particulates may damage the impeller or interfere with rotation, causing signal fluctuation or long-term wear.
Is pulse output suitable for both flow measurement and totalization?
Yes. Pulse output is widely used for instantaneous flow measurement, total flow accumulation, batching control, and system verification, making it highly compatible with PLC, DCS, and industrial automation systems.
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