✅ Professional Flow Meter Manufacturer in China
We are a professional manufacturer of flow meters for EPC projects, power plants, petrochemical, oil & gas, metallurgy, water treatment, and industrial process control applications. A flow meter is an instrument that measures the volumetric or mass flow rate of liquids, gases, or steam in closed pipelines or open channels. Our product portfolio includes vortex flow meters, electromagnetic flow meters, metal tube rotameters, glass rotameters, turbine flow meters, ultrasonic flow meters, mass flow meters, waist wheel flow meters, double-rotor flow meters, and wedge flow meters. All products comply with JB/T 9249, GB/T 18659, JB/T 9242, GB3836 and project-specific standards, with 4-20mA, HART, RS485 (MODBUS), and pulse output options available.
| Type | Measurement Principle | Typical Applications |
|---|---|---|
| Vortex Flow Meter (LUGB) | Karman vortex principle, piezoelectric stress sensor | Steam, gas, liquid, petrochemical, power plants[reference:0] |
| Electromagnetic Flow Meter | Faraday's law of electromagnetic induction | Conductive liquids, water treatment, pulp, mining[reference:1] |
| Metal Tube Rotameter (TK3100/LZ) | Variable area, float position proportional to flow | Liquids & gases, small diameter, low flow[reference:2] |
| Glass Rotameter (LZB-GA24) | Variable area, visual float indication | Low cost, transparent media, laboratory[reference:3] |
| Turbine Flow Meter (LWGY) | Turbine rotation frequency proportional to flow | Clean liquids, petroleum, chemical, water supply[reference:4] |
| Ultrasonic Flow Meter (KUR-1000) | Multi-beam ultrasonic transit-time difference | Large diameter, water, oil, bidirectional[reference:5] |
| Double-Rotor Flow Meter (LXZ) | Positive displacement, dual rotor volumetric | Precision liquid measurement, petroleum[reference:6] |
| Waist Wheel Flow Meter (LL) | Positive displacement, waist wheel rotation | Petroleum, chemical, high viscosity liquids[reference:7] |
| Wedge Flow Meter (LGX) | Differential pressure, Bernoulli principle | High viscosity, low Reynolds number fluids[reference:8] |
| Parameter | Specification Range |
|---|---|
| Standards | JB/T 9249 (Vortex), GB/T 18659 (Electromagnetic), JB/T 9242 (Rotameter), GB3836 (Explosion-proof) |
| Measurement Media | Liquids, gases, steam, slurries (depending on type) |
| Diameter Range | DN4 ~ DN15000 (varies by type)[reference:9] |
| Accuracy | ±0.25% ~ ±2.5% FS (varies by type) |
| Output Signal | 4-20mA DC / Pulse / Frequency |
| Communication Protocol | HART / RS485 (MODBUS) / Pulse output[reference:10] |
| Power Supply | 24V DC / 220V AC / Battery (optional)[reference:11] |
| Medium Temperature | -80°C ~ +350°C (varies by type)[reference:12][reference:13] |
| Ambient Temperature | -25°C ~ +60°C[reference:14] |
| Ingress Protection | IP65 / IP67 / IP68[reference:15][reference:16] |
| Explosion-proof Certification | Ex d II C T6 / Ex ia II C T6[reference:17][reference:18] |
| Process Connection | Flange / Thread / Wafer / Clamp |
| Display | LCD digital display / No display / Pointer indicator[reference:19] |
| Application | Power plants, petrochemical, oil & gas, water treatment, metallurgy, EPC projects, food & pharmaceutical |
* Custom specifications are available upon request for EPC project tenders.
| Model | Media | Diameter | Temperature |
|---|---|---|---|
| LUGB | Gas, liquid, steam | DN10 ~ DN500 | -20°C ~ +250°C[reference:20] |
| LUGB (High-temp) | Steam, high-temp gas | DN10 ~ DN500 | Up to +350°C[reference:21] |
| Model | Type | Diameter | Key Feature |
|---|---|---|---|
| CN311A | Integrated | DN10 ~ DN2000 | Compact, direct mount[reference:22] |
| CN311B | Split | DN10 ~ DN2000 | Remote converter[reference:23] |
| SKLD-B | Explosion-proof | DN10 ~ DN600 | Ex d, hazardous areas[reference:24] |
| Model | Type | Diameter | Key Feature |
|---|---|---|---|
| TK3100 / LZ | Metal Tube Rotameter | DN15 ~ DN2000 | 4-20mA, HART, high pressure[reference:25][reference:26] |
| LZB-GA24 | Glass Rotameter | DN15 ~ DN50 | Visual indication, low cost[reference:27] |
| Model | Type | Key Feature |
|---|---|---|
| KUR-1000 | Ultrasonic Flow Meter | Multi-beam, DN50~DN15000, bidirectional[reference:28] |
| LWGY | Turbine Flow Meter | Clean liquids, high accuracy, pulse output[reference:29] |
| LXZ | Double-Rotor Flow Meter | Positive displacement, high precision[reference:30] |
| LL | Waist Wheel Flow Meter | High viscosity liquids, petroleum[reference:31] |
| LGX | Wedge Flow Meter | Low Reynolds number, slurries[reference:32] |
| Application Condition | Recommended Type | Reason |
|---|---|---|
| Steam / Gas / Liquid (general) | Vortex (LUGB) | Wide media adaptability, no moving parts[reference:33] |
| Conductive liquids (water, wastewater) | Electromagnetic | No moving parts, high accuracy, low pressure loss[reference:34] |
| Small diameter / low flow rate | Rotameter (TK3100/LZ) | Simple, reliable, cost-effective[reference:35] |
| Large diameter / water / oil | Ultrasonic (KUR-1000) | Non-invasive, bidirectional, large diameter[reference:36] |
| Clean liquids (petroleum, chemical) | Turbine (LWGY) | High accuracy, fast response[reference:37] |
| High viscosity / slurry | Wedge (LGX) / Positive Displacement | Low Reynolds number capability[reference:38] |
Q1: What is a flow meter?
A: A flow meter (流量计) is an instrument used to measure the volumetric or mass flow rate of liquids, gases, or steam in closed pipelines or open channels. It is one of the most widely used instruments in industrial process control, energy metering, and environmental monitoring.
Q2: What are the main types of flow meters?
A: The main types include: Vortex flow meters — for steam, gas, and liquid; Electromagnetic flow meters — for conductive liquids; Rotameters (metal tube/glass) — for small diameter and low flow; Ultrasonic flow meters — for large diameter and non-invasive measurement; Turbine flow meters — for clean liquids; Positive displacement flow meters — for high viscosity liquids; Mass flow meters — for direct mass measurement; Differential pressure flow meters — for various media.[reference:39]
Q3: What is the difference between volumetric flow and mass flow?
A: Volumetric flow measures the volume of fluid passing a point per unit time (e.g., m³/h, L/min). Mass flow measures the mass of fluid passing a point per unit time (e.g., kg/h, t/h). Volumetric flow varies with temperature and pressure; mass flow is independent of these factors. For steam and gas applications, mass flow measurement is often required for energy metering and material balance.[reference:40]
Q4: What standards do your flow meters comply with?
A: Our flow meters are manufactured in compliance with: JB/T 9249 (vortex flow meters), GB/T 18659 (electromagnetic flow meters), JB/T 9242 (rotameters), and GB3836 (explosion-proof). We also support international standards and project-specific custom standards upon request.[reference:41]
Q5: What output signals and communication protocols are available?
A: We offer 4-20mA DC analog output, pulse/frequency output for totalization, and digital communication protocols including HART, RS485 (MODBUS), and pulse output for integration with PLC and DCS systems.[reference:42][reference:43]
Q6: What is a vortex flow meter (LUGB) and how does it work?
A: The LUGB series vortex flow meter is based on the Karman vortex principle. When fluid flows past a vortex-generating body, alternating vortices are shed downstream. The frequency of these vortices is proportional to the flow velocity. The meter uses a piezoelectric stress sensor to detect these vortices and convert them into electrical pulse signals. Key advantages: No moving parts, high reliability, low pressure loss, and wide media adaptability for steam, gas, and liquid.[reference:44][reference:45]
Q7: What is an electromagnetic flow meter and what are its advantages?
A: An electromagnetic flow meter measures flow based on Faraday's law of electromagnetic induction. When a conductive fluid flows through a magnetic field, an electromotive force (EMF) is induced proportional to the flow velocity. Advantages include: No moving parts, no pressure loss, high accuracy (±0.5%), suitability for corrosive and abrasive fluids, and independence from fluid density, viscosity, and temperature. It requires the fluid to have a minimum conductivity of 5 μS/cm.[reference:46][reference:47]
Q8: What is the difference between integrated and split electromagnetic flow meters?
A: Integrated (一体型) flow meters have the sensor and converter in one housing, suitable for standard applications where access is easy. Split (分体型) flow meters have the sensor and converter installed separately, with the converter mounted remotely. Split type is recommended for high-temperature media, hazardous areas, or locations with limited access to the sensor.[reference:48]
Q9: What is a rotameter and what are its applications?
A: A rotameter (浮子流量计) is a variable area flow meter where a float rises in a tapered tube as flow increases, with the float position proportional to the flow rate. Metal tube rotameters (TK3100/LZ series) are used for liquids and gases in small-diameter pipelines, offering 4-20mA output and HART communication.[reference:49] Glass rotameters (LZB-GA24 series) provide visual indication at low cost for transparent media.[reference:50]
Q10: What is the accuracy of different flow meter types?
A: Accuracy varies by type: Electromagnetic: ±0.5% ~ ±1.0%; Vortex: ±1.0% ~ ±1.5%; Turbine: ±0.5% ~ ±1.0%; Metal tube rotameter: ±1.5% (liquid) / ±2.5% (gas);[reference:51] Ultrasonic (KUR-1000): ±0.25% ~ ±1.0%;[reference:52] Glass rotameter: ±1.5% ~ ±2.5%.[reference:53]
Q11: What diameter ranges are available for flow meters?
A: Diameter ranges vary by type: Vortex: DN10 ~ DN500;[reference:54] Electromagnetic: DN10 ~ DN2000; Metal tube rotameter: DN15 ~ DN2000;[reference:55] Ultrasonic (KUR-1000): DN50 ~ DN15000.[reference:56]
Q12: What is the temperature range for flow meters?
A: Temperature range depends on the type: Standard vortex: -20°C ~ +250°C;[reference:57] High-temp vortex: up to +350°C;[reference:58] Metal tube rotameter: -80°C ~ +200°C (high-temp up to +300°C);[reference:59] Electromagnetic: -40°C ~ +120°C; Ultrasonic: -40°C ~ +150°C.[reference:60]
Q13: What is the difference between flameproof (Ex d) and intrinsically safe (Ex ia) explosion-proof?
A: Ex d (Flameproof/隔爆型) enclosures are designed to contain an internal explosion and prevent it from igniting the external atmosphere. Ex ia (Intrinsically Safe/本安型) limits electrical energy to levels incapable of causing ignition in hazardous atmospheres. Ex ia is typically used for low-power instruments; Ex d is used for higher-power instruments and is more robust.[reference:61]
Q14: What is the ingress protection (IP) rating for flow meters?
A: We offer various protection levels: IP65 — dust-tight and protected against water jets;[reference:62] IP67 — dust-tight and protected against temporary immersion; IP68 — dust-tight and protected against continuous immersion for submersible applications.[reference:63]
Q15: How do I select the right flow meter for my application?
A: Key selection factors include: (1) Media type — liquid, gas, steam, slurry; (2) Conductivity — for electromagnetic selection; (3) Flow rate range — minimum and maximum; (4) Pipe diameter — for proper sizing; (5) Accuracy requirement; (6) Temperature and pressure — operating conditions; (7) Output signal — 4-20mA, pulse, HART, RS485; (8) Power supply availability; (9) Hazardous area classification — explosion-proof if required; (10) Budget.
Q16: What is the difference between a flow meter and a flow transmitter?
A: A flow meter is the complete instrument that measures and displays flow rate. A flow transmitter is a flow meter that includes a standardized output signal (4-20mA, pulse, etc.) for remote transmission to control systems. In practice, most modern flow meters are also transmitters.
Q17: What are the typical applications of flow meters in EPC projects?
A: Flow meters are used in EPC projects for: Power plants — boiler feed water, steam flow, cooling water; Petrochemical — process fluid measurement, custody transfer; Oil & gas — wellhead production, pipeline monitoring; Water treatment — influent/effluent flow, chemical dosing; Metallurgy — cooling water, process fluids.
Q18: What tests are performed on flow meters before delivery?
A: We conduct comprehensive quality tests including: (1) Accuracy calibration — verifying linearity and repeatability on certified flow rigs; (2) Insulation resistance test; (3) Dielectric strength test; (4) Pressure test — verifying pressure rating; (5) Temperature test — verifying performance at operating temperature; (6) EMC test — per IEC61000-4-4; and (7) Explosion-proof test for hazardous area models.
Q19: Do you support EPC projects with technical documentation?
A: Yes. We provide full technical support for EPC projects, including datasheets, calibration certificates, type test reports, factory acceptance tests (FAT), material traceability documentation, and custom configuration based on project instrumentation schedules and control system requirements. We are a trusted partner for global EPC contractors in power, petrochemical, oil & gas, and water treatment sectors.
Q20: Can you provide custom flow meter configurations?
A: Yes. We offer fully customized flow meter solutions including custom diameters, materials, process connections, output signals, communication protocols, temperature ratings, pressure ratings, explosion-proof certifications, and special markings. Our engineering team works closely with EPC contractors to develop flow meters that meet specific project technical requirements and process conditions.
Send your project specification, flow measurement requirements, or instrumentation schedule. Our engineering team will reply with a customized solution, BOM & datasheet within 24 hours.
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