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Nexisense MF5700 Series Gas Mass Flow Meter | MEMS Thermal Micro Gas Mass Flow Meter 0-250L/min RS485 Modbus Portable Gas Flow Sensor
Focus Section
Solving the challenges of precision metering and portable integration for micro and low-velocity gas flow, providing MEMS direct measurement and high-sensitivity mass flow solutions without compensation
The Nexisense MF5700 series gas mass flow meter is specially designed for low-velocity gas flow in small pipe diameters of 6~12mm. Using MEMS thermal mass sensing chips, it directly outputs mass flow, with ranges covering 0-20L/min (MF5706), 0-100L/min (MF5708), and 0-250L/min (MF5712). It features a repeatability of 0.5% and low pressure loss, making it particularly suitable for precision metering of common gases such as air, nitrogen, oxygen, argon, and carbon dioxide.
Three Core Selling Points:
MEMS High-Precision Micro-Flow Measurement: Based on the thermal mass principle, it requires no temperature or pressure compensation. It has high sensitivity and can start metering from an extremely small initial flow, with high stability and excellent repeatability across the full range. Display resolution is as low as 0.01L/min.
Low Power Consumption Portable & Dual Power Design: Power consumption is ≤10mW. It supports switching between 4 AA batteries or an external 6-15VDC power supply. The portable structure is lightweight (185g~350g), suitable for on-site sampling and laboratory use.
Easy IoT Integration Capability: Optional RS485 output (Modbus protocol) supports data querying by host computer; LCD displays instantaneous flow (SLPM) and cumulative flow (NCM). It features convenient button operation, password protection, totalizer reset, over-range alarm, etc., facilitating connection to PLC, SCADA, or industrial IoT systems.
Overview
The Nexisense MF5700 series gas mass flow meter (models include MF5706, MF5708, MF5712) is a thermal mass gas mass flow meter developed based on MEMS micro-electro-mechanical system sensing chips. This series is specially designed for metering low-velocity gas flow in gas pipelines with diameters of 6mm~12mm. The threaded interface supports easy conversion with various quick connectors to meet various gas pipeline needs.
Its core working principle is thermal mass flow metering: when the chip is in operation, a stable temperature field distribution is formed around the sensor; when gas flows, the flow disrupts this temperature field distribution, forming a specific temperature field change that depends on the gas mass and velocity. Integrated multi-sensors on the chip measure this change, which is then amplified, conditioned, and linearized by a dedicated circuit to directly obtain the gas mass flow or total flow. This design requires no temperature or pressure compensation, ensuring high-precision metering.
Product features are distinct: small size, light weight (185g~350g), low pressure loss (≤600Pa~2000Pa), response time ≤2s, and extremely low power consumption (≤10mW). The display uses an LCD, supporting dual display of instantaneous flow (SLPM, standard L/min) and cumulative flow (NCM, standard m³), with fine resolution. Functions include password setting, totalizer setting and reset, and totalizer alarm. Mechanical interfaces are NPT threads (1/4", 3/8", 1/2"), with a maximum working pressure of 0.8MPa and a working temperature of -10~55°C.
The Nexisense version strengthens industrial IoT integration while retaining the core MEMS advantages: optional RS485 communication interface (Modbus protocol) supports remote data querying by the host computer; the dual power supply design for battery and external power greatly improves portability and on-site flexibility. System integrators can easily integrate it into automated control systems to achieve real-time monitoring and data traceability of micro gas flow; engineering contractors can quickly deploy it in projects such as gas sampling, process control, gas analyzers, medical equipment, and laboratory calibration, ensuring efficient, reliable, and low-maintenance metering processes.
This series is widely applicable to air, compressed air, nitrogen, oxygen, argon, carbon dioxide, and other inert or common gases (please confirm specific gas compatibility), making it an ideal choice for low-flow micro-flow precision metering.
Main Advantages
The Nexisense MF5700 series gas mass flow meter has been optimized in terms of MEMS chips, power control, and integration, highlighting stability, high precision, anti-interference capability, and easy integration to meet the strict requirements of B2B projects for micro gas metering.
MEMS Thermal Mass Sensing Chip & Direct Measurement: Uses micro-electro-mechanical system (MEMS) chips to integrate multiple sensors on a single chip, achieving simultaneous heat generation and temperature measurement. It directly outputs high-quality mass flow without temperature and pressure compensation, ensuring high accuracy (±(2.0+0.5FS)%) and excellent repeatability (0.5%). High sensitivity allows accurate metering even for extremely small starting flows, with a turndown ratio of up to 80:1 or higher and strong stability across the full range.
Low Power Consumption & Portable Structure Design: Power consumption is only ≤10mW, supporting dual power supply by 4 AA batteries (LR6) or external 6-15VDC power with arbitrary switching. Pressure loss is extremely low (600Pa~2000Pa), with minimal impact on the piping system. The device is light and portable (185g~350g), suitable for handheld atmospheric sampling or rapid on-site detection, with a response time of ≤2s to meet real-time control needs.
Convenient Operation & Optimized Protection:
Clear LCD display supports instantaneous and cumulative flow, with a display resolution of 0.01L/min (standard) and intuitive button operation.
Rich functions: password protection, totalizer setting, reset, and over-range alarm indication.
Standardized mechanical interfaces (NPT threads) support quick connector conversion for flexible installation.
Strong adaptability to the working environment: temperature -10~55°C, maximum pressure 0.8MPa, standard calibration gas is air (20°C, 101.325kPa).
Anti-interference & Easy IoT Integration: Optional RS485 output (Modbus protocol) supports instantaneous/cumulative data querying by the host computer, achieving remote monitoring and automation integration. Digital signal processing provides strong anti-interference capability. The portable design combined with communication functions facilitates inclusion in industrial IoT platforms or laboratory management systems, reducing system integration costs.
These advantages make the Nexisense MF5700 series not just a micro-flow meter, but a smart metering device that can be flexibly deployed in portable and online scenarios, helping users improve micro gas process control accuracy and data reliability.
Technical Specifications
Main technical parameters of Nexisense MF5700 series gas mass flow meter:
| Item | MF5706 | MF5708 | MF5712 |
|---|---|---|---|
| Path | 6mm | 8mm | 12mm |
| Flow Range | 0~20 L/min | 0~100 L/min | 0~250 L/min |
| Accuracy | ±(2.0+0.5FS)% | ±(2.0+0.5FS)% | ±(2.0+0.5FS)% |
| Repeatability | 0.5% | 0.5% | 0.5% |
| Pressure Loss | ≤600 Pa | ≤2000 Pa | ≤2000 Pa |
| Response Time | ≤2 s | ≤2 s | ≤2 s |
| Power Consumption | ≤10 mW | ≤10 mW | ≤10 mW |
| Weight | 185 g | 350 g | 350 g |
| Mechanical Interface | NPT1/4" | NPT3/8" | NPT1/2" |
| Max Working Pressure | 0.8 MPa | 0.8 MPa | 0.8 MPa |
| Working Temperature | -10 ~ 55°C | -10 ~ 55°C | -10 ~ 55°C |
General Parameters
| Item | Specification Description |
|---|---|
| Working Principle | MEMS Thermal Mass Flow Metering (Thermal Diffusion Principle) |
| Power Supply | 4 AA batteries (LR6) or external 6-15VDC |
| Display Mode | LCD (Instantaneous Flow SLPM + Cumulative Flow NCM) |
| Display Resolution | 0.01 L/min (standard) / 0.1 L/min (standard) |
| Output Mode | RS485 (Modbus, optional) |
| Functions | Password setting, Totalizer setting/reset, Totalizer alarm |
| Std. Calibration Gas | Air (20°C, 101.325 kPa) |
| Other | Optional minUSB communication cable (USB-100) |
Application
Nexisense MF5700 series gas mass flow meter is suitable for various micro and low-velocity gas metering scenarios:
Laboratory & Gas Analysis: Precision measurement of air, nitrogen, oxygen, and other gas flows. Supports cumulative metering and data export, suitable for calibration, gas distribution, and analyzer integration.
Process Control & Gas Sampling: Low-velocity gas flow metering in atmospheric sampling and environmental monitoring. The portable battery-powered design facilitates field operations, and RS485 supports remote data collection.
Medical & Respiratory Equipment: Flow control of medical gases such as oxygen and air. Utilizing MEMS high sensitivity and low pressure loss characteristics ensures safety and precision.
Industrial Gas Delivery & Testing: Micro-flow monitoring of inert gases such as compressed air, argon, and carbon dioxide. Integrated into PLC systems for automated process control.
Energy & Environmental Monitoring: Low-velocity metering in small pipes for natural gas, biogas, etc. Supports totalizer alarm function to aid energy consumption management and leak detection.
R&D & Equipment Testing: Used as a portable metering tool for gas flow standard verification or equipment performance testing, with parameters configurable on-site.
Wiring and Installation
Installation and operation tips (see product manual for details):
The mechanical interface is NPT thread. Connect directly to pipes or quick connectors. Ensure the correct flow direction (positive gas flow).
Avoid severe vibration and strong electromagnetic interference sources during installation. The gas in the pipe should be clean and free of large amounts of condensed water.
Flexible power supply: insert 4 AA batteries or connect an external 6-15VDC adapter; optional minUSB communication cable for connecting to the host computer.
RS485 wiring (optional): Correctly connect A/B signal lines, configure Modbus address and baud rate, support host computer data querying.
Operation: Set parameters (instantaneous/cumulative units, totalizer reset, alarm thresholds, etc.) via panel buttons; LCD displays in real-time. Perform zero check before venting, slowly introduce gas and observe stability.
Maintenance: Regularly check battery power and interface seals. The MEMS chip has no moving parts, making daily maintenance simple.
For high temperature, high pressure, or special gas applications, please confirm compatibility in advance and consult technical support.
FAQ
Q1. What is the core advantage of Nexisense MF5700 series compared with traditional gas flow meters?
It adopts a MEMS thermal mass chip to directly measure mass flow without temperature and pressure compensation. It features high sensitivity, low power consumption, and strong portability, making it especially suitable for 6~12mm small pipe diameter micro-flow scenarios.
Q2. How to choose the range for different models?
MF5706 (0~20L/min, 6mm) is suitable for extremely small flows; MF5708 (0~100L/min, 8mm) is for medium flows; MF5712 (0~250L/min, 12mm) is suitable for larger flow requirements.
Q3. Does it support RS485 output? How to integrate it into a system?
It supports RS485 (Modbus protocol, optional), facilitating connection to PLC, host computer, or IoT platform for remote data querying and monitoring.
Q4. What are the power supply modes? How long does the battery last?
It supports dual power supply by 4 AA batteries or external 6-15VDC. Ultra-low power consumption (≤10mW) ensures long battery life, suitable for portable applications.
Q5. What gases is it applicable to? Can oxygen be measured?
It is mainly applicable to common gases such as air, nitrogen, oxygen, argon, and carbon dioxide (please confirm compatibility for specific gases; some MF5712 models are not recommended for oxygen).
Q6. How about pressure loss and response time? Is the impact on the pipeline large?
The pressure loss is low (600~2000Pa), and the response is ≤2s. The impact on process pipelines is minimal, suitable for precision control scenarios.
Q7. What are the display and operation functions?
The LCD displays instantaneous flow (SLPM) and cumulative flow (NCM). Buttons support parameter setting, totalizer reset, alarms, etc., with intuitive operation.
Q8. What are the installation and maintenance precautions?
Select appropriate NPT interfaces and ensure the gas is clean. Regularly check batteries and seals. The MEMS chip maintenance is simple and does not require frequent calibration.
Summary
The Nexisense MF5700 series gas mass flow meter takes MEMS thermal mass sensing technology as its core. With high-precision micro-flow measurement, low-power portable design, uncompensated direct output, and optional RS485/Modbus easy integration features, it provides a professional and flexible low-velocity gas metering solution for system integrators and engineering contractors. It effectively solves metering pain points in micro-flow scenarios, ensuring data accuracy, convenient operation, and system compatibility.
Whether in laboratory precision analysis or industrial field gas sampling and process control, the Nexisense MF5700 series can be your reliable metering partner.
Need specific model selection guidance, gas compatibility confirmation, Modbus communication protocol details, or project quotation support?
Welcome to contact the Nexisense technical team. We will provide customized recommendations and complete technical solutions based on your pipe diameter, flow range, gas type, power supply requirements, and integration method. Act now to make micro-flow gas metering more accurate, convenient, and intelligent.
