1. Product Performance

1.1 Measurement Range and Adaptability

• Caliber and Flow Coverage: Suitable for pipe diameters φ10~φ2000mm, with flange connection calibers DN15~DN300 (special sizes customizable); flow range 0~770000Nm³/h (for φ2000mm air), normal flow range 0.5~14Nm³/h for DN10 and 5500~770000Nm³/h for DN2000, adapting to micro-flow to ultra-large flow scenarios.
• Medium and Working Condition Adaptability: Capable of measuring all gases except acetylene, including air, natural gas, carbon dioxide, biogas, argon, etc., compatible with dusty, sandy, and corrosive gases; medium temperature options: -30~200℃, -30~250℃, -30~350℃; working pressure ≤2MPa (standard), ≤10MPa (customized); ambient temperature -20~150℃.
• Flow Velocity Range: Lower range limit 0.5Nm/s, upper range limit 100Nm/s, turndown ratio up to 200:1, capable of accurately capturing low-velocity gas flow changes, meeting low-flow measurement needs such as leak detection.

1.2 Accuracy and Stability

• Measurement Accuracy: Reading accuracy ±1.5%, repeatability ±0.2%, warm-up time ≤15S, response time ≤100ms, enabling fast and accurate data collection, suitable for dynamic flow monitoring scenarios.
• Anti-Interference Ability: Complies with EMC electromagnetic compatibility standards (IEC61326-1, etc.) and CE certified, resistant to electromagnetic radiation and immunity interference; equipped with noise threshold adjustment (0-10 levels) and small-signal cutoff function (0.05%~range percentage), eliminating zero drift and noise interference.
• Operational Stability: Probe material is 1Cr18Ni9Ti, 304 stainless steel, or 316L, corrosion and wear resistant; transmitter housing is die-cast aluminum with IP65 protection rating, adapting to harsh industrial environments; sampling period adjustable from 200ms to 50S, with flexible flow display smoothness settings.

1.3 Structure and Protection Performance

• Structural Design: Supports insertion and in-line installation, optional split or integrated structure; insertion sensor probe outer diameter φ18mm, standardized flange connection dimensions (DN15 flange L=280mm, D=90mm), strong installation compatibility.
• Protection and Explosion-Proof: IP65 protection rating, cable outlet M20x1.5; explosion-proof type requires matching intrinsically safe explosion-proof certified safety barriers, suitable for flammable gas environments, with installation and wiring complying with explosion-proof standards.

1.4 Power Supply and Output Performance

• Power Supply: Supports DC20~30V (standard DC24V/1.5A) or AC85~265V (AC110V/220V) power supply, operating current DC<650mA, AC<100mA, allowing a certain degree of ripple and noise, adapting to conventional industrial power supply.
• Output Signals: 4~20mA analog output (load compatible), RS485 (baud rate 1200~19200) and RS232 (baud rate 9600) communication (Modbus RTU protocol); pulse/frequency output (pulse width 50~1000ms, maximum frequency 5000Hz), 2-channel relay alarm output (3A/250VAC, 3A/30VDC).

2. Core Selling Points

2.1 Direct Mass Flow Measurement Without Compensation

• Based on thermal diffusion principle, directly measures gas mass flow without temperature and pressure compensation devices, avoiding errors from indirect measurement; built-in medium density database (including 59 gases) with support for conversion coefficient correction, adapting to different gas measurement needs.
• Measurement is not affected by gas composition, pressure, or temperature changes, especially suitable for gases with fluctuating compositions such as natural gas and biogas, requiring no frequent calibration and reducing operating costs.

2.2 Wide Turndown Ratio + Multi-Scenario Adaptability for Strong Practicality

• Turndown ratio of 200:1, capable of accurately measuring low flow velocity (0.5Nm/s) to high flow velocity (100Nm/s), meeting both low-flow needs such as leak detection and aeration monitoring, and large-diameter industrial gas transmission metering.
• Flexible installation: Insertion type can be installed without stopping production, in-line type suitable for new pipelines; requires upstream straight pipe length ≥20DN and downstream ≥5DN, and orifice flow regulator can be installed when space is limited, reducing installation constraints.

2.3 Convenient Operation + Data Visualization for High Usability

• 16-character ×4-line LCD display, supporting Chinese/English switching, real-time display of instantaneous flow, cumulative flow, flow velocity, temperature, current output and other parameters; 5 display interfaces can be cycled through for intuitive data viewing.
• Simple key operation, supporting local parameter setting and RS485 remote configuration, including flow unit, range, alarm threshold, communication parameters, etc., with hierarchical password protection (setting password 1000, calibration password 0603) to prevent misoperation.

2.4 Rich Output + Data Traceability for Automation System Adaptation

• Supports three output methods: pulse, analog, and communication, directly connectable to PLC, DCS, flow totalizer and other devices; strong compatibility with Modbus RTU protocol, enabling remote reading of instantaneous/cumulative flow, device status and other data, and remote parameter modification.
• Equipped with historical data storage function, 64 historical data points traceable; cumulative flow supports reset and preset, with optional units such as g, Kg, Nm³, meeting metering traceability and cost accounting needs.

3. Main Functions

3.1 Accurate Flow Measurement and Accumulation

• Instantaneous Flow Measurement: Directly outputs gas mass flow with 9 optional units (g/min, Kg/h, Nm³/h, etc.); upper and lower range limits customizable, damping coefficient adjustable 0~50, balancing measurement response speed and display stability.
• Cumulative Flow Statistics: Automatically counts total cumulative flow, with cumulative unit changing with flow unit; supports separate reset or setting of integer and decimal parts, meeting batch metering and total statistics needs.
• Flow Velocity Monitoring: Real-time displays instantaneous flow velocity (unit Nm/s), with dynamic pipeline simulation of flow velocity, intuitively reflecting gas flow status for on-site observation.

3.2 Alarm and Output Control

• Dual Alarm Function: Supports upper and lower flow limit alarms, alarm values set by range percentage (0~100%), adjustable alarm hysteresis (e.g., 5.0%) to avoid frequent alarm switching; 2 relays correspond to upper and lower limit alarms respectively, linkable to external devices such as valves and alarms.
• Flexible Output Configuration: Pulse output equivalent optional 1.0~1000.0 units/pulse, maximum frequency output 5000Hz, suitable for flow counting and quantitative control; 4~20mA output can correspond to flow or flow velocity, supporting zero and full-scale calibration to ensure output accuracy.

3.3 Parameter Setting and Calibration

• Basic Parameter Setting: Configurable pipe inner diameter, medium type, gas density, conversion coefficient, etc.; instrument coefficient (1.0~adjustable) can compensate for flow velocity distribution interference, improving measurement accuracy; supports user zero calibration to solve non-zero display without flow.
• Current Calibration: Supports 4~20mA zero and full-scale calibration; fixed current output (4/8/12/16/20mA) can be selected for calibration to ensure analog output accuracy.
• System Setting: Configurable cycle display, backlight mode, buzzer on/off, historical data interval, etc.; supports parameter saving and restoration to avoid parameter loss due to misoperation.

3.4 Communication and Data Management

• Communication Function: RS485 interface supports device address setting 0~255, optional baud rate 1200~19200, configurable parity (none/odd/even); RS232 interface supports instrument program upgrade in addition to communication.
• Data Traceability: Historical data, cumulative flow, alarm records can be read through upper computer software; clear Modbus register addresses (e.g., instantaneous flow corresponds to 4x0001-4x0002), facilitating system integration and centralized data management.