YST Thermal Mass Gas Flow Meter YST306C1YD1

Overview

The YST Thermal Mass Gas Flow Meter YST306C1YD1 is an insertion-type thermal mass flowmeter engineered for continuous, real-time measurement of gas mass flow rate without the need for pressure or temperature compensation. Based on constant-temperature anemometry (CTA), it utilizes two platinum resistance temperature detectors (RTDs): one heated and one unheated. As gas flows across the sensor probe, convective heat transfer cools the heated element proportionally to mass flow velocity—enabling direct measurement of mass flow in standard cubic meters per hour (Nm³/h) or kg/h. Unlike volumetric flowmeters, this principle eliminates dependency on gas composition-dependent density corrections under varying pressure and temperature conditions, making it especially suitable for applications where gas composition remains stable but process conditions fluctuate—such as aeration control in wastewater treatment or inert gas purging in chemical processing.

Key Features

• Insertion-style probe design enables rapid field installation into existing ducts or pipes (DN50–DN1200 compatible via adjustable mounting flange), minimizing process downtime and eliminating the need for full-pipe replacement.
• Robust 304 stainless steel sensor body and probe construction ensures long-term structural integrity and corrosion resistance in humid, mildly aggressive industrial environments—including biogas, nitrogen, compressed air, natural gas, and flue gas streams.
• Dual-output configuration: isolated 4–20 mA analog output (HART-compatible wiring optional) for PLC/DCS integration, plus RS485 serial interface supporting Modbus RTU protocol for digital data logging, remote configuration, and firmware updates.
• Integrated backlit LCD display with Chinese-language UI provides local readout of instantaneous flow, accumulated total, and diagnostic status—supporting both commissioning verification and routine operational checks without external software.
• Factory-calibrated using traceable NIST-traceable gas standards (air, N₂) at multiple points across the 0–120 m/s velocity range; calibration certificates available upon request per ISO/IEC 17025 guidelines.

Sample Compatibility & Compliance

The YST306C1YD1 is validated for use with non-corrosive and mildly corrosive dry or saturated gases including air, nitrogen, oxygen, argon, carbon dioxide, natural gas (methane-rich), and biogas (up to 60% CH₄). It is not rated for use with explosive atmospheres (ATEX/IECEx), wet steam, or highly reactive gases (e.g., chlorine, ammonia, H₂S >50 ppm). While not certified to IEC 61508 SIL or ISO 13849 PL, its hardware architecture complies with EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU. For regulated industries, the device supports basic audit trail functionality via Modbus register logging and can be integrated into GLP/GMP-aligned workflows when paired with compliant SCADA systems that enforce user access control and change management protocols.

Software & Data Management

Configuration and diagnostics are performed via the optional YST-ConfigTool PC software (Windows-based), which connects via USB-to-RS485 adapter. The tool enables full parameter setup—including flow unit selection (Nm³/h, kg/h, SLPM), damping time adjustment (0.1–10 s), zero calibration initiation, and alarm threshold definition. All configuration changes are timestamped and stored in non-volatile memory. When connected to a Modbus master system, real-time flow data, temperature readings, and sensor health flags (e.g., “probe contamination warning”) are accessible via standard function codes (FC3, FC4). Raw data export (CSV) and trend visualization are supported through third-party SCADA platforms such as Ignition, Siemens Desigo, or Schneider EcoStruxure.

Applications

• Municipal Wastewater Treatment: Continuous monitoring of compressed air flow to fine-bubble diffusers in activated sludge basins—enabling dynamic DO control and energy optimization of blowers.
• Chemical & Petrochemical Processes: Inert gas (N₂, Ar) purge flow verification during reactor blanketing, catalyst regeneration, and pipeline pigging operations.
• Food & Beverage Packaging: Monitoring CO₂ or N₂ flow rates during modified atmosphere packaging (MAP) line validation and batch record generation.
• Biogas Upgrading Plants: Feed gas flow measurement upstream of membrane separation units to maintain optimal cross-flow velocity and recovery efficiency.
• Environmental Emission Monitoring: Supplementary flow input for CEMS (Continuous Emission Monitoring Systems) calculating mass emission rates (g/h) of NOₓ, SO₂, and particulates.

FAQ

Does the YST306C1YD1 require periodic recalibration?
Yes—annual field recalibration is recommended for critical applications. Zero calibration can be performed in situ with no flow; span calibration requires a certified flow standard or portable reference meter per ISO 16148.

Can the meter measure wet gas or condensing vapor?
No. Liquid droplets or condensate on the sensor probe will cause measurement drift and potential thermal shock damage. Install downstream of moisture separators and upstream of temperature drops below dew point.

Is the Chinese-language display configurable to English?
No—the firmware supports Chinese only. For English UI, contact YST support for firmware upgrade eligibility (subject to hardware revision).

What is the maximum allowable operating temperature of the probe?
The standard probe is rated for ambient pipe temperatures up to +80°C. High-temp variants (up to +150°C) are available under model suffix -HT; consult technical documentation prior to specification.

How does the device handle gas composition changes?
Thermal mass flowmeters assume fixed specific heat capacity (Cp). Significant shifts in gas composition (e.g., switching from air to pure CO₂) require reconfiguration of the Cp coefficient in firmware or application-level compensation using online gas analysis inputs.