E&H 6F3B thermal mass flowmeter

E&H 6F3B thermal mass flowmeter

1. Product Overview

The Endress+Hauser Proline t-mass F 300 (order code root 6F3B) is a high-performance inline thermal mass flowmeter designed for the direct measurement of utility gases, process gases and gas mixtures in small line sizes. Built upon decades of thermal dispersion expertise, the t-mass F 300 series delivers uncompromised long-term stability and measurement reliability, making it the preferred choice for demanding industrial applications across chemical, oil & gas, food & beverage, pharmaceutical and energy sectors.-6-33

The patented sensor architecture of the t-mass F series provides unprecedented measurement stability in thermal inline mass flow measurement. It compensates in real time for changes in process conditions including temperature fluctuations, pressure variations, flow direction reversals and gas composition drift. The compact dual-compartment transmitter enclosure offers flexible operation and system integration with access from one side, remote display options, and enhanced connectivity pathways.-33

Each 6F3B-series flowmeter is engineered with Heartbeat Technology – an integrated verification and monitoring function that continuously validates measurement integrity, enabling compliant verification without process interruption.-33

Distributor: ST-YUKE CO., LIMITED – Authorized supplier of genuine Endress+Hauser instrumentation with global shipping and technical support.

2. Technical Specifications at a Glance

*Specifications derived from TI01500DEN_0323-00 Technical Information document.*-25-33-41

3. Seven Size Variants – Complete Lineup of the 6F3B Series

The 6F3B series spans seven distinct nominal diameter configurations, each engineered for specific flow capacity requirements. Below is a detailed breakdown of every available variant:

3.1 Model 6F3B15 – DN15 (½ inch)

The smallest variant in the series, 6F3B15 is optimized for low-flow applications requiring exceptional sensitivity. Its reduced bore diameter enables precise measurement of minimal gas flow rates, making it ideal for analytical instrumentation, pilot plants, pharmaceutical dosing and specialty gas blending. Typical measurable range: 0.5–45 kg/h depending on gas type.-25

3.2 Model 6F3B25 – DN25 (1 inch)

The 6F3B25 configuration serves as the workhorse for medium-flow industrial gas measurement. Particularly prominent in chemical processing environments, this variant delivers reliable performance across fluctuating process conditions with minimal susceptibility to gas composition variations. The 1-inch bore strikes an optimal balance between flow capacity and measurement resolution for most utility gas monitoring applications.-25-

3.3 Model 6F3B40 – DN40 (1½ inches)

Engineered for continuous, high-throughput gas flow monitoring, 6F3B40 excels in production line environments where stable, uninterrupted flow data acquisition is critical. This variant is frequently deployed in energy management systems, compressed air networks, and combustion air monitoring. Its larger bore diameter maintains low pressure drop while accommodating elevated flow velocities.-25-

3.4 Model 6F3B50 – DN50 (2 inches)

The 6F3B50 offers expanded flow capacity while retaining the series‘ signature measurement accuracy. This 2-inch variant is widely specified for natural gas distribution sub-metering, industrial boiler feed air monitoring, and nitrogen blanketing systems. A typical configured part number example: 6F3B50-AAIMADAFADSAAASGA2 is available through authorized distribution channels.-25-

3.5 Model 6F3B65 – DN65 (2½ inches)

Stepping into larger pipeline applications, 6F3B65 addresses high-flow measurement scenarios commonly encountered in large-scale chemical production lines and power generation facilities. This variant maintains stable operation under harsh conditions and delivers reliable data integrity even with aggressive or contaminated gas streams. Example configuration: 6F3B65-AAIBAEAFAASAD2SGA2+AK.-25-

3.6 Model 6F3B80 – DN80 (3 inches)

The 6F3B80 configuration extends the measurement envelope to 3-inch nominal diameter, accommodating substantial gas flow rates in main process headers and utility distribution networks. This variant is frequently specified for plant-wide compressed air monitoring, flare gas measurement, and large-scale HVAC airflow tracking. An example order code: 6F3B80-AAIBAEAFAASAAASGA2+AKCS.-25-

3.7 Model 6F3B1H – DN100 (4 inches)

At the top of the size range, 6F3B1H (DN100 / 4 inches) represents the maximum bore diameter available in the inline t-mass F 300 platform. This high-sensitivity variant is specifically designed for large-diameter gas flow applications where measurement precision must be maintained despite increased volumetric throughput. It is particularly well-suited for main natural gas intake lines, large-scale combustion air systems, and energy-intensive process gas monitoring.-25-24

4. Order Code Breakdown: 6F3B15-BBECAAAAAAHAABSKA2+AA

To facilitate precise device configuration and specification verification, each 6F3B-series flowmeter carries a comprehensive order code that encodes every built-in feature. The following analysis decodes the complete order code structure using the example 6F3B15-BBECAAAAAAHAABSKA2+AA:

Root Code: 6F3B15

6F3B = Proline t-mass F 300 series product family-10

15 = Nominal diameter DN15 (½ inch)

Feature Breakdown (Sequential positions after hyphen):

This order code breakdown follows the Endress+Hauser product configuration schema. For verification of any existing device or to build a custom configuration, the order code can be entered into the Endress+Hauser Device Viewer (www.endress.com/deviceviewer) to retrieve complete specification details.-49-10

Additional example order codes in the wild:

6F3B25-NDEBAAAFABSAD2SGA2+AKJA – DN25, flameproof enclosure, 4–20mA+HART, 0–10 Nm³/h range-

6F3B1H-AAIBAEAFAASAAASGA2+ – DN100, bidirectional sensor, SIL-capable configuration-

6F3B50-AAIBAEDFAASAD2SGA2+AA – DN50, extended diagnostics package-

5. Measuring Principle and Gas Engine Technology

The thermal mass flow measurement principle employed by the 6F3B series is based on the cooling effect of a flowing gas stream passing over a heated resistance thermometer (PT100). Two PT100 sensors reside within the flow stream: one serves as a temperature reference monitoring the actual process temperature, while the other is maintained at a constant differential temperature above the process temperature by controlled heating current. As gas mass flow increases, more heat is extracted from the heated sensor, requiring greater electrical current to maintain the temperature differential. This heating current is directly proportional to the mass flow rate.-41

The integrated Gas Engine software database, pre-loaded into every 6F3B unit, contains specific thermodynamic properties for 21 standard gases including air, nitrogen, oxygen, hydrogen, carbon dioxide, methane, propane, butane, argon, helium, and others. The Gas Engine enables:

Air-based factory calibration – eliminating expensive real-gas calibration requirements

Precise conversion from air to any target gas without recalibration

Dynamic pressure and temperature compensation during operation

Calculation of gas mixture properties based on up to 8 component percentages-41

6. Wetted Materials and Process Connections

The 6F3B series employs corrosion-resistant materials suitable for a wide range of industrial gas applications:

Process connection standards available:

EN flanges: DN15 to DN100, PN16/25/40

ASME flanges: ½ to 4 inches, Class 150/300

JIS flanges: 10K/20K

Threaded: NPT ½ to 4 inches; BSPT R½ to R4-33

7. Key Advantages and Differentiating Features

Heartbeat Technology – Integrated, non-intrusive verification of measurement integrity. The device continuously monitors its own health and can execute on-demand verification procedures without process interruption, generating compliant documentation for audit purposes.-33

Patented Drift-Free Sensor – Unlike conventional thermal mass sensors that experience baseline drift over time, the t-mass F sensor architecture maintains measurement stability throughout the device lifespan. This design carries SIL 2 functional safety certification.-33

Bidirectional Measurement – The 6F3B platform supports full bidirectional flow measurement with reverse flow detection, providing accurate totalization regardless of flow direction. Sensor version “SB” enables two-directional measurement while “SC” offers reverse flow detection with positive-direction totalization.-41

Freely Configurable I/O – Up to three input/output channels can be independently configured for 4–20mA HART, pulse/frequency outputs, status inputs, or fieldbus communication (Modbus RS485). This flexibility reduces SKU complexity and simplifies inventory management.-33

Remote Display Availability – For installations where the compact transmitter is not within convenient viewing range, an optional remote display kit (order code accessory A2 as seen in the example) provides front-panel access at a distance.-33

SIL 2 Capability – For safety-instrumented systems, the 6F3B series can be ordered with SIL 2 functional safety approval (option LA), meeting IEC 61508 requirements for low-demand and high-demand mode applications. The safety-related output signal includes configurable failure current thresholds (≤3.6 mA or ≥21 mA).-10

8. Installation and Operational Requirements

To ensure optimal measurement performance, the following installation guidelines should be observed:

Inlet/Outlet Straight Runs – For inline thermal mass flowmeters, a minimum of 5 × DN upstream straight pipe and 3 × DN downstream straight pipe is recommended, with longer runs (10 × DN) advised in the presence of bends, valves, or reducers.

Orientation – The 6F3B series can be installed in any orientation (horizontal, vertical, or inclined). However, the measuring tube must remain fully filled with the gas medium; condensation or liquid entrainment should be avoided as thermal mass measurement is calibrated for single-phase gas flow.

Environmental Conditions – The compact transmitter housing (IP66/67) is suitable for outdoor installation. The operating ambient temperature range is –40 °C to +60 °C (–40 °F to +140 °F).-

Electrical Connections – Standard M20 × 1.5 cable gland entries accommodate signal and power cabling. HART communication requires a minimum load resistance of 250 Ω between device and power supply. For Modbus RS485 variants, proper termination resistors and shielded twisted-pair cabling are required.

9. Supported Gases and Gas Mixtures

The Gas Engine database supports direct selection of the following 21 gases, with water vapor also available:

Ammonia (NH₃), Argon (Ar), Butane (C₄H₁₀), Chlorine (Cl₂), Hydrogen chloride (HCl), Ethane (C₂H₆), Ethylene (C₂H₄), Helium (He), Carbon dioxide (CO₂), Carbon monoxide (CO), Krypton (Kr), Air, Methane (CH₄), Neon (Ne), Ozone (O₃), Propane (C₃H₈), Oxygen (O₂), Hydrogen sulfide (H₂S), Nitrogen (N₂), Hydrogen (H₂), Xenon (Xe).-41

For custom gas mixtures not preloaded, the device can be configured using up to 8 individual gas components with user-defined percentage splits, with the Gas Engine calculating mixture properties dynamically during operation.

10. Why Source the 6F3B Series from ST-YUKE CO., LIMITED

ST-YUKE CO., LIMITED is a recognized distributor of Endress+Hauser instrumentation, providing the full Proline t-mass F 300 series (6F3B15, 6F3B25, 6F3B40, 6F3B50, 6F3B65, 6F3B80, 6F3B1H) with:

Genuine product certification – Every unit sourced directly from Endress+Hauser manufacturing facilities

Global shipping – Express delivery to major industrial centers worldwide

Technical pre-sales support – Order code configuration assistance and application engineering

Competitive pricing – Volume discounts available for OEMs and system integrators

Post-sales documentation – Full technical information packages (TI, BA, KA, GP) provided with each shipment

For inquiries, quotations, or technical consultation regarding any 6F3B-series model, contact ST-YUKE CO., LIMITED directly.

11. Downloads and Supporting Documentation

The following official Endress+Hauser documents provide complete technical information for the 6F3B series (available via www.endress.com or through ST-YUKE CO., LIMITED):

These documents contain the full technical data necessary for engineering, procurement, installation, and maintenance of the 6F3B series thermal mass flowmeters.