OMEGA FL-3840ST Gas Glass Housing Flow Meter 150MM

( Brand: Omega ), ( Manufacturer Part Number: FL-3840ST ), ( Part Type: Housing ), ( Country Of Origin: United States )

Review OMEGA Gas Flow Meter 150mm Used Glass In Housing

The **Omega FL-3840ST Gas Flow Meter with 150mm Glass Housing** is a high-performance, precision-engineered instrument designed for accurate and reliable measurement of gas flow rates in a wide range of industrial, laboratory, and commercial applications. Built with Omega s signature durability and engineering excellence, this flow meter combines advanced thermal dispersion technology with a robust, transparent 150mm glass housing to provide both operational visibility and exceptional performance. The glass housing not only allows for easy visual inspection of internal components such as the sensor probe and flow path ensuring maintenance and calibration can be performed with confidence, but also enhances safety by enabling quick identification of any potential blockages or obstructions within the system. Ideal for applications requiring precise flow control, such as HVAC systems, laboratory gas delivery, medical oxygen monitoring, or industrial process automation, this flow meter operates seamlessly with a wide variety of gases, including air, nitrogen, oxygen, and natural gas, making it a versatile solution for diverse environments.

The FL-3840ST features Omega s proprietary **thermal dispersion technology**, which ensures accurate flow measurement across a broad range of flow rates, from low laminar flows to high turbulent conditions, without the need for pressure drop or obstructions in the flow path. This non-intrusive measurement method eliminates the risk of clogging or damage to the sensor, while its self-cleaning design reduces maintenance requirements, making it particularly suitable for applications where cleanliness and reliability are critical. The flow meter s digital display provides real-time, high-resolution readings with adjustable units (e.g., SCFM, SLPM, m /h) and configurable parameters, including flow rate, totalized volume, and alarm thresholds, allowing operators to customize settings to match specific application needs. Additionally, the unit supports **RS-232 or RS-485 communication protocols**, enabling seamless integration with PLCs, data loggers, or SCADA systems for automated monitoring and control.

Constructed from high-quality materials, the FL-3840ST is built to withstand harsh industrial conditions, featuring a **stainless steel body** for corrosion resistance and a robust mounting flange system that accommodates various pipe sizes for easy installation. The 150mm glass housing is reinforced with a durable polycarbonate or tempered glass option, depending on the specific model variant, ensuring both clarity and structural integrity while maintaining pressure ratings up to **100 psi (6.9 bar)**. The flow meter s compact yet sturdy design allows for flexible installation in tight spaces, whether inline or as a standalone unit, while its wide temperature range (from **-20 C to 80 C**) ensures reliable operation in both controlled laboratory settings and demanding field applications. With its combination of precision engineering, user-friendly interface, and adaptability to diverse gas types, the Omega FL-3840ST stands as a dependable choice for professionals seeking accurate, maintenance-friendly flow measurement solutions.

The **Omega FL-3840ST Gas Flow Meter** with a **150mm glass housing** is a thermal dispersion flow meter designed for measuring gas flow rates in various industrial applications. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High Accuracy and Precision**

The FL-3840ST uses thermal dispersion technology, which provides accurate flow measurement across a wide range of gas types and flow rates. It is suitable for both laminar and turbulent flows, reducing calibration errors compared to mechanical meters.

2. **Wide Range of Applications**

It is designed for measuring a variety of gases, including air, nitrogen, oxygen, natural gas, and other clean or slightly contaminated gases. The 150mm glass housing makes it suitable for larger pipelines, accommodating higher flow rates than smaller models.

3. **Durable and Long-Lasting**

The glass housing is resistant to corrosion and chemical degradation, making it ideal for harsh environments. Omega s reputation for quality ensures reliable performance over extended periods with minimal maintenance.

4. **Digital Output and Integration**

The meter provides digital signals (e.g., 4-20mA, pulse, or digital communication protocols like HART or Modbus) for easy integration with PLCs, SCADA systems, or data loggers. This enhances automation and monitoring capabilities.

5. **Low Pressure Drop**

Unlike orifice plates or venturi meters, thermal dispersion meters introduce minimal pressure loss, making them energy-efficient for continuous operation.

6. **No Moving Parts**

The absence of moving components reduces wear and tear, lowering the risk of mechanical failure and maintenance downtime.

7. **Temperature and Pressure Compensation**

The FL-3840ST can compensate for temperature and pressure variations, ensuring accurate flow measurement even in fluctuating conditions.

8. **User-Friendly Interface**

The display is intuitive, allowing for easy setup, calibration, and monitoring of flow rates, totalization, and other parameters.

9. **Compliance with Industry Standards**

Omega products are often compliant with standards such as ISO, ANSI, or local regulatory requirements, ensuring reliability in certified applications.

10. **Versatile Mounting Options**

The meter can be installed inline or inserted into existing pipelines, offering flexibility in retrofitting or new installations.

---

### **Cons**

1. **Limited to Clean or Low-Particulate Gases**

While it performs well with clean gases, the FL-3840ST may not be suitable for highly contaminated or particulate-laden gases without proper filtration or additional conditioning. Solid particles or liquids can clog the sensor or affect accuracy.

2. **Higher Initial Cost**

Compared to simpler mechanical meters (e.g., turbine or rotameters), thermal dispersion meters like the FL-3840ST have a higher upfront cost. However, this is often justified by long-term accuracy and reliability.

3. **Calibration Requirements**

Like all flow meters, the FL-3840ST requires periodic calibration to maintain accuracy, especially if used in environments with significant temperature or pressure swings. Calibration may incur additional costs and downtime.

4. **Sensitivity to Sensor Fouling**

Over time, deposits or condensation on the sensor can degrade performance. Regular cleaning or maintenance is necessary to prevent drift in readings.

5. **Limited Flow Range for Very Low or High Flows**

While the 150mm housing extends the upper flow range, very low flows may still challenge the meter s sensitivity. For extremely low flows, a different model or additional instrumentation may be needed.

6. **Power Dependency**

The meter requires an external power source (e.g., 24V DC), which may not be available in all installations. Battery-backed models or backup power solutions may be required for remote or uninterruptible operation.

7. **Potential for Signal Noise**

In noisy electrical environments, the digital signals (e.g., 4-20mA) may be susceptible to interference, requiring proper shielding or grounding.

8. **Glass Housing Limitations**

While durable, the glass housing is more fragile than metal housings and may require additional protection in rugged or high-vibration environments.

9. **Limited Support for Condensable Gases**

If the gas contains condensables (e.g., water vapor in steam applications), condensation on the sensor can affect readings unless the meter is equipped with heating or drying features.

10. **Vendor Dependency for Spare Parts**

Omega is a reputable brand, but reliance on their support for spare parts or repairs may be a drawback in regions with limited local service providers.

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### **Conclusion**

The **Omega FL-3840ST Gas Flow Meter with 150mm glass housing** is a robust, accurate, and versatile tool for measuring gas flow in industrial applications where clean or slightly contaminated gases are involved. Its thermal dispersion technology, digital outputs, and low maintenance requirements make it a strong choice for applications requiring high precision and integration with automation systems. However, its higher cost, sensitivity to contamination, and calibration needs must be carefully considered, especially in harsh or low-flow environments.

For users prioritizing **accuracy, durability, and ease of integration**, this meter is an excellent investment. For applications with **highly contaminated gases, extremely low flows, or budget constraints**, alternative meters (e.g., turbine meters, ultrasonic meters, or orifice plates) may be more suitable.

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### **Recommendation**

- You need a high-accuracy, low-maintenance flow meter for clean or slightly contaminated gases.

- Your application requires digital integration with PLCs or SCADA systems.

- The 150mm housing aligns with your pipeline size and flow rate requirements.

- You can justify the initial cost with long-term reliability and reduced calibration downtime.

- Your environment is relatively stable in terms of temperature, pressure, and contamination.

- Your gas contains significant particulates, liquids, or condensables without proper conditioning.

- Your budget is limited, and you can tolerate slightly lower accuracy with a simpler meter.

- You operate in extremely low-flow conditions where the FL-3840ST may lack sensitivity.

- Your installation lacks power or requires rugged, metal-housed meters for harsh conditions.

For most industrial applications where accuracy and digital output are critical, the **FL-3840ST is a reliable and recommended choice**. Pair it with proper filtration, calibration protocols, and environmental controls to maximize its performance.

Details:

There is no paperwork for this item, you get what see - unknown prior gas used with it. Flow Meter, USED.

part #: fl3840st price

• $49.95

specifications pneumativalv:

• brand: Omega
• mpn: Fl-3840st
• part type: Housing
• country of origin: United States

returns pneumativalv:

• time: 30 Days
• policy: Returns Accepted
• paid by: Buyer
• method: Money back

payments pneumativalv:

• other
• credit card: Diners-club
• wallet: Paypal

offer pneumativalv:

• started: March 9, 2026
• quantity: 1
• options: Ship-to-home
• availability: In Stock
• sold: 0

seller pneumativalv:

• city: Shelburne Falls, Massachusetts
• # reviews: 7448
• rating: 100.0%

general pneumativalv:

• condition: Used
• Pump Flow Controllers > Flow Controllers Meters > Flow Meters

shipping pneumativalv:

• carrier: USPS
• transit: 3-9 Days
• class: Standard
• service: USPS Ground Advantage
• type: Calculated
• cost: $10.20

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