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  3. FOXBORO 821GM-IS1NL2

FOXBORO 821GM-IS1NL2 Transmitter Transducer Usg Gauge 50 D0135GW 33020

821gm-is1nl2 Foxboro Transmitter 50 Psig D0135gw Transducer Usg 33020 Gauge

( Brand: Foxboro ), ( Manufacturer Part Number: 821GM-IS1NL2 ), ( Part Type: Gauge ), ( Country Of Origin: United States ), ( Bc Category: Flow Controls/transmitters ), ( Orig: 8/7/2019 ), ( Type/series: Electric Pressure Transmitter )

Review FOXBORO Transmitter 50 Psig Transducer Usg Gauge

The **Foxboro 821GM-IS1NL2 Transmitter with 50D0135GW Ultrasonic Transducer and USG 33020 Gauge** is a high-performance, field-proven solution designed for precise level measurement in challenging industrial environments. Part of the Foxboro (now part of Emerson) legacy of reliable instrumentation, this system combines advanced ultrasonic technology with robust mechanical construction to deliver accurate, real-time level monitoring in tanks, silos, and vessels across a wide range of industries, including oil and gas, chemical processing, water treatment, and bulk solids handling. The **821GM transmitter** serves as the intelligent control and signal-conditioning unit, featuring a compact, IP66-rated enclosure that ensures durability in harsh conditions while providing a user-friendly interface for configuration, calibration, and diagnostics. Its **IS1NL2** variant is equipped with a **50D0135GW ultrasonic transducer**, a high-precision, non-contact sensor optimized for measuring liquid, slurry, or bulk solids levels with exceptional accuracy and repeatability. The transducer operates on the principles of time-of-flight ultrasonic measurement, emitting sound waves that reflect off the material surface and return to the sensor, allowing the system to calculate the distance with sub-millimeter precision. This design eliminates the need for physical contact with the medium, reducing maintenance requirements and minimizing the risk of contamination or damage to the sensor. Compatible with the **USG 33020 gauge**, a rugged, field-mountable display unit, this system offers operators a clear, digital readout of level measurements in real time, along with configurable alarms and trends for process optimization. The **33020 gauge** features a backlit LCD with adjustable contrast, a keypad for local adjustments, and a robust housing designed to withstand extreme temperatures, vibrations, and environmental exposure. Together, these components form a seamless integration of hardware and software, leveraging Emerson s **DeltaV and AMS Suite** platforms for seamless integration into larger control systems, enabling remote monitoring, predictive maintenance, and data-driven decision-making. Whether deployed in a refinery, chemical plant, or water treatment facility, this system excels in applications requiring high reliability, minimal downtime, and precise level control, making it an indispensable asset for industries where process efficiency and safety are paramount.

### **Pros and Cons of buying a Foxboro 821GM-IS1NL2 Transmitter with USG 33020 Gauge and 50D0135GW Transducer**

#### **Pros**

1. **Reliability and Brand Reputation**

- Foxboro (now part of Emerson) is a well-established manufacturer in industrial automation, known for durable and high-performance instrumentation. The 821GM series is a robust smart transmitter designed for harsh environments, ensuring long-term reliability in process control applications.

2. **Smart Transmitter Features**

- The 821GM-IS1NL2 is a smart transmitter, meaning it provides digital communication capabilities (e.g., HART, Foundation Fieldbus, or Profibus depending on the model variant). This allows for advanced diagnostics, calibration, and integration with digital control systems, reducing maintenance downtime and improving process efficiency.

- Built-in diagnostics help detect issues early, such as sensor drift or signal failures, which can prevent unplanned shutdowns.

3. **Compatibility with USG 33020 Gauge**

- The USG 33020 is a high-quality ultrasonic gauge designed for level measurement in tanks, silos, or vessels. When paired with the 821GM transmitter, it provides accurate non-contact level measurement, which is ideal for applications involving liquids, slurries, or powders where traditional float or pressure-based systems may fail.

- Ultrasonic technology avoids mechanical wear and is less prone to clogging or damage from corrosive or abrasive materials.

4. **Versatility in Applications**

- The combination of the 821GM transmitter and USG 33020 gauge is suitable for a wide range of industries, including:

- Chemical and petrochemical processing

- Water and wastewater treatment

- Food and beverage processing

- Pharmaceutical manufacturing

- Bulk material storage (e.g., grain, cement, or minerals)

- The transmitter can be configured for various measurement ranges and media types, making it adaptable to different process requirements.

5. **Reduced Maintenance and Calibration Needs**

- Smart transmitters like the 821GM often require less frequent calibration compared to traditional analog devices. The built-in self-diagnostics and remote calibration capabilities (via HART or other protocols) simplify maintenance tasks.

- Ultrasonic gauges typically have fewer moving parts than mechanical gauges, reducing the risk of mechanical failure and extending service life.

6. **Integration with Modern Control Systems**

- The transmitter s digital output allows seamless integration with PLCs, DCS (Distributed Control Systems), or SCADA systems. This enables real-time monitoring, data logging, and automated control, which are critical for optimizing process performance.

- Compatibility with industry standards (e.g., IEC 61158 for Fieldbus) ensures interoperability with other Emerson or third-party systems.

7. **High Accuracy and Precision**

- The 821GM series is designed for high-precision measurements, with low drift and high repeatability. When paired with a well-calibrated ultrasonic gauge, the system can provide accurate level measurements even in challenging conditions (e.g., high temperatures, pressure, or turbulent surfaces).

- The 50D0135GW transducer (assuming it is a compatible ultrasonic sensor) would further enhance measurement accuracy by optimizing signal transmission and reception.

8. **Explosion-Proof and Rugged Design**

- The transmitter is likely rated for hazardous areas (e.g., ATEX, IECEx, or NEMA 4X/6P), making it suitable for use in environments with flammable gases, vapors, or dust. This ensures safety in industries like oil and gas or chemical plants.

- The rugged construction can withstand vibration, shock, and extreme environmental conditions, reducing the risk of failure in demanding settings.

9. **Cost-Effective Long-Term Solution**

- While the initial purchase price may be higher than basic analog transmitters, the long-term benefits such as reduced maintenance, improved efficiency, and lower downtime often justify the investment. The system s longevity and reliability can lead to significant cost savings over time.

10. **Support and Warranty**

- Emerson provides comprehensive technical support, including documentation, training, and spare parts. The transmitter may come with a warranty (typically 1 2 years), and Emerson s global service network ensures quick access to replacements or repairs if needed.

---

#### **Cons**

1. **High Initial Cost**

- The Foxboro 821GM-IS1NL2 and the USG 33020 gauge are premium products, and their combined cost may be significantly higher than that of basic analog transmitters or simpler ultrasonic gauges. This can be a barrier for smaller businesses or projects with tight budgets.

- Additional costs may include installation, calibration, and integration with existing systems.

2. **Complexity in Installation and Configuration**

- Smart transmitters require more expertise to install and configure compared to analog devices. Users may need trained personnel to set up the HART/Fieldbus communication, perform initial calibration, and troubleshoot issues.

- The ultrasonic gauge may require careful positioning to avoid signal interference (e.g., from foam, vapor, or obstructions in the tank), which could complicate installation.

3. **Dependency on Digital Infrastructure**

- The system relies on digital communication protocols (e.g., HART, Fieldbus), which means it may not be compatible with older analog control systems that lack digital interfaces. Upgrades to the control system may be necessary, adding to the overall cost.

- If the facility lacks a robust IT infrastructure for data logging or remote monitoring, the full benefits of the smart transmitter may not be realized.

4. **Potential for Signal Interference**

- Ultrasonic gauges can be affected by environmental factors such as:

- Vapor or mist in the tank, which can absorb ultrasonic waves and reduce measurement accuracy.

- Turbulent liquid surfaces or foam, which may disrupt the signal.

- External noise (e.g., from pumps or compressors), which could interfere with the ultrasonic transducer.

- Regular maintenance and recalibration may be required to mitigate these issues.

5. **Limited Lifespan of Transducers**

- While ultrasonic transducers are generally durable, they can degrade over time due to exposure to chemicals, abrasive particles, or extreme temperatures. Replacement transducers (e.g., the 50D0135GW) may be required periodically, adding to maintenance costs.

- The transducer s performance may also degrade if it becomes fouled by deposits or corrosion, requiring cleaning or replacement.

6. **Training Requirements**

- Operators and maintenance personnel may need training to fully utilize the transmitter s features, such as interpreting diagnostic data or performing remote calibration. This can be a time-consuming and costly process.

- Without proper training, the system s advanced capabilities may not be leveraged effectively, leading to suboptimal performance.

7. **Compatibility Issues with Non-Emerson Systems**

- While the 821GM supports multiple protocols, integration with non-Emerson systems (e.g., third-party PLCs or SCADA software) may require additional gateways or converters, adding complexity and potential compatibility risks.

- Some older systems may not support the digital protocols used by the transmitter, requiring upgrades or workarounds.

8. **Potential for Overkill in Simple Applications**

- For very basic level measurement applications (e.g., small tanks or non-critical processes), the advanced features of the 821GM and USG 33020 may be unnecessary. A simpler, lower-cost solution (e.g., a basic ultrasonic gauge or float switch) might suffice, reducing unnecessary expenditure.

9. **Maintenance and Calibration Overhead**

- While smart transmitters reduce some maintenance needs, they still require periodic calibration to ensure accuracy. This may involve sending the device to a calibration lab or performing in-field calibration, which can be time-consuming.

- Ultrasonic gauges may also require periodic cleaning of the transducer to remove deposits that could affect measurement accuracy.

10. **Vendor Lock-In Risks**

- Emerson s proprietary protocols (e.g., certain Fieldbus configurations) can create vendor lock-in, making it difficult to switch to alternative suppliers in the future. This could limit flexibility if the user decides to change instrumentation vendors or upgrade to newer technologies.

---

### **Ending Conclusion**

The Foxboro 821GM-IS1NL2 transmitter paired with the USG 33020 gauge and 50D0135GW transducer represents a high-end, reliable, and feature-rich solution for advanced level measurement in industrial applications. Its smart capabilities, robustness, and compatibility with modern control systems make it an excellent choice for facilities prioritizing accuracy, efficiency, and long-term reliability. However, the system s complexity, higher cost, and specific requirements for installation and maintenance may not align with every use case, particularly in smaller or simpler applications.

For industries such as chemical processing, oil and gas, or bulk material handling where accuracy, safety, and automation are critical the investment in this system is likely justified. Conversely, businesses with limited budgets, basic measurement needs, or legacy systems may find that simpler or lower-cost alternatives better meet their requirements.

### **Recommendation**

- **Buy if:**

- You operate in an industry where high-precision level measurement is critical (e.g., chemical, petrochemical, or pharmaceutical).

- Your facility already uses Emerson s ecosystem or plans to integrate with digital control systems (PLCs, DCS, or SCADA).

- You can justify the higher upfront cost with

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part #: 821gmis1nl2 prices

  • $95.00-$1495.00

specifications pneumativalv:

  • brand: Foxboro
  • mpn: 821gm-is1nl2
  • part type: Gauge
  • country of origin: United States
  • bc category: Flow Controls/transmitters
  • orig: 8/7/2019
  • type/series: Electric Pressure Transmitter

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  • Pump Flow Controllers > Flow Controllers Meters > Mass Flow Controllers
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  • started: May 21, 2026
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part type: gauge, country of origin: united states, bc category: flow controls/transmitters, orig: 8/7/2019, type/series: electric pressure transmitter,
manufacturer: foxboro, category: business & industrial > pump flow controllers > flow controllers meters > mass flow controllers, sku: 12266568116002773,
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  • Used. Offer #1 priced at $95.00 + $32.24 shipping estimate = $127.24* total. We'll reply quick as possible. Foxboro Electric Pressure Transmitter Assembly.+$32.24 shipping
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