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Honeywell 621‑3500 / 621‑3500‑R Pressure Sensor — Full Product Overview, Specifications, Applications, Advantages, Related Models, Popular Brand Models, and FAQ
1. Product Name and Introduction
Product Name: Honeywell 621‑3500 / 621‑3500‑R
The Honeywell 621‑3500 and its reinforced variant 621‑3500‑R are high-performance industrial pressure sensors engineered for high-pressure applications requiring precision, reliability, and durability. As part of the 621 Series, this model is specifically designed for environments where elevated pressures, vibration, temperature fluctuations, and exposure to harsh media are common.
The R variant enhances the standard model with reinforced corrosion-resistant housing and advanced sealing, making it suitable for extremely demanding industrial and mobile applications. The sensor provides selectable analog outputs (4–20 mA or 0–10 VDC), offering compatibility with PLCs, data acquisition systems, and other industrial controllers.
The 621‑3500 series is known for delivering long-term stability, accurate readings, and rugged performance, making it ideal for hydraulic systems, process control, heavy machinery, and energy applications where failure or inaccurate readings could have significant consequences.
2. Brand and Series
Brand: Honeywell
Series: 621 Series Industrial Pressure Sensors
The 621 Series is a well-established line of industrial-grade pressure sensors designed for heavy-duty applications. Models in this series are distinguished by their rugged construction, environmental resistance, high accuracy, and flexible output options. The 621‑3500 is among the higher-pressure models in the series, optimized for applications that require robust design and reliability under elevated pressures.
3. Product Specifications
| Parameter | Specification |
|---|---|
| Model | 621‑3500 / 621‑3500‑R |
| Pressure Type | Gauge pressure |
| Pressure Range | 0–3500 PSI |
| Accuracy | ±0.5% of Full Scale (FS) |
| Output Signal | Selectable: 4–20 mA or 0–10 VDC |
| Supply Voltage | 10–30 VDC |
| Response Time | ≤ 5 ms |
| Operating Temperature Range | –40°C to +125°C |
| Media Compatibility | Air, inert gases, non-corrosive hydraulic fluids |
| Mechanical Connection | 1/4″ NPT Male |
| Electrical Connector | Industrial sealed 3-pin connector |
| Dimensions (L × W × H) | 120 × 65 × 55 mm |
| Weight | 0.60 kg |
| Housing Material | Stainless steel (R version reinforced for corrosion resistance) |
| Seal Material | Viton or Buna-N elastomer |
| Environmental Protection | IP67 (R version enhanced protection) |
| Vibration Resistance | 10 g |
| Shock Resistance | 50 g |
4. Product Applications
The Honeywell 621‑3500 is designed for industries and systems where high pressure and environmental stress demand a robust sensor solution.
Heavy Hydraulic Systems:
Used in hydraulic presses, injection molding machines, and mobile hydraulic equipment for accurate high-pressure feedback.
Industrial Process Control:
Monitors and controls pressure in pipelines, reactors, and processing vessels in chemical, petrochemical, and energy industries.
Construction and Mobile Machinery:
Applies to excavators, cranes, and agricultural machines where vibration, shock, and high pressure are common.
Water and Wastewater Management:
Measures high-pressure flows in pumping stations, filtration systems, and pipelines.
Energy Generation and Power Systems:
Monitors hydraulic circuits, turbines, and auxiliary equipment for safety, performance, and efficiency.
Aerospace and Specialty Equipment:
Can be applied in specialized test benches or fluid control systems requiring high-precision measurements under stress.
5. Product Advantages
High Accuracy: ±0.5% FS ensures reliable and repeatable measurements under industrial conditions.
Extended Pressure Range: Capable of handling pressures up to 3500 PSI, ideal for heavy-duty hydraulics and industrial processes.
Selectable Output Signals: Offers 4–20 mA or 0–10 VDC outputs for compatibility with a variety of controllers and monitoring systems.
Rugged Mechanical Design: Stainless steel housing with reinforced sealing (R version) resists vibration, shock, and mechanical abuse.
Wide Operating Temperature Range: Operates from –40°C to +125°C for indoor and outdoor applications.
Environmental Protection: IP67 protection ensures resistance to dust and water exposure, with the R version offering enhanced corrosion resistance.
Standard Industrial Interfaces: Uses 1/4″ NPT connection and sealed 3-pin connector for easy installation in industrial systems.
Long-Term Stability: Designed for consistent performance over thousands of operational hours, reducing maintenance and recalibration needs.
6. Related Models — Same Series or Similar Types
| Model | Pressure Range | Output | Accuracy | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 621‑3000 | 0–3000 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 110 × 60 × 50 | 0.47 |
| 621‑3300 | 0–3300 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 115 × 62 × 52 | 0.55 |
| 621‑3500‑R | 0–3500 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 120 × 65 × 55 | 0.60 |
| 621‑3700 | 0–3700 PSI | 4–20 mA | ±0.5% FS | 125 × 65 × 55 | 0.62 |
| 621‑4000 | 0–4000 PSI | 4–20 mA | ±0.5% FS | 130 × 70 × 60 | 0.65 |
7. Popular Models — Other Strong Choices from the Same Brand
| Model | Sensor Type | Key Feature | Output | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| PX90 | Pressure Transducer | High industrial accuracy | 4–20 mA / 0–10 V | 92 × 50 × 45 | 0.33 |
| SCX Series | Differential Pressure Sensor | Accurate differential measurement | 4–20 mA | 80 × 40 × 30 | 0.21 |
| ABP Series | Board-Mount Pressure Sensor | Compact OEM integration | Analog / Digital | 30 × 20 × 12 | 0.05 |
| TCR700 | Temperature Sensor | Wide temperature range | 4–20 mA | 65 × 22 × 15 | 0.14 |
| RH700 | Humidity & Temperature Sensor | Dual parameter sensing | Digital | 48 × 48 × 16 | 0.11 |
8. Frequently Asked Questions (FAQ)
Q1: What type of pressure does the 621‑3500 measure?
A1: It measures gauge pressure, relative to atmospheric pressure.
Q2: What is the pressure range?
A2: 0–3500 PSI, suitable for high-pressure industrial and hydraulic applications.
Q3: What is the difference between the standard and R version?
A3: The R version has reinforced housing and sealing for enhanced corrosion resistance in harsh environments.
Q4: What output signals are available?
A4: Selectable 4–20 mA or 0–10 VDC analog signals.
Q5: What is the accuracy?
A5: ±0.5% of full scale, ensuring precise and repeatable measurements.
Q6: Can it operate in extreme temperatures?
A6: Yes, the operating range is –40°C to +125°C.
Q7: Which media are compatible?
A7: Air, inert gases, and non-corrosive hydraulic fluids.
Q8: What type of mechanical connection is used?
A8: Standard 1/4″ NPT male threaded connection.
Q9: Does the sensor resist vibration and shock?
A9: Yes, it tolerates vibration up to 10 g and shock up to 50 g.
Q10: What industries commonly use this sensor?
A10: Industrial automation, hydraulics, mobile and construction machinery, energy production, process control, and water/wastewater management.