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Honeywell 621‑4350R Pressure Sensor — Detailed Product Overview, Specifications, Applications, Advantages, Related Models, Popular Brand Models, and FAQ
1. Product Name and Introduction
Product Name: Honeywell 621‑4350R / 6214350R
The Honeywell 621‑4350R is a reinforced industrial gauge pressure sensor designed for demanding high‑pressure environments where accuracy, robustness, and long‑term stability are essential. As a premium member of the 621 Series Industrial Pressure Sensors, this model combines rugged mechanical construction with precise electronic performance to deliver reliable pressure readings under challenging conditions.
The “R” suffix indicates a reinforced, corrosion‑resistant version. This version is engineered to tolerate higher levels of moisture, mechanical shock, vibration, and contaminants compared to standard models. It is suitable for fluid power systems, heavy machinery, industrial automation, process control, and mobile equipment where sensor failure is not an option.
The design philosophy focuses on high reliability, consistent performance, and ease of integration with industrial control systems such as PLCs, SCADA, and data acquisition units. Its robust housing and flexible electrical interfaces make it a strong choice for long‑term industrial use.
2. Brand and Series
Brand: Honeywell
Series: 621 Series Industrial Pressure Sensors
The 621 Series comprises a family of compact, rugged pressure sensors designed for precise measurement in industrial, mobile, and process applications. The series is regarded for reliable performance, wide pressure ranges, and integration versatility across a variety of sectors, including manufacturing, heavy equipment, energy, and water/wastewater systems. The 621‑4350R sits near the top of the series in terms of pressure capability and environmental resistance.
3. Product Specifications
| Parameter | Specification |
|---|---|
| Model | 621‑4350R |
| Pressure Type | Gauge pressure |
| Pressure Range | 0–4350 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) | 135 × 70 × 60 mm |
| Weight | 0.78 kg |
| Housing Material | Reinforced stainless steel with corrosion‑resistant coating |
| Seal Material | Viton or Buna‑N elastomer |
| Environmental Protection | IP67 |
| Vibration Resistance | 15 g |
| Shock Resistance | 60 g |
4. Product Applications
The Honeywell 621‑4350R is engineered for high‑demand applications where precise and reliable pressure measurement is crucial:
Industrial Automation
In automated production lines, pressure feedback is required for pneumatic and hydraulic actuator control, safety interlocks, and closed‑loop systems. The 621‑4350R delivers stable signals for precise machine control.
Heavy Machinery & Mobile Equipment
This sensor is suitable for excavators, cranes, mining machines, and agricultural equipment where high pressures and harsh mechanical conditions are common. The reinforced build offers resilience against shock and vibration.
Hydraulic & Fluid Power Systems
Used to monitor pressure in hydraulic circuits, pumps, and fluid power units. Accurate feedback supports operational safety and workforce protection.
Energy and Power Systems
Installed in high‑pressure steam lines, turbine auxiliaries, and generator fluid systems. The sensor helps maintain safety limits and optimize performance under heavy load conditions.
Water & Wastewater Management
Used in high‑pressure pumping stations and filtration control systems. The 621‑4350R helps regulate pressure to protect system components and ensure efficient fluid movement.
Chemical & Petrochemical Processes
Provides reliable pressure feedback in process loops where safety, product quality, and regulatory compliance depend on precise measurement.
5. Product Advantages
The 621‑4350R offers several distinct advantages in industrial use:
High Accuracy and Stability
With ±0.5% FS accuracy, the sensor delivers precise and repeatable pressure readings that support robust process control and diagnostics.
Reinforced Corrosion‑Resistant Construction
The reinforced stainless steel housing and corrosion‑resistant coating protect against moisture, contaminants, and mechanical wear, extending service life.
Selectable Output Signals
Selectable outputs (4–20 mA or 0–10 VDC) make the unit compatible with a wide range of control systems without the need for complex signal conversion hardware.
Wide Operating Temperature Range
Operating reliably between –40°C and +125°C makes it suitable for extreme climates and industrial conditions.
Environmental Protection
The IP67 rating ensures resistance to dust ingress and temporary water immersion, supporting installations in washdown or outdoor environments.
Superior Vibration and Shock Tolerance
Capable of withstanding up to 15 g of vibration and 60 g of shock, the sensor is suitable for mobile applications and rugged industrial equipment.
Standard Industrial Interfaces
Standard mechanical (1/4″ NPT) and sealed electrical connectors simplify installation and maintenance, reducing system downtime.
6. Related Models — Same Series or Comparable Types
| Model | Pressure Range | Output | Accuracy | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 621‑3500RC | 0–3500 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 120 × 65 × 55 | 0.60 |
| 621‑3552RC | 0–3550 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 122 × 65 × 55 | 0.60 |
| 621‑3560RC | 0–3560 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 125 × 68 × 55 | 0.65 |
| 621‑3580RC | 0–3580 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 125 × 68 × 55 | 0.66 |
| 621‑4000RC | 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 pressure accuracy | 4–20 mA / 0–10 V | 92 × 50 × 45 | 0.33 |
| SCX Series | Differential Pressure Sensor | Differential pressure measurement | 4–20 mA | 80 × 40 × 30 | 0.21 |
| ABP Series | Compact Board‑Mount Sensor | Space‑saving OEM integration | Analog / Digital | 30 × 20 × 12 | 0.05 |
| TCR700 | Temperature Sensor | Wide temperature range sensing | 4–20 mA | 65 × 22 × 15 | 0.14 |
| RH700 | Humidity & Temperature Sensor | Combined humidity and temperature | Digital | 48 × 48 × 16 | 0.11 |
8. Frequently Asked Questions (FAQ)
Q1: What type of pressure does the 621‑4350R measure?
A1: The 621‑4350R measures gauge pressure, which is pressure relative to ambient atmospheric pressure.
Q2: What is the pressure range of this sensor?
A2: It measures pressures from 0 to 4350 PSI, suitable for heavy industrial and hydraulic systems.
Q3: What output signals are available?
A3: The sensor offers selectable 4–20 mA current loop or 0–10 VDC voltage output.
Q4: What is the sensor’s accuracy?
A4: It provides ±0.5% of full scale accuracy for reliable and repeatable measurements.
Q5: Can this sensor operate in extreme temperatures?
A5: Yes, it operates reliably from –40°C to +125°C, making it suitable for cold and hot environments.
Q6: What type of media can be measured?
A6: It is compatible with air, inert gases, and non‑corrosive hydraulic fluids.
Q7: What mechanical connection does it use?
A7: It uses a standard 1/4″ NPT male threaded connection.
Q8: What environmental protection rating does it have?
A8: The 621‑4350R has an IP67 rating, providing protection from dust and temporary water immersion.
Q9: Is the sensor factory calibrated?
A9: Yes, this model is factory calibrated, though periodic verification may be recommended for critical applications.
Q10: Which industries commonly use this sensor?
A10: Commonly used in industrial automation, hydraulic systems, energy production, water/wastewater management, chemical processing, and heavy machinery.