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Honeywell 621‑3502 (6213502) Pressure Sensor — Full Product Overview, Specifications, Applications, Advantages, Related Models, Popular Brand Models, and FAQ
1. Product Name and Introduction
Product Name: Honeywell 621‑3502 / 6213502
The Honeywell 621‑3502 is an industrial pressure sensor designed to deliver accurate, reliable, and long‑lasting gauge pressure measurement in demanding environments. As part of the 621 Series, this model is engineered for heavy‑duty applications such as high‑pressure hydraulic systems, process automation, and mobile machinery. The design emphasizes ruggedness, stable analog output signals, and compatibility with industrial control systems including PLCs and monitoring units.
This sensor is built to withstand physical stresses including vibration, shock, temperature variation, and moisture. The 621‑3502 provides reliable pressure feedback needed for process control, safety interlocks, performance optimization, and system diagnostics. It is especially suitable in systems where precise pressure measurement directly impacts operational safety and efficiency.
2. Brand and Series
Brand: Honeywell
Series: 621 Series Industrial Pressure Sensors
The 621 Series encompasses a range of industrial pressure transducers known for robust design, industrial strength environmental protection, wide temperature operation, and versatile electrical output options. These sensors are widely used across automation systems, hydraulics, mobile equipment, energy production, and water/wastewater facilities where pressure accuracy and reliability are essential.
3. Product Specifications
| Parameter | Specification |
|---|---|
| Model | 621‑3502 |
| 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 | 0.58 kg |
| Housing Material | Stainless steel |
| Seal Material | Viton or Buna‑N elastomer |
| Environmental Protection | IP67 |
| Vibration Resistance | 10 g |
| Shock Resistance | 50 g |
4. Product Applications
The Honeywell 621‑3502 pressure sensor is used in a wide variety of industrial and commercial applications where precise gauge pressure measurement is critical to operational success.
Industrial Automation & Control Systems:
In automated production systems, this sensor provides reliable pressure feedback for pneumatics, hydraulics, safety interlocks, and regulatory loops, contributing to improved efficiency and system stability.
Heavy‑Duty Hydraulic Systems:
Used in heavy machinery and static industrial hydraulic systems to monitor high‑pressure circuits, ensuring pump performance and system integrity.
Mobile Equipment & Construction Machinery:
Installed on equipment such as excavators, cranes, and loaders where pressure feedback guides actuators, protects system components, and supports safe operation under varying load and terrain conditions.
Water & Wastewater Treatment:
In high‑pressure pump stations and pipeline monitoring, this sensor helps regulate and protect pumps, valves, and filtration systems for energy‑efficient and safe operation.
Energy Production & Power Systems:
Used in turbines, generators, and auxiliary hydraulic controls where accurate pressure measurement is essential for performance, safety, and system diagnostics.
Process Control in Chemical & Petrochemical Industries:
Applied in pressure vessels and high‑pressure process loops where consistent and accurate measurement helps preserve product quality and maintain safe operating conditions.
5. Product Advantages
The 621‑3502 offers several key advantages that make it a strong choice for demanding industrial applications.
High Accuracy & Stability
With ±0.5% of full‑scale accuracy, the 621‑3502 provides precise and repeatable pressure readings, vital for control systems and performance optimization.
Wide Pressure Range
Capable of measuring pressure up to 3500 PSI, this sensor accommodates a broad range of high‑pressure applications.
Flexible Output Options
Selectable 4–20 mA or 0–10 VDC outputs allow integration with a wide variety of industrial controllers, data loggers, PLCs, and monitoring systems without the need for signal converters.
Rugged & Reliable Design
Stainless steel housing and durable elastomer seals provide rugged protection against mechanical stress, vibration, and environmental factors.
Broad Operating Temperature
With a wide temperature range from –40°C to +125°C, it maintains reliable performance in cold outdoor environments and hot industrial enclosures.
Industrial Protection Rating
The IP67 environmental protection rating ensures resistance to dust ingress and temporary water exposure, making it suitable for washdown zones and outdoor installations.
Standard Industrial Interfaces
Standardized mechanical connectivity (1/4″ NPT) and sealed electrical connection make installation straightforward and maintenance simple.
6. Recommended Models — Same Series or Related Types
Below are five models in the 621 Series or similar industrial pressure sensors that provide comparable performance but cover different ranges or focus areas:
| 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 | 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
The following list presents five popular sensor models from the same brand that are broadly used in industrial measurement and control applications:
| Model | Sensor Type | Key Feature | Output | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| PX90 | Pressure Transducer | Industrial high accuracy | 4–20 mA / 0–10 V | 92 × 50 × 45 | 0.33 |
| SCX Series | Differential Pressure Sensor | Differential pressure monitoring | 4–20 mA | 80 × 40 × 30 | 0.21 |
| ABP Series | Compact Board‑Mount Pressure 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 | Dual humidity and temperature | Digital | 48 × 48 × 16 | 0.11 |
8. Frequently Asked Questions (FAQ)
Q1: What type of pressure measurement does the Honeywell 621‑3502 provide?
A1: The 621‑3502 provides gauge pressure measurement, which means it measures pressure in relation to atmospheric pressure.
Q2: What pressure range does this model support?
A2: This sensor supports a pressure range from 0 to 3500 PSI, making it suitable for high‑pressure industrial applications.
Q3: What output signals are available on this sensor?
A3: The 621‑3502 offers selectable analog outputs: 4–20 mA current loop or 0–10 VDC voltage output.
Q4: How accurate is the 621‑3502?
A4: This sensor provides an accuracy of approximately ±0.5% of full scale, which ensures consistent and reliable pressure measurements.
Q5: What media can this sensor measure?
A5: It is compatible with air, inert gases, and non‑corrosive hydraulic fluids, but media compatibility should be confirmed before installation.
Q6: What environmental conditions can the sensor withstand?
A6: The 621‑3502 is rated IP67, which means it can resist dust ingress and temporary immersion in water. It is suitable for industrial environments and outdoor installations.
Q7: What mechanical connection is used for installation?
A7: The sensor uses a 1/4″ NPT male threaded connection, a standard industrial fitting for pressure equipment.
Q8: Does the sensor require periodic calibration?
A8: It comes factory‑calibrated. Depending on the application and regulatory requirements, periodic verification or calibration may be recommended.
Q9: What operating temperature range does this sensor support?
A9: It supports a broad operating range of –40°C to +125°C, suitable for both cold‑climate and high‑temperature industrial environments.
Q10: In what industries is the 621‑3502 commonly used?
A10: Typical industries include industrial automation, heavy machinery, hydraulics, water/wastewater systems, energy production, and process control environments where accurate high‑pressure measurement is required.