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Honeywell 621‑6550RC (6216550RC) Pressure Sensor — Complete Product Overview, Specifications, Applications, Advantages, Related Models, Popular Brand Models, and FAQ
1. Product Name and Introduction
Product Name: Honeywell 621‑6550RC / 6216550RC
The Honeywell 621‑6550RC is a rugged, high‑performance industrial pressure sensor engineered for very high gauge pressure measurement in severe environments. As a reinforced and corrosion‑resistant variant of the 621 Series, this model is built for consistent, long‑term performance in applications where accuracy and durability are essential.
This sensor combines robust mechanical construction with highly stable sensing electronics to provide accurate feedback for control systems, safety interlocks, and data logging systems. The reinforced “RC” designation reflects its enhanced ability to withstand moisture, dust, shock, vibration, and corrosive atmospheres, making it suitable for installation in the most demanding industrial and mobile hydraulic environments.
The 621‑6550RC is widely incorporated into systems that require continuous and dependable pressure monitoring under extreme conditions, such as heavy hydraulic presses, energy generation systems, high‑pressure pipelines, and large‑scale process control.
2. Brand and Product Series
Brand: Honeywell
Series: 621 Series Industrial Pressure Sensors
The 621 Series represents a family of industrial‑grade pressure sensors designed for reliable and precise gauge pressure measurement across a wide spectrum of applications. Products in this series are known for:
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Rugged construction suitable for harsh industrial environments
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Wide pressure range coverage from low to extremely high pressures
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Selectable analog outputs compatible with standard industrial automation systems
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Standardized mechanical interfaces for easy installation and replacement
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Consistent long‑term performance with minimal drift
The 621‑6550RC is among the highest‑range sensors in the series and offers reinforced protection for challenging installations.
3. Product Specifications
| Parameter | Specification |
|---|---|
| Model | 621‑6550RC |
| Pressure Type | Gauge pressure |
| Pressure Range | 0–6550 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) | 152 × 82 × 66 mm |
| Weight | 1.05 kg |
| Housing Material | Reinforced stainless steel with corrosion‑resistant finish |
| Seal Material | Viton or Buna‑N elastomer |
| Environmental Protection | IP67 |
| Vibration Resistance | 15 g |
| Shock Resistance | 60 g |
4. Product Applications
The Honeywell 621‑6550RC pressure sensor is designed for a wide range of applications that require precise, high‑range pressure measurement and robust performance:
Industrial Automation and Process Control
Used to monitor hydraulic pressure in automated manufacturing systems, ensuring consistent performance of actuators, valves, and safety interlocks. Accurate pressure feedback helps maintain product quality and process consistency.
Heavy Machinery and Mobile Equipment
Installed on construction machinery, mining rigs, and agricultural equipment to measure hydraulic pressures under mechanical stress, impact, and vibration. The reinforced design extends sensor life in these demanding mobile applications.
Hydraulic Systems and Fluid Power Units
Applied in high‑pressure hydraulic circuits, fluid power systems, and heavy presses. Real‑time pressure feedback supports system safety and improves operational efficiency.
Energy and Power Generation
Used in turbines, generators, and auxiliary fluid circuits where pressure monitoring is critical for both safety and performance optimization.
Water and Wastewater Infrastructure
Installed in high‑pressure pumping stations and distribution pipelines to support preventive maintenance, system protection, and efficient operation.
Chemical and Petrochemical Plants
Used in high‑pressure process loops where precise monitoring prevents system failures, improves safety, and supports compliance with regulatory standards.
5. Product Advantages
The 621‑6550RC pressure sensor offers several key benefits that make it a strong choice for demanding industrial systems:
High Accuracy and Repeatability
With ±0.5% FS accuracy, the sensor provides highly stable and reliable readings across the entire pressure range, suitable for tight control and monitoring loops.
Corrosion‑Resistant Reinforced Construction
The reinforced housing and corrosion‑resistant finish protect internal components from aggressive environments, moisture, and contaminants, significantly enhancing durability.
Flexible Output Signals
Selectable 4–20 mA or 0–10 VDC outputs allow integration with a wide range of industrial controllers, data acquisition, and automation systems without the need for additional converters.
Wide Operating Temperature Range
Functional from –40°C to +125°C, the sensor performs reliably in both extremely cold and hot conditions, supporting outdoor and industrial applications.
Industrial‑Grade Environmental Protection
An IP67 rating ensures dust resistance and protection from temporary water immersion, making it suitable for washdown, outdoor installations, and harsh environments.
Robust Vibration and Shock Resistance
Designed to withstand 15 g vibration and 60 g shock, the sensor is ideal for mobile equipment and heavy industrial machinery.
Standardized Mechanical Interface
The 1/4″ NPT male threaded connection and sealed electrical connector simplify installation, facilitating routine maintenance and replacement if needed.
6. Recommended Models — Same Series or Related Types
Below are five related or comparable pressure sensor models from the 621 Series that offer similar industrial performance, varying mainly in pressure range or specific design focus:
| Model | Pressure Range | Output | Accuracy | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 621‑6500RC | 0–6500 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 150 × 80 × 65 | 1.00 |
| 621‑6350RC | 0–6350 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 150 × 80 × 65 | 0.95 |
| 621‑6300R | 0–6300 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 150 × 80 × 65 | 0.95 |
| 621‑6250RC | 0–6250 PSI | 4–20 mA | ±0.5% FS | 150 × 80 × 64 | 0.96 |
| 621‑6000 | 0–6000 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 148 × 78 × 63 | 0.92 |
7. Popular Models — Other Strong Choices from the Same Brand
Below are five popular sensors from the same brand that serve complementary measurement needs across industrial applications:
| 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 | Measures small differential ΔP | 4–20 mA | 80 × 40 × 30 | 0.21 |
| ABP Series | Compact Board‑Mount Sensor | Space‑efficient 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 does the Honeywell 621‑6550RC measure?
A1: It measures gauge pressure, which is pressure relative to atmospheric pressure.
Q2: What is the pressure range of this sensor?
A2: It measures from 0 to 6550 PSI, suitable for very high‑pressure industrial applications.
Q3: What output signals are supported?
A3: Selectable 4–20 mA current and 0–10 VDC voltage outputs are supported.
Q4: What is the accuracy of this sensor?
A4: The 621‑6550RC offers ±0.5% of full scale accuracy for reliable and repeatable readings.
Q5: What operating temperature range does it support?
A5: It operates reliably between –40°C and +125°C, allowing use in extreme conditions.
Q6: What media can this sensor measure?
A6: Compatible media include air, inert gases, and non‑corrosive hydraulic fluids. Always verify specific media compatibility before installation.
Q7: What mechanical connection does the sensor use?
A7: It uses a 1/4″ NPT male threaded mechanical connection for installation.
Q8: What environmental protection does it have?
A8: The sensor is rated IP67, providing resistance to dust ingress and temporary immersion in water.
Q9: Is the sensor factory‑calibrated?
A9: Yes, the 621‑6550RC is factory‑calibrated for immediate use in industrial systems. Periodic calibration verification may be recommended for critical applications.
Q10: Which industries commonly use this model?
A10: It is widely used in industrial automation, hydraulic systems, heavy machinery, energy generation, process control, and water/wastewater management.