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- 621-2175 6212175 621-2175R
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Honeywell 621-2175 / 621-2175R Pressure Sensor — Detailed Product Description, Specifications, Applications, Advantages, Related Models, Brand Popular Models, and FAQ
1. Product Name and Overview
Product Name: Honeywell 621-2175 / 6212175 / 621-2175R
The Honeywell 621-2175 series pressure sensors are industrial grade devices designed to provide high-accuracy pressure measurement, robust performance, and reliable operation in harsh environments. The base model 621-2175 offers standard industrial performance, while the 621-2175R version is a reinforced corrosion-resistant variant for installations where exposure to moisture, chemicals, vibration, or contaminants is likely.
These sensors are engineered for integration into control systems, PLCs, data loggers, and monitoring platforms where consistent pressure feedback is critical. They are suitable for pneumatic, hydraulic, and process fluid systems where pressure measurement accuracy and durability directly impact system performance, efficiency, and safety.
The focus of the design is on dependable performance over long service life, multifunction application capability, and stable output for industrial automation and feedback loops.
2. Brand and Product Series
Brand: Honeywell
Product Series: 621 Series Industrial Pressure Sensors
The 621 Series represents a line of compact, rugged pressure sensors intended for industrial use. This series is known for its wide range of pressure options, selectable electronic outputs, solid mechanical construction, broad operating temperature range, and standardized industrial connectors. Sensors in the 621 Series are widely used in manufacturing, fluid power systems, environmental control systems, mobile machinery, and energy applications.
3. Detailed Specifications
| Parameter | 621-2175 | 621-2175R |
|---|---|---|
| Model | 621-2175 | 621-2175R |
| Pressure Type | Gauge pressure | Gauge pressure |
| Pressure Range | 0–1750 PSI | 0–1750 PSI |
| Accuracy | ±0.5% of Full Scale (FS) | ±0.5% of Full Scale (FS) |
| Output Signal | Selectable: 4–20 mA or 0–10 VDC | Selectable: 4–20 mA or 0–10 VDC |
| Supply Voltage | 10–30 VDC | 10–30 VDC |
| Response Time | ≤ 5 ms | ≤ 5 ms |
| Operating Temperature | –40°C to +125°C | –40°C to +125°C |
| Media Compatibility | Air, inert gases, hydraulic oil | Air, inert gases, hydraulic oil |
| Mechanical Connection | 1/4″ NPT Male | 1/4″ NPT Male |
| Electrical Connector | Industrial sealed 3-pin connector | Industrial sealed 3-pin connector |
| Dimensions (L × W × H) | 102 × 56 × 45 mm | 102 × 56 × 45 mm |
| Weight | 0.40 kg | 0.43 kg |
| Housing Material | Stainless steel | Stainless steel with corrosion-resistant finish |
| Seal Material | Viton / Buna-N elastomer | Viton / Buna-N elastomer |
| Environmental Protection | IP67 | IP68 |
| Vibration Resistance | 10 g | 10 g |
| Shock Resistance | 50 g | 50 g |
4. Product Applications
The Honeywell 621-2175 / 621-2175R pressure sensors are engineered to serve in a variety of demanding applications where accurate pressure measurement, rugged performance, and reliability are critical.
Industrial Automation and Control:
These sensors provide real-time pressure feedback for pneumatic actuators, hydraulic valves, pressure regulators, safety systems, and automated process control loops. Accurate pressure data enhances machine performance and efficient system regulation.
Hydraulic and Pneumatic Systems:
These devices are suitable for heavy-duty hydraulic circuits, compressors, fluid power systems, and pneumatic equipment where consistent pressure measurement ensures safe operation and prolongs equipment life.
Mobile Equipment and Heavy Machinery:
Installed on construction, mining, agricultural, and industrial vehicles to monitor system pressures under dynamic load conditions. Withstands vibration and mechanical forces while providing stable pressure output.
HVAC, Refrigeration and Building Services:
Used to monitor pressures on refrigerant lines, air ducts, blower systems, and heat exchange circuits. This measurement assists in optimizing heating and cooling processes and preventing compressor damage.
Water & Wastewater Treatment and Pump Control:
Applies to pressure monitoring in distribution lines, filtration systems, pump stations, and fluid reservoirs. Helps maintain optimal flow rates, prevent overshoot, and manage energy consumption in municipal and industrial water systems.
Energy Production and Power Systems:
Used in turbines, generators, steam systems, and auxiliary fluid systems. Stable pressure measurement contributes to safety interlocks, performance monitoring, and efficiency regulation in energy environments.
5. Product Advantages
High Accuracy and Repeatability:
Both versions of the 621-2175 sensor deliver ±0.5% full-scale accuracy across the full pressure range, ensuring minimal deviation in measurement for reliable machine and process control.
Reinforced Corrosion-Resistant Design (R Version):
The 621-2175R includes enhanced corrosion protection, reinforced housing materials, and improved sealing to tolerate harsh environments where moisture, chemicals, or airborne contaminants are present.
Selectable Output Compatibility:
Selectable analog outputs (4–20 mA or 0–10 VDC) allow direct interface with PLCs, controllers, data loggers, and industrial control systems without additional transducers or converters.
Industry-Standard Interfaces:
Standard mechanical and electrical interfaces (1/4″ NPT and sealed 3-pin connector) simplify installation and replacement without requiring special fittings.
Wide Operating Temperature Range:
Operating from –40°C to +125°C enables use in both cold-climate facilities and high-temperature machine enclosures.
Environmental Protection and Durability:
The IP67 (standard) and IP68 (reinforced) enclosure ratings deliver protection from dust and temporary or extended water immersion. These sensors are built to withstand industrial vibration and shock conditions.
6. Recommended Models — Same Series or Related Types
Below are five related models from the 621 Series or similar product families that may serve adjacent pressure measurement needs:
| Model | Pressure Range | Output | Accuracy | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 621-1201R | 0–200 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 80 × 45 × 35 | 0.24 |
| 621-1500R | 0–500 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 90 × 50 × 40 | 0.29 |
| 621-2100R | 0–1000 PSI | 4–20 mA / 0–10 V | ±0.5% FS | 95 × 52 × 42 | 0.34 |
| 621-2500R | 0–2000 PSI | 4–20 mA | ±0.5% FS | 105 × 58 × 48 | 0.41 |
| 621-3000R | 0–3000 PSI | 4–20 mA | ±0.5% FS | 110 × 60 × 50 | 0.47 |
7. Popular Models — Other Strong Choices from the Same Brand
Below are five popular industrial sensor models from the same brand known for performance and usage in a wide range of measurement 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 | Differential pressure monitoring | 4–20 mA | 80 × 40 × 30 | 0.21 |
| ABP Series | OEM Pressure Sensor | Compact board-mount design | 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 & temperature | Digital | 48 × 48 × 16 | 0.11 |
8. Frequently Asked Questions (FAQ)
Q1: What does the Honeywell 621-2175 measure?
A1: This sensor measures gauge pressure — the pressure relative to ambient atmospheric pressure in pneumatic, hydraulic, or fluid systems.
Q2: What is the standard pressure range for these models?
A2: The typical pressure range is 0–1750 PSI, suitable for high-pressure industrial applications.
Q3: What is the difference between 621-2175 and 621-2175R?
A3: The “R” version has reinforced corrosion resistance, with improved housing and sealing to withstand harsher environments.
Q4: What output options are available on this sensor?
A4: Users can choose between 4–20 mA current output or 0–10 VDC voltage output depending on system interface requirements.
Q5: What is the accuracy of this pressure sensor?
A5: Both versions offer ±0.5% of full scale accuracy, providing reliable and consistent pressure measurements.
Q6: What fluids or gases can be measured?
A6: The sensor is compatible with air, inert gases, and non-corrosive hydraulic fluids. It is important to verify media compatibility for specific installation conditions.
Q7: What connection interfaces does the sensor use?
A7: It uses a 1/4″ NPT male mechanical connection and an industrial-grade sealed 3-pin electrical connector for secure installations.
Q8: Can the sensor be used outdoors?
A8: Yes. With an operating temperature range of –40°C to +125°C and IP67/IP68 protection, it is suitable for outdoor and industrial environments.
Q9: Is regular calibration required?
A9: Although factory calibrated, periodic calibration verification is recommended for critical control systems or safety-dependent processes.
Q10: Which industries typically use these sensors?
A10: They are widely used in industrial automation, hydraulics, HVAC, mobile machinery, water treatment, energy systems, and process manufacturing for reliable pressure monitoring.