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Honeywell 621-1201 Pressure Sensor — Detailed Product Description, Specifications, Applications, Advantages, Related Models, Popular Models, and FAQ
1. Product Name and Introduction
Product Name: Honeywell 621-1201
The Honeywell 621-1201 is a precision industrial pressure sensor designed for high-reliability measurement and control of pneumatic and hydraulic systems. It combines robust sensor design, accurate pressure measurement, and flexible output compatibility to satisfy a wide range of industrial and commercial needs. This sensor is engineered to maintain consistent performance over time and under diverse environmental conditions, making it suitable for harsh industrial environments and continuous operation.
The 621-1201 typically finds use in control systems, automation equipment, HVAC systems, fluid power systems, and other applications where precise pressure feedback is essential for safe and efficient operation.
2. Brand and Series
Brand: Honeywell
Series: 621 Series Pressure Sensors
The 621 Series is a family of compact, rugged pressure sensors designed to provide dependable pressure measurement in industrial applications. These sensors are distinguished by wide operating temperature ranges, selectable output options, and rugged mechanical construction, enabling broad applicability across sectors such as automation, HVAC/R, mobile machinery, and process control.
3. Detailed Specifications
| Parameter | Specification |
|---|---|
| Model | 621-1201 |
| Pressure Type | Gauge pressure |
| Pressure Range | 0–200 PSI |
| Accuracy | ±0.5% of Full Scale |
| Output Signal | 4–20 mA or 0–5 VDC selectable |
| Supply Voltage | 10–30 VDC |
| Response Time | < 5 ms |
| Temperature Range | –40°C to +125°C |
| Media Compatibility | Air, inert gases, oils |
| Mechanical Connection | 1/4″ NPT Male |
| Electrical Connector | 3-pin industrial connector |
| Dimensions (L × W × H) | 80 × 45 × 35 mm |
| Weight | 0.20 kg |
| Enclosure Rating | IP67 |
| Vibration Tolerance | 10 g |
| Shock Resistance | 50 g |
| Housing Material | Stainless steel |
| Seal Material | Buna-N or Viton |
4. Product Applications
The Honeywell 621-1201 pressure sensor serves as a reliable instrument for measuring and controlling pressure in a variety of systems. Typical application scenarios include:
1. Industrial Automation Systems
Used for feedback in closed-loop control of pneumatic and hydraulic actuation. Reliable pressure feedback supports repeatable positioning, controlled motion, and safety interlocks in automated machinery.
2. HVAC and Refrigeration Systems
Monitors system pressures such as refrigerant lines, airflow systems, and duct pressures. Ensures system efficiency, protects compressors, and enables precise control of heating and cooling cycles.
3. Mobile Machinery and Equipment
Installed on construction equipment, agricultural machines, and material handling systems to monitor hydraulic and fuel pressures that affect performance, safety, and longevity.
4. Fluid Power and Pneumatic Systems
Provides real-time pressure information for pumps, valves, compressors, and other equipment requiring pressure regulation, filtration monitoring, or safety cutoffs.
5. Water and Wastewater Management
Used in pump control systems and filtration applications to measure system pressures and maintain proper flow rates and levels in treatment plants.
5. Product Advantages
The 621-1201 delivers several notable advantages for users seeking reliable industrial pressure sensing solutions:
High Accuracy and Stability
±0.5% full-scale accuracy ensures consistent pressure measurement for control and diagnostic purposes.
Wide Operating Temperature Range
Operates effectively from –40°C to +125°C, suitable for both cold-climate outdoor systems and high-heat industrial enclosures.
Versatile Output Selection
Selectable analog outputs (4–20 mA or 0–5 VDC) allow seamless integration into a variety of PLCs, data acquisition systems, and control modules without the need for signal converters.
Rugged Mechanical Construction
Sturdy stainless steel housing and robust internal components resist mechanical stress, vibration, and shock during operation.
Compact and Space-Efficient Design
Designed with a compact form factor to accommodate installation in systems where space is limited, yet performance requirements remain high.
Effective Environmental Protection
IP67 enclosure rating ensures resistance to dust and temporary immersion in water, minimizing risks of failure in industrial environments.
6. Related Models in the Same Series
Below is a table of other models in the 621 Series or closely related industrial pressure sensors. These models differ in pressure range, accuracy, or output option but share similar construction and design principles.
| Model | Pressure Range | Output | Accuracy | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 621-1101 | 0–50 PSI | 0–5 VDC | ±0.75% FS | 70 × 40 × 30 | 0.16 |
| 621-1141 | 0–300 PSI | 4–20 mA | ±0.5% FS | 80 × 45 × 35 | 0.21 |
| 621-1182 | –14.7 to 100 PSI | 0–10 VDC | ±1.0% FS | 75 × 42 × 35 | 0.18 |
| 621-1221 | 0–600 PSI | 4–20 mA | ±0.5% FS | 85 × 50 × 40 | 0.24 |
| 621-1251 | 0–1000 PSI | 4–20 mA | ±0.75% FS | 90 × 55 × 45 | 0.30 |
7. Popular Models from the Same Brand
Here are five well-regarded and commonly used sensor models from the same brand, representing complementary measurement technologies and broad applicability.
| Model | Type | Key Feature | Output | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| PX90 Series Transducer | Industrial Pressure Sensor | High accuracy | 4–20 mA / 0–10 VDC | 90 × 50 × 45 | 0.32 |
| SCX Differential Sensor | Differential Pressure | Measures small ΔP across media | 4–20 mA | 80 × 40 × 30 | 0.22 |
| FTL300 Flow Sensor | Air Flow Measurement | Compact airflow monitoring | Pulse / Analog | 95 × 60 × 35 | 0.28 |
| TCR600 Temperature Probe | Temperature Measurement | High temperature range | 4–20 mA | 60 × 20 × 15 | 0.12 |
| RH600 Humidity Sensor | Humidity & Temperature | Dual measurement | Digital | 45 × 45 × 15 | 0.10 |
8. Frequently Asked Questions (FAQ)
Q1: What kind of pressure does the Honeywell 621-1201 measure?
A1: This sensor measures gauge pressure, which refers to pressure relative to ambient atmospheric pressure. It is suitable for systems where relative pressure monitoring is required for control and safety.
Q2: What output signals are provided by this sensor?
A2: The 621-1201 offers selectable analog output options, either a 4–20 mA current loop or a 0–5 VDC voltage signal, both of which are widely used in industrial control systems.
Q3: What is the accuracy specification of this model?
A3: The nominal accuracy is ±0.5% of full scale, which means the measured pressure value is tightly controlled within this tolerance across the sensor’s operating range.
Q4: What is the operating temperature range?
A4: The sensor is rated to operate from –40°C up to +125°C, allowing it to function reliably in both very cold and very hot installations.
Q5: Can this sensor be used with liquids as well as gases?
A5: Yes, it can measure pressure in air, inert gases, and non-corrosive liquids such as oils. Always confirm compatibility with the specific fluid used in your system.
Q6: What mechanical connection does the 621-1201 use?
A6: It uses a standard 1/4″ NPT male threaded connection for installation into piping or manifolds.
Q7: What protection rating does it have against dust and moisture?
A7: The sensor carries an IP67 rating, meaning it is protected against dust ingress and temporary immersion in water, which enhances reliability.
Q8: What materials are used in the housing and seals?
A8: The housing is made of stainless steel and the seals are typically Buna-N or Viton, both of which offer durability and chemical resistance in industrial applications.
Q9: How should the sensor be mounted for best performance?
A9: Tighten the threaded connection securely without over-torquing. Mount it in a location free from excessive vibration and ensure the electrical connector is protected from moisture.
Q10: What industries commonly use this type of pressure sensor?
A10: Industries such as manufacturing automation, HVAC, fluid power systems, water treatment, and mobile machinery frequently use sensors like the 621-1201 for pressure feedback and control.