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Honeywell 621-2100 Pressure Sensor — Detailed Product Description, Specifications, Applications, Advantages, Related Models, Popular Brand Models, and FAQ
1. Product Name and Introduction
Product Name: Honeywell 621-2100
The Honeywell 621-2100 is an industrial pressure sensor designed to deliver accurate and dependable pressure measurement for a wide range of applications. Built for rugged environments, it combines precision sensing elements with a robust mechanical design that can withstand vibration, temperature fluctuations, moisture, and shock. This model is engineered for long service life and consistent performance in control systems, monitoring platforms, automation equipment, and process instrumentation.
The 621-2100 model is part of a product family known for its ability to integrate easily into control loops, PLC systems, and data acquisition units, providing stable analog output that enables effective regulation of pressure-dependent processes.
2. Brand and Series
Brand: Honeywell
Series: 621 Series Industrial Pressure Sensors
The 621 Series comprises a line of compact, rugged pressure sensors designed for industrial environments. This series emphasizes wide operating temperature ranges, selectable output options, solid accuracy, and housing construction that suits many fluid and gas pressure monitoring scenarios.
3. Detailed Specifications
| Parameter | Specification |
|---|---|
| Model | 621-2100 |
| Pressure Type | Gauge pressure |
| Pressure Range | 0–1000 PSI |
| Accuracy | ±0.5% of Full Scale (FS) |
| Output Signal | 4–20 mA or 0–10 VDC (user selectable) |
| Supply Voltage | 10–30 VDC |
| Response Time | ≤ 5 ms |
| Temperature Range | –40°C to +125°C |
| Media Compatibility | Air, inert gases, hydraulic oil |
| Mechanical Connection | 1/4″ NPT Male |
| Electrical Connector | Industrial 3-pin connector |
| Dimensions (L × W × H) | 95 × 50 × 40 mm |
| Weight | 0.31 kg |
| Enclosure Protection | IP67 |
| Vibration Resistance | 10 g |
| Shock Resistance | 50 g |
| Housing Material | Stainless steel |
| Seal Material | Buna-N or Viton |
4. Product Applications
The Honeywell 621-2100 is designed to deliver pressure measurement and monitoring in challenging environments. Common application scenarios include:
Industrial Automation
Used to measure pneumatic and hydraulic pressures in assembly lines, robotic equipment, and factory automation systems. Reliable pressure feedback enables precise control of actuators, valves, and cylinders.
Process Control Systems
Installed in manufacturing plants to maintain proper pressure in tanks, reactors, and pipelines. The sensor provides critical feedback for process regulation and safety interlock systems.
Mobile and Heavy Machinery
Used on construction and agricultural machinery to monitor hydraulic system pressure. Accurate readings help protect pumps, cylinders, and hoses from damage due to overpressure.
HVAC and Refrigeration
Employed in heating, ventilation, air conditioning, and refrigeration systems to monitor refrigerant pressure and airflow pressure differences. Ensures optimized system performance and protects compressors.
Water Treatment and Pump Control
Used in municipal water systems and wastewater treatment plants to measure pressure in distribution lines and pumps. Supports efficient pumping operations and protects against dry-run conditions.
Energy and Power Systems
Applied in power generation and distribution equipment for pressure monitoring in lubricating oil systems, steam lines, and auxiliary hydraulic circuits.
5. Product Advantages
The 621-2100 offers a combination of performance, durability, and integration flexibility that benefits engineers and system designers in the field.
High Accuracy and Repeatability
With ±0.5% full-scale accuracy, the sensor provides dependable pressure readings that help maintain precise control and reduce variation in process outputs.
Selectable Output
The ability to select between 4–20 mA current loop or 0–10 VDC voltage output enables compatibility with a wide range of control systems without additional signal conversion.
Robust Mechanical Design
Stainless steel housing and strong internal components ensure resistance to mechanical stress, vibration, and environmental impacts.
Wide Operating Temperature Range
Capable of operating from –40°C to +125°C, making it suitable for indoor and outdoor environments, as well as industrial enclosures exposed to heat.
Environmental Protection
An IP67 enclosure rating protects the sensor from dust ingress and temporary immersion in water, increasing reliability in damp or dusty environments.
Compact and Easy to Install
The relatively small footprint and standard 1/4″ NPT threaded connection make it easy to mount in existing systems without extensive modification.
6. Related Models in the Same Series
Below are five models from the 621 Series or closely related pressure sensors. These models offer similar performance characteristics but may differ in pressure range, output options, or specific features.
| Model | Pressure Range | Output | Accuracy | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 621-1100 | 0–50 PSI | 0–5 VDC | ±0.75% FS | 70 × 40 × 30 | 0.16 |
| 621-1180 | 0–100 PSI | 4–20 mA | ±0.5 % FS | 70 × 40 × 30 | 0.15 |
| 621-1201 | 0–200 PSI | 4–20 mA | ±0.5 % FS | 80 × 45 × 35 | 0.20 |
| 621-1500 | 0–500 PSI | 0–10 VDC | ±0.5 % FS | 90 × 50 × 40 | 0.28 |
| 621-2500 | 0–1500 PSI | 4–20 mA | ±0.5 % FS | 95 × 55 × 45 | 0.35 |
7. Popular Models from the Same Brand
Here are five other widely used sensor models from the same brand. They represent different measurement types and are chosen for their performance in industrial applications.
| Model | Type | Key Characteristic | Output | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| PX90 Pressure Transducer | Pressure Transducer | High accuracy industrial grade | 4–20 mA / 0–10 V | 90 × 50 × 45 | 0.32 |
| SCX Differential Sensor | Differential Pressure Sensor | Differential measurement | 4–20 mA | 80 × 40 × 30 | 0.22 |
| FTL300 Flow Sensor | Airflow Measurement Sensor | Measures airflow rate | Pulse / Analog | 95 × 60 × 35 | 0.28 |
| TCR600 Temperature Probe | Temperature Sensor | Wide temperature range sensing | 4–20 mA | 60 × 20 × 15 | 0.12 |
| RH600 Humidity Sensor | Humidity & Temperature | Dual humidity and temperature | Digital | 45 × 45 × 15 | 0.10 |
8. Frequently Asked Questions (FAQ)
Q1: What does the Honeywell 621-2100 measure?
A1: The 621-2100 measures gauge pressure, giving a reading relative to atmospheric pressure. It is suitable for systems where monitoring pressure above ambient is needed.
Q2: What output options are available?
A2: The sensor supports selectable analog outputs: 4–20 mA current loop or 0–10 VDC voltage output, depending on system requirements.
Q3: What is the pressure range for this model?
A3: The standard configuration measures pressure from 0 up to 1000 PSI. Different calibration options may offer variations.
Q4: How accurate is the 621-2100?
A4: This model has an accuracy of ±0.5% of full scale, which means the measured value will be within this range of the actual pressure.
Q5: Can the sensor be used outdoors?
A5: Yes. With a wide operating temperature range and IP67 protection, it is suitable for outdoor use with appropriate mounting.
Q6: What media can be measured?
A6: The sensor is designed for air, inert gases, and many non-corrosive hydraulic fluids. Verify material compatibility for specific fluids.
Q7: What connection types does the sensor use?
A7: It utilizes a 1/4″ NPT male mechanical connection and an industry-standard 3-pin electrical connector.
Q8: Is periodic calibration needed?
A8: Factory calibration ensures accuracy at shipment. Periodic calibration may be recommended depending on application criticality.
Q9: How should it be installed for best results?
A9: Install on a stable surface, avoid excessive vibration, use appropriate sealant on threaded connections, and ensure electrical connections are protected from moisture.
Q10: What industries typically use this sensor?
A10: Industries such as manufacturing automation, HVAC systems, water treatment, mobile machinery, and general process control commonly use this sensor to monitor system pressures.