Technical Review: HED8OA-20/350K14KW REXROTH Pressure Switch - Selection Guide & Specs
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Overview: Solving Hydraulic System Pressure Monitoring Challenges
The Bosch Rexroth HED8OA-20/350K14KW pressure switch (R901102716) addresses critical industrial pain points in hydraulic system monitoring and control. In applications where uncontrolled pressure spikes can lead to catastrophic equipment failure, this precision component provides reliable electrical switching when hydraulic pressure reaches preset values. Whether you're managing hydraulic systems in industrial machinery, mobile equipment, or marine applications, this pressure switch eliminates guesswork and prevents costly downtime by delivering accurate pressure monitoring with micro-switch precision.
Technical Specifications & Performance Analysis
The HED8OA-20/350K14KW represents the pinnacle of hydraulic pressure monitoring technology from Rexroth, featuring robust construction and versatile configuration options. This piston-type hydraulic pressure switch is engineered for demanding industrial environments where reliability and precision are non-negotiable.
| Specification | Value | Description |
|---|---|---|
| Model Number | R901102716 | Official Bosch Rexroth part number |
| Product Family | HED 8 OA-2X | Component series 2X design |
| Maximum Operating Pressure | 350 bar (5,076 psi) | High-pressure industrial capability |
| Available Pressure Ratings | 50, 100, 200, 250, 315 bar | Versatile configuration options |
| Switching Current Range | 1mA to 2A | Potential-free switching capability |
| Contact Function | NC/NO (Normally Closed/Normally Open) | Micro switch with dual contact options |
| Electrical Connection | Large terminal design | Easy installation and maintenance |
| Supply Voltage Range | 12-250 V AC/DC | Broad electrical compatibility |
| Connection Type | Pipeline connection | Direct hydraulic system integration |
| Response Time | <10 milliseconds | Fast-acting pressure monitoring |
| Operating Temperature | -20°C to +80°C | Wide environmental tolerance |
| Housing Material | Stainless steel/aluminum | Corrosion-resistant construction |
| IP Rating | IP65 | Dust-tight and water jet protection |
This pressure switch excels in applications requiring precise pressure monitoring for hydraulic pumps, cylinders, and valve systems. The micro-switch technology ensures reliable electrical signaling without the need for external power sources, making it ideal for safety-critical applications.
Buying Considerations: Selecting the Right Pressure Switch
When purchasing the HED8OA-20/350K14KW pressure switch or similar pressure switches, consider these critical factors:
1. Pressure Range Matching: Ensure your system's maximum operating pressure doesn't exceed 350 bar. The switch offers adjustable settings at 50, 100, 200, 250, and 315 bar - select the setting closest to your required trip point while maintaining a 20% safety margin.
2. Electrical Compatibility: Verify your control system voltage (12-250V AC/DC) matches the switch's specifications. The 1mA-2A switching range accommodates most industrial control circuits, but confirm your load requirements.
3. Hydraulic Fluid Compatibility: While designed for standard hydraulic oils, verify compatibility with specialty fluids, synthetic oils, or fire-resistant fluids used in your system.
4. Environmental Conditions: The IP65 rating provides excellent protection, but consider additional factors like vibration resistance, shock loads, and ambient temperature extremes in your application.
5. Contact Configuration: Determine whether you need Normally Closed (NC) or Normally Open (NO) contacts based on your safety and control logic requirements.
6. Installation Requirements: The pipeline connection requires proper port sizing and thread compatibility. Ensure you have the correct fittings and installation tools for your hydraulic system.
7. Maintenance Accessibility: Consider the switch's location for future calibration, testing, and potential replacement needs.
Frequently Asked Questions
Q1: What is the difference between the HED8OA-20/350K14KW and other pressure switches in the HED 8 series?
The HED8OA-20/350K14KW (R901102716) features component series 2X design with a maximum operating pressure of 350 bar and specific pressure rating options (50, 100, 200, 250, 315 bar). Other models may have different pressure ranges, connection types, or electrical specifications. Always verify the exact model number matches your requirements.
Q2: How often should this pressure switch be calibrated in industrial applications?
For critical applications, annual calibration is recommended. However, calibration frequency depends on operating conditions - high-vibration environments or systems with frequent pressure cycling may require more frequent verification. The switch maintains excellent long-term stability, but regular testing ensures continued accuracy.
Q3: Can this pressure switch be used with pneumatic systems or only hydraulic applications?
The HED8OA-20/350K14KW is specifically designed for hydraulic systems. While it could theoretically work with pneumatic applications, the design optimization for hydraulic fluids and pressure characteristics makes it unsuitable for pneumatic use. For pneumatic applications, consider dedicated pneumatic pressure switches designed for air and gas media.