Selection Guide for Mobile In-Cylinder Linear Position Sensors

Here’s a Selection Guide for Mobile In-Cylinder Linear Position Sensors, designed to help you choose the right sensor for mobile applications like agriculture, construction, and forestry equipment:

Key Factors for Sensor Selection

1. Sensor Technology Types
Magnetostrictive Sensors
Pros: High precision, non-contact, long lifespan.
Cons: Higher cost.
Applications: Hydraulic cylinders in construction equipment.
Inductive Sensors
Pros: Durable, cost-effective.
Cons: Lower resolution compared to magnetostrictive.
Applications: Simple position feedback where high precision is not critical.
Potentiometric Sensors
Pros: Simple, low cost.
Cons: Contact-based wear, limited lifespan.
Applications: Low-budget or basic systems.
Hall Effect Sensors
Pros: Compact, no mechanical wear.
Cons: Moderate precision.
Applications: Steering and positioning systems.

2. Operating Environment Considerations

Temperature Range
Ensure the sensor can withstand operating and peak temperatures typical for mobile equipment.
Shock and Vibration
Choose sensors rated for high G-forces if used in construction or forestry machines.
Ingress Protection (IP Rating)
Minimum IP67 or IP69K for outdoor and mobile applications to handle dust, water, and pressure washdowns.

3. Sensor Design and Mounting Options

Rod-Style Sensors
Installed inside the hydraulic cylinder.
Applications: High-load systems in heavy equipment.
Embedded Sensors
Compact and integrated into the cylinder.
Applications: Space-constrained designs.
External Sensors
Mounted outside the cylinder but connected to the internal piston via magnetic coupling or linkages.
Applications: Retrofit or specialized systems.

4. Sensor Signal Output

Analog Output (Voltage/Current)
Suitable for legacy systems and simple controls.
Digital Output (CANbus, PWM, SSI)
Preferred for modern machinery with advanced controllers.
Example: CANbus for multiplexed systems in tractors.

5. Performance Specifications

Resolution
Higher precision is required for fine control of implements or steering.
Linearity and Repeatability
Ensure tight tolerances for critical positioning systems.
Measurement Range
Match the stroke length of the hydraulic cylinder.

6. Special Features

Redundant Sensors
Use redundant sensing in safety-critical systems (e.g., steering or load control).
Non-Contact Technology
Magnetostrictive or inductive for longer service life.
Diagnostic Feedback
Advanced sensors with fault detection capabilities.

7. Supplier and Compatibility

OEM Compatibility
Check compatibility with cylinder brands or manufacturers like Bobcat, John Deere, etc.
Supplier Reliability
Choose reputable brands such as:
MTS Sensors (Temposonics): Known for high-precision magnetostrictive sensors.
Rota Engineering: Specializes in ruggedized sensors.
Parker Hannifin: Offers sensors integrated with their hydraulic systems.