Hydraulic systems are integral in various industries. From an aircraft to a simple car, a variety of applications use heavy-duty hydraulic tools. These hydraulic tools use hydraulic fluid to perform various heavy tasks.
For accuracy and precision, fluid levels in the hydraulic tools must be precise. Moreover, it should have normal or specified pressure ranges. To ensure accuracy, oil pressure sensors are used. Today, we will discuss oil pressure sensors and how they help hydraulic systems.
What is an Oil Pressure Sensor?
An oil pressure sensor is a monitoring device that measures oil pressure in hydraulic tools and displays the readings on the display system. It converts pressure ratings into electrical signals so experts can see the exact pressure values.
The purpose of the oil pressure sensor is to ensure the hydraulic fluid is at the correct operating pressure and to avoid mishaps due to high or low pressure.
Such pressure sensors are crucial in the following industries.
- Hydraulic machinery
- Industrial manufacturing systems
- Construction equipment
- Automotive engines
- Agricultural machinery
- Marine hydraulic systems
- Aerospace systems
Components of Oil Pressure
The Oil Pressure Sensor performs its fundamental tasks through the components discussed below. They all act synchronously to provide pressure measurements.
Pressure-Sensitive Element
The pressure-sensing element is the most crucial. It detects any change in pressure through its sensitivity and provides the data.
The commonly used sensing elements include:
- Strain gauges
- Piezoelectric elements
- Capacitive sensors
Diaphragm
Sensing elements comprise a more specific device or part called a diaphragm. Whenever pressure increases or decreases, the thin diaphragm membrane deforms, allowing it to measure accurate pressure values.
Electrical Circuit
The sensing elements measure, while the electrical circuit converts the pressure changes into electrical signals. Consider it as a processing tool that changes the signals.
It often sends output to:
- Pressure gauges
- Control systems
- Electronic control units (ECUs)
- Programmable logic controllers (PLCs)
Housing
Housing is another crucial component that protects the sensors from external factors, such as:
- Heat
- Moisture
- Dirt
- Vibration
- Corrosion
Since hydraulic cylinders operate in extremely harsh conditions, protection with a housing remains crucial.
Output Terminal or Connectors
Connectors transmit the signals to external devices and provide a stable communication route. Modern sensors have:
- Analog outputs
- Digital outputs
- Wireless communication
Step-by-Step Guide on How Oil Pressure Works in a Hydraulic System
Oil pressure sensors play a crucial role in the hydraulic system. Here is how exactly they work in such spaces.
Step 1: Hydraulic Pump Creates Pressure
A hydraulicA hydraulic pump generates a linear force by the movement of hydraulic fluid. Hydraulic fluid is often pressurized.
Step 2: Fluid Reaches Sensor
The pump moves the fluid through the hydraulic system to the sensor. Here, the game begins with the sensing elements and diaphragm deformation discussed below.
Step 3: Diaphragm Deforms
When the fluid reaches the sensing elements, it puts pressure on the diaphragm. As a result, the diaphragm deforms due to pressure changes.
Remember, high pressure can cause greater diaphragm deformation than low pressure.
Step 4: Sensing Element Role
The Sensing Element measures and interprets diaphragm movements. For example, different types of sensing elements work differently.
Strain gauges change electrical resistance in response to diaphragmatic movements. At the same time, piezoelectric crystals generate voltage.
Step 5: Signal Conversion
To understand and obtain the values, the signal conversion occurs from mechanical movement to electrical signals. These can be voltage- or current-based signals.
Step 6: Transfer to Monitoring Devices
The pressure readings are transmitted through the monitoring system so the experts can see the exact values.
For example, signals are transferred to the following monitoring devices.
- Gauges
- Monitoring displays
- PLC systems
- Machine control units
Step 7: Safety and Control Action
Controlled action is required when the pressure exceeds the limits and becomes unsafe. Here are a few actions that often occur:
- Warning lights turn on to alert users.
- Trigger alarms for instant alerts and actions.
- Reduce system load to avoid mishap.
- Shut down machinery automatically as a safety breaker system.
Types of Oil Pressure Sensors
There are five fundamental types of oil pressure sensors, distinguished by their working mechanisms and sensing options. These are here.
Mechanical Pressure Sensors
Mechanical pressure sensors are the most basic tools for detecting changes in pressure due to movement. They are cost-effective and commonly used in older hydraulic machinery.
Electronic Pressure Sensors
Electronic pressure sensors are modern solutions that provide instant measurements and detailed pressure change data. They detect pressure changes and convert them into electrical signals for display on the screens.
Strain Gauge Pressure Sensors
Strain gauges are specialized tools installed near diaphragms. Pressure deforms the diaphragm and changes the resistance of the strain gauges. It interprets the values.
Piezoelectric Pressure Sensors
Piezoelectric pressure sensors are modern tools that use voltage-based changes to detect pressure. The pressure sensors change the voltage in response to pressure changes and provide the readings.
Capacitive Pressure Sensors
Unlike the above systems, capacitive pressure sensors use a change in capacitance as their fundamental mechanism for pressure detection. They are sensitive and precise in the pressure measurements.
Why is it Necessary to Have Oil Pressure Sensors in Hydraulic Systems?
You might want to skip the oil pressure sensors from the hydraulic systems, but they are crucial. Without them, several mishaps occur.
Here are a few reasons why they are necessary.
Prevent Equipment Damage
Hydraulic Systems involve equipment ranging from small to large, depending on the industry. They operate under high pressure and harsh conditions. Exceeding the required limits without a pressure-sensing system can damage the following components.
- Pumps
- Hoses
- Valves
- Seals
- Cylinders
Pressure Sensors are primary tools that detect high pressure and prevent these damages.
Improve Safety
High-pressure failures damage the system and pose a risk to humans. During hydraulic operations, injuries or even fatalities may occur.
Pressure Sensors detect timely pressure and avoid:
- Hose bursts
- Fluid leaks
- Equipment explosions
- Sudden machine failure
Enhance System Efficiency
Do you know why hydraulic system efficiency drops exponentially? It is due to constant overpressure that internally damages components and reduces efficiency.
Correct pressure measured with the oil pressure sensors can improve:
- Machine performance
- Energy efficiency
- Productivity
Therefore, oil pressure sensors play a crucial role in the accuracy and system efficiency.
Enable Automation
Advancements in technology and the implementation of artificial intelligence have made productivity smoother and transformed processes from manual to automated. Similarly, pressure measurements should be automatic, which oil pressure sensors already provide.
Oil Pressure Sensors are often compatible with your modern machinery and provide the following features.
- Automated pressure regulation
- Smart machine control
- Remote monitoring systems
Reduce Costs
Excessive pressure damages internal and external parts of your machinery. Recurring costs with low efficiency can be your headache.
Oil pressure sensors reduce it by decreasing the:
- Repair costs
- Energy consumption
- Equipment replacement expenses
Troubleshooting and Maintenance of Oil Pressure Sensor
| Problem | Possible Cause | Symptoms | Solution |
| Fluctuating Pressure Readings | Loose wiring or damaged connector | Pressure gauge moves up and down irregularly | Inspect and tighten electrical connections |
| No Pressure Reading | Faulty sensor or broken circuit | Gauge shows zero pressure | Test the sensor and replace if necessary |
| False Warning Light | Sensor calibration issue | Warning light turns on even when pressure is normal | Recalibrate or replace the sensor |
| Low Pressure Reading | Hydraulic fluid leak or low oil level | Weak hydraulic performance | Check for leaks and refill hydraulic oil |
| High Pressure Reading | Blocked valve or clogged filter | Excessive system pressure alarms | Clean filters and inspect valves |
| Delayed Sensor Response | Dirty or contaminated hydraulic fluid | Slow pressure updates on display | Replace hydraulic fluid and filters |
| Sensor Overheating | Exposure to extreme temperatures | Sensor malfunction or shutdown | Improve cooling and use heat-resistant sensors |
| Intermittent Signal Loss | Corroded terminals or damaged wiring | Pressure signal cuts in and out | Clean terminals and repair wiring |
FAQs
- What does an oil pressure sensor do in the hydraulic system?
An oil pressure sensor detects pressure changes in hydraulic systems and provides accurate pressure measurements.
- What if the oil pressure sensor fails to measure pressure?
If your pressure sensor fails to perform or measure pressure, it may provide incorrect readings, trigger false warnings, reduce hydraulic efficiency, or fail to detect dangerous pressure conditions. Therefore, you should get it repaired to avoid mishaps.
- Do hydraulic systems work without the oil pressure sensors?
Yes. Hydraulic systems are normally designed to work without the oil pressure sensors. But modern systems have built-in oil pressure sensors and rely on them for accurate task completion and safety.
- When should you inspect and maintain the oil pressure sensor?
You should inspect and maintain your oil pressure sensors during hydraulic maintenance. Moreover, if you feel any glitches or pressure errors, then inspection is a must.
- What is the difference between an oil pressure sensor and a pressure switch?
The oil pressure sensor continuously detects pressure changes without thresholds. On the other hand, a switch activates when the pressure change reaches the preset value.
Conclusion
Hydraulic Systems heavily rely on oil pressure sensors to monitor pressure changes and provide pressure readings. In the event of hydraulic failures, experts can prevent long-term accidents. When choosing a hydraulic fluid sensor, rely on ratings and quality, and focus on longevity.
If you are looking for top-notch models with highly accurate pressure-sensing capabilities, contact Sendo-sensor. We have some of the top-notch models that measure accurate pressure changes in hydraulic systems. Contact our experts right away!