In modern hydraulic and technical installations, the parameters of liquid level sensors play a key role in ensuring the reliable operation of the system. As a market leader in installation solutions, we at Onninen understand perfectly how crucial it is to select the right devices for specific working conditions. Our many years of experience in distributing installation solutions show that professional installers need reliable information about technical parameters to make optimal choices.
From our assortment, we recommend level sensors from renowned manufacturers, which are characterized by high precision and reliability. These devices are used in a wide range of applications - from heating systems to sanitary installations, where monitoring the liquid level is crucial for safe operation.
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Measurement range and accuracy - fundamental technical parameters
The most important parameter of any level sensor is its measurement range, which defines the minimum and maximum height of liquid that the device can monitor. In Onninen's assortment, you will find sensors with varying ranges - from devices for small household tanks to industrial solutions with a range of several meters.
The accuracy of measurement is the second key parameter, most often expressed in percentage of full scale output (FSO) or in absolute units. The professional sensors offered in our network achieve an accuracy level of 0.5% FSO, making them suitable for the most demanding installation applications.
Long-term stability of measurements
A particularly important parameter in industrial applications is the long-term stability of measurement. The highest quality devices from our offer are characterized by stability at the level of 0.2% per year, which guarantees reliable operation for years of use without the need for frequent recalibration.
| Sensor type | Typical measurement range | Accuracy | Application |
|---|---|---|---|
| Hydrostatic | 0.1-10 mH2O | ±0.5% FSO | Open and closed tanks |
| Ultrasonic | 0.3-20 m | 1% FSO | Non-contact installations |
| Float | 0.06-5 m | ±5 mm | Alarm systems |
Environmental parameters and resistance to working conditions
Operating temperature is a critical parameter when selecting sensors for various applications. Liquid temperatures can significantly affect the operation of the device - standard sensors from our offer operate in the range from -20°C to +80°C, while specialized models withstand temperatures up to +120°C.
Resistance to pressure and aggressive media
- Nominal pressure - defines the maximum operating pressure, typically up to 25 bar
- Destructive pressure - the threshold value, beyond which permanent damage occurs
- Chemical resistance - crucial when working with aggressive media
- IP protection class - typically IP68 for water applications
Professional pumping systems require sensors resistant to various operating conditions. For this reason, we offer devices made of acid-resistant steel, polypropylenes, and Teflon, tailored to the specific requirements of installations.
Electrical parameters and output signals
Supply voltage is a basic electrical parameter that must be compatible with the available infrastructure. Most sensors in our assortment operate with a supply voltage of 8-32V DC, which ensures versatility of applications and compatibility with various control systems.
Types of output signals
Modern sensors offer various output signals tailored to the requirements of specific installations:
- Analog signal 4-20mA - industrial standard providing high resistance to interference
- Voltage output 0-10V - popular in building automation systems
- Relay contacts - for direct control of actuating devices
- Digital interface - for advanced monitoring systems
As part of our comprehensive offer of electrical accessories for pumps, you will also find controllers and relays compatible with various types of level sensors.
Response time and measurement dynamics
The response time of the sensor determines the speed of the system's reaction to changes in liquid level. For applications requiring quick response, such as dry run protection for pumps, a response time of less than 1 second is crucial. Our sensors are characterized by very short response times, making them ideal for dynamic installation systems.
Hysteresis and signal stability
A parameter often overlooked but extremely important is the switching hysteresis. It defines the difference in levels between the sensor's activation and deactivation, preventing unstable switching with slight fluctuations in liquid level. The professional sensors from our offer have adjustable hysteresis, allowing for optimal adaptation to the specifics of the installation.
Materials and operational durability
The material of construction directly affects the durability and areas of application of the sensor. In Onninen's assortment, devices made of various materials are available:
- Stainless steel - universal application, high mechanical resistance
- Polypropylene (PP) - chemical resistance, lower price
- Teflon (PTFE) - highest chemical resistance
- Technical ceramics - for applications with the highest requirements
Ultrasonically welded housings guarantee complete tightness, which is particularly important in underground installations and those exposed to high humidity. Our sensors have EMC quality certificates and, in many cases, ATEX certificates for explosion hazard zones.
Mounting method and installation requirements
The mounting method significantly affects the functionality of the sensor and ease of installation. In our offer, you will find solutions tailored to various mounting requirements:
- Vertical mounting - for tanks with limited side space
- Side mounting - facilitates servicing without emptying the tank
- Top mounting - for non-contact sensors
- Cable mounting - universal solution with adjustable depth
Length of cables and connections
The length of the signal cable is a parameter often determining the possibility of installation. Standard sensors are equipped with cables 1-5 meters long, but versions with 50-meter cables are also available, significantly expanding mounting possibilities in large installations.
Frequently asked questions
What measurement range should I choose for the level sensor?
The measurement range should be adjusted to the height of the tank with a 20-30% reserve. For tanks with a height of 2 meters, we recommend sensors with a range of at least 2.5 meters. This allows for a certain reserve and prevents overloads when fully filled.
Which sensor technology is the most reliable?
Hydrostatic sensors offer the highest reliability in long-term operation. This technology is less sensitive to contamination and weather conditions than ultrasonic solutions. For applications in clean media, capacitive sensors are also a good choice.
How often should level sensors be calibrated?
High-quality sensors require calibration every 12-24 months. The frequency depends on working conditions - in aggressive media, calibration may be needed more often. Modern devices have autocalibration functions that greatly facilitate maintenance.
What is the standard supply voltage for level sensors?
The standard is 24V DC, with an operating range of 8-32V DC. This solution ensures compatibility with most industrial and building automation systems. Versions powered by 230V AC are also available for simple applications.
Do level sensors require special certifications?
In explosion hazard zones, an ATEX certificate is required. For food applications, FDA or similar certifications are needed. In standard installations, basic CE certificates and compliance with the EMC directive ensuring safe operation are sufficient.
What IP protection class is required for level sensors?
Minimum IP67 for outdoor installations, IP68 for underwater applications. The IP68 rating guarantees complete protection against dust and total security during prolonged immersion. This is the standard for professional liquid level sensors.
Professional solutions with a quality guarantee
The appropriate selection of liquid level sensor parameters is an investment in the reliability of the entire installation. From our many years of experience in distributing installation solutions, it follows that the key to success is not only knowledge of technical parameters but also the ability to adapt them to the specific requirements of the application.
In the Onninen branch network across Poland, we offer comprehensive technical support in selecting level sensors. Our specialists will help you choose optimal parameters, taking into account the specifics of the installation, environmental conditions, and operational requirements. With a wide range of products from renowned manufacturers, we guarantee the availability of solutions from basic household applications to advanced industrial systems.
Every sensor from our offer undergoes quality control and is covered by a full manufacturer's warranty. This means certainty of investment and peace of mind during years of use. Professional installers choose Onninen not only for the quality of products but also for the comprehensiveness of services and the technical availability of our experts.