The IFM LI5133 is a capacitive point-level sensor designed for industrial liquid-level detection. It is intended for coolants, cleaning agents, lubricants and hydraulic oils. The sensor provides two digital outputs for reliable level-status monitoring. Its 481 mm probe enables installation in deeper tanks and reservoirs. The LI5133 combines compact electronic level detection with IO-Link connectivity for modern automation systems.
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The LI5133 uses capacitive sensing to detect the presence or absence of media at the defined level. Its 481 mm probe makes it suitable for larger reservoirs and process tanks. The sensor is particularly suited to water-based and oil-based industrial fluids. A dielectric constant above 1.8 is supported for the intended media range. This makes the sensor useful for coolant, lubricant and hydraulic-fluid monitoring.
The sensor is designed for applications involving coolants, cleaning agents, lubricants and hydraulic oils. It can be integrated into automated machines where reliable point-level information is required. Its electronic design eliminates the need for mechanical level switches. The sensor can support high/low level detection depending on installation and parameterisation. It is therefore suitable for automated refill and dry-run prevention systems.
The LI5133 operates over a broad 9.6–35 V DC supply range. IO-Link operation uses an 18–30 V DC supply range for parameterised communication. Its two digital outputs provide level-status signals for machine control. Reverse polarity protection improves installation reliability. The short power-on delay supports responsive level detection.
481 mm probe length
Capacitive level sensing
Two digital outputs
9.6–35 V DC supply
IO-Link communication
18–30 V DC IO-Link operation
Suitable for liquids
Dielectric constant >1.8
PNP/NPN electronic design
Reverse polarity protection
Short power-on delay
Industrial fluid compatibility
Coolant tanks
Lubricant reservoirs
Hydraulic oil systems
Cleaning-fluid tanks
Machine-tool reservoirs
Automatic refill systems
Low-level warning systems
Pump dry-run protection
The LI5133 can be installed in tanks and reservoirs where point-level detection is required. Its long probe provides useful installation depth for larger fluid containers. The sensor can be integrated into machine control systems through switching outputs or IO-Link. Parameterisation through IO-Link simplifies configuration and diagnostics. This makes it suitable for automated fluid-management systems.
Electronic capacitive sensing avoids moving mechanical switching elements. The sensor can therefore provide repeatable level-status detection in industrial fluid applications. Its reverse-polarity protection helps reduce the risk of wiring-related damage. The design is intended for continuous machine monitoring rather than manual level inspection. It is well suited to automated maintenance and replenishment strategies.
| Specification | LI5133 |
|---|---|
| Product type | Point-level sensor |
| Product code | LI0481--K-00KQPKG/US |
| Sensing principle | Capacitive |
| Probe length | 481 mm |
| Number of outputs | 2 digital |
| Application | Point-level detection |
| Media | Liquids |
| Recommended media | Water, coolants, oils, lubricants |
| Dielectric constant | >1.8 |
| Operating voltage | 9.6–35 V DC |
| IO-Link supply | 18–30 V DC |
| Current consumption | <15 mA |
| Protection class | III |
| Reverse polarity | Yes |
| Power-on delay | <1 s |
| Output type | Digital |
| Electrical interface | IO-Link / switching outputs |
| Level detection | Capacitive |
| Probe construction | Industrial level probe |
| Installation | Tank/reservoir |
| Typical use | Coolants |
| Typical use 2 | Hydraulic oils |
| Typical use 3 | Lubricants |
| Typical use 4 | Cleaning agents |
| Communication | IO-Link |
| Medium temperature | -25…85 °C |
| Process pressure | 0.5 bar |
| Vacuum rating | -500 mbar |
| Product family | LI level sensors |
| Mounting | Tank level installation |
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