T/LL401 Capacitance Liquid Level Sensor for Oil or Coolant (Current output)
The T/LL401 4-20mA Oil or Coolant Level Sensor is a compact capacitive sensor designed to provide continuous and accurate fluid level monitoring in demanding industrial and mobile equipment applications. Suitable for both oil and coolant level measurement, the sensor is commonly used in engine oil sumps, hydraulic reservoirs, transmission systems, coolant tanks and expansion bottles. Delivering a configurable current output within the 0–20 mA range, typically specified as 4–20 mA, the T/LL401 provides reliable real-time level data for seamless integration with PLCs, engine control units, telematics systems and industrial monitoring equipment. If you need a Voltage output such as 0-5Vdc please check our T/LL400 version.
With configurable current output options to suit individual application requirements, the sensor offers precise fluid level feedback across the full measurement range. Its robust solid-state design contains no moving parts, helping to improve reliability, minimise maintenance requirements and deliver accurate, repeatable measurements throughout the product’s service life.
The integrated connector version of the T/LL401 includes a programmable low-level alarm output as standard. Factory configured to activate at 12.5% fluid level, the sink-to-ground alarm provides an early warning of low oil or coolant conditions. An alternative alarm point can be specified to meet individual application requirements, helping prevent costly equipment damage and unplanned shutdowns.
Designed for use in demanding environments, the T/LL401 delivers dependable performance across an extended operating temperature range of -40°C to +125°C (-40°F to +257°F).
The T/LL401 features a slim vertically mounted design that occupies minimal space within the tank or reservoir. Available in lengths ranging from 80 mm to 300 mm, the sensor can be tailored to suit a variety of tank depths whilst maintaining excellent measurement performance.
Need Help Selecting the Right Sensor?
Contact the Rochester Sensors team for assistance specifying requirements for your application. Please email a completed specification sheet with application details to help us respond accurately.
Technical Data Sheet
Technical Data Sheet
TLL401 – Capacitance Oil and Coolant Level sensor – Technical Data Sheet R1
Specification Sheet
Specification Sheet
Typical Industries
Typical Industries
- Generator sets and standby power
- Construction equipment
- Agricultural machinery
- Commercial vehicles
- Industrial engines
- Hydraulic power units
- Fluid storage and process tanks
- Process equipment
- Building Monitoring Systems (BMS)
Key Features
Key Features
- Continuous oil and coolant level measurement
- Suitable for 9-36 Vdc power supplies
- Capacitive sensing technology with no moving parts
- Configurable current output from 0–20 mA
- Typical industry-standard 4–20 mA output option
- Operating temperature range from -40°C to +125°C
- Compact vertical mounting design
- Sensor lengths available from 80 mm to 300 mm
- Integral connector or flying lead options
- Factory programmable low-level alarm output
- Suitable for engine oil, hydraulic oil, transmission oil and coolant applications
- Ideal for OEM, industrial, power generation and off-highway equipment
Typical Applications
Typical Applications
The T/LL401 is suitable for a wide range of fluid level monitoring applications, including:
- Engine oil sumps
- Hydraulic oil reservoirs
- Transmission oil systems
- Engine coolant tanks
- Coolant expansion bottles and tanks
- Generator set cooling systems
- Construction and agricultural machinery
- Commercial vehicles
- Industrial lubrication systems
- Power generation equipment
- Stationary industrial equipment
- Remote monitoring and telematics systems
FAQ
FAQ
What fluids can the T/LL401 measure?
The sensor is designed for oil and coolant level measurement, including engine oil, transmission oil, hydraulic oil and coolant mixtures.
What output signal does the T/LL401 provide?
The T/LL401 provides a configurable current output within the 0-20mA range, typically requested and supplied as 4-20mA.
What is the operating temperature range?
The sensor operates from -40°C to +125°C.
Can the the T/LL401 be mounted at an angle?
Enquire online
Industry
Power generation
Construction Equipment
Defence
Tanks / Fuel
Specialist Vehicles
