T/LL400 Capacitance Oil or Coolant Liquid Level Sensor (Voltage output)

With configurable output options including 0–10 VDC, 0–5 VDC and 0.5–4.5 VDC, the sensor can be tailored to meet the specific requirements of OEM and industrial applications. Its robust design and solid-state sensing technology ensure long-term reliability without moving parts, helping reduce maintenance while delivering accurate and repeatable level measurements. If you need a Current output such as 4-20mA please check the T/LL401 version.

Continuous Oil and Coolant Level Monitoring

Unlike traditional switch-based devices, the T/LL400 provides continuous fluid level measurement, enabling operators and control systems to monitor oil and coolant levels in real time. This helps improve maintenance planning, reduce downtime and protect critical equipment from damage caused by low fluid levels.

Accurate Fluid Level Measurement Across Extreme Temperatures

Designed for demanding environments, the T/LL400 delivers dependable performance across an extended operating temperature range of -40°C to +125°C (-40°F to +257°F). The sensor maintains excellent accuracy and repeatability even when exposed to wide temperature fluctuations commonly found in engines, transmissions, hydraulic systems and power generation equipment.

Protect Equipment with Integrated Low-Level Alarm

The integrated connector version of the T/LL400 includes a programmable low-level alarm output as standard. Factory configured to activate at 12.5% fluid level, the sink-to-ground alarm provides early warning of low oil or coolant conditions. Alternative alarm points can also be specified to suit individual application requirements, helping prevent costly system failures and unplanned downtime.

Compact Sensor Design for Restricted Installation Spaces

The T/LL400 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 accommodate a variety of tank depths while maintaining high measurement accuracy.

This compact footprint makes the sensor particularly well suited to modern equipment designs where installation space is limited.

Flexible Electrical Connection Options

To simplify integration into OEM and aftermarket systems, the T/LL400 is available with either:

• Integral Packard-style connector
• Integral Deutsch DT04-4P connector
• Flying lead assembly with the option of adding customer-specified connector. There are options for the leads to exit the cable cap upwards or to the side to reduce height.

These options provide flexibility when integrating the sensor into new or existing electrical architectures.

Oil and Coolant Level Sensor Applications

The T/LL400 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

Why Choose the T/LL400 Oil and Coolant Level Sensor?

The T/LL400 combines continuous level measurement, compact packaging and robust environmental performance in a single solution. Designed for accurate monitoring of both oil and coolant, it provides equipment manufacturers and system integrators with a reliable method of protecting critical assets, improving maintenance visibility and enhancing overall system reliability.

Key Features

• Continuous oil and coolant level measurement
• Suitable for 9-36 Vdc power supplies
• Capacitive sensing technology with no moving parts
• Configurable analogue output within 0–10 VDC range
• Optional 0–5 VDC and 0.5–4.5 VDC outputs (others can be requested)
• 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
• 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