KUS S3 Fuel and Water Tank Level Sensor (150mm) Instruction Manual

1. Product Overview

The KUS S3 Fuel and Water Tank Level Sensor is designed for accurate measurement of liquid levels in tanks. Constructed from durable SUS316 stainless steel, it offers excellent corrosion resistance, making it suitable for marine and other demanding applications. This sensor operates on the principle of a magnetic field to control a reed on-off switch, ensuring a long lifespan and reliable performance.

Key Features:

• Length: 150mm
• Signal Output: 0-190ohm
• Assembly: BSP 1 1/4" thread twist-in, or NPT thread twist-in
• Resolution: 21mm
• Material: SUS316 Stainless Steel
• Protection Rank: IP67
• Operating Temperature: -40°C to +85°C

Figure 1: KUS S3 Fuel and Water Tank Level Sensor (150mm) with wiring.

For a detailed overview of the product and its features, please watch the following video:

2. Setup and Installation

Proper installation is crucial for accurate readings and long-term performance. Follow these steps carefully:

1. Prepare the Tank: Ensure the tank is empty and clean before beginning installation.
2. Determine Mounting Location: Select a flat surface on the top of the tank for mounting.
3. Mark and Drill: Use the provided gasket as a template to mark the center hole and screw holes. Drill the center hole with a 40mm opener. Drill smaller pilot holes for the screws.
4. Measure Tank Depth: Measure the internal depth of your tank from the mounting surface to the bottom. Ensure at least 1 inch of clearance between the float retaining collar and the tank bottom. The sensor length should be appropriate for your tank depth.
5. Install Gasket and Sensor: Place the gasket over the drilled holes. Insert the sensor into the tank, aligning the screw holes.
6. Secure the Sensor: Fasten the screws in a sequence (e.g., diagonally) to ensure even pressure. Do not overtighten to prevent damage and ensure a leak-free seal.

For a visual guide on installation, please refer to the following video:

3. Wiring and Operation

The KUS S3 sensor provides a 0-190ohm resistance output. It can be connected to compatible fuel or water level gauges that accept this signal range.

Wiring Instructions:

• Connect the sensor's signal wire (typically blue or orange) to the gauge's signal input.
• Connect the sensor's ground wire (typically black) to the battery negative terminal and the gauge's ground input.
• Connect the gauge's positive power input (typically red) to the battery positive terminal.
• If your gauge has a backlight, connect its positive wire (typically orange) to a switched 12V or 24V positive source.

Once wired, the sensor's float mechanism will move with the liquid level, and the connected gauge will display the corresponding level. The gauge provides a smooth and consistent sweep for accurate readings.

4. Maintenance

The KUS S3 sensor is designed for minimal maintenance due to its robust SUS316 stainless steel construction. However, periodic checks can ensure optimal performance:

• Visual Inspection: Periodically inspect the sensor for any physical damage, corrosion, or debris accumulation, especially if used in harsh environments.
• Cleaning: If necessary, gently clean the sensor rod and float with a soft cloth and appropriate cleaning solution for stainless steel. Avoid abrasive materials that could scratch the surface.
• Connection Check: Ensure all electrical connections remain secure and free from corrosion.

5. Troubleshooting

If you encounter issues with your KUS S3 sensor, consider the following:

• Inaccurate Readings:
  • Check for proper sensor length relative to tank depth.
  • Verify electrical connections are secure and correctly wired.
  • Ensure the float moves freely along the sensor rod without obstruction.
  • Confirm the connected gauge is compatible with a 0-190ohm resistance signal.
• No Reading:
  • Check power supply to the gauge and sensor.
  • Inspect wiring for breaks or loose connections.
  • Test the sensor's resistance output directly with a multimeter if possible.
• Leaks at Mounting Point:
  • Ensure the gasket is properly seated and undamaged.
  • Verify screws are tightened evenly, but not excessively.

For further assistance, contact KUS customer support.

6. Specifications

7. Warranty and Support

For warranty information and technical support, please refer to the official KUS website or contact your authorized dealer. Keep your purchase receipt for warranty claims.

Contact Information:

• KUS Americas Inc. Store on Amazon