KUS DN85mm White Tachometer 0-4000rpm for Diesel Engine

1. Introduction

This instruction manual provides essential information for the proper installation, operation, and maintenance of your KUS DN85mm White Tachometer. Designed for diesel engines, this instrument accurately displays engine revolutions per minute (RPM) and features a robust, waterproof construction for reliable performance in various environments. Please read this manual thoroughly before installation and use.

2. Product Overview

Image 1: KUS DN85mm White Tachometer (Model CMHB-WS-4KL)

The KUS DN85mm White Tachometer is engineered to provide precise engine RPM readings. It operates on a moving-magnet principle, ensuring high endurance and resistance to vibration. Key features include:

• Indicating Range: 0-4000 RPM
• Operating Voltage: 12V/24V DC
• Installation Dimension: 85mm (DN85mm)
• Protection Rank: IP67 (Fully waterproof)
• Material: 316 Stainless steel bezel with curved glass, plastic housing
• Features: Excellent anti-fogging function, red and yellow dual-color background light options, digital hour meter.

3. Setup and Installation

Proper installation is crucial for the accurate and reliable operation of your tachometer. It is recommended that installation be performed by a qualified technician.

3.1 Mounting

1. Ensure the mounting surface is flat and clean.
2. Cut a circular hole with a diameter of 85mm (DN85mm) in the desired mounting location.
3. Insert the tachometer into the hole.
4. Secure the tachometer using the provided mounting bracket and nuts from the rear. Tighten securely to prevent movement.

3.2 Wiring Connections

The tachometer uses a multi-plug socket for convenient wiring. Refer to the wiring diagram typically provided with the product packaging for specific connections. General connections include:

• Power Supply: Connect to a 12V or 24V DC power source. Ensure correct polarity.
• Ground: Connect to a reliable ground point.
• Tacho Signal Input: Connect to the engine's tachometer signal output. This is typically from the alternator 'W' terminal, ignition coil, or a dedicated RPM sensor.
• Backlight: Connect to a switched 12V/24V source for illumination. The tachometer supports red and yellow dual-color background light, which can be selected during wiring.
• Resistors: For moving magnet gauges operating within an 8V-16V range, extra resistors may be required. Consult the specific wiring diagram for your application.

Ensure all connections are secure and insulated to prevent short circuits and corrosion, especially in marine or harsh environments.

4. Operation

Once properly installed and powered, the KUS Tachometer will display the engine's RPM. The needle indicates the current RPM, scaled by x100 (e.g., '20' on the dial means 2000 RPM). The integrated digital display at the bottom shows the accumulated engine hours.

4.1 Speed Ratio Adjustment

The tachometer has an adjustable speed ratio (0.5-250) to match various engine types and signal sources. This adjustment is typically made via a button or switch on the back of the gauge during initial setup. Refer to the detailed wiring and setup instructions provided with the product for specific steps on how to set the correct speed ratio for your engine.

5. Maintenance

The KUS Tachometer is designed for durability and requires minimal maintenance. Follow these guidelines to ensure its longevity:

• Cleaning: Clean the gauge face with a soft, damp cloth. Avoid abrasive cleaners or solvents that could damage the glass or bezel.
• Inspection: Periodically inspect wiring connections for corrosion or looseness. Ensure the mounting remains secure.
• Waterproofing: The IP67 rating ensures complete waterproofing. However, avoid directing high-pressure water jets directly at the gauge, especially around the rear connections.

6. Troubleshooting

If the tachometer is not functioning correctly, consider the following common issues:

• No Display/No Power: Check the power supply and ground connections. Ensure the fuse in the power line is intact.
• Incorrect RPM Reading: Verify the speed ratio setting is correct for your engine. Check the signal wire connection from the engine. Ensure the signal source is functioning properly.
• Intermittent Readings: Inspect all wiring for loose connections, corrosion, or damage. Ensure the signal source is stable.
• Fogging: While the gauge has an anti-fogging function, extreme temperature changes can sometimes cause temporary condensation. This should dissipate quickly. If persistent, check for seal integrity.

If problems persist after checking these points, consult a qualified technician.

7. Specifications

8. Warranty Information

This KUS Tachometer is covered by a warranty for one year after shipment. This warranty covers manufacturing defects and material faults under normal use. The warranty does not cover damage resulting from improper installation, incorrect operation, accidents, abuse, modification, or unauthorized repair.

9. Support

For technical assistance, troubleshooting beyond the scope of this manual, or warranty claims, please contact your authorized KUS dealer or the point of purchase. Ensure you have your product model number (CMHB-WS-4KL) and part number (KY07102) available when seeking support.