B&G Ultrasonic Speed Sensor Installation and User Manual BGH074004-02
ULTRASONIC SPEED SENSOR 1
ULTRASONIC SPEED SENSOR Certification Warnings and Precautions Warning: This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.
ULTRASONIC SPEED SENSOR Contents Para Page 1.1 INTRODUCTION.................................................................................... 4 1.2 FEATURES............................................................................................ 4 1.3 COMPATIBILITY ................................................................................... 4 1.4 OPERATION.......................................................................................... 5 1.5 SETUP ...........................
ULTRASONIC SPEED SENSOR 1.1 Introduction The Ultrasonic Speed Sensor offers highly accurate boat speed measurement with a minimum of maintenance due to not having any moving parts. The Ultrasonic Speed Sensor uses ultrasonic pulses to obtain echoes from particles in the water. If the sensor loses contact with the water, or is positioned in a flow of highly aerated water, it will lose its signal and register an incorrect speed measurement.
ULTRASONIC SPEED SENSOR 1.4 Operation The Ultrasonic Speed Sensor uses ultrasonic pulses to collect echoes from small particles in the water as they pass under the two transducers embedded in the unit (refer to figure 1.1). These transducers monitor the particles in their respective beams. As the boat travels through the water, both transducers ‘view’ the same stream of particles.
ULTRASONIC SPEED SENSOR 1.5 Setup The setup and calibration procedure for the Ultrasonic Speed Sensor is identical to the procedure for calibrating a paddlewheel speed sensor as explained in the relevant section of your system User Manual. 1.6 Specifications Ultrasonic frequency: Pulse repetition frequency: Distance to particles: Thru-hull diameter: DC voltage supply: Current: Operating temperature range: Data update rate: Accuracy: Minimum speed: Maximum speed: Outputs: 4.5MHz 5.
ULTRASONIC SPEED SENSOR 1.7 Installing the Ultrasonic Speed Sensor Junction Box 1. Select a suitable dry location ensuring adequate clearance from other equipment or structures. 2. Use a pencil or other marking device to locate the mounting holes. 3. Drill the mounting holes for the unit. 4. Using the self-tapping screws supplied, secure the junction box. Note: The junction box must not be submerged. Install the unit with the cable entries facing downward to prevent water ingress.
ULTRASONIC SPEED SENSOR 1.8 Junction Box Electrical Connections BRN W HT GRN BLK RED RED GRN BLK W HT YEL RED BLK BATTERY SENSOR INSTRUMENT 12 Volt DC Power Supply Ultrasonic Speed Sensor Transducer Cable Hydra, Hercules or HS System supply cable Figure 1.2 – Junction box electrical connections NOTE: Trim all screens from the cables in the junction box to ensure that they do not make contact with each other or any other wire or component in the junction box.
ULTRASONIC SPEED SENSOR 1.8.1 Ultrasonic Connections to Hydra/Hercules Processor 28 Hydra/Hercules 29 30 31 32 33 34 35 36 Main Cable from Ultrasonic Speed Sensor Junction Box Note: All screened wires must have their screen attached to the clamp bar across the front case. Figure 1.3 - Connections to Hydra/Hercules Processor Terminal 31 32 33 34 35 Function BOATSPEED INPUT NO CONNECTION GROUND SEA TEMP./PADDLE SUPPLY SEA TEMP. INPUT Wire Colour Green Black Red/White Yellow Table 1.
ULTRASONIC SPEED SENSOR 1.9 Installation Select a suitable location on the boat’s hull (refer to Figure 1). Clean the chosen area inside the hull using a mild household detergent or a weak solvent such as alcohol to remove traces of fuel, grease etc. Figure 1.
ULTRASONIC SPEED SENSOR 1.9.1 Single Skin Hull Drill a 3mm (1/8 inch) pilot hole from inside the hull. Using a 51mm (2 inch) hole saw cut a hole from the outside of the hull. Clean and sand the area around the hole to ensure that the sealant will adhere properly to the hull. Figure 1.6 - Ultrasonic Speed Sensor Assembly 1.9.
ULTRASONIC SPEED SENSOR There are two methods for preparing the hull to receive the housing: 1. Saturate layers of fibreglass cloth with a suitable resin and lay the cloth inside the hole to seal and strengthen the core, adding layers until the correct diameter is achieved. 2. Coat a cylinder of the correct diameter with wax and gently tap it into the hole in the outer skin. Fill the gap between the cylinder and the inner skin with casting epoxy.
ULTRASONIC SPEED SENSOR Figure 1.7 - Preparation of a Cored Fibreglass Hull 1.9.3 Attaching the safety wire Plastic housing – Attach the wire to one eye of the hull nut. Twist the wire in a anti-clockwise direction and thread it through one of the eyes in the cap nut, then through the pull ring and the other eye of the cap nut, and finally through the opposite eye of the hull nut. Twist the wire onto itself to lock the assembly.
ULTRASONIC SPEED SENSOR 1.10 Maintenance The retractable sensor units are supplied with a blanking plug, which must be used when the Ultrasonic Speed transducer is removed for inspection, maintenance, replacement or storage. Removing the Ultrasonic Speed transducer from the ‘Flapper-Valve’ housing: Inspect and lubricate the O-ring seals on the blanking plug using silicone grease or petroleum jelly. Remove and discard the safety wire (Refer to Figure 1.6 on Page 1-9 of this manual).
ULTRASONIC SPEED SENSOR Figure 1.
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