DEIF BRW-1 Marine Instruments: Installation and Calibration Guide for Offshore Bridge Indicators

DEIF BRW-1 Marine Instruments: Installation and Calibration Guide for Offshore Bridge Indicators

Introduction: Bridge instruments - the "eyes" of ship maneuvering

In ship navigation and control systems, Bridge Wing instruments are a crucial component for captains and helmsmen to perceive the operational status of the propulsion system. Especially during critical moments that require precise control such as berthing and disembarking, the instruments located on both sides of the bridge - especially the propeller speed indicator - must provide clear, reliable, and real-time data feedback. The harshness of the marine environment - salt spray corrosion, severe vibrations, extreme temperatures, and continuous humidity invasion - places far higher durability and protection requirements on such instruments than on land industrial equipment.

The DEIF BRW-1 bridge instrument is a professional level solution designed to meet this challenge. It is a pointer type indicator instrument designed for outdoor and harsh environmental applications, integrating high protection level, long-lasting lighting, and flexible installation methods. For shipyard electrical engineers, ship equipment maintenance personnel, and modification project technicians, a deep understanding of the installation specifications, wiring points, and on-site calibration methods of BRW-1 is the foundation for ensuring its long-term stable operation and proper functionality. This article will systematically disassemble the key technical points of the entire process from unboxing to commissioning of BRW-1 based on the official installation manual.

Product Overview and Application Scenarios: Designed for harsh marine environments

The design philosophy of BRW-1 began with a profound understanding of the special characteristics of ship applications. It is not only a measuring instrument, but also an important component of the ship bridge human-machine interaction interface.

1. Core features and advantages

From the perspective of product specifications and technical parameters, BRW-1 has been comprehensively optimized for marine application environments:

IP66 high waterproof and dustproof rating: This is one of the most prominent features of BRW-1. According to IEC 529 and EN 60529 standards, IP66 rating means that the instrument can completely prevent dust from entering and withstand strong water spray from any direction. This is crucial in scenarios such as deck cleaning and wave crashing, ensuring the safety of the internal precision measurement circuit.

Durable structure and material: The shell is made of ABS/PC hybrid material, which has excellent mechanical strength and impact resistance. At the same time, the material has flame retardant and self extinguishing properties (UL94 V0 grade), which enhances the fire safety level of ships.

Long term LED lighting: Traditional instruments often use incandescent bulbs for lighting, which have a short lifespan and are prone to being unusable at night due to filament burnout. BRW-1 adopts LED lighting, which has extremely long service life and low power consumption characteristics, significantly reducing maintenance frequency. The instrument provides black background white or white background black scale versions, and supports independent pointer illumination to ensure excellent reading clarity at night or in low visibility conditions.

Built in dimming potentiometer: The bridge building needs to maintain a low light environment to protect night vision capability during nighttime navigation. The BRW-1 has a built-in dimming potentiometer on the front panel, allowing crew members to easily adjust the brightness of the scale lighting. In addition, remote dimming can be achieved through external potentiometers according to needs, further improving operational convenience.

2. Typical applications

The most common application scenario of BRW-1 is to install it as a propeller RPM indicator on the control consoles on both wings of the bridge. The dial can be customized according to the actual propeller speed range and the reduction ratio of the ship's propulsion system (specified at the time of ordering), providing accurate thrust feedback for berthing and berthing operations. In addition, it can also be used to display other key parameters for ships, such as bow thruster speed, rudder angle indication, or hydraulic system pressure.

Mechanical installation: firmness and sealing are key prerequisites

The correct installation of BRW-1 begins with sufficient attention to mechanical fixation and protective sealing. Improper installation can directly lead to the failure of protection level, which in turn can cause internal condensation, corrosion, and even circuit short circuits.

1. Installation method and size

Base Mounted: The BRW-1 adopts a bottom mounted method, fixing the instrument housing to the console panel with four M6 screws.

Equipment weight: The weight of the instrument body is approximately 2.8 kilograms. During installation, it should be ensured that the supporting structure can withstand the weight and vibration load during ship operation. It is recommended to use spring washers or anti loosening nuts to prevent loosening.

2. Precautions for sealing protection and anti-static measures

Silicone seal protection: Special silicone sealing materials are used between the shell and panel, as well as between the glass and the frame of BRW-1, to achieve IP66 protection. During installation, disassembly, or subsequent maintenance, extra care must be taken to avoid damaging these seals. Any scratches or deformations may cause water tightness failure.

Electrostatic discharge protection: Unlike other precision electronic devices, BRW-1 is designed with electrostatic protection in mind, and its instructions clearly state that "no special ESD protection measures are required during installation". This simplifies the on-site installation process, but despite this, following basic electrostatic discharge prevention measures (such as avoiding direct contact with circuit boards in dry environments) is still a good engineering practice.

Electrical connection: precise wiring ensures reliable operation

The electrical connection of BRW-1 involves power supply, signal input, and additional functions. Correct wiring is the guarantee for accurate instrument indication and long-term stability.

1. Wiring terminals and operating space

The wiring terminals of the instrument are hidden behind the dial and need to be disassembled before they can be accessed:

Disassembly steps: Use a standard 4mm hex wrench to disassemble the potentiometer panel located in front of the dial. After disassembly, the internal wiring terminal block can be seen. During this process, it is also important to be careful not to damage the silicone sealing ring between the panel and the shell.

Applicable wire diameter: Screw terminals are suitable for multi strand flexible wires ranging from 0.2 to 2.5 mm ², or single strand hard wires up to 4 mm ². It is recommended to use multiple strands of soft wire and match it with a suitable wire nose to obtain more reliable electrical connections and better anti vibration performance.

2. Definition of power and signal terminals

Lighting power supply (terminals 5 and 6):

Under standard configuration, the lighting power supply is 24V AC/DC, connected to terminals 5 (positive/phase) and 6 (negative/medium) labeled "SUPERLY ILLUM.

High voltage configuration: For BRW-1 with an ordered 110/220V AC built-in transformer version, the lighting power supply cannot be connected to terminals 5 and 6, but should be directly connected to the dedicated terminals on the transformer (marked as 0V, 110V, 220V). This configuration also allows for the simultaneous connection of 24V DC as a backup power source, which automatically switches when the main power supply loses power, ensuring that critical indicators are never interrupted. This is a highly valuable feature.

Measurement signal input (terminals 1 and 2):

The measurement signal of the instrument (such as 4-20mA current signal from the speed transmitter or 0-1mA DC signal) should be connected to terminal 1 (positive pole) and terminal 2 (negative pole).

Grounding protection (EARTH terminal):

The terminal marked with "EARTH" must be reliably connected to the ship's grounding. This is not only a requirement of safety regulations (to prevent electric shock), but also an important measure to ensure measurement accuracy. Good grounding can shield external electromagnetic interference (EMI) and prevent stray currents from the ship from affecting instrument readings.

3. Engineering application of "through terminal"

BRW-1 is equipped with a set of auxiliary wiring points called "FEED-THROUGH TERMINALS" (through terminals). These terminals are connected in parallel with the main circuit and can be easily used in series to provide power to other adjacent instruments without the need for additional junction boxes or branch cables. This design reduces the number of cables and simplifies the wiring inside the bridge control console, reflecting DEIF's engineering wisdom in details.

4. Cable entrance

Two PG 13.5 cable sealing connectors are provided at the bottom of the instrument housing (optional with one PG 21 connector). PG 13.5 is suitable for cables with an outer diameter of 7.5/10/12.5mm, while PG 21 is suitable for cables with an outer diameter of 10/13/16/19mm. Choosing the correct sealing joint and adapting the outer diameter of the cable is crucial for maintaining the IP66 protection level.

On site calibration and scale replacement: customization and maintenance

The flexibility of BRW-1 is not only reflected in the ordering options, but also in the on-site adjustment and maintenance capabilities. Among them, the replacement of the dial is a typical task that engineers may encounter in project changes or instrument spare parts management.

1. Range calibration (maximum adjustment)

There is a potentiometer labeled "MAX. ADJ" between the two connectors on the front of the instrument panel.

Function: This potentiometer allows for adjusting the deflection angle of the instrument within a range of ± 10% of full scale. This function is mainly used to fine tune and match the scale of the indicator with the output of the actual sensor or transmitter on site, such as compensating for small losses in the signal transmission line.

Limitations: Instruments with measurement ranges of 0... 1mA and -0.5... 0... 0.5mA are not equipped with this adjustment function (potentiometers will be labeled and sealed). In addition, the measurement range with zero suppression (such as 4-20mA) does not have mechanical zero adjustment function, and its zero point is defined by electrical signals.

2. Mechanical zero point adjustment

The mechanical zero point of the pointer may experience slight deviations due to transportation vibrations or long-term use.

Adjustment method: This adjustment is achieved by moving the fork located at the front of the moving coil system. Slightly move the fork to one side or the other to accurately zero the pointer. This is a purely mechanical operation that does not require electricity.

Attention: For input signals such as 4-20mA, the zero point is determined by the input current and does not require this mechanical adjustment.

3. Change of scale - step-by-step operation

BRW-1 has been installed with the corresponding dial according to the order requirements when it leaves the factory. However, when modifying equipment, changing usage, or replacing spare parts, it may be necessary to replace the scale. Although the operation is not complicated, it requires extreme precision. The official manual provides a rigorous 12 step process:

Disassemble the frame and glass: Remove the 4 screws on the bezel and remove the panel glass. Pay attention to protecting the silicone sealing ring.

Remove the four corner screws that secure the dial:.

Dismantling PCB fixing screws: Remove the 4 corner screws that fix the PCB at the bottom (using standard magnetic screwdriver heads and Phillips screwdriver heads).

Separate PCB and connector: Carefully lift the PCB and dial assembly while disconnecting the electrical connections on the PCB. This step needs to be extremely gentle to avoid damaging the wiring or connectors.

Disassemble the center screw of the dial: Remove the 2 screws at the center of the dial.

Remove old dial: Carefully slide the old dial out from above the pointer. This operation carries the highest risk and should be avoided from touching, bending, or damaging the pointer.

Install new dial: Carefully insert the new dial through the pointer into place.

Install PCB and restore connections: Insert the PCB and restore the electrical connections on the PCB.

Fixed PCB: Reinstall the 4 corner screws that fix the PCB.

Fixed dial: Reinstall the 4 corner screws that fix the dial.

Zero point inspection and adjustment: Check the zero position of the pointer, and if necessary, perform mechanical zero adjustment through the fork at the front of the moving coil.

Install frame: Reinstall the frame with glass.

Quick overview of technical specifications and maintenance suggestions

In order to facilitate engineers to quickly access key parameters on site, the following is a summary of the core technical specifications of BRW-1:

Parameter specifications

Accuracy level 1.5 (-10 to 55 ° C range) according to EN 60051/IEC 51

Protection level IP66 (according to IEC 529/EN 60529)

Lighting voltage 24V AC/DC (standard) or 110/220V AC (with built-in transformer)

Power consumption white background scale: 150mA@24V Black background scale: 300mA@24V

Electrical isolation 2kV -50Hz -1 minute

Compass safety distance of 1 meter

EMC standards EN 50081-1/2, EN 50082-1/2, SS4361503 (PL4), IEC 255-22-1

Applicable wire diameter 0.2... 2.5 mm ² (multi strand), 4 mm ² (single strand)

Cable entry 2 PG 13.5 or 1 PG 21 sealed joint

Shell material ABS/PC hybrid, flame retardant and self extinguishing (UL94 V0)

Weight approximately 2.8 kg

Maintenance Recommendations

Regular inspection: Check the sealing of the glass panel once a quarter and observe whether there are signs of condensation or salt spray deposition inside.

Lighting inspection: Regularly verify the LED lighting function and smooth operation of the dimming potentiometer in low light environments.

Calibration cycle: It is recommended to perform precision calibration on instruments every 2-3 years or during major ship maintenance periods, and use MAX. ADJ potentiometers for fine adjustment.

Seal replacement: If the panel or frame has been disassembled during maintenance, it is recommended to replace the silicone seal simultaneously to ensure the continued effectiveness of the IP66 protection level.