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

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.