GILL OMC-139 MARINE WIND DISPLAY INDICATOR

he GILL/Observator OMC-139 Marine Wind Display Indicator is a robust, shipborne digital instrument designed for clear and reliable indication of relative wind speed and direction on marine vessels. It is part of the “Obsermet” line of meteorological instruments and is particularly noted for its use in professional and commercial marine applications.

Key Product Features

Combined Display: The unit is a single, integrated display for both wind speed and wind direction.
Direction Indication: Uses a distinctive double ring of 36 LEDs to show direction. The outer ring typically indicates the actual/current wind direction (often in Red LEDs), while the inner ring shows the average wind direction or wind variation (often in Amber LEDs).
Marine Scale: The front panel’s circular scale is specifically designed for shipborne use, displaying $0^{\circ}$ to $18 0^{\circ}$ on both sides of the scale.
Speed Display: Features a digital LED indicator (usually 3-digit, 7-segment) for clear, real-time wind speed.
Gust Data: Includes a separate digital display for showing gust speed and tracking both minimum and maximum gusts.
Averaging Functions: Built-in calculation for showing 2-minute and 10-minute average wind speed and direction (or a user-defined average).
Units: Supports display in multiple wind speed units, including m/s, knots, mph, km/h, and Beaufort scale.
Connectivity (Standard): Standard equipped with a NMEA 0183 output for seamless integration and transfer of data to other bridge systems.
Sensor Compatibility: Designed to read information directly from various compatible wind speed and direction sensors (e.g., Gill/Observator OMC-series sensors) via standard interfaces like T.T.Y. or RS422, often providing the power supply to the sensor.
Installation: Suitable for flush mounting in a panel, housed in a standard $144 \times 144$ mm DIN-size casing. A “Black Line” OEM front option is also typically available.
Daisy-Chaining: Equipped with outputs (e.g., 20mA current loop/RS422) to easily transfer sensor information to a second (or more) wind display unit.

Technical Specification

Display & Readout

Feature	Specification
Speed Display	3-digit, 7-segment LED display ( $14.3 mm$ height)
Gust Display	3-digit, 7-segment LED display ( $10.1 mm$ height)
Direction Display	Double ring of 36 circular LEDs:
	– Current Direction: Red LEDs
	– Average/Variation: Amber LEDs
Wind Speed Units	$m/s$ , $knots$ , $mph$ , $km/h$ , and Beaufort scale
Averaging Periods	2 minutes, 10 minutes, or user-selectable
Direction Scale	$0^{\circ} to 18 0^{\circ}$ on both sides (Marine standard)

Power & Electrical

Feature	Specification
Power Supply	Multiple options, typically selectable (e.g., $230 VAC$ , $115 VAC$ , $24 VDC$ , $12 VDC$ )
Power Consumption	Typically $20VA max$ (varies by power supply option)
Sensor Supply Output	$+ 15 VDC$ to power the connected wind sensor
Direction Reference	$2.5 VDC$ (Direction Sensor Reference Supply)

Input/Output (I/O)

Feature	Specification
Standard Digital Output	NMEA-0183 (RS422 or RS232 optional)
Daisy-Chain Output	$20 mA$ Current Loop ( $300 Baud, ASCII-code$ ), or $RS 422$
Analog Outputs (Optional)	OMC-127 option: $4 to 20 mA$ or $0 to 1 Volt$ for both speed and direction
Input Signal	$T.T.Y.$ or $RS 422$ (NMEA-0183) directly from the wind sensor, $20 mA$ Current Loop
Optional Inputs	Wind speed pulse, Direction potentiometer