Product overview
The Kobelt 7175‑MZ is a waterproof, illuminated marine indicator that continuously displays the vessel’s actual rudder position at the bridge or another steering-control station.
It receives its signal from a 1 kΩ rudder feedback potentiometer, such as the Kobelt 7163, 7168 or 7174. One 7175‑MZ master can operate with as many as five compatible slave indicators.
Technical specifications
| Specification | Details |
|---|---|
| Manufacturer | Kobelt Manufacturing Co. Ltd. |
| Country of origin | Canada |
| Active part number | 7175‑MZ |
| Product type | Master analog rudder-angle indicator |
| Display diameter | Approximately 3 inches |
| Indication | Port–zero–starboard rudder position |
| Movement range | ±45° from centre |
| Movement accuracy | ±1.5° |
| Input signal | 1 kΩ potentiometer |
| Nominal supply | 12 or 24 VDC |
| Operating-voltage range | 10.8–31.2 VDC |
| Maximum meter current | 20 mA |
| Illumination current | 60 mA at 24 V / 190 mA at 12 V |
| Operating temperature | −20°C to +55°C |
| Storage temperature | −30°C to +70°C |
| Front protection | IP56 above the console |
| Rear protection | IP20 below the console |
| Dimensions | 96 × 78 × 96 mm |
| Weight | Approximately 0.4 kg |
| EMC/EMI standard | IEC 60945 |
| Compass-safe distance | 2 cm |
| Approval listed by maker | Lloyd’s Register LR2481998TA |
Specifications are taken from the current Kobelt 7175 official datasheet.
Main features
- Three-colour port and starboard scale
- Backlit display for day and night operation
- Waterproof front face
- Compact bridge-console installation
- Adjustable zero and span
- Master and slave configurations available
- Up to six indicators in one operational loop
- Reversed indicator available for aft-facing stations
- Compatible with established Kobelt rudder-feedback units
- Current Z-series replaces several discontinued 7175 versions
Operating principle
A rudder feedback unit mechanically follows the steering gear or rudder stock. Its potentiometer produces an electrical signal proportional to the rudder angle.
The 7175‑MZ receives this signal and moves its pointer to show the rudder’s actual port or starboard position. Slave indicators can repeat the master indication at additional control stations.
Applications
- Ship wheelhouses
- Bridge wings
- Aft steering stations
- Emergency steering rooms
- Tugboats and workboats
- Ferries and passenger vessels
- Offshore-support vessels
- Commercial and naval vessels
- Rudder-order and steering-control systems
Current 7175-series part numbers
| Part number | Configuration |
|---|---|
| 7175‑MZ | Master rudder-angle indicator |
| 7175‑SZ | Slave rudder-angle indicator |
| 7175‑SRZ | Reversed slave rudder-angle indicator |
| 7175‑HMZ | Master rudder-order indicator |
| 7175‑HSZ | Slave rudder-order indicator |
| 7175‑PMZ | Master propeller-pitch indicator |
| 7175‑PSZ | Slave propeller-pitch indicator |
The manufacturer confirms that the current Z-series replaces several retired 7175 variants while remaining generally backward compatible. Installation differences must still be checked. Kobelt official product page
Superseded master models
The 7175‑MZ replaces older master rudder-angle indicators including:
- 7175‑M
- 7175‑MA
- 7175‑MY
- 7175‑MY‑24
- 7175‑BMX
- 7175‑BMA
Information required for quotation
- Complete existing part number
- Master or slave configuration
- Standard or reversed display
- Supply and illumination voltage
- Rudder feedback-unit model
- Potentiometer resistance and wiring
- Required indication range
- Number of indicators in the loop
- Console cut-out dimensions
- Photographs of the existing indicator, rear terminals and nameplate
