KONGSBERG RPM420S – Dual Signal Output Speed Sensor | Maritime & Industrial RPM Transmitter Platform
Engineering Background
The RPM420S is engineered by Kongsberg Maritime, a global leader in advanced maritime technology and automation systems headquartered in Norway. Kongsberg’s sensor division has decades of field-proven experience supplying critical instrumentation to commercial shipping, offshore platforms, naval vessels, and heavy industrial facilities worldwide. The RPM420S represents the company’s commitment to precision, reliability, and signal integrity in demanding environments where measurement accuracy directly impacts operational safety and efficiency.
Product Positioning
The RPM420S is a high-accuracy shaft speed (RPM) transmitter designed for continuous monitoring of rotating machinery — including main propulsion engines, auxiliary generators, pumps, and compressors. It delivers dual configurable signal outputs, enabling simultaneous integration with bridge control systems, alarm management units, and data acquisition platforms without additional signal splitters or converters. This makes it the preferred choice for system integrators and automation engineers specifying sensors for IAS (Integrated Automation Systems) and PMS (Power Management Systems) on modern vessels and industrial plants.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model | RPM420S |
| Manufacturer | KONGSBERG Maritime AS |
| Function | Shaft Speed / RPM Measurement & Transmission |
| Signal Output Mode | Dual configurable outputs (frequency / analog / digital) |
| Output Signal Type | 4–20 mA analog / pulse frequency / RS-422 (model-dependent) |
| Measurement Range | 0–3600 RPM (configurable) |
| Accuracy | ±0.1% of full scale |
| Supply Voltage | 18–36 VDC |
| Power Consumption | <5 W |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -40°C to +85°C |
| Enclosure Rating | IP66 / IP67 |
| Housing Material | Marine-grade stainless steel / aluminium alloy |
| Mounting | Flange or bracket mount (M12 connector) |
| Connector | M12 circular, 4-pin or 8-pin |
| Weight | Approx. 1.5 kg |
| Approvals / Certifications | DNV GL, IEC 60945, CE |
| Country of Origin | Norway |
| Part Number / SKU | RPM420S |
Proven Application Environments
- Marine Main Propulsion: Continuous shaft RPM monitoring on diesel, dual-fuel, and LNG propulsion systems integrated with bridge IAS/AMS.
- Auxiliary Machinery: Generator sets, bow thrusters, and steering gear — where precise speed feedback is critical for load sharing and PMS control.
- Offshore Platforms: Pump and compressor speed monitoring in hazardous and corrosive environments requiring IP66+ protection.
- Industrial Automation: Heavy rotating equipment in steel mills, power plants, and process industries requiring dual-channel output for redundant SCADA integration.
- Naval & Coast Guard Vessels: Mission-critical speed sensing with DNV GL-certified reliability.
Engineering Advantages
- Dual Independent Signal Outputs: Simultaneously drive two separate control or monitoring systems — eliminating signal splitters and reducing wiring complexity.
- Wide Supply Voltage Range (18–36 VDC): Compatible with both 24 VDC industrial panels and 32 VDC marine distribution boards without additional regulators.
- IP66/IP67 Sealed Enclosure: Withstands wash-down, salt spray, and condensation — fully compliant with IEC 60945 maritime environmental standards.
- High Linearity ±0.1%: Meets the accuracy demands of closed-loop speed control and precision alarm setpoint management.
- DNV GL Type Approval: Accepted by all major classification societies for newbuild and retrofit projects without additional survey requirements.
- Compact & Robust Construction: Stainless steel housing resists vibration, shock, and mechanical stress in engine room installations.
System Architecture & Signal Flow
The RPM420S mounts directly to the shaft housing or gear tooth wheel via a standard flange bracket. The internal inductive or Hall-effect sensing element detects tooth-pass events and converts them to a calibrated output signal. The dual-output circuit board independently conditions two signal channels — allowing one channel to feed the vessel’s IAS/AMS and the second to connect to a remote display, data logger, or redundant control system. Signal isolation between channels prevents ground loops and ensures measurement integrity across long cable runs in electrically noisy engine rooms.
Typical Signal Flow: Rotating shaft → Tooth wheel → RPM420S sensor head → Dual conditioned outputs → IAS Channel A + AMS/SCADA Channel B
Sourcing & Quality Verification
- All KONGSBERG RPM420S units supplied by Konmask.com are sourced through verified industrial distribution channels with full traceability to original manufacturer documentation.
- Each unit ships with original KONGSBERG labeling, serial number, and factory test certificate where available.
- We perform incoming inspection including visual verification, label authentication, and connector integrity checks prior to dispatch.
- Counterfeit risk mitigation: Konmask.com does not source from grey-market or unverified secondary suppliers.
Procurement Process
- Confirm Part Number: Verify RPM420S matches your system’s signal output requirement (analog 4–20 mA, frequency pulse, or RS-422).
- Request Quote: Contact support@konmask.com for volume pricing, lead time, and datasheet confirmation.
- Place Order: Orders processed within 1 business day. Express shipping available for urgent vessel requirements.
- Documentation: Commercial invoice, packing list, and certificate of conformance provided with every shipment.
- After-Sales Support: Technical integration support available via email or phone for installation and commissioning queries.
Technical FAQ
Q: Can the RPM420S output both 4–20 mA and frequency pulse simultaneously?
A: Yes. The dual-output design allows independent configuration of each channel. Consult the datasheet for specific output combination options per firmware version.
Q: Is the RPM420S compatible with Kongsberg K-Chief and K-Pos systems?
A: Yes. The RPM420S is designed as a native sensor for Kongsberg’s K-Chief 600/700 IAS and integrates directly without additional signal conditioning modules.
Q: What is the maximum cable run length?
A: For 4–20 mA output, cable runs up to 500 m are supported with standard shielded twisted-pair cable. For frequency/pulse output, maximum recommended run is 200 m.
Q: Does the unit require calibration on installation?
A: The RPM420S is factory-calibrated. Field configuration of the RPM range and output scaling is performed via the front-panel DIP switches or optional configuration software.
Q: What tooth wheel specifications are compatible?
A: Standard 60-tooth (60-2) and custom tooth counts are supported. Minimum tooth height and gap dimensions are specified in the installation manual (available on request).
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