Advanced Measurement Capabilities
This instrument is designed to measure a wide array of parameters with high precision:

• Frequency and Rotational Speed (RPM): Ideal for monitoring pumps, generators, and shaft speeds.

• Pulse Counting & Encoder Positioning: Features two counter inputs to co-operate with incremental encoders, counting both actual and total values .

• Period and Work Time Counter: Perfect for cycle timing and equipment run-time logging.

• Real-Time Clock: An integrated clock with supply backup in case of power failure .

Innovative Tri-Color Display for At-a-Glance Status
The N30O stands out with its 3-color LED display (red, green, orange), which is fully programmable. You can configure the display to change color based on the measured value (e.g., green for normal operation, orange for warning, red for critical alarm). This feature, combined with a highlighted measuring unit, allows operators to instantly assess system status from a distance, enhancing situational awareness in engine rooms.

Comprehensive Output and Communication Options
This model is highly adaptable, offering a full suite of I/O options:

• Four Alarm Outputs: Equipped with 2 NOC relay alarms and 2 switched relay alarms (changeover contact), all operating in 6 different modes (e.g., on, off, hysteresis) with front-panel LED signaling .

• Programmable Analog Output: The measured value can be converted into a standard industrial signal, selectable as 0/4…20 mA or 0…10 V, for transmission to PLCs or remote displays .

• Digital Communication: Features a galvanically isolated RS-485 interface with MODBUS RTU protocol, allowing for seamless integration into ship automation systems, SCADA, or building management systems for remote monitoring and control.

• 24V DC Transducer Supply: An integrated output provides power to external sensors (encoders, proximity switches), simplifying installation .

Flexible Programming and Signal Conditioning
The N30O offers powerful signal processing capabilities. It includes mathematical functions (square root, inversion) and a 21-point individual characteristic for linearizing non-linear sensor signals . Programming is simple via the front-panel keyboard or remotely via the RS-485 interface using LUMEL’s free eCon software . Additional features include min/max value memory, programmable averaging time (up to 1 hour), and password protection for configuration lock.

Rugged Construction for Harsh Environments
Built to withstand the rigors of marine and industrial environments, the N30O features a robust plastic casing with an IP65 protection rating from the front, making it dust-tight and protected against water jets . It fits a standard 96×48 mm DIN cut-out and offers flexible mounting options for panels or DIN rails (with optional adapter).

Flexible Input Configuration
This model is designed to work with a wide variety of sensors, offering great flexibility in retrofitting or new installations. It accepts:

• Resistive Sensors: Potentiometric sensors (e.g., 0…100 Ω up to 0…10 kΩ) commonly used in float-type level transmitters.

• Current Loop: 0(4)…20 mA signals from standard 2-wire or 3-wire transmitters.

• Voltage Signals: 0…5 V, 1…5 V, 0…10 V, etc.

• Potentiometer Mode: Direct connection to 3-wire potentiometers without the need for a transmitter.

Integrated Control and Alarms
The N21-00E0 configuration includes two relay outputs. These outputs are fully programmable and can be used for:

• High-level and low-level alarms (e.g., “Tank Full” and “Tank Empty”).

• Automatic pump control (filling or emptying).

• Triggering external annunciators or PLC inputs.

• Adjustable hysteresis prevents relay chattering near setpoints.

User-Friendly Operation
The device features a clear LED display that shows the current level in engineering units (e.g., Liters, Meters, %, or custom units). The front panel includes intuitive buttons for easy programming of setpoints, input scaling, and display characteristics. A programmable tare function allows for net value measurement, and the peak/valley detection helps monitor extremes .

Robust Construction for Harsh Environments
Consistent with LUMEL’s quality standards, the N21 series is built for reliability in demanding conditions. It features a compact 96×48 mm (DIN 43700) housing for flush panel mounting, with an IP 54 protection rating from the front, making it resistant to dust and water splashes in engine rooms or on outdoor panels. The standard power supply version (85…253 V AC/DC) ensures easy integration into existing control cabinets.

Comprehensive Power Monitoring
This unit is capable of accurately measuring the key parameters of an electrical installation, including:

• Phase and Line Voltages (V)

• Phase Currents (A)

• Frequency (Hz)

• Active, Reactive, and Apparent Power (kW/kvar/kVA)

• Active and Reactive Energy (kWh/kvarh)

• Power Factor (cosφ)

Flexible Integration and Outputs
The NA5-TRU00410008 stands out due to its multi-function outputs. It features:

• 1 Configurable Analog Output: The analog output (e.g., 4-20mA or 0-10V) can be programmed to retransmit any of the measured values (like power or current) to external PLCs, recorders, or remote displays .

• RS-485 Communication Port: Equipped with a galvanically isolated RS-485 interface running the MODBUS RTU protocol, this device can be easily integrated into larger SCADA, BMS, or ship automation systems. This allows for centralized monitoring of energy consumption and power quality from a control room .

• Pulse Output (Energy): The unit can also function as an energy meter, providing a pulse output proportional to the consumed energy (kWh) for feeding into totalizers or for billing purposes .

Rugged Design for Industrial Use
Housed in a durable 96x48mm (DIN 43700) case, it is designed for flush mounting on switchboard panels. It operates reliably in a wide temperature range and features a high ingress protection (IP 54 from the front), making it suitable for the harsh conditions found in industrial plants and marine engine rooms. The supply voltage for this specific model is 85-253V AC/DC, making it universally adaptable to various control panels without needing an external power supply module.