In modern technical and industrial applications, precise monitoring of mains voltage is of critical importance. The HW-group Sensor 230V AC 1W-UNI has been specifically developed to accurately measure alternating voltages in the range of 100 to 250 volts AC and provide the readings via the galvanically isolated 1-Wire UNI bus. This reliable solution plays a key role in detecting voltage fluctuations or outages early and protecting critical systems from damage. Thanks to its robust design, easy integration, and high measurement accuracy, it is ideal for use in data centers, server rooms, industrial plants, and UPS monitoring.

Measuring and monitoring mains voltage is especially important in sensitive IT infrastructures. A sudden voltage drop or unexpected surge can not only cause system failures but also damage expensive hardware. With the HW-group Sensor 230V AC 1W-UNI, such issues can be prevented through continuous real-time monitoring. The voltage sensor can be directly connected via RJ11 to devices such as Poseidon2, Ares, or STE2. The measurement data is then available via LAN or GSM and can be evaluated by central monitoring systems.

Unlike simple measuring modules, this sensor offers full galvanic isolation between input and data line. This ensures that the measurement system is protected from voltage spikes and potentially dangerous backfeed. It enhances both personnel safety in the vicinity and the operational security of connected devices. Bus power via the 1-Wire UNI bus makes the sensor independent of an external power source, significantly simplifying installation.

The DIN rail housing allows space-saving integration of the sensor into control cabinets or distribution boxes. With compact dimensions of 94 × 64 × 37 mm, the device fits perfectly into confined installation spaces. Thanks to the ability to daisy-chain multiple sensors via two RJ11 ports, several devices can be operated in sequence with minimal installation effort.

Technical Advantages of the 230V AC 1W-UNI

The sensor has been optimized for high precision and operational reliability under industrial conditions. It measures mains voltages from 100 to 250 volts AC with an accuracy of ±5% and a resolution of 1 volt. It supports both typical European 230V/50Hz systems and the 110V/60Hz grids commonly used in North America. This international compatibility makes the sensor appealing to companies with sites in different countries.

A measurement takes only about one second, ensuring that no significant fluctuations go unnoticed. Galvanic isolation prevents electromagnetic interference and ensures a long sensor life, even in environments with high electrical loads. For communication, the sensor uses the established 1-Wire UNI standard, which guarantees clear, stable, and easy-to-implement data transmission.

Integration into HW-group Systems

The 230V AC 1W-UNI sensor is fully compatible with HW-group products such as Poseidon2, Ares, and STE2. When combined with these devices, a professional energy monitoring system can be implemented that records voltage values in real time and issues alerts whenever they move outside defined limits. Using protocols such as SNMP or Modbus/TCP, the data can also be integrated into SCADA systems for centralized evaluation.

The free HWg-PDMS software supports analysis of the collected measurements, offers visualization options, and enables export to Excel. This makes it possible to create detailed reports for energy audits or for documentation purposes required by authorities and customers.

Typical Applications

• Server rooms and data centers: Monitoring input and output voltage on central IT hardware to prevent downtime.
• Industrial plants: Checking grid stability to ensure production quality and machine safety.
• UPS systems: Monitoring supply parameters in backup systems, early detection of battery issues.
• Energy monitoring: Integration into building management systems for analyzing energy flow and optimizing consumption.
• Remote monitoring: Automatic alerts via LAN, GSM, or cloud if voltage falls outside the target range.

Installation and Operation

Installing the HW-group Sensor 230V AC 1W-UNI is straightforward. The voltage source is connected via the input terminals, after which the RJ11 output is linked to the 1-Wire UNI input of the monitoring system. Since the sensor is bus-powered, there is no need to connect a separate power supply. DIN rail mounting is quick and tool-free, reducing installation time.

Once installed, the sensor can be configured through the central monitoring system. Threshold values can be set so that automatic notifications are sent via e-mail or SMS when they are exceeded. This allows for immediate intervention and protects sensitive equipment from damage.

Technical Specifications

• Input: 100–250 V AC (110V/60Hz and 230V/50Hz compatible)
• Accuracy: ±5%
• Resolution: 1 V
• Measurement duration: approx. 1 s
• Interface: 1-Wire UNI (2 × RJ11 for daisy-chaining)
• Power supply: Bus-powered (max. 100 mA)
• Operating environment: –30 °C to +85 °C, 0–100% RH
• Protection rating: IP20
• Dimensions: 94 × 64 × 37 mm
• Weight: 114 g
• Design: Suitable for DIN rail mounting

The HW-group Sensor 230V AC 1W-UNI provides a precise, safe, and flexible method for continuous voltage monitoring. With its galvanic isolation, international compatibility, easy installation, and seamless integration into HW-group systems, it is the optimal solution for IT, industrial, and energy supply applications. Combined with real-time monitoring and automatic alarms, it helps operators minimize risks and maximize operational safety.

Companies seeking to monitor their power supply at the highest level will benefit from the robust technology and reliable data output of this sensor. This makes the 230V AC 1W-UNI a valuable investment in safety and efficiency.