Sensor 230V AC 1W-UNI: Precise voltage monitoring
€196.90
The galvanically isolated voltage sensor for mains voltage on the 1-Wire-UNI bus
The HW group Sensor 230V AC 1W-UNI measures the RMS value of the mains AC voltage from 100 to 240 V and outputs it in volts via the 1-Wire-UNI bus. The input is galvanically isolated from the 1-Wire bus, allowing the mains voltage to be safely decoupled from the monitoring electronics. The sensor is designed for DIN-rail mounting and occupies two modular units.
Typical applications include the detection of voltage fluctuations and power outages. The measured values are processed by Poseidon2 (LAN) or Ares devices (GSM) and are thus available for monitoring apps and portals. The sensor supports both 110 V/60 Hz and 230 V/50 Hz and is therefore suitable for grids in Europe as well as in North America.
Power is supplied directly via the 1-Wire-UNI bus (RJ11); a separate power supply is not required. Additional 1-Wire-UNI sensors can be connected in a daisy-chain configuration via the second RJ11 socket.
Reliable monitoring of mains voltage
The sensor provides a single, clearly defined measured value: the current mains voltage in volts.
Measuring range 100–240 V AC
For 110 V/60 Hz and 230 V/50 Hz grids; the input withstands voltages up to 250 V AC.
Accuracy 5 %, resolution 1 V
Sufficiently accurate to reliably detect under- and overvoltage as well as power outages.
Measuring period approx. 1 second
Fast update rate for timely detection of voltage fluctuations.
Galvanically isolated bus
The 1-Wire output is electrically isolated from the sensor’s power supply side.
Two RJ11 connectors
Daisy-chain capable: additional 1-Wire-UNI sensors can be easily connected in series.
How the Sensor 230V AC 1W-UNI is constructed
The slim DIN-rail housing combines the mains input and bus output on opposite sides and keeps both galvanically isolated.
DIN-rail housing, 2 modular units
The housing can be mounted on a DIN rail in a control cabinet and occupies two modules in width.
Mains connection L and N
On the top side are the labelled terminals for the phase conductor (L) and neutral conductor (N), to which the mains voltage to be measured is connected.
Two RJ11 sockets for the 1-Wire-UNI bus
On the underside are two RJ11 sockets: one for connection to the monitoring device, the second for additional 1-Wire-UNI sensors in series connection.
Galvanic isolation
There is electrical isolation between the mains input and the two 1-Wire sockets, so that no mains voltage reaches the bus.
Bus power supply
The sensor electronics are completely powered via the 1-Wire-UNI bus; an additional power supply is not required.
Overview of suitable evaluation devices and accessories
The Sensor 230V AC 1W-UNI is connected to a device with a 1-Wire-UNI input that evaluates and forwards the measured values.
Evaluation devices via LANPoseidon2 series
Displays the voltage in the web interface, alerts via e-mail or SMS outside the “SafeRange” and shares data via SNMP, XML (HTTP) and Modbus/TCP.
STE2 series
LAN or WiFi devices for remote monitoring with e-mail alarms and SensDesk connection.
Perseus series
Scalable LAN and LTE units for industrial, energy and environmental monitoring.
Ares 12 / Ares 12 LTE
Industrial remote monitoring for up to 14 sensors with battery backup, alarming via e-mail or SMS and SensDesk connection.
SD-2x1Wire
IoT device with LAN and WiFi connectivity that transmits up to four RJ11 sensor values (including voltage) to a portal.
NB-2x1Wire
IoT device with internal battery and NB-IoT mobile radio that transmits four RJ11 sensor values to a portal.
PowerEgg2 / Power Detector
Reports the presence of the supply voltage as a 0/1 signal to a digital input, for example on an Ares device.
30A AC Current probe 1W-UNI 2
Measures alternating current up to 30 A indirectly without interrupting the line – ideal as a complement to voltage measurement.
1W-UNI USB Calibrator
Compact USB device for setting and calibrating 1-Wire-UNI sensors.
1Wire HWg-Uni Calibrator
Software for setting and calibrating measured values, including changing the unit and exponent as well as a calibration curve with up to 8 points.
HWg-PDMS
Free software for analysing and exporting measurement data, for example to Excel for detailed reports.
Voltage monitoring via LAN or GSM
The manufacturer describes two typical setups that can be adopted directly.
LAN variant: Voltage measurement via SNMP
- The sensor measures the input voltage of a UPS (230 V AC; 110 V/60 Hz is also supported)
- Connection to a Poseidon2 device via the 1-Wire-UNI bus (RJ11)
- Additional sensors can be added via the second RJ11 socket in a daisy-chain configuration
- The device displays the voltage values in volts in the web interface
- Alarm via e-mail or SMS as soon as the voltage is outside the defined “SafeRange”
- Data provision in the LAN via SNMP, XML (HTTP) and Modbus/TCP
- Optional connection to the online portal SensDesk.com as well as display via Android or iOS app
GSM variant: Voltage detection and measurement via mobile radio
- A PowerEgg2 detector reports the presence of the supply voltage as a 0/1 signal to the digital input of an Ares device
- The Sensor 230V AC 1W-UNI measures the supply voltage in parallel (110 V or 230 V)
- Connection to an Ares 12 device via the 1-Wire-UNI bus (RJ11)
- The internal battery of the Ares device continues to supply the sensor even in the event of a power failure
- Alarm via e-mail or SMS as soon as the voltage is outside the “SafeRange”
- Connection to SensDesk.com as well as display in Android and iOS apps
Individually calibratable
If required, the sensor can be recalibrated and adapted to the respective measurement task.
- Calibration at up to 8 points of the measuring curve possible
- Setting via the 1Wire HWg-Uni Calibrator software or the 1W-UNI USB Calibrator
- Unit and exponent of the measured value can be changed directly in the sensor
- Conversion directly in the sensor ensures that the correct value also appears in e-mails, SMS and the web interface
Installation in a few steps
The sensor is quick to install and is powered via the bus.
- Mount the sensor on a DIN rail in the control cabinet
- Connect the mains voltage to the two input terminals L and N – exclusively by qualified specialist personnel
- Connect the RJ11 socket of the sensor to the 1-Wire-UNI input of the monitoring device; the sensor is powered via this connection
- If required, connect further 1-Wire-UNI sensors via the second RJ11 socket
- Define the desired “SafeRange” for under- and overvoltage in the monitoring device
- Set up alarming via e-mail or SMS and check the displayed voltage value
Manufacturer’s safety instructions
- The device complies with the applicable regulations and industrial standards of the Czech Republic and the European Union
- Do not use in case of visible damage, malfunctions or moisture
- Maintenance and repair exclusively by authorised personnel
- Input voltage and 1-Wire-UNI bus are galvanically isolated from each other
- CE declaration of conformity from the manufacturer is available
Manufacturer’s warranty
The manufacturer HW group grants a warranty of 24 months on the Sensor 230V AC 1W-UNI.
Why the Sensor 230V AC 1W-UNI is suitable
Mains voltage under control
Reliably detects under- and overvoltage as well as power outages.
Galvanically isolated
Mains voltage and 1-Wire bus remain electrically isolated from each other.
Worldwide use
Supports 110 V/60 Hz as well as 230 V/50 Hz.
No separate power supply
Bus-powered via the 1-Wire-UNI bus; no additional supply required.
Expandable via daisy-chain
Two RJ11 sockets for connecting additional 1-Wire-UNI sensors in series.
Flexible alarming
E-mail, SMS, SNMP and portal connection depending on the connected device.
Areas of application
- Monitoring of mains voltage fluctuations
- Long-term monitoring of mains voltage
- Detection of the presence of mains voltage
- Monitoring of the power supply at the input or output of a UPS
- Server rooms and data centres: safeguarding of IT infrastructure
- Industrial plants: detection of voltage dips and outages in production
- Energy monitoring in buildings and facilities
- BTS stations and technical sites with remote monitoring
The HW group Sensor 230V AC 1W-UNI combines galvanically isolated mains voltage measurement with simple integration into existing Poseidon2, Ares and STE2 systems – a practical solution for detecting voltage problems at an early stage and protecting critical systems.
Frequently asked questions
What is the Sensor 230V AC 1W-UNI and what is it used for?
The sensor measures the mains AC voltage from 100 to 240 V and outputs the value in volts via the 1-Wire-UNI bus. It is used to detect voltage fluctuations and power outages as well as to monitor UPS inputs and outputs.
Which devices can the sensor be connected to?
With HW group devices that have a 1-Wire-UNI input, for example Poseidon2 and STE2 via LAN, Ares via GSM or LTE, as well as SD-2x1Wire and NB-2x1Wire as IoT devices with portal connection.
Does the sensor require its own power supply?
No. The sensor is powered directly via the 1-Wire-UNI bus (RJ11). The mains voltage to be measured is only connected to the input terminals L and N.
Does the sensor also work in 110 V grids?
Yes. The sensor supports both 110 V/60 Hz and 230 V/50 Hz.
How accurate is the measurement?
The measuring accuracy is 5 % with a resolution of 1 V; the measuring period is approximately one second. If required, the sensor can be calibrated at up to 8 points.
What happens in the event of a power failure?
The connected evaluation unit reports the voltage drop or the value outside the “SafeRange” via e-mail or SMS. With Ares devices, the internal battery continues to supply the sensor even during a power failure.
Can additional sensors be operated on the same bus?
Yes. Additional 1-Wire-UNI sensors can be connected in a daisy-chain configuration via the second RJ11 socket.
How long is the warranty?
The manufacturer HW group grants a warranty of 24 months.
Questions about the Sensor 230V AC 1W-UNI?
Our support team in Germany will advise you free of charge on selection, installation and configuration.
Bus Properties:
- Bus Type: 1Wire-UNI (RJ11)
- Compatible Devices: Poseidon 2, Ares
- Connection: 2x RJ11 (sensors can be connected in series)
- Galvanic Isolation: Input voltage is galvanically isolated from the 1Wire-UNI bus
Voltage Measurement:
- Measurement Range: 100 to 240V AC (50Hz / 60Hz)
- Input Voltage Range: 100 to 250V AC
- Measurement Accuracy: 5%
- Resolution: 1V
- Measurement Period: Approximately 1 second
- Current Consumption: Max. 100mA
Mechanical Properties:
- Mounting: DIN rail (2-unit width)
- Dimensions: 88 x 64 x 37 mm
- Protection Class: IP20
- Housing: Suitable for DIN rail mounting
Environmental Conditions:
- Operating Temperature: -20°C to +80°C (-4°F to +175°F)
- Storage Temperature: -20°C to +80°C (-4°F to +175°F)
Applications:
- Monitoring of mains voltage fluctuations
- Long-term monitoring of mains voltage
- Detection of mains voltage presence
- Monitoring power supply at the input or output of a UPS
- Monitoring via LAN (Poseidon 2)
- Monitoring via GSM (Ares)
Safety Instructions:
- Device complies with applicable regulations and industrial standards of the Czech Republic and the European Union
- Do not use if visible damage, malfunction, or moisture is present
- Do not service by unauthorized personnel
- Galvanic isolation between input voltage and 1Wire-UNI bus
Monitoring devices
Other available sensors
Extension units
Accessories
Mounting Plate D Bracket for Ares and Poseidon2 Operating environment: -3°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 74 x 6 x 120 (W x H x D) / 58g Warranty: 24 months Wall mounting plate for Ares, Poseidon2 3266/68 and other products.
DB9 LapLink Cable 2m A LapLink cable (also known as Lablink or null-printer cable) is a cable used to connect two computers directly via a cable connection. Housing: Plastic Type: Cable
DIN-Rail Box Set A mounting kit for installing HW-group devices on a DIN rail. Applications and Use: Mounting kit for installing HW-group devices with metal housing on a DIN rail. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 45 x 11 x 105 (W x H x D) / 22g
Mounting Kit Screw set for mechanical mounting Applications and Use: Screw set for mechanical fastening
Mounting Plate E- 1U Rack (cabinet) mounting plate, 1U mounting for HW-group Ares and Poseidon2 devices Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 127 x 45 x 94 (W x H x D) / 137g Warranty: 24 months Rack (cabinet) mounting plate, 1U mounting for HW-group Ares, Poseidon2 3266/3268 and other products.
Mounting Plate L DIN Rail DIN rail mounting plate for Ares, Poseidon2 3268, and other products. Features: Metal housing Wall mounting Applications and Use: Profiles for metal-encapsulated HWg devices for wall mounting. Dimensions: 150 x 120 x 45 (W x H x D) / 65g Warranty: 24 months
Mounting Kit for Poseidon2 4002 and HWg-SMS-GW3 Applications and Use: Mounting kit for Poseidon2 4002 and HWg-SMS-GW3 Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 136 x 45 x 16 (W x H x D) / 165g Warranty: 24 months
Rack Shelf 1U A versatile solution for easy mounting of HW-group devices in 1U racks. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 485 x 44 x 104 (W x H x D) / 597g Warranty: 24 months Housing: Metal Type: Wall mounting This shelf makes it easy to use devices in racks. You can even combine different 1U products and sensors.
Software
Manufacturer information:
HW group s. r. o.
Rumunská 26
Prague, 120 00
Czech Republic
Phone: +420 222 511 918
Email: sales@hwg.cz
Responsible person:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
