Top products

HWg-STE / HWg-STE plus
Ethernet Web thermometer/hygrometer
HWg-Ares 12
GSM thermometer, Email (GPRS) & SMS
Poseidon2 xxxx
Sensors + I/O over Ethernet (Web, SNMP)
Damocles xxxx
I/O over Ethernet (SNMP, Modbus/TCP)
Serial port I/O over IP RS-232/485 + I/O over Ethernet icon
Water leak detector (WEB, SNMP, relay)
HWg-PWR 3/12/25
M-Bus to Ethernet smart gateway

On-line demos

HWg-STE Prague

Poseidon model 2250 Prague

Poseidon model 3268 Prague

Damocles model 2404 Prague

IP WatchDog Lite Prague

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What's new

21. 8.2014
New accessory: Rack Shelf 1U
The brand new Rack Shelf 1U is a versatile solution for mounting HW group devices to 1U shelves easily.
Rack Shelf 1U makes using HW group products in racks easy. You can even combine different 1U products and sensors.

5. 8.2014
New features in Ares: GSM monitoring
The HWg-Ares12 and Ares14 GSM monitoring products have several new features:
Overview of added features:
Pulse counters DI inputs (You can connect S0 energy meters). Periodic emails & connectivity to HWg-PDMS software. HWg-Push protocol implemented, Ares devices can be connected to the portal. Ares devices are fully configurable via WEB of the portal now.

22. 5.2014
CS46: Saving energy in a retail chain
Case Study: The customer runs a network of dozens of retail stores. The mother company pays all operating costs, including the energy/utility bills. In the light of increasing energy prices, the customer started to look for ways of reducing the energy costs.

13. 5.2014
Sensor 230V AC 1W-UNI: Measuring 100 to 250V AC voltage
Sensor for measuring and remote monitoring of 110/230V AC supply voltage. Its output is the voltage in [V].

12. 5.2014
HW group at the SENSOR+TEST 2014 trade fair
HW group on SENSOR+TEST 2014 fair in Nuremberg (3.-5.6.2014).
We would like to invite you to our Stand 470 in Hall 12. We will exhibit there with the LUCOM company.

News archive


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HW group produces IP-enabled sensors

HW group s.r.o. is a manufacturer of sensors with IP interface. We provide solutions for remote monitoring and remote control over M2M. Our products are designed for IT, datacenters, industrial and security applications. More about us

HWg-SMS-GW2 is a gateway that enables HW group products to send text message alarms. Send SMS alarms from all HW group products in your LAN. No software needed, works over a LAN at the Box-2-Box (Peer-to-Peer) level. Save administration costs and effort – use only a single SIM for all your devices.

Applications of our products:

Temperature monitoring over Web, SNMP, e-mail

The HWg-STE IP Thermometer enables remote temperature monitoring over a LAN. If the system overheats or a temperature is exceeded, an e-mail alert is sent. Supplied with the HWg-PDMS software for Windows – charts, export to MS Excel.

  • E-mail alerts to faulty air conditioning
  • Alerts to equipment overheating (server, disk array)
  • Alerts to rising temperature in a room
  • Quick and easy installation (DHCP supported)
  • Connects to SNMP monitoring systems
  • Free HWg-PDMS software for Windows (MS Excel exports)

>> more about HWg-STE  

Temperature monitoring in refrigerators and cooling boxes

A Poseidon 2250 unit monitors storage conditions for food or pharmaceuticals. Up to 30 probes can be connected – temperature, humidity, air pressure, door contacts.

  • Values are logged in the internal memory.
  • Temperature probes use a thin, flat cable that can lead through the door sealing. No need to drill a hole into the refrigerator or worry about batteries.
  • Alerts by e-mail or SMS (text message) if the refrigerator door is not fully closed.
  • Connects to SNMP monitoring systems.
  • Readings can be processed with the supplied HWg-PDMS software (Windows) or with third party software.
  • A GSM modem can be connected in order to alert the responsible person to electricity outages by text messages (SMS).

>> more information  

Poseidon 4002 – Rack Monitoring System

A Poseidon 4002 unit with various sensors and probes (temperature, humidity, door contacts, power supply, water flood) monitors the environment inside a 19" cabinet.

It can report over SNMP to any datacenter or IT monitoring system.

  • Two different people can be alerted by SMS (text message) to an electricity outage or phase loss
  • You immediately know when someone opens the cabinet (SNMP Trap, pop-up window)
  • E-mail alerts you in time to rising temperature
  • You can check the cabinet status remotely over the Web
  • You can remotely restart a server or switch on air conditioning

>> more information  

Water flood detection

Water or any other conductive liquid is detected along the entire length of the WLD sensing cable.
The WLD sensing cable can be extended with a regular cable. This allows for optimizing the costs for a detection zone.

Examples of use:
  • Water detection under raised floors
  • Leaky pipe detection (cable routed along the pipe)
  • Detection of liquids in drip trays
  • Water leak from air conditioning units

Flood detection outputs:


Electricity consumption metering

HWg-PWR collects data from meters over M-Bus (data are logged into the internal memory). Consumption charts can be plotted over the Web, e-mail alerts to overcurrent can be configured.
HWg-PWR can send detailed billing information every month. With a certified M-Bus electricity meter, costs can be directly invoiced, or cos Phi monitored.

M-Bus meters are not limited to electricity meters. M-Bus heat meters, gas meters or water meters can be also connected. HWg-PWR is an intelligent gateway for connecting any M-Bus meter to your LAN.

>> more about HWg-PWR  

Box-2-Box: Relay control over LAN

Two I/O Controller units can be connected against each other over a LAN. Digital inputs are then connected over the network to relay outputs. The delay is approximately 200ms. With a remote LAN relay, it is possible to switch any device on or off.

  • Each unit can connect to the remote unit
  • When the power fails and is restored, the unit automatically retrieves input states from the remote unit
  • Uses a Telnet-like protocol with optional security enhancements

>> I/O Conroller overview  

Target segments of our solutions


IP-enabled sensors