STE2 R2 is reliable environmental monitoring for remote locations. LAN & WiFi, Email alerts, SNMP monitoring or cloud service available. External RJ11 sensors (up to 5 sensor values) and On/Off detectors (2x DI - Digital Input) can be connected.

The STE2 R2 package includes a power adaptor and 3m temperature outdoor sensor for remote temperature measurement.
Sensor values are displayed via the device's web interface, in SNMP or XML API, on the Portal or HWg Monitor mobile app. Device can be connected to the network via WIFI or LAN (RJ45) with PoE power support.

  • Connectivity: LAN, WiFi
  • 2x RJ11 port (1W-UNI) up to 5 sensor values in total
  • 2x DI (Digital input) for dry contacts
  • Temperature sensor (IP67 - 3m) included in the retail package
  • Power adapter (International = EU, UK, US) included in the retail package
  • SMS messages & Voice Calls available with SMS-GW (external device) or Portal usage
  • Product with OPEN API (SNMP, XML) SNMP, PoE (Power Over Ethernet) supported
  • Default portal (optional): (free service)
  • Compatible portals: SensDesk Technology
  • Mobile App: HWg Monitor (LAN or Portal connectivity)
Applications and usage: 
  • Remote datacenter environment monitoring & alerting
  • Detection of water leakage (spot/sensing cable detector)
  • Remote temperature monitoring in IT
  • Remote air conditioning control (A/C unit cooling failure alert)
  • Food / Drug storage (control of storage conditions, creation of HACCP logs using application software)
  • Monitoring of temperature, relative humidity, electric current, CO2

Horizontal menu


Additional sensors can be connected to a second RJ11 sensor port (% RH, Cryo temperatures, CO2, VoC, 4-20mA, water flood, …). RJ11 sensors can be daisy-chained or one physical sensor can measure several values (°C + %RH + VoC = 3 values).

Up to 5 external RJ11 sensor values in total can be connected to STE2 R2.

Compatible Sensors & Detectors


Up to 5 external sensors (RJ11) + 2 DI detectors can be connected to the STE2 R2 device. 



Setting the device

  • Connect the STE2 R2 Thermometer to the network via a LAN or by using the built-in WiFi antenna.
  • The device has a built-in WEB server, you will need only a standard web browser. HTTPS is also supported.
  • Connect external sensors + detectors
  • Define Alerts
    • The device will alert you by email when the sensor value exceeds "Safe range" or the DI input is closed.
    • Email can be delayed or sent periodically. STE2 R2 supports also TLS so the Gmail SMTP servers can be used.
    • Use external SMS- GW3 for SMS alerts


Alarming and displaying of sensor values

When the measured temperature (Relative Humidity, Voltage, ..) on the external sensor(s) exceeds the defined Min-Max range (Safe Range), the STE2 device sends an email alert.

Email alerts from the device

  • Use 3rd party SMTP server and send email alerts from the STE2 device directly.
  • For long-term alerting stability be careful about using "public webmail" SMTP server like and others. We do not recommend using these services, they are changing their security requirements in time and customers can simply lose alarm from the device.
  • We recommend using the Portal ( for free) & send email alerts from the Portal. It's long-term and more reliable.

Alerting via external SMS Gateway

  • SMS-GW3 or SMS-GW3 LTE are physical gateway devices from HW group with LAN interface.
  • One SMS GW can be used for forwarding alerts from several devices on the same LAN.
  • An alert can be sent as SMS or Voice call to a defined phone number.
  • No portal or software is required.

Sensor values display in your pocket (on the wall): HWg Monitor

  • The HWg Monitor is a Mobile App (Android or iOS) for displaying of sensor values
  • Data input: LAN devices (All HWg products) / Portal user account
  • All sensor values are on one screen.
  • Showing preferred sensors on the widget.

Free Portal service:

  • The is a free service from HW group for up to 20 devices in one user account.
  • Alerting: An email alert can be sent from the portal (higher long-term reliability compared to public SMTP server)
  • Alerting: Device Invalid (disconnected) alert from the portal is available
  • Simple alarm escalation is available (emails only)
  • Sensor value graphs are available
  • Switching remote relay output based on sensor values.
  • Central alerts overview & management.

Paid Portal service (Portal providers)

  • SensDesk Technology portal (SaaS or On-premise)
  • Email, SMS, Voice call alerts
  • Multi graphs with several years of history
  • User account API: SNMP or XML
  • Reports (PDF)
  • Multi-users accounts
  • Check the Portal Providers list to find your local service provider.


Follow our application notes


Hwg Video Flyer about STE2 R2 monitoring device

STE2 Video manuals

To give you a closer look at how STE2 device works, we have prepared a new series of video manuals. In these videos, we will explore the STE2 r2 device in more detail.

>> View the whole STE2 R2 video manual series

>> Watch the STE2 playlist on HWg YouTube channel

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