Low cost, temperature, humidity, light and optional door contact remote monitor

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Key Features
  • Low Cost
  • Works out of the box
  • Attaches to a standard 10/100 Mbps Ethernet port
  • Embedded web server, no proprietary software
  • Communications via Ethernet
  • Sensors for temperature, RH and illumination
  • ES11 flood monitor option
  • ES01 LCD display accessories
  • Programmable email/text alerts
  • 24/7 monitoring
Buy Online
Part Number Weight Pack Qty Code Price (Ex VAT) Stock
EM01B Low cost environmental monitor EM01B STN
25g 1 31978 1+ £196.35 Yes (23)
5+ £173.25
10+ £153.62
25+ £132.83

Place your order before 2pm to select next day delivery. In a hurry? pre 10:30am delivery also available.


Remotely monitor Temperature, Humidity, Light and door access from just £250.00. With options to add the ES-Hub and have upto 6 flood sensors or 5 and an LCD display

The EM01b-STN is the entry level version of this very flexible temperature, humidity light and optional door contact remote monitor. Easy to use and set up the EM01b is exceptional value in remotely monitoring temperature and other parameters via a LAN connection. With its own web address, that is entirely configurable by the user as required, the EM01b works straight from the box.

For more advanced administrators the EM01b can be easily intergrated with NAGIOS®: which is a popular open source computer system and network monitoring software application. It watches, hosts and services the connected monitors, alerting users when things go wrong and again when they get better Click here for an overview of NAGIOS®.

The EM01b is a powerful websensor for Server Rooms, Warehouses and is being used extensively in the HVVAC (heating, ventilation, and air conditioning) Industry.

The Websensor is an environmental monitoring device designed for remotely monitoring of temperature, light and humidity in datacentres, server rooms - or any space that relies upon a steady and predictable environment and has access to the internet. The Websensor series are sensors with built-in signal conditioning and a web address. Users are able to access the sensor directly via PC and remotely monitor the data which can be viewed at any time through a web-browser and receive alarms via text or email.

The Websensor EM01B connects directly to your Ethernet network via a 10/100 Mbps switch or hub port. It provides monitoring for temperature, illumination (light level) and relative humidity and is ideal for monitoring environmental conditions in server rooms and wiring closets. It is capable of measuring DC voltages, which allows you to check battery supply voltages of UPS units or renewable energy sources. The new thermistor interface allows you to interface external special use sensors, such as liquid temperature measurement and the new contact closure detection allows you to detect door open conditions (for security purposes) or configure equipment start-up and shut-down conditions.


  • Detects contact closure (used to detect door opening) (Standard
  • External voltage measuring (0 to 18 VDC) see EM01bVM
  • External thermistor interface and additional temperature sensing see EM01bTherm.

The EM01B has an ESbus enabling other external sensors and displays ES01 LCD display and ES11 flood sensor to connect to the web for remote monitoring. Each EM01B with its ESbus is capable of handling up to six additional ESbus enabled sensors using the EShub. The EM01B is supplied complete with cables and power supply. All manuals and software are downloadable from this website.


All alerts are operated by Nagios. The plugins are available within the Software and Download section of this page.



  • Temperature range: -40 deg C to +60 deg C +/- 0.2 degC
  • Illumination range: 0 to 1000 LUX
  • Relative humidity range: 5 to 95% +/-3%
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