T5540 - Ethernet CO2 Sensor Alarm unit with LCD

T5540 - Ethernet CO2 Sensor Alarm unit with LCD
Our Price:  £287.00(£344.40 Inc. VAT)

CO2 Inputs:  1



1 in stock, immediate despatch

The T5540 is a Ethernet-based CO2 sensor featuring LCD for local display, email and SNMP under/over alarm, a built-in webserver for real time tabular and chart display. Also supports MODBUS protocol for SCADA compatibility. A low-cost solution for air quality monitoring and alarm for use in green-houses, data centres, museum, medical and industrial environment monitoring applications 

Special Offer:  Discounts of 7%, 10%, 12.5% and 15% are available when you order 10, 25, 50 and 100 items or more of this product.

  • Ethernet based CO2 alarm unit
  • CO2: 0 to 2000 ppm ±(50ppm +2% from reading)
  • High and low alarm limits
  • email or SNMP alarm notification
  • supports up to 3 email addresses
  • Web browser interface showing real time temperature and history chart
  • 1000 sample memory history - can export to Excel file
  • History record rate from 10 s to 18 h
  • Modbus TCP protocol for communication with SCADA software such as DAQFactory and LabVIEW
  • Standard RJ45 ethernet connector
  • Dimensions: 88 x 74 x 39,5 mm (W x H x D)

CO2 Sensor

A multiple point CO2 and temperature adjustment procedure leads to excellent CO2 measurement accuracy over the entire temperature working range; this is a must for process control and outdoor applications. The dual wavelength NDIR CO2 sensing procedure compensates automatically for ageing effects. The CO2 module is highly resistant to pollution and offers maintenance free operation and outstanding long term stability.

It is possible to read values from PC through the Ethernet connection. The following formats are supported:

  • www pages with user-design possibility
  • Modbus protocol
  • SNMPv1 protocol
  • SOAP
The instrument may send a warning message to several defined points if the measured value gets out of adjusted limits. There are the following possible ways to deliver the warning report:

to send an e-mail to maximum of three e-mail addresses
to send a SNMP trap to maximum of three IP addresses
to display an alarm state on the device www page
to send a message to Syslog server

Alarm limits may be set via the supplied TSensor program, Modbus or Telnet protocols. The alarm state may be read via the device www pages, Modbus or the SNMPv1 protocol. If channel isn’t wired, it is possible to turn off measured channel.

Web Interface

The T series has a built-in web server showing current temperature values, alarm limits alarm state and recorded history in both tabular and chart formats. It can be viewed by any web browser. Measured value is in graph displayed by green colour, error or not yet measured values are displayed as grey broken line. Upper (lower) alarm value is in graph displayed as red (blue) line. If all values are over upper (lower) limit, the alarm line will be in the bottom (top) graph part displayed. It is possible export history to CSV file (comma or dot decimal separator) for import to Excel.

Example Web Page >>

Alarm Reporting


When alarm limits are exceeded, an e-mail message is sent to addresses defined by the user (maximum three addresses). Maximum length of an e-mail address is 55 characters.


By means of the SNMPv1 protocol it is possible to find currently measured values and parameters concerning alarms. In case of alarm activation, warning message (a trap) can be sent to specified addresses. By means of the SNMPv1 protocol it is also possible to display history of last 600 measured values.


The device contains support for the Modbus protocol to communicate with control systems. The protocol runs in the RTU mode.


FREE LabVIEW examples using Modbus - For viewing of actual values and graphs following examples of application were created in LabVIEW 8.5


User Manual >>

TSensor Configuration Software >>

SensorReader - Datalogger Software >>

SNMP MIB Tables >>



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