Bezrucova 2901
756 61  Roznov pod Radhostem
Tel.: +420 571 653 990



Multiloggers Transmitters
And Regulators
Recorder with Printer

H5524- remote CO2 concentration with Ethernet interface and two relays

code: H5524
CO2 level transmitter with two output relays.

carbon dioxide

The CO2 measurement is based on a 2-source, 2-beam process. CO2 measurement with long-term stability is guaranteed thanks to the proven non-dispersive infrared (NDIR) CO2 measurement cell. The unique patented auto-calibration procedure compensates for aging of the infrared source and guarantees high reliability, long term stability and eliminates the need of periodical recalibration in the field.

 Included in delivery:


Transmitter is also equipped with three alarm LEDs:

Green LED shines - CO2 concentration 0 to 1000 ppm

Yellow LED shines - CO2 concentration 1001 to 1200 ppm

Red LED shines - CO2 concentration 1201 ppm and more

Send request



  • Building management
    The CO2 - carbon dioxide level is recently regarded as an important parameter that substantially determines the quality of the interior climate. Especially in buildings where many people gather, such meeting rooms, hospitals, schools, cinemas, theatres and care centres. With the help of CO2 sensor engineers, technical advisors, environmental experts and health specialists can optimize the ventilation for creation of a healthy interior climate.
    CO2 monitoring of buildings, history data to Comet Database, remote alarm by email or SMS

  • Warehouses
    CO2 monitoring of storage, history data to Comet Database or 3rd party SCADA system

  • Factories and manufacturing
    CO2 monitoring for food processing industry, pharmaceutical industry, etc.

P8541 demo


Carbon dioxide sensor Relay LCD Acoustic EthernetWWW
Email CSV Modbus SNMP TrapSOAP
Syslog SNTP

Online Ethernet Monitoring system


  • Comet Database
    Complex solution for data acquisition and analysing. Easy to use and high flexible database software for Comet Sensors.

  • T-Sensor software
    Free configuration utility for COMET sensor.



CO2 concentration
Carbon dioxide sensor 

Method of CO2 sensor multipoint calibration leads to an excellent accuracy measurements of CO2 in the entire of operating temperature range. With this sensor is the device able to meet the demanding requirements for outdoor use. The measurement principle is based on the NDIR principle  with dual wavelength, which automatically compensates for aging of the sensor. The sensor is resistant against the pollution and provides maintenance-free operation and excellent long-term stability.

Releay outputs
Relay Two relay output for alarming or external device control. It is possible to assign any input value to each relay. Relay can be remotely controlled using ModbusTCP communication protocol.
Dual line LCD
LCD Large dual line LCD for simultaneous display of CO2. Displayed values are user selectable. Display can be switched off.
Acoustic alarms
Acoustic Acoustic signalisation can be activated after exceeding set limits. Alarm can be confirmed (deactivated) from device keyboard.
Ethernet interface
Ethernet 10Base-T/100Base-TX Ethernet interface via standard RJ45 connector. IP address can be obtain automatically from DHCP server or set manually. Internet protocol version 4 is supported only.
WWW server
WWW Current values are available via embedded web server. Design of the web pages is can be changed according user requirements.
Email Warning email are sent when measured value exceed selected limits. SMTP authentication is supported, but SSL not.
History export to CSV
CSV History values can be exported for next processing by the CSV file. CSV file can be processed inside spreadsheet application like Microsoft Excel or OpenOffice Calc. Two formats of CSV file are supported - dot and comma decimal point separators. Timestamps inside CSV file are shown when device time is synchronised by the SNTP server.
ModbusTCP protocol
Modbus Modbus protocol for communication with SCADA systems or third party software. Device use Modbus TCP protocol version.
SNMP protocol
SNMP SNMP version 1 protocol for IT infrastructure. Using SNMP protocol you can read actual measured values, alarm status and alarm parametersVia SNMP protocol is also possible to get last 1000 measured values from history table. MIB tables with OID description are available..
Trap SNMP Trap for IT infrastructure. The device allows sending Traps to selected Trap receiver server. Traps are sent in case of alarm on channel or at error states.
SOAP protocol
SOAP The device allows to send currently measured values via SOAP v1.1 protocol. The device sends values in XML format to the web server. The advantage of this protocol is that communication is initialized by the device side. Due to it is not necessary use port forwarding.
Syslog protocol
Syslog Syslog protocol for IT infrastructure monitoring systems. The device allows sending text message to selected Syslog server. Messages are sent in case of alarm on channel or at error states.
SNTP protocol - time synchronization
SNTP Time synchronisation with SNTP server. Actual time is shown at web pages and is necessary for timestamps inside CSV files.


Technical Data

Technical parameters Value
Output Ethernet
Measured Value CO2
Construction Type Ambient Air
Design Industrial
Temperature Measuring Range to °C
Relay Output Yes
Two-State Input No
Lcd Display Yes
PoE No
Range of CO2 concentration measurement 0 to 2000ppm
Accuracy of CO2 concentration measurement ±(50ppm +2% from reading) at 25°C and 1013hPa
Optional range of CO2 concentration measurement 0 to 10000ppm ±(100ppm +5% from reading) at 25°C and 1013hPa
Resolution 1ppm
Measuring interval 15s
Temperature operating range -30 to +60°C
IP protection IP30
Number of relay outputs 2
Maximum switching voltage, current and power of relay output 50V, 2A, 60VA
Audible alarm built-in beeper - switchable
LAN connection RJ-45 connector, 10Base-T or 100Base-TX
Communication protocols WWW, ModbusTCP, SNMPv1, SOAP, XML
Alarm protocols E-mail (SMTP authentication is supported), SNMP Trap, Syslog
Configuration WWW interface, T-Sensor
Power 9 to 30Vdc, power consumption approximately 1W
Power connector co-axial, diameter 5.5 x 2.1mm
Dimensions 136 x 150 x 45mm (W x H x D)
Weight approximately 320g
Warranty 3 years
Comet Database Comet Database
code: CDB
System for collecting, alarming and analysing of measured data from all COMET devices.
H7530 - thermometer hygrometer barometer with Ethernet interface and relays H7530 - thermometer hygrometer barometer with Ethernet interface and relays
code: H7530
Ambient temperature, relative humidity, atmospheric pressure with two relay outputs. Humidex reading.
H6520 - remote CO2 concentration thermometer hygrometer with Ethernet interface and two relays H6520 - remote CO2 concentration thermometer hygrometer with Ethernet interface and two relays
code: H6520
Temperature, humidity, CO2 level sensor with two output relays. Humidex reading.
Web sensor T5540 - remote CO2 concentration with Ethernet interface Web sensor T5540 - remote CO2 concentration with Ethernet interface
code: T5540
CO2 - carbon dioxide t-line Web sensor. Remote alarm.
Ethernet Multilogger M1440 - thermo-hygro-CO2 meter with 4 MiniDIN Ethernet Multilogger M1440 - thermo-hygro-CO2 meter with 4 MiniDIN
code: M1440
Universal datalogger with 4 hardware inputs and external CO2 probe with 1 meter cable.
Multilogger can be installed permanently to Ethernet network or work as portable device.
Included is traceable calibration certificate in accordance with EN ISO/IEC17025.