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WEB SENSORS – Ethernet and communication

WEB SENSORS – Ethernet & Communication

Web sensors from our partner COMET System allow precise measurements of temperature and (relative) humidity. The latter is achieved by the possibility of connecting two probes, allowing temperature and humidity measurements in two different locations with a single device.

COMET System from the Czech Republic has been creating innovative control solutions by producing data loggers since 1991. These are used to document environmental conditions in production plants, warehouses and the cold chain. COMET instruments are characterised by high-quality measurement components, precision measurement and monitoring. The monitoring process consists of measuring, recording and managing data. Depending on the stability of the data, criteria for triggering alarms are set.

Web sensors offer the possibility to connect three binary inputs. These are the only ones that allow data or values to be extracted from dry contacts or binary sensors with a voltage output. The type of binary input is determined programmatically in the device.


  • operating temperature: -30 … +80 °C
  • Output: Ethernet (PoE)
  • communication protocol: www, ModBusTCP, SNMPv1, SOAP, XML
  • alarm protocols: e-mail, SNMP Trap, Syslog
  • Power: PoE or 5 V DC
  • IP degree of protection: IP30


Online monitoring of current measured values using sensors with Ethernet output. Continuous monitoring of critical parameters such as temperature and relative humidity can be very easily done with online sensors that also measure CO2 concentration, atmospheric pressure, monitor events and read a 4 … 20 mA signal.


COMET Cloud is a unique platform that enables the collection, storage and analysis of data provided by COMET measuring instruments. The stored data can be processed and printed. You can create tables, graphs and reports.
COMET Cloud also sends alarms by email when the values measured by the device exceed pre-set ranges.

COMET Cloud version 2.1 supports the following device families:
– IoT wireless sensors powered by Sigfox
– IoT wireless data loggers with built-in GSM modem
– WiFi sensors
– Web sensors (t-line, p-line, h-line)
COMET Cloud is also available for new and older devices.

The price includes a FREE 3-month voucher for COMET Cloud. You can also request a voucher for previously purchased devices. This allows you to test the features of the COMET Cloud platform at no extra cost. After the trial period, you can renew your subscription with a top-up voucher.


High precision humidity and temperature sensors, modularity and multi-connectivity. The sensors come with a warranty and a technical data sheet. Basic configuration is done using the T-sensor software or via a web browser.

The web sensor is compatible with the COMET Database Manager software, which includes the COMET Database Viewer licence and allows:

  • data tracking, creating reports, printouts, charts, graphs, exporting data
  • SMS alarms and email notifications
  • data collection
  • easy and fast access to data
  • data storage
  • easy installation
  • support on Microsoft server, optionally also in MS SQL Server Express
  • 30-day free trial


At the ELPRO Calibration Laboratory, which is accredited to SIST EN ISO/IEC 17025:2017, we can also calibrate your sensors.

For use in:

construction, infrastructure, heavy industry, meteorology, pharmaceuticals, laboratories, warehouses and wherever optimum humidity and temperature conditions need to be ensured.

Author Katarina Žunko, source COMET Systems
July 2020

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