Ethernet & Web Sensors and Data Loggers

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An Ethernet sensor (also called a web sensor or IP sensor) connects straight to your network and serves live readings over a web browser, SNMP or Modbus TCP — no gateway or PC required.

Our COMET Ethernet web-sensor range measures temperature, relative humidity, CO2 and dew point — as ambient units, duct-mount probes, compressed-air transmitters and multi-channel web sensors, several with built-in relay outputs for local alarms.
Ethernet web sensors suit server rooms and data centres, cleanrooms, cold chain and warehouses, labs and building management — anywhere you need remote, networked monitoring with email/SNMP alerts and a downloadable record.

An Ethernet sensor (also called a web sensor or IP sensor) connects straight...

  • COMET T0510 Ethernet Ambient temperature

    COMET T0510 | Ethernet Ambient Temperature Sensor

    0 - 0 reviews

    Built-in sensor, range -30 to +80 °C

    $ 625.00 Ex. GST
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  • COMET T3511P Ethernet compressed-air temperature, humidity and dew point transmitter, to 25 bar.

    COMET T3511P | Ethernet Compressed-Air Temperature, Humidity & Dew Point Transmitter

    0 - 0 reviews

    Temperature, RH, Counted values (dew point…) tr…

    Price range: $ 1,209.33 through $ 1,266.67 Ex. GST
    Select options This product has multiple variants. The options may be chosen on the product page
  • COMET T5540 Remote CO2 concentration WebSensor with Ethernet interface.

    COMET T5540 | Ethernet CO<sub>2</sub> Sensor

    0 - 0 reviews

    WebSensor – Remote CO2 concentration…

    $ 985.00 Ex. GST
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  • COMET T5545 duct mount remote CO2 concentration sensor with Ethernet interface.

    COMET T5545 | Ethernet CO2 Sensor — Duct Mount

    0 - 0 reviews

    CO2 sensor | Range 0 – 2000 ppm

    $ 1,075.00 Ex. GST
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  • COMET T6540 Ethernet temperature, humidity, CO2 and dew point sensor with built-in probes.

    COMET T6540 | Ethernet Temperature, Humidity & CO<sub>2</sub> Sensor

    0 - 0 reviews

    Temperature, RH, CO2, Dew point

    $ 1,245.00 Ex. GST
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  • COMET T6545 duct-mount Ethernet temperature, humidity, CO2 and dew point sensor for HVAC ducts.

    COMET T6545 | Ethernet Temperature, Humidity & CO<sub>2</sub> Sensor — Duct Mount

    0 - 0 reviews

    Temperature, Relative Humidity, CO2

    $ 1,365.89 Ex. GST
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  • COMET P8610 Web Sensor with built-in temperature sensor and PoE.

    COMET P8610 | PoE Temperature Sensor

    0 - 0 reviews

    Temperature Web Sensor with PoE
    Measuring r…

    $ 575.00 Ex. GST
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  • Comet P8611 Ethernet Temperature and Humidity Sensor can measure temperature from -55 °C to +105 °C.

    COMET P8611 | PoE Temperature & Humidity Sensor

    0 - 0 reviews

    Web Sensor with PoE, one channel remote thermomet…

    $ 485.00 Ex. GST
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  • COMET P8641 Ethernet temperature and humidity sensor with 4 channels and Power over Ethernet.

    COMET P8641 | PoE 4-Channel Temperature & Humidity Sensor

    0 - 0 reviews

    Web Sensor with PoE, four channels remote thermom…

    $ 535.00 Ex. GST
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  • COMET P8652 PoE temperature and humidity sensor with three dry contact inputs for door and status monitoring.

    COMET P8652 | PoE Temperature & Humidity Sensor with 3 Dry Contact Inputs

    0 - 0 reviews

    Web Sensor with PoE – two channels with binary …

    $ 565.00 Ex. GST
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  • COMET H0530 Ethernet ambient temperature sensor with three dry contact inputs and two relay outputs.

    COMET H0530 | Ethernet Temperature Sensor with 3 Dry Contact Inputs & 2 Relays

    0 - 0 reviews

    Ambient temperature and 3 x binary input with Eth…

    $ 989.50 Ex. GST
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  • COMET H3530 Ethernet temperature and humidity sensor with three dry contact inputs and two relay outputs.

    COMET H3530 | Ethernet Temperature & Humidity Sensor with 3 Dry Contact Inputs & 2 Relays

    0 - 0 reviews

    Thermometer hygrometer with Ethernet interface an…

    $ 1,115.56 Ex. GST
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  • COMET H3531 Ethernet temperature and humidity sensor on remote probe cable with three dry contact inputs and two relay outputs.

    COMET H3531 | Ethernet Temperature & Humidity Sensor with Dry Contact Inputs & Relays — Remote Probe

    0 - 0 reviews

    Thermometer Hygrometer with Ethernet interface an…

    Price range: $ 1,200.00 through $ 1,249.50 Ex. GST
    Select options This product has multiple variants. The options may be chosen on the product page
  • COMET H3531P Ethernet compressed-air temperature, humidity and dew point sensor with three dry contact inputs and two relay outputs.

    COMET H3531P | Ethernet Compressed-Air Temperature, Humidity & Dew Point Sensor with Dry Contact Inputs & Relays

    0 - 0 reviews

    Compressed-air thermometer hygrometer with Ethern…

    Price range: $ 1,505.00 through $ 1,565.00 Ex. GST
    Select options This product has multiple variants. The options may be chosen on the product page
  • COMET H3531R rack-mount Ethernet temperature and humidity sensor with three dry contact inputs and two relay outputs.

    COMET H3531R | Ethernet Temperature & Humidity Sensor with Dry Contact Inputs & Relays — Rack-Mount

    0 - 0 reviews

    Rack mount thermometer hygrometer with Ethernet i…

    Price range: $ 1,265.00 through $ 1,319.50 Ex. GST
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  • COMET H4531 Ethernet temperature sensor for Pt1000 probes with three dry contact inputs and two relay outputs.

    COMET H4531 | Ethernet Pt1000 Temperature Sensor with 3 Dry Contact Inputs & 2 Relays

    0 - 0 reviews

    Thermometer with Ethernet interface and relays, f…

    $ 965.00 Ex. GST
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  • COMET H4531R rack-mount Ethernet temperature sensor for Pt1000 probes with three dry contact inputs and two relay outputs.

    COMET H4531R | Ethernet Pt1000 Temperature Sensor with Dry Contact Inputs & Relays — Rack-Mount

    0 - 0 reviews

    Rack mount thermometer with Ethernet interface an…

    $ 982.22 Ex. GST
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  • COMET H5521 remote CO2 concentration with Ethernet interface and two relays.

    COMET H5521 | Ethernet CO<sub>2</sub> Sensor with Relay Outputs — Remote Probe

    0 - 0 reviews

    Remote CO2 concentration with Ethernet…

    $ 2,415.00 Ex. GST
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  • COMET H5524 remote CO2 concentration with Ethernet interface and two relay outputs.

    COMET H5524 | Ethernet CO<sub>2</sub> Sensor with Relay Outputs

    0 - 0 reviews

    Remote CO2 concentration with Ethernet…

    $ 1,150.00 Ex. GST
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  • COMET H7531 Ethernet temperature, humidity and barometric pressure transmitter with three dry contact inputs, relay outputs and remote probe.

    COMET H7531 | Ethernet Temperature, Humidity & Barometric Pressure Transmitter with Dry Contact Inputs & Relays — Remote Probe

    0 - 0 reviews

    Thermometer hygrometer barometer with Ethernet in…

    Price range: $ 1,375.00 through $ 1,435.00 Ex. GST
    Select options This product has multiple variants. The options may be chosen on the product page
  • Choose by parameter (T, RH, CO2, dew point), mounting (wall, duct, probe) and outputs (web/SNMP/Modbus TCP, relays). We stock the COMET web-sensor family — T series with Temprature, Humidity, CO2 and pressure monitoring, H-series with relays — with local stock, calibration and support across Australia.

    Need Power over Ethernet? See our dedicated PoE Sensors range. For 4-20mA or 0-10V versions of the same measurements, see those output pages.

    Ethernet Sensors for Networked Monitoring

    Our Ethernet sensors connect straight to your LAN and serve live temperature, humidity, CO2 and pressure readings over a built-in web page, SNMP and Modbus TCP. No gateway or PC is required, and alerts go out by email or SNMP trap.

    Ethernet Temperature & Humidity Sensors

    The COMET T3510 and P8511 measure temperature and humidity (and derive dew point) over a standard Ethernet connection, with remote-probe and duct-mount options. Multi-channel and CO2 models add further parameters on the same network.

    Ethernet Web Sensors, Data Loggers & Relay Outputs

    From compact web sensors to multi-channel data loggers and H-series units with built-in relay outputs for local alarms, the range scales from a single point to a full 16-channel monitoring system. For Power-over-Ethernet models, see our PoE sensor range.

    Frequently Asked Questions

    What is an Ethernet sensor?

    An Ethernet sensor (or 'web sensor') plugs directly into your network and publishes live measurements over a web browser, SNMP or Modbus TCP. Unlike a standalone logger you download by USB, it is IP-addressable, so you can view readings and receive alerts from anywhere on the network.

    What can I measure with an Ethernet web sensor?

    Our COMET Ethernet range measures temperature, relative humidity, CO2 and dew point (and barometric pressure on some models), individually or combined. Options include ambient units, duct-mount probes, compressed-air transmitters and multi-channel web sensors — several with relay outputs for local alarms.

    Do your Ethernet sensors support SNMP and Modbus TCP?

    Yes. The COMET web-sensor range serves data over a built-in web server and supports SNMP and Modbus TCP, plus email and SNMP-trap alerts — so they integrate directly with BMS, SCADA and network-monitoring platforms such as PRTG or Nagios.

    Do these sensors support Power over Ethernet (PoE)?

    Many do — PoE models draw power and data from a single cable, ideal for ceilings, ducts and server racks. If PoE is your priority, see our dedicated PoE Sensors range for the full Power-over-Ethernet line-up. Non-PoE models run from a small DC adapter.

    Where are Ethernet web sensors typically used?

    Common applications are server rooms and data centres, cleanrooms, cold-chain and warehouse storage, laboratories, museums and building management — anywhere you need permanent, networked monitoring with remote access and alarms rather than periodic manual checks.

    What is the difference between an Ethernet sensor and a Wi-Fi or 4-20mA sensor?

    An Ethernet sensor uses a wired network connection for maximum reliability (and optional PoE power); Wi-Fi suits locations without cabling; and 4-20mA or 0-10V outputs feed a PLC/analogue input rather than a network. For 4-20mA or 0-10V versions of these measurements, see our dedicated output pages.

    Can one device monitor temperature and humidity together over Ethernet?

    Yes — several COMET web sensors log temperature and humidity (and derive dew point) in a single Ethernet unit, for example the T3610 or P8611. Multi-channel and CO2-capable models add further parameters on the same network connection.

    Do you stock and support Ethernet sensors in Australia?

    Yes. Pacific Sensor Technologies holds local stock, ships Australia-wide, and provides local calibration, configuration help and technical support — so setup advice and service don't depend on overseas turnaround.