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Combined Sensor with Two Pt1000 Inputs and One Input for Digital Probes, Ethernet Output and PoE

Combined Sensor with Two Pt1000 Inputs and One Input for Digital Probes, Ethernet Output and PoE

The TA3645 model represents a hybrid Ethernet sensor that combines two highly accurate analog inputs for Pt1000 resistance probes with one digital input (for T+RH or CO2 probes).

Thanks to this configuration, the TA3645 is a universal monitoring device capable of measuring in the extreme range of -200 °C to +260 °C with an accuracy of ±0.2 °C.

The device is an ideal solution for demanding applications in healthcare or industry: Pt1000 inputs reliably monitor refrigerators, freezers, cryogenic boxes, or ovens, while the digital probe simultaneously monitors the room climate (temperature, humidity, or CO2).

For convenient operation and easy integration, the TA3645 offers a large backlit LCD display, acoustic alarm signaling, and PoE support. It also features a cable resistance compensation function for Pt1000 probes directly from the web interface.

Main Benefits:

  • 2x Pt1000 input + 1x digital T+RH or CO2 probe
  • Extreme temperature measuring range from -200 °C
  • Backlit LCD display, acoustic and LED alarm signaling
  • Power supply 5–24 V or PoE
  • Integrated backup memory
  • Modern web interface, IPv4/IPv6 support, Modbus TCP, COMET Cloud, and fully encrypted communication (HTTPS, SNMPv3, TLS)
  • Integrated detachable bracket for easy installation

  • code
    TA3645
  • Warranty
    3 years
Add to quote

Technical data

Measured value

Temperature
Relative humidity
Counted values (dew point…)
CO2

TEMPERATURE SENSOR

Measuring range Depending on the connected Pt1000 probe
Accuracy Depending on the connected Pt1000 probe
Resolution 0.1 °C

HUMIDITY SENSOR

Measuring range Depending on the connected DSxx probe
Accuracy Depending on the connected DSxx probe
Resolution 0.1% RV

DEW POINT

Measuring range Depending on the connected DSxx probe
Accuracy Depending on the connected DSxx probe
Resolution 0.1 °C

CO2 SENSOR

Measuring range 0 to 10,000 ppm
Accuracy ±(100 ppm + 5% of reading) at 23 °C and 1,013 hPa
Resolution 1 ppm
CO2 probe cable length 1, 2 or 4 meters

GENERAL TECHNICAL DATA

Operating temperature range -30 to +60 °C
Measurement channels 2× Pt1000 inputs + 1× digital T+RH or CO₂ probe, CINCH / ELKA connectors
Calculated values dew point temperature, absolute humidity, specific humidity, mixing ratio, specific enthalpy, humidex, heat index
Supported temperature units degrees Celsius (°C), degrees Fahrenheit (°F)
Temperature compensation of the humidity sensor across the entire temperature range
Power supply Power over Ethernet (IEEE 802.3af) or 5–24 V DC
Network interface Ethernet
IP support IPv4, IPv6
Communication protocols HTTP(s), Web server (WWW), HTTP GET (JSON, XML), Modbus TCP, SNMPv1, SNMPv2c, SNMPv3
Alarm protocols Email (SMTP), Syslog
Measurement interval 2 s
Ingress protection (IP rating) IP30 (electronics)
Dimensions 116 × 85 × 42 mm (without connected probe)
Weight 220 g
Warranty 3 years

Premium Ethernet Sensors with Display and Local Signaling

The TAx6xx series represents a new generation of Web Sensor 2.0 premium sensors. They combine precise measurement, modern network communication, and local monitoring via an LCD display, LED signaling, and an acoustic alarm.

Ideal solution for:

  • server rooms and data centers
  • laboratories and healthcare
  • industrial facilities
  • offices, schools, and public buildings
  • cleanrooms

Why choose TAx6xx?

Local monitoring without a PC

  • Backlit segmented LCD display (4 brightness levels)
  • Display of values, alarms, and IP address
  • Three-color LED signaling (green / yellow / red)
  • Acoustic alarm with local and remote mute options

Advanced next-generation alarms

  • 2 adjustable alarms per channel (no direction limits)
  • System alarms (measurement, time, or configuration error…)
  • Signaling via: o LED o acoustics o e-mail (TLS / STARTTLS) o SNMP trap o Syslog

Calculations and advanced analytics

  • Dew point
  • Absolute humidity
  • Specific humidity
  • Mixing ratio
  • Enthalpy
  • Humidex and Heat Index
  • Inter-channel calculations (e.g., temperature difference, CO₂ difference)

Maximum connectivity and security

  • HTTP / HTTPS (custom certificate upload)
  • SNMP v1 / v2c / v3 (SHA, AES128)
  • Modbus TCP (including alarm mute and limit changes)
  • IPv4 + IPv6
  • COMET Cloud / COMET Database
  • TLS communication
  • 4 user accounts, 3 permission levels
  • Firmware updates via web

Power without compromises

  • 5–24 V DC
  • PoE (IEEE 802.3af)
  • RTC with battery backup
  • Backed-up memory (>2600 records)

Typical applications

Data centers

  • Monitoring of temperature, humidity, and CO₂ with instant LED indication.
  • Laboratories: High-precision Pt1000 inputs, cable compensation, alarms.
  • Schools and offices: CO₂ air quality "traffic light" for ventilation control.
  • Industry: Durable solution with PoE and SCADA integration.

The new platform brings:

  • new compact design
  • removable bracket for easy mounting
  • unified firmware
  • enhanced cybersecurity
  • RTC with battery
  • advanced alarm system

Optional accessories and download

Temperature probe Pt1000TG8/C, CINCH connector

Temperature probe Pt1000TG8/C, CINCH connector

Temperature range: -80 to 200°C
code SN104C
Temperature probe Pt1000TG8/C, CINCH connector, cable 2 meters

Temperature probe Pt1000TG8/C, CINCH connector, cable 2 meters

Temperature range: -80 to 200°C
code SN105C
Temperature probe Pt1000TG8/C, CINCH connector, cable 5 meters

Temperature probe Pt1000TG8/C, CINCH connector, cable 5 meters

Temperature range: -80 to 200°C
code SN108C
Temperature probe Pt1000TG8/C, CINCH connector, cable 10 meters

Temperature probe Pt1000TG8/C, CINCH connector, cable 10 meters

Temperature range: -80 to 200°C
code SN113C
Temperature probe Pt1000TG7/C, CINCH connector

Temperature probe Pt1000TG7/C, CINCH connector

Temperature range: -50 to 200°C
code SN164C
Temperature probe Pt1000TG7/C, CINCH connector, cable 2 meters

Temperature probe Pt1000TG7/C, CINCH connector, cable 2 meters

Temperature range: -50 to 200°C
code SN165C
Temperature probe Pt1000TG7/C, CINCH connector, cable 5 meters

Temperature probe Pt1000TG7/C, CINCH connector, cable 5 meters

Temperature range: -50 to 200°C
code SN166C
Temperature probe Pt1000TG7/C, CINCH connector, cable 10 meters

Temperature probe Pt1000TG7/C, CINCH connector, cable 10 meters

Temperature range: -50 to 200°C
code SN167C
Temperature probe 2304-220/C, CINCH connector, cable 1 meter

Temperature probe 2304-220/C, CINCH connector, cable 1 meter

Temperature range: -30 to 220°C
code SN168C
Temperature probe 2021-150/C, CINCH connector, cable 1 meter

Temperature probe 2021-150/C, CINCH connector, cable 1 meter

Temperature range: -30 to 150°C
code SN169C
Temperature probe PTS350A-2/C, CINCH connector, cable 2 meters

Temperature probe PTS350A-2/C, CINCH connector, cable 2 meters

Temperature range: -30 to 130°C
code SN170C
Temperature probe 2034-220/C, CINCH connector, cable 1 meter

Temperature probe 2034-220/C, CINCH connector, cable 1 meter

Temperature range: -30 to 150°C
code SN175C
Ambient temperature probe, 200-80/C

Ambient temperature probe, 200-80/C

Temperature range: -30 to 80°C
code SN177
Temperature probe 2061-200/C, CINCH connector, cable 1 meter

Temperature probe 2061-200/C, CINCH connector, cable 1 meter

Temperature range: -50 to 200°C
code SN178C
Temperature probe 2061-200/C, CINCH connector, cable 2 meters

Temperature probe 2061-200/C, CINCH connector, cable 2 meters

Temperature range: -50 to 200°C
code SN179C
Temperature probe 2061-200/C, CINCH connector, cable 5 meters

Temperature probe 2061-200/C, CINCH connector, cable 5 meters

Temperature range: -50 to 200°C
code SN180C
Temperature probe 2061-200/C, CINCH connector, cable 10 meters

Temperature probe 2061-200/C, CINCH connector, cable 10 meters

Temperature range: -50 to 200°C
code SN181C
Temperature probe PTS350A-5/C, CINCH connector, cable 5 meters

Temperature probe PTS350A-5/C, CINCH connector, cable 5 meters

Temperature range: -30 to 130°C
code SN182C
Temperature probe PTS350A-10/C, CINCH connector, cable 10 meters

Temperature probe PTS350A-10/C, CINCH connector, cable 10 meters

Temperature range: -30 to 130°C
code SN183C
Temperature probe Pt1000TGL40/C, CINCH connector, cable 1 meter

Temperature probe Pt1000TGL40/C, CINCH connector, cable 1 meter

Temperature range: -30 to 80°C
code SN185C
Temperature probe Pt1000TGL40/C, CINCH connector, cable 2 meters

Temperature probe Pt1000TGL40/C, CINCH connector, cable 2 meters

Temperature range: -30 to 80°C
code SN186C
Temperature probe Pt1000TGL40/C, CINCH connector, cable 5 meters

Temperature probe Pt1000TGL40/C, CINCH connector, cable 5 meters

Temperature range: -30 to 80°C
code SN187C
Temperature probe Pt1000TGL40/C, CINCH connector, cable 10 meters

Temperature probe Pt1000TGL40/C, CINCH connector, cable 10 meters

Temperature range: -30 to 80°C
code SN188C
Temperature probe Pt1000TR160/C, CINCH connector, cable 1 meter

Temperature probe Pt1000TR160/C, CINCH connector, cable 1 meter

Temperature range: -30 to 80°C
code SN199C
Temperature probe Pt1000TR160/C, CINCH connector, cable 2 meters

Temperature probe Pt1000TR160/C, CINCH connector, cable 2 meters

Temperature range: -30 to 80°C
code SN200C
Temperature probe Pt1000TR160/C, CINCH connector, cable 5 meters

Temperature probe Pt1000TR160/C, CINCH connector, cable 5 meters

Temperature range: -30 to 80°C
code SN201C
Temperature probe Pt1000TR160/C, CINCH connector, cable 10 meters

Temperature probe Pt1000TR160/C, CINCH connector, cable 10 meters

Temperature range: -30 to 80°C
code SN202C
Temperature probe Pt1000TR160/C, CINCH connector, cable 15 meters

Temperature probe Pt1000TR160/C, CINCH connector, cable 15 meters

Temperature range: -30 to 80°C
code SN203C
Temperature probe Pt1000TR160/C, CINCH connector, cable 20 meters

Temperature probe Pt1000TR160/C, CINCH connector, cable 20 meters

Temperature range: -30 to 80°C
code SN204C
Stick-in probe 2091-250/C, CINCH connector, cable 1 meter

Stick-in probe 2091-250/C, CINCH connector, cable 1 meter

Temperature range: -50 to 250°C
code SN210C
Stick-in probe 2091-250/C, CINCH connector, cable 2 meters

Stick-in probe 2091-250/C, CINCH connector, cable 2 meters

Temperature range: -50 to 250°C
code SN211C
Stick-in probe 2091-250/C, CINCH connector, cable 5 meters

Stick-in probe 2091-250/C, CINCH connector, cable 5 meters

Temperature range: -50 to 250°C
code SN212C
Stick-in probe 2091-250/C, CINCH connector, cable 10 meters

Stick-in probe 2091-250/C, CINCH connector, cable 10 meters

Temperature range: -50 to 250°C
code SN213C
Temperature probe Pt1000TR125/C, CINCH connector, cable 1 meter

Temperature probe Pt1000TR125/C, CINCH connector, cable 1 meter

Temperature range: -190 to 150°C
code SN239C
Temperature probe Pt1000TR125/C, CINCH connector, cable 2 meters

Temperature probe Pt1000TR125/C, CINCH connector, cable 2 meters

Temperature range: -190 to 150°C
code SN240C
Temperature probe Pt1000TR125/C, CINCH connector, cable 5 meters

Temperature probe Pt1000TR125/C, CINCH connector, cable 5 meters

Temperature range: -190 to 150°C
code SN241C
Temperature probe Pt1000TR125/C, CINCH connector, cable 10 meters

Temperature probe Pt1000TR125/C, CINCH connector, cable 10 meters

Temperature range: -190 to 150°C
code SN242C
Temperature probe Pt1000TR050S/C, CINCH connector, cable 1 meter

Temperature probe Pt1000TR050S/C, CINCH connector, cable 1 meter

Temperature range: -50 to 400°C
Discontinued
Ultra thin temperature probe Pt1000TG3/C, CINCH connector

Ultra thin temperature probe Pt1000TG3/C, CINCH connector

Temperature range: -50 to 200°C
code SN252C
Temperature probe Pt1000TR050S/C, CINCH connector, cable 10 meters

Temperature probe Pt1000TR050S/C, CINCH connector, cable 10 meters

Temperature range: -50 to 400°C
Discontinued
Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II

Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II

Temperature range: -30 to 180°C
code SN263C
Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II, cable 2 meters

Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II, cable 2 meters

Temperature range: -30 to 180°C
code SN264C
Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II, cable 5 meters

Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II, cable 5 meters

Temperature range: -30 to 180°C
code SN265C
Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II, cable 10 meters

Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II, cable 10 meters

Temperature range: -30 to 180°C
code SN266C
Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II, cable 15 meters

Temperature probe Pt1000TG8Ex/C, CINCH connector, for ATEX zone II, cable 15 meters

Temperature range: -30 to 180°C
code SN267C
Temperature probe Pt1000TR050M/C, CINCH connector, cable 1 meter

Temperature probe Pt1000TR050M/C, CINCH connector, cable 1 meter

Temperature range: -50 to 400°C
code SN270C
Temperature probe Pt1000TR050M/C, CINCH connector, cable 2 meters

Temperature probe Pt1000TR050M/C, CINCH connector, cable 2 meters

Temperature range: -50 to 400°C
code SN271C
Temperature probe Pt1000TR050M/C, CINCH connector, cable 5 meters

Temperature probe Pt1000TR050M/C, CINCH connector, cable 5 meters

Temperature range: -50 to 400°C
code SN272C
Temperature probe Pt1000TR050M/C, CINCH connector, cable 10 meters

Temperature probe Pt1000TR050M/C, CINCH connector, cable 10 meters

Temperature range: -50 to 400°C
code SN273C

Ultra thin digital temperature/humidity probe

Ultra thin digital temperature/humidity probe

Temperature range: -10 to 60°C
code DIGIH/E-1
Ultra thin digital temperature/humidity probe, cable 2 m

Ultra thin digital temperature/humidity probe, cable 2 m

Temperature range: -10 to 60°C
code DIGIH/E-2
Ultra thin digital temperature/humidity probe, cable 5 m

Ultra thin digital temperature/humidity probe, cable 5 m

Temperature range: -10 to 60°C
code DIGIH/E-5
Digital temperature/humidity probe DIGIL/E, ELKA connector

Digital temperature/humidity probe DIGIL/E, ELKA connector

Temperature range: -20 to 80°C
code DIGIL/E
Digital temperature/humidity probe DIGIL/E-1, ELKA connector, cable 1 meter

Digital temperature/humidity probe DIGIL/E-1, ELKA connector, cable 1 meter

Temperature range: -30 to 105°C
code DIGIL/E-1
Digital temperature/humidity probe DIGIL/E-10, ELKA connector, cable 10 meters

Digital temperature/humidity probe DIGIL/E-10, ELKA connector, cable 10 meters

Temperature range: -30 to 105°C
code DIGIL/E-10
Digital temperature/humidity probe DIGIL/E-15, ELKA connector, cable 15 meters

Digital temperature/humidity probe DIGIL/E-15, ELKA connector, cable 15 meters

Temperature range: -30 to 105°C
code DIGIL/E-15
Digital temperature/humidity probe DIGIL/E-2, ELKA connector, cable 2 meters

Digital temperature/humidity probe DIGIL/E-2, ELKA connector, cable 2 meters

Temperature range: -30 to 105°C
code DIGIL/E-2
Digital temperature/humidity probe DIGIL/E-5, ELKA connector, cable 5 meters

Digital temperature/humidity probe DIGIL/E-5, ELKA connector, cable 5 meters

Temperature range: -30 to 105°C
code DIGIL/E-5
Digital temperature/humidity probe DIGIS/E, ELKA connector

Digital temperature/humidity probe DIGIS/E, ELKA connector

Temperature range: -20 to 80°C
code DIGIS/E
Digital temperature/humidity probe DIGIS/E-1, ELKA connector, cable 1 meter

Digital temperature/humidity probe DIGIS/E-1, ELKA connector, cable 1 meter

Temperature range: -10 to 60°C
code DIGIS/E-1
Digital temperature/humidity probe DIGIS/E-10, ELKA connector, cable 10 meters

Digital temperature/humidity probe DIGIS/E-10, ELKA connector, cable 10 meters

Temperature range: -10 to 60°C
code DIGIS/E-10
Digital temperature/humidity probe DIGIS/E-15, ELKA connector, cable 15 meters

Digital temperature/humidity probe DIGIS/E-15, ELKA connector, cable 15 meters

Temperature range: -10 to 60°C
code DIGIS/E-15
Digital temperature/humidity probe DIGIS/E-2, ELKA connector, cable 2 meters

Digital temperature/humidity probe DIGIS/E-2, ELKA connector, cable 2 meters

Temperature range: -10 to 60°C
code DIGIS/E-2
Digital temperature/humidity probe DIGIS/E-5, ELKA connector, cable 5 meters

Digital temperature/humidity probe DIGIS/E-5, ELKA connector, cable 5 meters

Temperature range: -10 to 60°C
code DIGIS/E-5

AC/DC adapter 230Vac to 5Vdc/2.1 A, EU

AC/DC adapter 230Vac to 5Vdc/2.1 A, EU

code A1879eu
AC/DC adapter 230Vac to 5Vdc/2.1 A, UK

AC/DC adapter 230Vac to 5Vdc/2.1 A, UK

code A1879uk
AC/DC adapter 230Vac to 5Vdc/2.1 A, US

AC/DC adapter 230Vac to 5Vdc/2.1 A, US

code A1879us

Accredited temperature calibration

Accredited temperature calibration

code SLU001
Accredited temperature and relative humidity calibration

Accredited temperature and relative humidity calibration

code SLU003

KIT-GSM with modem

KIT-GSM with modem

code KIT-GSM-W
300Mbps Wireless N Nano Router

300Mbps Wireless N Nano Router

code TL-WIFI

Magnetic holder for Web Sensors PAxxxx and TAxxxx

Magnetic holder for Web Sensors PAxxxx and TAxxxx

code SP104

sintered bronze sensor protection

sintered bronze sensor protection

code F0000
plastic sensor protection with stainless filter (gray)

plastic sensor protection with stainless filter (gray)

code F5200
plastic sensor protection with stainless filter (black)

plastic sensor protection with stainless filter (black)

code F5200B
PTFE sensor protection, white

PTFE sensor protection, white

code F5300

COMET Database

COMET Database

code CDB
COMET Cloud

COMET Cloud

code cloud
COMET Cloud Lite for Android & iOS

COMET Cloud Lite for Android & iOS

code cloud_app
COMET VISION - Analytical Software for Dataloggers and Multiloggers

COMET VISION - Analytical Software for Dataloggers and Multiloggers

code CV
Database Viewer for Comet Database

Database Viewer for Comet Database

code DBV

COMET presentation case for samples

COMET presentation case for samples

code BM512
COMET Magnetic Foldable Stand

COMET Magnetic Foldable Stand

code PPO001

Software

download-icon Comet Database One Click Installer (21.1-V)
487.31 MB
download-icon Database Viewer 3.20.0.0 dbapi 21.1
24.33 MB
download-icon Conversions - application for recalculation of values
694.50 KB
download-icon COMET Cloud Lite - Android (Google Play)
download-icon COMET Cloud Lite - iOS (App Store)

Others

download-icon Terms and Conditions COMET System s.r.o.
133.12 KB

Manuals

download-icon Quick Start Manual
961.10 KB

Catalogs

download-icon CATALOG - WebSensor with Ethernet output
4.06 MB
download-icon Catalogue Sheets - COMET Premium WebSensors 2.0
107.88 KB

Related products

COMET Cloud

COMET Cloud

code cloud
COMET Database

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code CDB
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Discontinued
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code W3710
WiFi temperature and relative humidity sensor for external probe

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code W3711
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code W3811
IoT Wireless Temperature and Relative Humidity Datalogger for external probe, with built-in 4G modem

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code U3121G
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Web Sensor with PoE - remote thermometer hygrometer with Ethernet interface

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code T3610
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code T3611

We produce

Leading manufacturer of temperature, humidity, atmospheric pressure, carbon dioxide CO2 transmitters, data loggers, monitoring systems, data acquisiton systems, thermometers, hygrometers, barometers. Production includes data acquisition systems, humidity, temperature, CO2 transmitters and portable thermometers, hygrometers, barometers, CO2 meters. Instruments are designed for accurate measurement and for monitoring environmental conditions.

All instruments come with included traceable calibration certificate with declared metrological traceability of etalons based on requirements of EN ISO/IEC 17025 standard.

 

 

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