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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
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
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
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
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
  • On request
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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% RH

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 1 s
Ingress protection (IP rating) IP30 (electronics)
Dimensions 116 × 85 × 42 mm (without connected probe)
Weight 220 g
Warranty 3 years

Optional accessories and download

Pt1000TG8/C, temperature probe

Pt1000TG8/C, temperature probe

Temperature range: -80 to 200°C
code SN104C
Price $75
Large quantities in stock
Pt1000TG8/C, temperature probe, cable 2 m

Pt1000TG8/C, temperature probe, cable 2 m

Temperature range: -80 to 200°C
code SN105C
Price $79
Large quantities in stock
Pt1000TG8/C, temperature probe, cable 5 m

Pt1000TG8/C, temperature probe, cable 5 m

Temperature range: -80 to 200°C
code SN108C
Price $95
Large quantities in stock
Pt1000TG8/C, temperature probe, cable 10 m

Pt1000TG8/C, temperature probe, cable 10 m

Temperature range: -80 to 200°C
code SN113C
Price $125
Large quantities in stock
Pt1000TG7/C, temperature probe

Pt1000TG7/C, temperature probe

Temperature range: -50 to 200°C
code SN164C
Price $103
In stock
Pt1000TG7/C, temperature probe, cable 2 m

Pt1000TG7/C, temperature probe, cable 2 m

Temperature range: -50 to 200°C
code SN165C
Price $110
In stock
Pt1000TG7/C, temperature probe, cable 5 m

Pt1000TG7/C, temperature probe, cable 5 m

Temperature range: -50 to 200°C
code SN166C
Price $121
In stock
Pt1000TG7/C, temperature probe, cable 10 m

Pt1000TG7/C, temperature probe, cable 10 m

Temperature range: -50 to 200°C
code SN167C
Price $145
Large quantities in stock
2301-220/C, temperature probe, cable 1 m

2301-220/C, temperature probe, cable 1 m

Temperature range: -30 to 220°C
code SN168C
Price $196
In stock
2021-150/C, temperature probe, cable 1 m

2021-150/C, temperature probe, cable 1 m

Temperature range: -30 to 150°C
code SN169C
Price $308
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PTS350A-2/0, temperature probe, cable 2 m

PTS350A-2/0, temperature probe, cable 2 m

Temperature range: -30 to 130°C
code SN170C
Price $108
In stock
2034-220/C, temperature probe, cable 1 m

2034-220/C, temperature probe, cable 1 m

Temperature range: -30 to 150°C
code SN175C
Price $185
In stock
Ambient temperature probe, 200-80/C

Ambient temperature probe, 200-80/C

Temperature range: -30 to 80°C
code SN177
Price $46
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2061-200/C, temperature probe, cable 1 m

2061-200/C, temperature probe, cable 1 m

Temperature range: -50 to 200°C
code SN178C
Price $224
In stock
2061-200/C, temperature probe, cable 2 m

2061-200/C, temperature probe, cable 2 m

Temperature range: -50 to 200°C
code SN179C
Price $231
In stock
2061-200/C, temperature probe, cable 5 m

2061-200/C, temperature probe, cable 5 m

Temperature range: -50 to 200°C
code SN180C
Price $249
In stock
2061-200/C, temperature probe, cable 10 m

2061-200/C, temperature probe, cable 10 m

Temperature range: -50 to 200°C
code SN181C
Price $279
In stock
PTS350A-5/C, temperature probe, cable 5 m

PTS350A-5/C, temperature probe, cable 5 m

Temperature range: -30 to 130°C
code SN182C
Price $121
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PTS350A-10/C, temperature probe, cable 10 m

PTS350A-10/C, temperature probe, cable 10 m

Temperature range: -30 to 130°C
code SN183C
Price $143
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Pt1000TGL40/C, temperature probe, cable 1 m

Pt1000TGL40/C, temperature probe, cable 1 m

Temperature range: -30 to 80°C
code SN185C
Price $66
In stock
Pt1000TGL40/C, temperature probe, cable 2 m

Pt1000TGL40/C, temperature probe, cable 2 m

Temperature range: -30 to 80°C
code SN186C
Price $70
In stock
Pt1000TGL40/C, temperature probe, cable 5 m

Pt1000TGL40/C, temperature probe, cable 5 m

Temperature range: -30 to 80°C
code SN187C
Price $79
In stock
Pt1000TGL40/C, temperature probe, cable 10 m

Pt1000TGL40/C, temperature probe, cable 10 m

Temperature range: -30 to 80°C
code SN188C
Price $95
In stock
Pt1000TR160/C, temperature probe, cable 1 m

Pt1000TR160/C, temperature probe, cable 1 m

Temperature range: -30 to 80°C
code SN199C
Price $57
In stock
Pt1000TR160/C, temperature probe, cable 2 m

Pt1000TR160/C, temperature probe, cable 2 m

Temperature range: -30 to 80°C
code SN200C
Price $59
In stock
Pt1000TR160/C, temperature probe, cable 5 m

Pt1000TR160/C, temperature probe, cable 5 m

Temperature range: -30 to 80°C
code SN201C
Price $66
Large quantities in stock
Pt1000TR160/C, temperature probe, cable 10 m

Pt1000TR160/C, temperature probe, cable 10 m

Temperature range: -30 to 80°C
code SN202C
Price $79
Large quantities in stock
Pt1000TR160/C, temperature probe, cable 15 m

Pt1000TR160/C, temperature probe, cable 15 m

Temperature range: -30 to 80°C
code SN203C
Price $101
Large quantities in stock
Pt1000TR160/C, temperature probe, cable 20 m

Pt1000TR160/C, temperature probe, cable 20 m

Temperature range: -30 to 80°C
code SN204C
Price $112
In stock
2091-250/C, Stick-in probe, cable 1 m

2091-250/C, Stick-in probe, cable 1 m

Temperature range: -50 to 250°C
code SN210C
Price $242
Limited stock
2091-250/C, Stick-in probe, cable 2 m

2091-250/C, Stick-in probe, cable 2 m

Temperature range: -50 to 250°C
code SN211C
Price $260
Limited stock
2091-250/C, Stick-in probe, cable 5 m

2091-250/C, Stick-in probe, cable 5 m

Temperature range: -50 to 250°C
code SN212C
Price $312
Limited stock
2091-250/C, Stick-in probe, cable 10 m

2091-250/C, Stick-in probe, cable 10 m

Temperature range: -50 to 250°C
code SN213C
Price $403
Usually available within one week
Pt1000TR125/C, temperature probe, cable 1 m

Pt1000TR125/C, temperature probe, cable 1 m

Temperature range: -190 to 150°C
code SN239C
Price $218
In stock
Pt1000TR125/C, temperature probe, cable 2 m

Pt1000TR125/C, temperature probe, cable 2 m

Temperature range: -190 to 150°C
code SN240C
Price $238
In stock
Pt1000TR125/C, temperature probe, cable 5 m

Pt1000TR125/C, temperature probe, cable 5 m

Temperature range: -190 to 150°C
code SN241C
Price $304
In stock
Pt1000TR125/C, temperature probe, cable 10 m

Pt1000TR125/C, temperature probe, cable 10 m

Temperature range: -190 to 150°C
code SN242C
Price $411
Limited stock
Pt1000TR050S/C, temperature probe, cable 1 m

Pt1000TR050S/C, temperature probe, cable 1 m

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
Price $88
Large quantities in stock
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
Price $130
Usually available within one week
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
Price $132
Usually available within one week
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
Price $150
Usually available within one week
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
Price $178
Usually available within one week
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
Price $227
Usually available within one week
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
Price $163
Limited stock
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
Price $185
Limited stock
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
Price $249
In stock
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
Price $352
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Ultra thin digital temperature/humidity probe

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Temperature range: -10 to 60°C
code DIGIH/E-1
Price $233
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Ultra thin digital temperature/humidity probe, cable 2 m

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Temperature range: -10 to 60°C
code DIGIH/E-2
Price $246
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Temperature range: -10 to 60°C
code DIGIH/E-5
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Temperature range: -20 to 80°C
code DIGIL/E
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Temperature range: -30 to 105°C
code DIGIL/E-1
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Temperature range: -30 to 105°C
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code DIGIS/E
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Temperature range: -10 to 60°C
code DIGIS/E-1
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code DIGIS/E-10
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code DIGIS/E-15
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code DIGIS/E-2
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sintered bronze sensor cover

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code CDB
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code DBV
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Software

download-icon Comet Database One Click Installer (22.1-II)
521.60 MB
download-icon Database Viewer 3.23.0.0 dbapi 22.1
24.49 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 Instruction Manual
2.72 MB
download-icon Quick Start Manual
578.69 KB
download-icon Declaration of Conformity
140.71 KB
download-icon Certificate of Volatility
133.86 KB
download-icon MIB
587.33 KB

Firmware and SDK

download-icon Firmware version 11-0-1-0 (2026-05-27)
1.45 MB
download-icon Software development kit (SDK)
35.08 KB

Catalogs

download-icon Catalogue Sheets - COMET Premium WebSensors 2.0
1.03 MB

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Contact

COMET AMERICA
11045 Alameda Ave
Inver Grove Heights, MN 55077
USA

E-mail: info@comet-america.com

Telephone customer support
Phone: (612)-845-6990

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.