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3708E

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Triconex 3708E is a 16-point isolated TMR thermocouple input module for J, K, T and E sensors with 50 ms updates and cold-junction diagnostics.
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Technical specifications for 3708E

  • Manufacturer:
    Invensys
  • Part Number:
    3708E
  • Product Family:
    Triconex
  • Product Type:
    Isolated TMR Thermocouple Input Module
  • Stock:
    1
  • Architecture:
    TMR thermocouple input
  • Input signals:
    16 differential, isolated
  • Thermocouple types:
    J, K, T, E
  • Input update rate:
    50 ms
  • Input resistance:
    30 MΩ minimum
  • Common-mode rejection:
    -90 dB at 0–60 Hz minimum; -100 dB at DC minimum
  • Common-mode range:
    ±200 VDC maximum
  • Leg-to-leg isolation:
    20 kΩ typical
  • Input point protection:
    110 VAC continuous
  • Reference-junction compensation:
    0°C to 60°C
  • Indicators:
    Pass, Fault, Active, CJ Fault
  • Color code:
    Deep yellow
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Applications Temperature Range Configuration Diagnostics & Protection

Features:

  • Reads sixteen differential thermocouple points with channel isolation.
  • Supports J, K, T and E thermocouple types selected in TriStation 1131.
  • Adds a dedicated cold-junction fault indicator to the standard module diagnostics.
This isolated thermocouple module is the sixteen-point option that includes support for type E in addition to J, K and T.

Each TMR input path performs linearization and cold-junction compensation before sending temperature data to the processors.

Successful selection depends on one common sensor type, correct polarity, appropriate burnout direction and a thermally uniform ETP.

Availability is subject to Apter Power inventory and sourcing confirmation.
Verified resources for Triconex 3708E:Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Monitors furnace, reactor and combustion temperatures using supported thermocouple types.
  • Provides isolated temperature acquisition for safety trips and permissive logic.
  • Detects cold-junction transducer problems through the dedicated front-panel indication.
  • Reference-junction compensation is specified for a 0°C to 60°C operating interval.
  • J, K, T and E thermocouple types provide the documented sensor choices for measured temperature.
  • Usable measurement limits follow the selected thermocouple type and its configured linearization.
  • All sixteen channels are configured for one thermocouple type rather than mixed sensor types.
  • Burnout direction is selected in TriStation 1131 to match the required failure response.
  • Channel assignments and signed temperature scaling must correspond to the connected field sensors.
  • A dedicated CJ Fault indication identifies a failed cold-junction transducer.
  • Pass, Fault and Active indicators report the operating state of the module and acquisition paths.
  • Each input point is protected for continuous exposure up to the documented 110 VAC level.
Description
Triconex 3708E is an isolated TMR thermocouple input module for sixteen differential temperature channels. It linearizes the selected sensor characteristic and applies cold-junction compensation before reporting signed temperature values to the controller. The conversion process delivers engineering values suitable for triplicated control and protective logic without requiring separate external linearization for each connected temperature point.

The module supports J, K, T and E thermocouples for temperature measurement in safety and critical-process applications. All channels use one configured thermocouple type, giving the installation a consistent sensor basis across the module. Typical duties include monitoring bearings, equipment surfaces and process temperatures where sensor-type consistency across the input group is part of the documented design.

Cold-junction and acquisition diagnostics help reveal faults that could distort measured temperature. Reliable service depends on correct sensor metallurgy, extension-wire polarity and a termination-panel environment suitable for accurate reference-junction compensation. Preserving those details reduces offset and polarity errors that might otherwise appear valid at the controller while misrepresenting the actual process temperature.
Alternative Names
3708E Triconex 3708E 3708E Isolated TMR Thermocouple Input Module Triconex 3708E Isolated TMR Thermocouple Input Module 3708E Tricon v9–v11 Thermocouple Input Modules Triconex 3708E Tricon v9–v11 Thermocouple Input Modules Triconex 3708E Tricon v9–v11 Thermocouple Input Modules Isolated TMR Thermocouple Input Module
Technical notes
3708E requires uniform temperature across the thermocouple termination module; gradients at the cold-junction sensors can reduce stated measurement accuracy.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How can the analog-input range of 3708E be confirmed from its order identity?
The model is the isolated sixteen-point thermocouple module supporting J, K, T and E sensor types.
Which termination and chassis rules govern a 3708E installation?
Use the appropriate Tricon chassis position, keyed interface cable and thermocouple ETP with compensation sensors.
What measurement workload is best suited to 3708E?
It supplies fault-tolerant temperature measurements for shutdown, burner, furnace and critical-process logic.
Where can a project obtain verified sourcing terms for 3708E?
Provide condition and timing requirements so Apter Power can check sourcing and technical documentation.
Which signal-engineering records should be preserved when 3708E is exchanged?
Preserve thermocouple type, polarity, burnout direction, isolation, ETP assignment and thermal layout.
What project evidence should be attached to a 3708E price request?
Include the configured sensor type, ETP number, channel list, accuracy requirement, quantity and destination.

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