EL3314

Product information

Product Overview

The EL3314 connects four thermocouples directly. A microprocessor linearises the characteristic across the whole temperature range, so the controller receives a temperature rather than a raw microvolt signal. Resolution is 16 bit and the representation is adjustable.

It is the terminal for high-temperature measurement — furnaces, ovens, extruders, exhaust and process heat — where an RTD cannot survive.

Why Buyers Specify This Model

Thermocouple types covered, and the default

Beckhoff lists type B, C, E, J, K, L, N, R, S, T and U, with type K as the default. Type K is the general-purpose industrial thermocouple; types R, S and B are the noble-metal types for very high temperatures, and types J, T and E cover lower ranges.

Because linearisation is handled in the terminal, you do not have to implement a polynomial for the thermocouple type in the PLC program. Change the configured type and the terminal follows.

Cold junction compensation — internal or external

A thermocouple measures a temperature difference, so the terminal has to know the temperature at its own terminals. The EL3314 provides internal cold junction compensation and also accepts an external cold junction.

Beckhoff publishes the measurement uncertainty at 23 °C ambient with internal cold junction, broken down by thermocouple type — for example type K is significantly better than type B or C. Where accuracy matters, read the figure for your specific type rather than assuming a single number for the module.

Wire break detection and the voltage mode

The terminal provides channel-by-channel wire break detection and adjustable firmware filters. Wire break detection is not a nicety on a thermocouple: the signal is a few tens of millivolts, so a broken or corroded junction presents as a plausible-looking temperature rather than an obvious fault.

The EL3314 can also be used as a voltage input measuring ±30 / ±60 / ±75 mV, with a measurement uncertainty below ±0.14% of full scale at ±75 mV. Resolution is 16 bit with the representation adjustable to 0.1 °C, 0.01 °C or 1 / 2 / 4 µV per digit.

Technical Specifications (Official Beckhoff Data)

Parameter	Official value
Number of inputs	4
Power supply	via the E-bus
Distributed clocks	–
Input filter cut-off frequency	typ. 1 kHz
Connection technology	2-wire
Conversion time	approx. 2.5 s up to 10 ms, depending on configuration and filter setting, default: approx. 250 ms
Voltage measurement	±30/±60/±75 mV
Resolution	16 bit, representation adjustable: 0.1/0.01°C or 1/2/4 µV per digit
Temperature measurement (thermocouple)	type B, C, E, J, K, L, N, R, S, T, U (default setting: type K)
Measurement uncertainty (temperature measurement)	at 23°C ambient temperature, with internal cold junction, according type: / B: ±8.5°C; C: ±6.2°C; E: ±2.5°C; J: ±2.7°C; K: ±3°C; L: ±2.3°C; N: ±3°C; R: ±6.7°C; S: ±7.1°C; T: ±2.9°C; U: ±2.5°C; / for further details see documentation
Measurement uncertainty (voltage measurement)	at ±75 mV, 23°C ambient temperature: < ±0.14% (relative to full scale value)
Electrical isolation	500 V (E-bus/signal voltage)
Current consumption E-bus	typ. 200 mA
Current consumption power contacts	–
Special features	channel by channel wire break detection, internal and external cold junction, firmware filter adjustable
Weight	approx. 60 g
Operating temperature	-25…+60°C
Storage temperature	-40…+85°C
Relative humidity	95%, no condensation
Vibration/shock resistance	conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission	conforms to EN 61000-6-2/EN 61000-6-4
Protect. rating/installation pos.	IP20/variable
Approvals/markings	CE, CCC, UL, ATEX, IECEx, cFMus
Ex marking	ATEX: / II 3G Ex ec IIC T4 Gc / IECEx: / Ex ec IIC T4 Gc / cFMus: / Class I, Division 2, Groups A, B, C, D / Class I, Zone 2, AEx ec IIC T4 Gc

Specifications are Beckhoff’s official product data for the EL3314. The ES3314 variant is identical but with a pluggable wiring level.

Housing, Installation and Wiring

Data	Official value
Design form	compact terminal housing with signal LEDs
Material	polycarbonate
Installation	on 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means of	double slot and key connection
Marking	labeling of the BZxxxx series
Wiring	solid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver
Connection cross-section	s*: 0.08…2.5 mm², / st*: 0.08…2.5 mm², / f*: 0.14…1.5 mm²
Connection cross-section AWG	s*: AWG28…14, / st*: AWG28…14, / f*: AWG26…16
Stripping length	8…9 mm
Current load power contacts	I max : 10 A
Dimensions (W x H x D)	12 mm x 100 mm x 68 mm

Material Compliance

The following is Beckhoff’s published material compliance data for this product, reproduced unchanged. Beckhoff notes that absence of a substance is not verified by analytical tests.

Item	Official statement
REACH SVHC	no
POP	compliant
RoHS	compliant with exemption
RoHS exemption	7c-I: Lead-containing electrical and electronic components in glass and ceramic materials, excluding dielectric ceramics in capacitors
China-RoHS	www.beckhoff.com/china-rohs-io
CA Prop65	www.beckhoff.com/prop65

Official Documentation

Every figure in the table above is published by Beckhoff. We reproduce it rather than paraphrase it, so that you can check it against the manufacturer’s own documentation:

• Beckhoff official product page — EL3314 — the source of every specification on this page.
• Beckhoff official documentation for EL3314 — downloadable PDF from Beckhoff’s documentation server.
• Canonical Beckhoff documentation link for EL3314.

Ordering This Part

Tell us the model and, where an order code exists, the complete code — Beckhoff variants differ in ways that matter, as set out above. For discontinued models, a nameplate photograph is the fastest way to confirm exactly what you have.

• Exact model or order code (including any suffix such as -0111 or -ES variants)
• Quantity required
• Whether you need the terminal alone or a complete station with coupler and power supply
• For replacements: a photo of the existing nameplate or the old order code

We confirm availability and condition before quoting. We do not publish stock levels or lead times on this page because they change; ask and we will answer specifically for your requirement.

Frequently Asked Questions

Which thermocouple types does the EL3314 support?

Type B, C, E, J, K, L, N, R, S, T and U, with type K as the factory default. Linearisation is performed in the terminal.

How accurate is it, really?

Beckhoff publishes the measurement uncertainty at 23 °C ambient with internal cold junction, separately for each thermocouple type. The figure differs substantially between types — the noble-metal types are inherently less accurate than type K. Ask us for the number for your specific type before selecting.

Do I need an external cold junction?

Not necessarily. The EL3314 has internal cold junction compensation and also accepts an external cold junction. An external reference is used where the terminal’s own ambient is not representative of the measurement environment.

What is the resolution and the conversion time?

Resolution is 16 bit, represented as 0.1 °C, 0.01 °C or 1 / 2 / 4 µV per digit. Conversion time ranges from approximately 2.5 s down to 10 ms depending on configuration and filter setting, with approximately 250 ms as the default.

Can it detect a broken thermocouple?

Yes. Beckhoff specifies channel-by-channel wire break detection, plus internal and external cold junction and adjustable firmware filters.