Technical Data; Basic Function Principles - Beckhoff KL3311 Documentation

2.2

Technical Data

Technical data
Number of inputs
Power supply for the electronics
Thermocouple sensor type
Connection technology
Temperature range
Resolution
Open-circuit recognition
Conversion time
Measuring error (total measuring
range)
Electrical isolation
Current consumption K-bus
Bit width in the K-bus I/O
Configuration
Weight
Dimensions (W x H x D)
Mounting [} 15]
Permissible ambient temperature range
during operation
Permissible ambient temperature range
during storage
Permissible relative air humidity
Vibration / shock resistance
EMC immunity / emission
Protection class
Installation position
Approval
*) KL3302 is no longer available and was replaced with KL3312.
2.3

Basic function principles

The thermocouple terminals can evaluate thermocouples of the types B, E, J, K, L, N, R, S, T and U. The
characteristic curves are linearized and the reference temperature determined directly within the terminal.
Temperatures are output in 1/10°C, for example (device-dependent). The terminal is fully configurable via
the Bus Coupler or the control system. Different output formats may be selected or own scaling activated. In
addition, linearization of the characteristic curve and determination and calculation of the reference
temperature (temperature at the terminal connection contacts) can be switched off.
Measuring principle of the thermocouple
Thermocouples can be classified as active transducers. They exploit the thermo-electric effect (Seebeck,
Peltier, Thomson). A voltage referred to as thermovoltage occurs over the length of a cable with different
temperatures at both ends. It is an unambiguous function of the temperature and the material. In a "TC
element" this effect is utilized by operating two different conductor materials in parallel (s. fig [} 12].)
KL3311, KL3312, KL3314 and KL3302
KL3311 KL3302*
1 2
via the K-bus
Types B, E, J, K, L, N, R, S, T, U, mV measurement (default setting is type K)
2-wire
In each case within the defined range of the sensor
(preset: type K, -100 °C to 1370 °C)
0.1 ℃ per digit
yes no
~ 200 ms ~ 250 ms
< ±0.5 % of the full scale value
500 V (K-bus / signal voltage)
typically 65 mA
Input: 1 x 16 bits of Input: 2 x 16 bits of data (2 x 8 bits control/sta-
data (1 x 8 bits con- tus optional)
trol/status optional)
No address or configuration settings
approx. 70 g
approx. 15 mm x 100 mm x 70 mm (width aligned: 12 mm)
on 35 mm mounting rail according to EN 60715
0 °C ... + 55 °C
-25 °C ... + 85 °C
95 %, no condensation
conforms to EN 60068-2-6 / EN 60068-2-27, see also Installation instructions for enhanced
mechanical load capacity [} 19]
conforms to EN 61000-6-2 / EN 61000-6-4
IP20
variable
-
CE, cULus, ATEX
[} 28]
Version: 4.2
Product overview
KL3312 KL3314
4
yes yes
Input: 4 x 16 bits of
data (4 x 8 bits con-
trol/status optional)
CE, cULus, ATEX CE, cULus, ATEX
[} 28] [} 28],GL
11