Beckhoff KL3302, Documentation

Page: 11 / 51

Product overview
KL3311, KL3312, KL3314 and KL3302 11 Version: 4.2
2.2 Technical Data
Technical data KL3311 KL3302* KL3312 KL3314
Number of inputs 1 2 4
Power supply for the electronics via the K-bus
Thermocouple sensor type Types B, E, J, K, L, N, R, S, T, U, mV measurement (default setting is type K)
Connection technology 2-wire
Temperature range In each case within the defined range of the sensor
(preset: type K, -100 °C to 1370 °C)
Resolution 0.1 ℃ per digit
Open-circuit recognition yes no yes yes
Conversion time ~ 200 ms ~ 250 ms
Measuring error (total measuring
range) < ±0.5 % of the full scale value
Electrical isolation 500 V (K-bus / signal voltage)
Current consumption K-bus typically 65 mA
Bit width in the K-bus I/O Input: 1 x 16 bits of
data (1 x 8 bits con-
trol/status optional) Input: 2 x 16 bits of data (2 x 8 bits control/sta-
tus optional) Input: 4 x 16 bits of
data (4 x 8 bits con-
trol/status optional)
Configuration No address or configuration settings
Weight approx. 70 g
Dimensions (W x H x D) approx. 15 mm x 100 mm x 70 mm (width aligned: 12 mm)
Mounting [
}
15]
on 35 mm mounting rail according to EN 60715
Permissible ambient temperature range
during operation 0 °C ... + 55 °C
Permissible ambient temperature range
during storage -25 °C ... + 85 °C
Permissible relative air humidity 95 %, no condensation
Vibration / shock resistance
conforms to EN 60068-2-6 / EN 60068-2-27, see also Installation instructions for enhanced
mechanical load capacity [ } 19]
EMC immunity / emission conforms to EN 61000-6-2 / EN 61000-6-4
Protection class IP20
Installation position variable
Approval
CE, cULus, ATEX
[ } 28]
-
CE, cULus, ATEX
[ } 28]
CE, cULus, ATEX
[ } 28] ,GL
*) 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 [
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12] .)