Product overview
EL33xx-00x0
31
Version: 4.2
thermocouple. Based on the difference to the cold junction temperature, the temperature at the
measurement point can be determined to an accuracy of better than one tenth of a Kelvin with the aid of the
above thermocouple equation.
Sensor circuit
A modification of the sensor circuit with additional devices such as change over switches or multi-
plexer decreases the measure accuracy. We strongly advise against such modifications.
Internal conversion of the thermovoltage and the reference voltage
Since the coefficients are determined at a reference temperature of 0°C, it is necessary to compensate for
the effect of the reference temperature. This is done by converting the reference temperature into a
reference voltage that depends on the type of thermocouple, and adding this to the measured
thermovoltage. The temperature is found from the resulting voltage and the corresponding characteristic
curve.
U
k
= U
m
+ U
r
T
out
= f(U
k
)
Overview of suitable thermocouples
The following thermocouples are suitable for temperature measurement:
Type (according
to EN60584-1)
Element
Implemented temperature
range
Color coding (sheath - plus
pole - minus pole)
B
Pt30%Rh-Pt6Rh
600°C to 1800°C
grey - grey - white
C *
W5%Re-W25%Re
0°C to 2320°C
n.d.
E
NiCr-CuNi
-100°C to 1000°C
violet - violet - white
J
Fe-CuNi
-100°C to 1200°C
black - black - white
K
NiCr-Ni
-200°C to 1370°C
green - green - white
L **
Fe-CuNi
0°C to 900°C
blue - red - blue
N
NiCrSi-NiSi
-100°C to 1300°C
pink - pink - white
R
Pt13%Rh-Pt
0°C to 1767°C
orange - orange - white
S
Pt10%Rh-Pt
0°C to 1760°C
orange - orange - white
T
Cu-CuNi
-200°C to 400°C
brown - brown - white
U **
Cu-CuNi
0°C to 600°C
brown - red - brown
* not standardized according to EN60584-1
** according to DIN 43710
Maximum cable length to the thermocouple
Without additional protective measures, the maximum cable length from the EtherCAT Terminal to
the thermocouple is 30 m. For longer cable lengths, suitable surge protection should be provided.
2.7
Use of EL33xx in the TwinCAT System Manager
In the full configuration (all possible PDOs activated, see PDO assignment), the EL3314, for example, offers
the following process data for use:
Содержание EL33-00 Series
Страница 2: ......
Страница 6: ...Table of contents EL33xx 00x0 6 Version 4 2...
Страница 17: ...Product overview EL33xx 00x0 17 Version 4 2 Fig 10 EL3312 Fig 11 EL3314...
Страница 18: ...Product overview EL33xx 00x0 18 Version 4 2 Fig 12 EL3314 0002 Fig 13 EL3314 0010...
Страница 60: ...Mounting and wiring EL33xx 00x0 60 Version 4 2 4 12 3 EL3314 EL3314 00xx LEDs Fig 43 EL3314 Fig 44 EL3314 0002...
Страница 61: ...Mounting and wiring EL33xx 00x0 61 Version 4 2 Fig 45 EL3314 0010 Fig 46 EL3314 0090...
Страница 66: ...Mounting and wiring EL33xx 00x0 66 Version 4 2 4 13 3 EL3314 00x0 Connection Fig 50 EL3314 Fig 51 EL3314 0002...
Страница 103: ...Commissioning EL33xx 00x0 103 Version 4 2 Fig 100 Incorrect driver settings for the Ethernet port...
Страница 114: ...Commissioning EL33xx 00x0 114 Version 4 2 Fig 119 EtherCAT terminal in the TwinCAT tree left TwinCAT 2 right TwinCAT 3...
