WIKA TR10-A - Handbuch (Seite 26)

14094976.00
3345267.12 01/2014 GB/D
26 WIKA operating instructions RTD and TC, intrinsically safe designs (Ex i)
GB
The values in brackets apply to special designs. These sensors are manufactured using special
sealing compounds. Moreover, they are equipped with connection heads made of stainless steel
and cable glands for the low-temperature range.
These thermometers are suitable for temperature classes T6 ... T3 in accordance with the
approval certificate. This applies to instruments without built-in transmitters and/or digital
displays. Thermometers equipped with transmitters and/or digital displays are for use in
temperature classes T6 ... T4 and are marked accordingly. Using equipment for applications
which require a lower temperature class (e.g. T2) than the marked one is permissible. In doing so,
it must be ensured that the maximum ambient temperature for safe operation of the instrument is
not exceeded.
7.3 Temperature carry-over from the process
A heat backflow from the process that exceeds the operating temperature of the transmitter
(digital display) or housing is not permissible and must be prevented by installing suitable heat
insulation or a neck tube of suitable length.
7.3.1 Overview of the temperature zones
7. Information on mounting, operation in hazardous area (Europe)
Tx10 Tx10 Tx40 Tx40
Option: with built-in
transmitter e.g. T32
Option:
with connector
MI line
Option:
with connector
cable
Tx10-A Tx10-A
T3 T3 T3 T3
Pr
ocess connection
Pr
ocess connection
Pr
ocess connection
Pr
ocess connection
1)
permissible temperatures at
T1: (-50) -40 °C < Ta < +300 °C
T3: (-50) -40 °C < Ta < +150 °C
T4: (-50) -40 °C < Ta < +100 °C
T4 T4
Transmitter T4
connector
T4
connector
T1 T1 T1 T1
T4 Transmitter : (-50) -40 °C < Ta < +85 °C
T4 connector : (-50) -40 °C < Ta < +85 °C
1) Temperature zone undefined
1) 1) 1)