WIKA T24.10 Betriebsanleitung Seite 11

6. Notes for mounting and operating in hazardous areas
T24.10.**2 for category II 1G/IIC in addition: The surface of the
case is not conductive. The temperature transmitter must be
mounted in a way that electrostatic charges will not occur. This is
ensured e.g. by mounting the transmitter into an electrically
conductive connection head.
T24.10.**9 (Use as energy-limited equipment II 3G EEx nL):
The supply current circuit must fulfil the requirements for ignition
protection type II 3G EEx nL energy-limited (EN 50 021). These
transmitters must be mounted in a case that must at least
correspond to following ingress protection IP 54 according to
EN 60 529 / IEC 529.
T24.10.**9 (Use as non-incendive equipment II 3G EEx nA):
Disconnection of power supply is forbidden inside the hazardous
area. When connecting or disconnecting the terminals ensure the
power supply is disconnected outside the hazardous area. These trans-
mitters must be mounted in a case that must at least correspond to
ingress protection IP 54 according to EN 60 529 / IEC 529.
When during use in circuits with the safety class nA (non-incendive)
the permissible connected loads have been exceeded for a short
term , the use of these transmitters in circuits with the safety class
1)
EEx nL (energy-limited) is not permissible any more.
1) When the transmitters are used in circuits with the safety class nA, it is
permissible to exceed the maximum supply voltage by up to 40 % for a
short term.
Operation in Zone 0: The temperature transmitter may only be
operated in areas that require apparatus of category 1 when
following atmospheric conditions exist:
Temperature: -20 °C ... +60 °C Pressure: 0.8 bar ... 1.1 bar
Operation in Zone 1 und Zone 2:
According to the temperature class, these transmitters may be used
only in the following ambient temperature ranges.
WIKA Operating instructions temperature transmitter Model T24.10
GB
11