WIKA T24 - Handbuch (Seite 24)

GB
24 WIKA operating instructions temperature transmitter, model T24
2370242.09 08/2013 GB/D
T24.xx.x09 (use as energy-limited equipment II 3G Ex nL):
The supply current circuit must fulfil the conditions of energy-limited
ignition protection type II 3G Ex nL per EN 60079-15. The temperature
transmitter must be mounted in an enclosure that meets a minimum
ingress protection of IP 54 per EN 60529/IEC 60529.
T24.xx.009 (use as non-incendive equipment II 3G Ex nA):
Disconnection of the power supply within the hazardous area is
forbidden. When connection or disconnecting the terminals ensure the
power supply is disconnected outside the hazardous area.
The temperature transmitter must be mounted in an enclosure
that meets a minimum ingress protection of IP 54 per EN 60529/
IEC 60529.
When, during use in circuits with the safety class nA (non-incendive),
the permissible connected loads have been exceeded for a short
time 1) , the use of these temperature transmitters in circuits with the
safety class Ex nL (energy-limited) is no longer permissible.
1) When the transmitters are used in circuits with the protection class nA, it is
permissible to briefly exceed the maximum supply voltage by up to 40 %.
Operation in zone 0:
The temperature transmitter may only be operated in areas requiring
Category 1 equipment when the following atmospheric conditions
exist:
Temperature: -20 ... +60 °C
Pressure: 0.8 ... 1.1 bar
8. Information on mounting and operation ...