ABB TTH300 Operating Instruction page 12

12 TTH300 HEAD-MOUNT TEMPERATURE TRANSMITTER | OI/TTH300-EN REV. G
... 2 Use in potentially explosive atmospheres in accordance with ATEX and IECEx
... Installation instructions
ATEX – Zone 2
Marking:
II 3 G Ex nA IIC T6...T1 Gc
II 3 G Ex ec IIC T6...T1 Gc
Ex area Zone 2
A Sensor
B Transmitter in housing with IP
rating IP 54
Figure 5: Hookup in ATEX – Zone 2
When using the transmitter in Zone 2, observe the following:
• The temperature transmitter must be installed in its own
housing. This housing must at least meet IP rating IP 54
(in accordance with EN 60529) and other requirements
for potentially explosive atmosphere (e.g. a certified
housing). Suitable cable glands must be used for this
purpose.
• External measures must be made for the power supply
circuit in order to prevent the rated voltage from being
up-scaled by more than 40 % in the event of transient
disturbances.
• The electrical connections must only be opened or closed
when there is no hazardous atmosphere.
• When using the transmitter in Zone 2, make sure that
impermissible electrostatic charging of the temperature
transmitter is prevented (observe the warnings on the
device).
Safe area
C Supply isolator
D Interface for LCD indicator
Commissioning
The commissioning and parameterization of the device may also
be carried out in potentially explosive atmospheres using a
handheld terminal that has been approved accordingly under
consideration of an intrinsic safety installation check.
Alternatively, an Ex modem can be connected to the circuit
outside the potentially explosive atmosphere.
Operating instructions
Protection against electrostatic discharges
The plastic parts inside the device can store electrostatic
charges.
Make sure that no electrostatic charges can accumulate when
handling the device.