TTH300
| OI/TTH300-EN Rev. D 11
3.2
Installation instructions
3.2.1
FM / CSA
The installation, commissioning, maintenance and repair of
devices in areas with explosion hazard must only be carried
out by appropriately trained personnel.
The operator must strictly observe the applicable national
regulations with regard to installation, function tests, repairs,
and maintenance of electrical devices. (e.g. NEC, CEC).
3.2.2
IP protection rating of housing
The temperature transmitter and LCD indicator types A and
AS must be installed such that the IP rating of at least IP20 is
achieved in accordance with IEC 60529.
3.2.3
Electrical connections
Earthing
If, for functional reasons, the intrinsically safe circuit needs to
be earthed by means of a connection to the potential
equalization, it may only be earthed at one point.
Intrinsic safety installation check
If transmitters are operated in an intrinsically safe circuit, proof
that the interconnection is intrinsically safe must be provided
in accordance with IEC/EN 60079-14 as well as
IEC/EN 60079-25.
The supply isolators / DCS inputs must feature intrinsically
safe input protection circuits in order to eliminate hazards
(spark formation).
In order to provide proof of intrinsic safety, the electrical limit
value must be used as the basis for the EC-type examination
certificates for the equipment (devices); this includes the
capacitance and inductance values of the cables.
Proof of intrinsic safety is said to have been provided if the
following conditions are fulfilled when a comparison is carried
out in relation to the limit values of the equipment:
Transmitters
(intrinsically safe equipment)
Supply isolator / DCS input
(related equipment)
U
i
≥ U
o
I
i
≥ I
o
P
i
≥ P
o
L
i
+ L
c
(cable)
≤
L
o
C
i
+ C
c
(cable)
≤
C
o
Field (Ex area)
Control room (safe area)
Fig. 6
A
Transmitter
B
Supply isolator / DCS input with supply / Segment
coupler
Installation in a potentially explosive atmosphere
Transmitters can be installed in all kinds of industrial sectors.
Potentially explosive systems are divided into zones, meaning
that a wide range of different instruments are also required.
For this, pay attention to the country-specific guidelines and
certificates!
NOTICE
Ex relevant specifications must be taken from the EC-type
examination certificates and other relevant certificates that
apply in each case.
With transmitters for PROFIBUS PA and FOUNDATION
Fieldbus H1 applications, FISCO interconnection methods can
be used.
3.3
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.
3.4
Operating instructions
3.4.1
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.
A10096
A
B
+
-
+
-
