Safety Information When Connecting; Safety Notes For Connecting In Hazardous Th200/300 - Siemens SITRANS T Series Operating Instructions Manual

Connecting

5.1 Safety information when connecting

5.1 Safety information when connecting
Improper power supply
Danger of explosion in hazardous areas as result of incorrect power supply, e.g. using
direct current instead of alternating current.
• Connect the device in accordance with the specified power supply and signal circuits.
5.1.1

Safety notes for connecting in hazardous TH200/300

The 4 to 20 mA input and sensor circuits are electrically isolated and have been tested with a
voltage of 1.5 kV DC/1 minute.
The sensor circuit is reliably galvanically isolated from the auxiliary power supply and signal
circuit, up to a peak value of the rated voltage of 60 V. Be sure to observe the construction
directives valid at the construction location for electrical resources in hazardous areas. In
Europe, this is the standard EN 60079-14.
Zone 0, 1, 2 in type of protection "ia/ib/ic" - intrinsic safety
● Only connect the transmitter, in accordance with the certificate of compliance, to devices
certified as intrinsically-safe.
● If the connection head is made of aluminum, the requirements of EN 60079-26, section
4.3.3, must be observed for uses where the device category 1 G is required.
● The transmitter must be mounted in an enclosure in order to provide a degree of
protection of at least IP20 according to EN60529
Maximum values of the auxiliary power supply and signal circuits:
U = 30 V DC
i
L = 104 μH
i
Maximum values of the sensor circuit for Ex ia:
U = 6 V DC:
0
L [mH]
0
C [μF]
0
24
WARNING
The relevant specifications can be found in the certificates, in Chapter "Technical data
(Page 65)" or on the nameplate.
I = 25 mA
0
50
1
I = 100 mA
i
C = 11 nF
i
P = 37 mW
0
10
1.6
Operating Instructions, 08/2015, A5E00393069-04
P = 750 mW
i
1 0.1
2.6 4.8
SITRANS TH200/TH300