Safety Notes For Connecting In Hazardous Th400 - Siemens SITRANS TH400 Operating Instructions Manual

Connecting
5.1 Safety Notes
Risk of explosion when using unsuitable HART device
Only intrinsically safe HART modems or HART communicators are allowed to be operated
in the intrinsically safe area or on intrinsically safe circuits.
Note
Electrical data and T
Electrical data and T
(http://www.siemens.com/processinstrumentation/certificates)
5.1.1

Safety notes for connecting in hazardous TH400

The input circuit is thus electrically isolated from the sensor circuit. The isolation does not
satisfy the requirements for infallible electrical isolation in the sense of the intrinsic safety
standard EN / IEC 60079-11, but does withstand a test voltage of 500 V AC/1 minute.
Zone 0 in type of protection "ia" - 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
Table 5- 1
Maximum values of the auxiliary power supply and signal circuits:
U = 30 V DC
i
L = 1 μH
i
Table 5- 2
Maximum values of the auxiliary power supply and signal circuits:
U = 30 V DC
i
L = 1 μH
i
20
WARNING
amb
are dependent on Ex-protection class, see Certificates
amb
For T ≤ 85 °C (T4); T
a
For T ≤ 75 °C (T4); T
a
≤ 70 °C (T5); T ≤ 60 °C (T6)
a a
I = 120 mA
i
C = 2 nF
i
≤ 65 °C (T5); T ≤ 45 °C (T6)
a a
I = 300 mA
i
C = 2 nF
i
Operating Instructions, 03/2014, A5E01018688-03
P = 840 mW
i
P = 1300 mW
i
SITRANS TH400