Safety Notes For Connecting In Hazardous Th400 - Siemens SITRANS TH Series Compact Operating Instructions

Maximum values of the sensor circuit for Ex ia:
U = 6 V DC:
0
L [mH]
0
C [μF]
0
Zone 2 in type of protection "ic" - intrinsic safety
● Only connect the transmitter, in accordance with the certificate of compliance, to devices certified as intrinsically-safe.
Maximum values of the auxiliary power supply and signal circuits:
U = 30 V DC
i
L = 2 μH
i
Maximum values of the sensor circuit:
U = 6 V DC:
0
L [mH]
0
C [μF]
0
Zone 2 in type of protection "nA" - non-sparking resources
● Adhere to the conditions for installers applicable to this type of protection.
● The maximum approved input voltage is U
● Take measures to ensure that the supply voltage (including transients) does not rise above 140 % of the rated voltage.
Additional requirements for use in dust explosion protected areas
Install the transmitter in an enclosure suitable for the respective type of dust and corresponding Zone in accordance with the
inspection certificate valid in your country.
4.4

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 4-1 For T
a
Maximum values of the auxiliary power supply and signal circuits:
U = 30 V DC
i
L = 1 μH
i
Table 4-2 For T
a
Maximum values of the auxiliary power supply and signal circuits:
U = 30 V DC
i
L = 1 μH
i
SITRANS TH/TR/TF
A5E32520700-01, 06/2013
I = 25 mA
0
50
1
I = 100 mA
i
C = 13 nF
i
I = 25 mA
0
50
1
= 32 V DC.
n
≤ 85 °C (T4); T ≤ 70 °C (T5); T
a
I = 120 mA
i
C = 2 nF
i
≤ 75 °C (T4); T ≤ 65 °C (T5); T
a
I = 300 mA
i
C = 2 nF
i
P = 37 mW
0
10
1.6
P = 37 mW
0
10
1.6
≤ 60 °C (T6)
a
≤ 45 °C (T6)
a
1
2.6
P = 750 mW
i
1
2.6
P = 840 mW
i
P = 1300 mW
i
0.1
4.8
0.1
4.8
15