Test Terminals For Output Signal - Siemens SITRANS T Series Compact Operating Instructions
Temperature transmitters
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- Compact operating instructions (94 pages) ,
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Table 4-8
For T
a
Maximum values of the auxiliary power supply and signal circuits in accordance with FNICO/FISCO:
U
= 17.5 V DC
i
L
= 1 μH
i
Maximum values of the sensor circuit:
U
= 5.7 V DC:
0
L
[mH]
0
C
[μF]
0
Zone 2 in type of protection "nA" - non-sparking resources
● Install the transmitter in an enclosure meeting the degree of protection IP54 per EN 60529, e.g. in a type B connection
head per DIN 43729.
● Adhere to the conditions for installers applicable to this type of protection.
● The maximum approved input voltage is U
Maximum values of the sensor circuit:
U
= 5.7 V DC:
0
L
[mH]
0
C
[μF]
0
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. The surface temperature of the enclosure is euqal to T
with a maximum thickness of 5 mm.
4.5
Safety notes for connecting in hazardous TF
WARNING
Risk of explosion due to electrostatic charge
To prevent an electrostatic charge in a hazardous area, close the key cover during operation and tighten the screws
securely.
Type of protection "Flameproof enclosure" and "Dust protection by enclosure"
Only open devices with type of protection "Flameproof enclosure" in hazardous areas when the power to the device is
turned off, otherwise there is a risk of explosion.
For SITRANS TF connection in hazardous areas
The SITRANS TF comes with a built-in transmitter: SITRANS TH200, TH300, or TH400. See Safety notes for connecting in
hazardous TH200/300 (Page 14).
4.6
Special safety consideration for connecting SITRANS TH300/TH400
● Use shielded cables to ensure the full specification according to HART, PROFIBUS PA, or FOUNDATION Fieldbus
4.7
Test terminals for output signal
The "Test +" and "Test -" test terminals are used for checking the 4 to 20 mA current with an amperemeter. The voltage drop
across the amperemeter must not exceed 0.4 V for a 23 mA output current.
SITRANS TH/TR/TF
A5E32520716-01, 06/2013
≤ 85 °C (T4); T
≤ 75 °C (T5); T
a
I
= any
i
C
= 2 nF
i
= 32 V DC.
n
≤ 60 °C (T6)
a
I
= 8.4 mA
0
200
40
I
= 8.4 mA
0
200
40
P
= any
i
P
= 12 mW
0
P
= 12 mW
0
plus 20 K for a dust layer
a
17
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