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Brannstrom Sweden AB
CleanTrack 1000B - Rev 2.20xd, 2019
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36
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4.11. Calculations on intrinsically safe arrangements
This chapter is a guidance, and nothing but a guidance, on how to demonstrate the intrinsically safety margins of the
installation. The installation engineer, and no one but the installation engineer, is responsible for the intrinsically safety
of the installation. No responsibility is given for the data below. Correct data is printed on the actual included apparatus
or its certificate.
The Zener barriers, ZBs, in the Converting Unit are arranged in order to supply 5 separate intrinsically safe circuits,
ISC. The following data applies to zone IIC.
Table of entity parameters
Parameter
Circuit F2
Circuit F1
Circuit P
Circuit D
Circuit MC
Co
90nF/80nF
90nF/80nF
90nF/80nF
2.5μF
2.5μF
Lo
3mH/1.4mH
3mH/1.4mH
3mH/1.4mH
3mH
0.9mH
Uo
26V
26V
26V
8.41V
8.41V
Io
81mA
81mA
81mA
59.6mA
193.1mA
Po
0.53W
0.53W
0.53W
0.187W
0.41W
ISF2/F1 Intrinsically safe Flow meter.
•
Values below from Fuji flow meter, type FCX-AIII or FCX-AII. See chapter
page
ISP
Intrinsically safe Pressure transmitter.
•
Values below from Siemens type /MF156x.
ISD
Intrinsically safe mechanical switch.
•
Values below from an unspecified type.
ISMC Intrinsically safe Measuring Cell
•
Values below from Measuring Cell type CTB11.
Note: The values for ISF2/F1, ISP and ISD depends on the actual apparatus.
Parameter
ISF2
ISF1
ISP
ISD
ISMC
Ci
26nF
26nF
0nF
0nF
2μF
Li
0.6mH
0.6mH
0mH
0mH
0.165mH
Ui
28V
28V
30V
28V
8.41V
Ii
94.3mA
94.3mA
100mA
100mA
193.1mA
Pi
0.66W
0.66W
0.750W
----
0.41W
Any apparatus should relate to the supplying zener barrier circuit in the following way:
Pi ≥ Po
Ui ≥ Uo
Ii ≥ Io
Co – Ci = Cm
Lo – Li = Lm
Below follows Cm and Lm margins based on the circuit and apparatus data below:
Parameter
Circuit F2/ISF2
Circuit F1/ISF1
Circuit P/ISP
Circuit D/ISD
CircuitMC/ISMC
Cm
54nF
54nF
80nF
2.5μF
0.5μF
Lm
0.8mH
0.8mH
1.4mH
3mH
0,735mH
Ccable
200pF/m
200pF/m
200pF/m
200pF/m
200pF/m
Lcable
1μH/m
1μH/m
1μH/m
1μH/m
1μH/m
The Ccable and Lcable are typical values given in EN_60079-14, calculation for the actual cable in use shall be made.
Maximum cable length for Circuit F/ISF is 270m.
•
If wiring is both in cable Cb3 and Cb7, values for actual length in both cables must be added.
Maximum cable length for Circuit P/ISP is 400m.
Maximum cable length for Circuit D/ISD is 3000m.
Maximum cable length for Circuit MC/ISMC is 735m.
•
The maximum tested length of this cable, Cb7, is 100m.
Also check the temperature class of installed intrinsically safe apparatus and if the specified zone is acceptable.
Concerning cables to intrinsically safe equipment the writing in the standard, IEC 60079-14, is:
Summary of Contents for CleanTrack 1000 B
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