FISCO-Concept
HAZARDOUS (CLASSIFIED) LOCATION
NON HAZARDOUS LOCATION
The FISCO Concept allows interconnection of intrinsically safe apparatus to associated apparatus not specifically examined in
such combination.
The criteria for interconnection is that the voltage (Ui or Vmax), the current (Ii or Imax) and the power (Pi or Pmax) which
intrinsically safe apparatus can receive and remain intrinsically safe, considering faults, must be equal or greater than the voltage
(Uo or Voc or Vt), the current (Io or Isc or It) and the power (Po or Pmax) levels which can be delivered by the associated
apparatus, considering faults and applicable factors.
Class I, Zone 0, IIC
Class I, Division 1, 2, Groups A, B, C, D
Class II, Division 1, 2, Groups E, F, G
Class III, Division 1
Any FM
approved
associated
apparatus or
associated
nonincendive
field wiring
apparatus
In addition, the maximum unprotected capacitance (Ci) and inductance (Li) of each apparatus (other than the termination)
connected to the fieldbus must be less than or equal to 5 nF and 10 µH respectively.
In each segment only one active device, normally the associated apparatus, is allowed to provide the necessary energy for
the fieldbus system. The voltage Uo (or Voc or Vt) of the associated apparatus has to be limited to the range of 14 V to 24 V d.c.
All other equipment connected to the bus cable has to be passive, meaning that they are not allowed to provide energy to
the system, except to a leakage current of 50 µA for each connected device.
suitable for
FISCO concept
Separately powered equipment needs a galvanic isolation to assure that the intrinsically safe fieldbus circuit remains passive.
Ground
Stud
Ground
Stud
Ground
The cable used to interconnect the devices needs to have the parameters in the following range:
Stud (internal)
I.S. Ground
Shield
loop resistance R:
inductance per unit length L:
capacitance per unit length C:
15...150 W/km
0.4...1 mH/km
80...200 nF/km
C = C line/line + 0,5 C line/screen, if both lines are floating or
C = C line/line + C line/screen, if the screen is connected to one line
length of spur cable:
length of trunk cable:
length of splice:
£ 30 m
£ 1 km
£ 1 m.
1
-
2
3
1
2
3
1
-
2
+
+
-
+
At each end of the trunk cable an approved infallible line termination with the following parameters is suitable:
R = 90...100 W
C = 0...2.2 µF.
One of the allowed terminations might already be integrated in the associated apparatus.
The number of passive devices connected to the bus segment is not limited due to I.S. reasons.
If the above rules are respected, up to a total lenght of 1000 m (sum of the length of trunk cable and all spur cables),
the inductance and capacitance of the cable will not impair the intrinsic safety of the installation.
Micropilot FMR 2xx with electronic
insert for PROFIBUS PA or
FOUNDATION Fieldbus (FISCO-Model)
F12
or
or
T12 OVP
F23
F12, F23 enclosure
T12-OVP enclosure
Intrinsically safe installation
Intrinsically safe (entity), Class I, Div. 1, Groups A, B, C, D Hazardous Location Installation.
Ui (Vmax) = 17.5 V
Ii (Imax) = 500 mA
Pi (Pmax) = 5.5 W
Ui (Vmax) = 17.5 V
Ii (Imax) = 273 mA
Pi (Pmax) = 1.2 W
Option (1), only F12, F23:
Prepared to connect FM
approved remote display type
FHX40 from Endress+Hauser
Any
FM approved
Intrinsically
Safe apparatus
suitable for
FISCO Concept
1. FM approved apparatus must be installed in accordance with manufacturer instructions.
2. FM approved associated apparatus must meet the following requirements:
Uo or Voc or Vt £ Ui (Vmax) and Io or Isc or It £ Ii (Imax) and Po or Pmax £ Pi (Pmax).
3. The maximum non-hazardous area voltage must not exceed 250 V.
4. The installation must be in accordance with the National Electrical Code NFPA 70 and ANSI/ISA RP 12.06.01
(except chapter 5).
<
Ci 5 nF
=
<
Li 10 µH
=
<
Leakage current 50 µA
=
5. Multiple earthing of screen is allowed only, if high integrity equipotential system is realised between the points of
bonding (see drawing No. 960373-1022 A).
6. Caution: Use only supply wires suitable for 5 K above surrounding temperature.
7. Warning: Substitution of components may impair intrinsic safety.
8. The polarity for connecting + (2) and – (1) is of no importance due to an internal rectifier.
9. FMR250: Use of scavenge junction.
Option (2):
Interconnection with FM
approved Service Interface
Commubox FXA193 with ToF-
Cable from Endress+Hauser
Any FM approved
termination with
R = 90...100 W
C = 0...2.2 µF
R
C
It is the users responsibility to use the adequate method by using the scavenge device, like:
Installation has to be IP-grade 67 resp. IP-grade 65 (IEC/EN 60529), depends on location.
Scavege pressure > inside pressure at the container, max 10 bar resp. 150 psi.
At non-scavenge status, a barrier spigot resp. valve must be closed.
If the valve / spigot is open and no scavenge fluid is present the risk of flammable gas or combustible dust
releases and flame entrance from outside exists.
Permissible ambient temperature: Electronic: F12, F23, T12-OVP enclosure –40...+80 °C resp. –40...176 °F
Temperature Permissible
Permissible max. ambient temperature of the electronic compartment (Ta)
FMR250 (Horn or parabolic antenna) FMR255
Option 20 (Antenna): Option 20 (Antenna):
10. FMR255: Avoid electrostatic charge at the antenna; (e.g. do not rub with dry cloth; do not install within the filling curtain).
11. Apparatus with faucet: In case of disconnection of Micropilot M from the faucet (e.g. for maintenance) we recommend to
secure resp. to close the faucet e.g. with an additional blind flange. The responsibility for applicability of the arrangement
behooves exclusive the operator.
class
max. medium
temperature
at the probe
(process
with/without
display
VU331
12. T12-OVP housing: The surge protection device (OVP) fulfills the requirements of IEC 60079-14 clause 12.3.
4, 5 or 6
D, E, G, H or 92)
connection)
Tmed
Division 2 and Zone 2 installation
Nonincendive, Class I, Div. 2, Groups A, B, C, D Hazardous Location Installation.
F12 or T12-OVP
housing
F23
housing
F12 or T12-OVP
housing
F23
housing
F12 or T12-OVP
housing
F23
housing
1. Installation shall be in accordance with NEC using threaded conduits or other wiring methods in accordance with Article 500
through Article 510. Intrinsic safety barrier not required. Max. supply voltage 33 V. For T-code see table.
2. Nonincendive field wiring installation.
The Nonincendive Field Wiring Circuit Concept allowes interconnection of nonincendive field wiring apparatus with associated
nonincendive field wiring apparatus or associated apparatus not specifically examined in combination as a system using
any of the wiring methods permitted for unclassified locations, when Vmax ³ Voc or Vt, Ca ³ Ci + Ccable, La ³ Li + Lcable.
Transmitter non incendive field wiring parameters for these current controlled circuit are as follows:
Vmax = 33 V; Ci £ 5 nF; Li £ 10 µH; Imax = see note 3.
T6
T5
T4
+
+
80 °C
60 °C
+55/50 °C
+60/55 °C
+55/50 °C
+60/55 °C
+55/50 °C
+60/55 °C
+55/50 °C
+60/55 °C
+55/50 °C
+60/55 °C
+55/50 °C
+60/55 °C
+
+
95 °C
75 °C
+70/65 °C
+75/70 °C
+70/65 °C
+75/70 °C
+70/65 °C
+75/70 °C
+70/65 °C
+75/70 °C
+70/65 °C
+75/70 °C
+70/65 °C
+75/70 °C
+130 °C
80 °C
+75 °C
+80 °C
+70 °C
+80 °C
+70 °C
+80 °C
+70 °C
+80 °C
+70 °C
+80 °C
+65 °C
+80 °C
+
3. For these current controlled circuit, the parameter Imax is not required and need not to be aligned with parameter Isc and
It of the associated nonincendive field wiring apparatus or associated apparatus.
4. Warning: Explosion Hazard - do not disconnect equipment unless power has been switched off or the area is known to be
Non-Hazardous.
Warning: Substitution of components may impair suitability for Class I, Division 2.
T3C
(functional)1)
+150 °C
+ 80 °C
+73 °C
+80 °C
+68 °C
+80 °C
+70 °C
+80 °C
+68 °C
+80 °C
+65 °C
+80 °C
+60 °C
+80 °C
T3
+195 °C
80 °C
+70 °C
+80 °C
+65 °C
+80 °C
+65 °C
+80 °C
+60 °C
+80 °C
---
---
+
5. The transmitter is suitable to be installed according the FNICO concept.
T2, T1
(functional)1)
+200 °C
+ 80 °C
+70 °C
+80 °C
+65 °C
+80 °C
+65 °C
+80 °C
+60 °C
+80 °C
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---
Class II, III installation
DIP for Class II and III, Div. 1, Groups E, F, G Hazardous Location Installation.
Note: the applicable temperature of antenna must be within their specified limits
1) functional means max. permissible process temperature
1. Installation shall be in accordance with NEC using threaded conduits or other wiring methods in accordance with Article 500
through Article 510.
2) special version of horn or parabolic reflector dimensions
st
For Installaion acc. -ENTITY- Concept
see Control dwg. part 960007257
2. Use a dust tight seal at the conduit entry.
nd
T6 and T5 requires for FF-electronic enlarged derating: for ambient; 1 number = PA electronic insert; 2 number = FF electronic insert
e.g. +60/55 °C expression means: Apparatus with PA electronic insert max. ambient at housing = +60 °C;
Apparatus with FF electronic insert max. ambient at housing = +55 °C
Functional ratings:
These ratings do not supersede Hazardous Locations values Unom £ 33 V, Inom = 15 mA.
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