Namur Contact; Cable Entries; Flowmeter Sensor Insulation; Operation In Zone 2 With Protection Class "Restricted Breathing" (Nr) - ABB CoriolisMaster FCB300 Serie Instrucciónes De Puesta En Marcha

6.4.3

NAMUR contact

„A"
2 1
BR902
„B"
2 1
BR902
Fig. 27: Positions of jumpers
"A" Standard wiring | "B" NAMUR wiring
1 Jumper BR902 | 2 Jumper BR901
Jumper Number Function
BR902 1 Standard configuration, preferred for Ex "e"
(factory default)
BR901 1
BR902 2 NAMUR configuration, preferred for Ex "i"
BR901 2
The switching output and the pulse output (terminals 41 / 42
and 51 / 52) can be wired internally as a NAMUR contact for
the purpose of connecting to a NAMUR amplifier; this is
achieved by setting the jumpers accordingly.
6.4.4

Cable entries

Special instructions for devices with North American
certification
Devices certified in accordance for North America are only
ever supplied with 1/2" NPT threads without glands.
6.4.5

Flowmeter sensor insulation

If the flowmeter is to be insulated, follow the instructions in the
"Mounting / Installation positions / Installation with option TE1
"extended tower length"" section.
30 - EN CI/FCB300-X1 Rev. C | CoriolisMaster FCB330, FCB350
1
2
G10368
6.4.6 Operation in Zone 2 with protection class
"restricted breathing" (nR)
The transmitter housing (rectangular or round, compact or
separate) can be operated in Zone 2 with protection class
"restricted breathing" (nR).
WARNING – Potentially adverse effect on
protection class
The operator must check the device in
accordance with IEC 60079-15 following
installation or maintenance, or each time the
housing has been opened (see chapter
"Important notes to test the device").
Important notes to test the device
According to IEC 60079-15 chapter 23.2.3.2.1.2 "Equipment
without test port" observe the following points:
— Under constant temperature conditions, the time interval
required for an internal pressure of at least
0.3 kPa (30 mmWS) below atmospheric to change to half
the initial value shall be not less than 180 seconds.
Alternatively following test procedures may be used to shorten
the time needed for the routine tests:
— Under constant temperature conditions, the time interval
required for an internal pressure of 0.3 kPa (30 mmWS)
below atmospheric to change to 0.27 kPa (27 mmWS)
below atmospheric shall be not less than 27 seconds.
— Under constant temperature conditions, the time interval
required for an internal pressure of 3.0 kPa (300 mmWS)
below atmospheric to change to 2.7 kPa (270 mmWS)
below atmospheric shall be not less than 27 seconds.
IMPORTANT (NOTE)
If using the low value of pressure (0.3 kPa
(30 mmWS)) creates difficulties, the alternative
10 times higher figures (3.0 kPa (300 mmWS))
may be used.