24 CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | OI/FCB400/FCH400-EN REV. E
… 2 Use in potentially explosive atmospheres
… Operating instructions
Changing the type of protection
If you are installing in Zone 1 / Div. 1, the current outputs and digital outputs of models FCB430/450 and FCH430/450 can be
operated with different types of protection:
• Current output and digital output in the ‘intrinsically safe ia / IS’ design
• Current output and digital output in non-intrinsically safe design
If a device that is already operational is operated with a different type of protection, the following measures must be
implemented/insulation checks performed in accordance with applicable standards.
Original installation New installation Necessary test steps
Zone 1 / Div. 1:
Current outputs and digital outputs in
non-intrinsically safe design
Zone 1 / Div. 1:
Current outputs and digital outputs in
intrinsically safe ia / IS design
• 500 V AC/1min or 500 × 1.414 = 710 V DC/1min
Test between terminals A / B, U
FE
, /GND, U
CO
/ 32, 31 / 32, 41 / 42, 51 / 52,
V1 / V2 and V3 / V4, and terminals A, B, U
FE
, GND, U
CO
, 31, 32, 41, 42, 51, 52,
V1, V2, V3, V4 and the housing.
When this test is performed, no voltage flashover is permitted in or on the
device.
• Optical evaluation particularly of the electronic circuit boards, no visible
damage or evidence of explosion.
Zone 1 / Div. 1:
Current outputs and digital outputs in
intrinsically safe ia(ib) / IS design
Zone 1 / Div. 1:
Current outputs and digital outputs in
non-intrinsically safe design
• Visual inspection, no damage visible on the threads (cover, ½ in NPT cable
glands).
Change from one to tw o columns
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