12 VA Master FAM540 METAL CONE VARIABLE AREA FLOWMETER | OI/FAM540-EN REV. E
… 2 Use in potentially explosive atmospheres in accordance with ATEX and IECEx
… Installation instructions
Type of protection Ex d - flameproof (enclosure)
Model FAM540, order code A9
The flowmeter is electrically connected via the ATEX / IECEx-
approved cable gland with Ex-d type of protection (see Figure 1)
located on the device.
Alternatively, the flowmeter can be connected using conduit
systems. In Ex-d type of protection, the connection must be
made using an ATEX / IECEx approved pipe fitting with a flame
barrier. The mechanical ignition barrier must be installed directly
on the housing.
The preinstalled cable gland must be removed before connecting
a pipe fitting. The M25 × 1.5 / ½ in NPT adapter remains
unchanged on the device.
Note
Pipe fittings with flame barriers are not included in the scope of
supply.
Only ATEX / IECEx approved pipe fittings with a flame barrier
may be used with Ex-d type of protection. The use of cable and
wire entries, pipe fittings or sealing plugs without an Ex-d type
examination certificate is prohibited.
Unused openings must be closed with Ex-d-approved sealing
plugs.
1 Strain relief
2 Adapter M25 × 1.5 / ½ in NPT
3 Gasket
4 Sleeve
5 Union nut
Figure 1: Connection using a flameproof cable gland
The outside diameter of the unshielded connection cable must
be in a range from 7.2 to 11.7 mm (0.3 to 0.5 in). After installing
the cable in the fitting, tighten the union nut using a torque of
3.25 Nm (2.40 lb/ft). Use additional strain relief in the housing to
secure the connection cable.
Electrical connections
Potentially explosive atmosphere Non-hazardous area
1 Namur switching amplifier
2 Safety barrier
3 Potential equalization
Figure 2: ATEX / IECEx electrical connection
Terminal Function
31 / 32 Power supply / current output / HART output
41 / 42 Programmable binary output
Alarm signaling unit (min.)
51 / 52 Alarm signaling unit (max.)
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