10
FMT230, FMT250
THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. B
… 2 Use in potentially explosive atmospheres in accordance with ATEX and IECEx
… Installation instructions
Cable entries
The cable glands supplied are ATEX-/IECEx-certified.
The use of standard cable glands and seals is prohibited.
The black plugs in the cable fittings are intended to provide
protection during transport. Any unused cable entries must be
sealed prior to commissioning, using the seals supplied.
The outside diameter of the connection cable must measure
between 6 mm (0.24 in) and 12 mm (0.47 in) to guarantee the
required tightness.
Black cable fittings are installed by default when the device is
supplied. If signal outputs are connected to intrinsically safe
circuits, replace the black cap on the corresponding cable gland
with the blue one supplied.
Note
In order to provide the required temperature resistance, devices
in the low-temperature design (optional – in preparation,
ambient temperature up to −40
°C [40 °F]) are delivered with
metal cable glands.
These are then also to be used in intrinsically safe circuits.
Electrical connections
Grounding
The sensor must be grounded in accordance with the applicable
international standards.
Perform grounding of the device in accordance with
Pin
assignment
on page 41.
Operating instructions
Protection against electrostatic discharges
DANGER
Risk of explosion!
The painted surface of the device can store electrostatic
charges.
As a result, the housing can form an ignition source due to
electrostatic discharges in the following conditions:
• The device is operated in environments with a relative
humidity of ≤
30 %.
• The painted surface of the device is thereby relatively free
from impurities such as dirt, dust or oil.
• Instructions on avoiding ignition in potentially explosive
environments due to electrostatic discharges in
accordance with PD CLC/TR 60079-32-1 and IEC TS 60079-
32-1 must be complied with!
Instructions on cleaning
The painted surface of the device must be cleaned only using a
moist cloth.
Devices which are approved for use in potentially explosive
atmospheres have an additional warning plate.
1
Warning
– Do not open in a flammable or potentially explosive
atmosphere.
1
WARNING!
– Danger due to electrostatic discharge.
Figure 1: Warning signs on the device
Repair
Contact ABB before commencing repair work.
