20 SensyMaster FMT430, FMT450 THERMAL MASS FLOWMETER | OI/FMT430/450-EN REV. B
… 2 Use in potentially explosive atmospheres
Operating instructions
Protection against electrostatic discharges
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.
Warning – Do not open in a flammable or potentially explosive
atmosphere.
WARNING! – Danger due to electrostatic discharge.
Figure 3: Warning signs on the device
Devices with dual-compartment housing with type of
protection Ex ‘d’ flameproof (enclosure)
Figure 4: Mounting screws on the dual-compartment transmitter housing
Special conditions for safe use!
For devices with dual-compartment housing with type of
protection Ex ‘d’, the following instructions must be observed:
• The mounting screws 1 used to connect the dual-
compartment housing to the sensor shall be M5 × 20 A2
gemäß according DIN 7964.
• The mounting screws shall have a yield stress of at least
2
Repair
Devices of type of protection ‘d’ are equipped with flameproof
joints in the housing. Contact ABB before commencing repair
work.
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