Use In Potentially Explosive Atmospheres; Approvals; Housing Ingress Protection; Electrostatic Charging - ABB TTH300 Operating Instruction

Use in potentially explosive atmospheres

2 Use in potentially explosive atmospheres
Special regulations must be observed in potentially explosive atmospheres for the power
supply, signal inputs/outputs, and ground connection. The information relating specifically to
explosion protection that appears within the individual sections must be observed.
Notice - Potential damage to parts!
All parts must be installed in accordance with the manufacturer's specifications, as well as
relevant standards and regulations.
Commissioning and operation must comply with EN 60079-14 (Electrical apparatus for
explosive gas atmospheres).
2.1

Approvals

Codes relating to the approvals for use in potentially explosive atmospheres can be found in the
section titled "Ex relevant specifications" in this manual.
2.2

Housing ingress protection

The connection parts of the temperature transmitter and LC display types A and AS must be
installed so that housing ingress protection of at least IP 20 as per IEC 60529:1989 is achieved.
2.3

Electrostatic charging

When using the transmitter in a potentially explosive atmosphere, please ensure that
impermissible electrostatic charging of the temperature transmitter and the LC display is
prevented (observe the warnings on the device).
2.4

Grounding

If, for functional reasons, the intrinsically safe circuit needs to be grounded by means of a
connection to the equipotential bonding, it may only be grounded at one point.
2.5

Interconnection

If transmitters are operated in an intrinsically safe circuit, proof that the interconnection is
intrinsically safe must be provided in accordance with DIN VDE 0165/Part 1 (EN 60079-25/2004
and IEC 60079-25/2003). An interconnection certificate must always be provided for intrinsically
safe circuits.
2.6

Configuration

The transmitter can be configured in the potentially explosive atmosphere in compliance with
the interconnection certificate, both directly in the potentially explosive atmosphere using
approved handheld terminals and by coupling an Ex modem into the circuit outside the
potentially explosive atmosphere.
2.7

Ex relevant specifications

See Chapter 11, "Ex relevant specifications" page 65.
14 TTH300 OI/TTH300-EN