TTF300 FIELD-MOUNT TEMPERATURE TRANSMITTER | CI/TTF300-EN REV. H 23
Explosion protection marking for devices with several
types of protection
Coding of the type of protection of the device in accordance
with ordering information can also refer to different explosion
approvals for various types of protection.
The ‘intrinsic safety’, ‘flameproof (enclosure)’ and ‘dust
explosion protection’ types of protection can be possible for one
device.
The following figure shows an example of explosion protection
marking for the ‘intrinsic safety’ and ‘flameproof (enclosure)’
types of protection:
Checkboxes for marking type of protection
Figure 16: Example of several types of protection: “Intrinsic safety” and “Flameproof
(enclosure)”, coding of the type of protection: E4.
Measures required before the use of devices with several
types of protection
Note for temperature transmitters with multiple types of
protection
Before the transmitter is installed, the selected type of
protection must be indelibly marked on the explosion
protection certification plate.
The transmitter can then only be operated with this degree of
protection throughout its entire service life.
• If two protection types are indelibly marked on the
explosion protection certification plate, the transmitter
must not be used in areas categorized as hazardous.
Devices with several types of protection may only be operated in
one of the possible types of protection.
Before commissioning, users must decide on one of these types
of protection and their corresponding approval.
• The ‘E4’ coding enables the following types of protection:
‘Intrinsic safety’, type ‘TTF300-E1’ and ‘Flameproof
(enclosure)’, type ’TTF300-E3’.
• The ‘D6’ coding enables the following types of protection:
‘Intrinsic safety’, type ‘TTF300-E1’ and ‘Dust explosion
protection’, type ’TTF300-D5’.
Additional combinations are generally possible.
Use in explosive hybrid mixtures (where explosive dusts and
gases are present simultaneously) is not currently permitted in
accordance with EN 60079-0 and EN 60079-31.
The additional plate has two checkboxes (see Figure 16) for
marking.
It is absolutely necessary to mark one of the checkboxes on the
left side indelibly in accordance with the selected type of
protection of the application. This has to be done before the
TTF300 is commissioned in the application.
The marking must be applied in a permanent and indelible
manner, for example by using a caustic or acidic pencil or by
stamping the marking on a metallic plate.
Unmarked devices must NOT be commissioned.
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