TTF300
FIELD-MOUNT TEMPERATURE TRANSMITTER | CI/TTF300-EN REV. H
15
Dust explosion protection – Zone 0/21
Housing design: ATEX II 2D Ex tb IIIC T135°C Db
Transmitter design: ATEX II 1G Ex ia IIC T6...T1 Ga
Ex-area
Zone 0
Ex area Zone 21
Safe area
A
Sensor
B
TTF300 transmitter
C
Intrinsically safe supply isolator in ‘Ex ia’ or ‘Ex ib’ type of protection
D
Interface for LCD indicator
Figure 9: Hookup in Zone 0/21 (dust explosion protection)
When using the sensor in Zone 0 and the transmitter in Zone 21,
the transmitter must be approved for Zone 21, while the sensor
circuit must be designed in the ‘Ex ia’ type of protection and the
supply circuit as well as the power supply unit in the ‘Ex ia’ or
‘Ex ib’ type of protection.
As the user, it is your responsibility to ensure that the sensor
instrumentation meets the requirements of applicable explosion
protection standards.
Flameproof (enclosure) – Zone 1
Housing design: ATEX II 2G Ex db IIC T6/T4 Gb
Ex area Zone 1
Safe area
A
Sensor
B
Transmitter in Ex d-housing
C
Supply isolator with voltage limit (30 V)
D
Fuse, 32 mA
E
Interface for LCD indicator
Figure 10: Hookup in Zone 1, ‘flameproof (enclosure)’ type of protection
The power supply circuit of the transmitter must be limited by
an upstream fuse with a fuse current rating of 32 mA.
Maximum input terminal voltage of the transmitter: 30 V DC.
The ‘flameproof enclosure’ type of protection is only achieved by
correctly installing a specially certified cable gland with the Ex d
type of protection with the corresponding marking.
The sensor instrumentation must be provided by the user in
accordance with the valid Ex-standards.
As far as the installation and mounting of components is
concerned (explosion-proof cable entries, connection parts),
only those components are approved which at the least
technically comply with the current version of the PTB 99 ATEX
1144 X type examination certificate and for which a separate
examination certificate exists. At the same time, it is imperative
that the operating conditions listed in the respective component
certificates are complied with.
