ABB TTF200, Operating Instruction, Page: 17 / 36

TTF200 FIELD-MOUNT TEMPERATURE TRANSMITTER | OI/TTF200-EN REV. A 17
The following items should be observed to protect the
transmitter from sensor-side damage:
— In the vicinity of the transmitter, sensor and sensor
connector cable in case of a connected sensor, high-
energy overvoltage, overcurrent and high-frequency
interference signals due to welding operations,
lightning, circuit breakers or large consumers of
electricity among others should be absolutely avoided.
— If interferences on the sensor side cannot be excluded,
suited protection devices on the system must also be
provided on the sensor side (input) of the transmitter.
— The connection cable of the sensor on the transmitter
should be disconnected when performing welding work
in the vicinity of the installed transmitter, sensor, as
well as supply lines from the sensor to the transmitter.
— This correspondingly also applies to the supply side, if
there is a connection there.
6.3.2 Conductor material
Supply voltage
— Maximum cable outer diameter: 12 mm (0.47 inch)
— Maximum wire cross-section: 2.5 mm
2
(AWG 16)
6.3.3 Cable glands
The cable diameter must be appropriate for the cable gland
used to ensure compliance with the requirements for
IP 66 / IP 67 or NEMA 4X IP rating. This must be checked
during installation.
For delivery without cable gland (threads M20 x 1.5 or
NPT 1/2"), the following points must be observed:
— Use cable glands acc. to version M20 x 1.5 or NPT 1/2".
— Observe information in data sheet / operating
instructions for cable gland used.
— Check the working temperature for the cable gland
used.
— Check the IP rating IP 66 / 67 or NEMA 4X of the cable
gland used.
— Check the ex relevant specifications for the cable gland
used acc. to manufacturer’s data sheet or Ex certificate.
— The cable gland used must be approved for the cable
diameter (IP rating).
— For tightening torque, observe information in data
sheet / operating instructions for cable gland used.
6.3.4 Shielding of the sensor connection cable
To ensure the system benefits from optimum
electromagnetic interference immunity, the individual
system components, and the connection cables in
particular, need to be shielded.
The shield must be connected to the ground reference
plane.
NOTICE
National regulations and directives must be observed
when grounding system components.
NOTICE
Damage to components!
In systems without potential equalization or with potential
differences between the individual grounding points,
multiple instances of shield grounding can result in
transient currents at mains frequency.
These can damage the shielding, influence the
measurements and have a significant impact on signal
transmission, of bus signals in particular.
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