4
ELECTRICAL CONNECTIONS
16
OPTITEMP TT 53 C/R
www.krohne.com
06/2018 - 4006523501 - MA OPTITEMP TT 53 R01 en
4.1 Safety instructions
DANGER!
All work on the electrical connections may only be carried out with the power disconnected. Take
note of the voltage data on the nameplate!
DANGER!
Observe the national regulations for electrical installations!
DANGER!
The transmitter is protected against polarity reversal. No damage will occur to the device if the
polarity of the supply voltage is switched. The output will then indicate 0 mA.
DANGER!
In potentially explosive areas, the intrinsically safe versions must be used.
The TT 53 C Ex / TT 53 R Ex (intrinsically safe) can be installed in potentially hazardous area zone
0, 1 and 2.
The TT 53 C Ex / TT 53 R Ex (intrinsically safe) can be installed in potentially hazardous area zone
1 and 2 and the input may be connected to temperature sensors installed in zone 0.
The intrinsically safe versions must be supplied by an intrinsically safe power supply unit or
Zener barrier placed outside of the potentially explosive area.
DANGER!
The transmitter may be operated in areas with potentially explosive atmospheres if the voltage
supply is ensured by means of an associated apparatus.
The safety instructions for operation in potentially explosive areas must be observed.
In potentially explosive areas only Ex approved HART
®
modems must be used.
In order to ensure reliable HART
®
communication with this transmitter, the maximum cable
length of the output circuit must be observed. For detailed information refer to Cable length on
page 22.
WARNING!
Observe without fail the local occupational health and safety regulations. Any work done on the
electrical components of the measuring device may only be carried out by properly trained
specialists.
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
Check for the correct supply voltage printed on the nameplate(Applies only to the intrinsically
safe versions.)
DANGER!
For the transmitters used in hazardous areas following special conditions have to be considered:
The communication interface (USB connection) may only be connected to the associated TT-CON
interface if the temperature transmitter is outside of the hazardous area. If certified TT-CON Ex
interface is used, a connected sensor may be located in the hazardous area. If non-Ex TT-CON
interface is used, a connected sensor shall not be located in the hazardous area.
For the permitted ambient temperature range, refer to Temperature data for areas with
potentially explosive atmospheres on page 47
The transmitter shall be mounted into a suitable enclosure that provides a degree of protection
of at least IP20.
