ELECTRICAL CONNECTIONS
4
19
OPTITEMP TT 53 C/R
www.krohne.com
06/2018 - 4006523501 - MA OPTITEMP TT 53 R01 en
4.4 Connection diagram of in-head transmitter (intrinsically safe)
Figure 4-2: Connection diagram
1
Input
2
Potentially explosive area
3
Safe area
4
Modem, Ex-approved
5
HART Modem
6
R
Load
, R
≥
250
Ω
7
Zener barrier or voltage supply 8,5
…
30 VDC (intrinsically safe)
8
Output
9
See chapter "cable length"
INFORMATION!
The HART
®
modem is connected parallel to the output load or parallel to the output of the
transmitter.
DANGER!
The transmitter may be operated in areas with potentially explosive atmospheres if the voltage
supply is ensured by means of an associated apparatus.
In potentially explosive areas only Ex approved HART
®
modems may be used. The safety
instructions for operation in potentially explosive areas must be observed.
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.
