KROHNE OPTITEMP TT 51 EN - Manual (Page 17)

ELECTRICAL CONNECTIONS
4
17
TT 51 SERIES
www.krohne.com 09/2010 - 4000754201 - MA TT 51 R01 en
4.3 Connection diagram of in-head transmitter (non-incendive)
DANGER!
To enable HART
® communication, the output circuit must have an output load of at least 250 Ω.
DANGER!
This transmitter is a category 3 equipment and may not be operated in areas with potentially
explosive atmospheres other than zone 2!
Figure 4-1: Connection diagram
1 Voltage supply 10…36 VDC (terminals 6, 7)
2 Modem
3 Input
4 Output
5 SmartSense temperature sensor
6 Thermocouple
7 Pt100 3-wire connection
INFORMATION!
The HART
® modem is connected parallel to the output load or parallel to the output of the
transmitter.
DANGER!
This transmitter may be operated in areas with potentially explosive atmospheres (zone 2) if the
power supply has a protection ensuring that the power supply terminals of the transmitters are
limited to transients not exceeding 140% of the rated power supply.