KROHNE OPTITEMP TT 30 C-R EN - Manual (Page 26)

4
ELECTRICAL CONNECTIONS
26
OPTITEMP TT 30 C/R
www.krohne.com 11/2012 - 4000753302 - MA OPTITEMP TT 30 C/R R02 en
4.3.4 Rail-mount transmitter (Ex)
DANGER!
The Ex transmitter can be connected to temperature sensors installed in potentially explosive
areas of zone 0, 1 and 2. It may only be connected to Ex approved sensors or sensors that meet
the requirements for "simple equipment" in EN 60079-11:2007, section 5.7. During operations
with the input signal connected to potentially explosive areas always note the relevant safety
instructions and especially the following items:
• The transmitter must be supplied by an intrinsically safe power supply unit or Zener barrier
placed outside of the potentially explosive area.
• The output parameters of the Ex approved Zener barrier or voltage supply have to be less or
equal than the input parameters of the transmitter (i.e. U
i
, I
i
, P
i
, L
i
, C
i
).
CAUTION!
Note that the maximum output load always depends on the power supply. If the maximum output
load is exceeded, then the measured value will become incorrect. For further information refer
to the output load diagrams in the chapter "Technical data".
INFORMATION!
The transmitter has a polarity protection. Connecting the power supply with a wrong polarity will
not damage the transmitter.
Figure 4-4: Connection diagram of the rail-mount transmitter (Ex)
1 Intrinsically safe power supply (8...30 VDC)
2 Load resistance
3 Input
4 Potentially explosive area
5 Safe area
6 Female connector for PC connection cable (contained in configuration set)
7 Output signal (4...20 mA)
.book Page 26 Friday, November 9, 2012 3:50 PM