User manual - METER SWE-94-U
Figure 4.6. Terminals description
All connections must be made while power supply is disconnected !
Figure 4.7. Connection of power supply
a) for 230V AC version; b) for 24V DC version
Temperature sensor can be connected to the device in typical 3-wire circuit (Figure 4.5a) or
2-wire circuit (Figure 4.5 b). Due to precision of measurement 4-wire circuit is recommended.
If 2 wire circuit is used, the resistance of wires should be as small as possible, to
avoid of measurement errors. Measured value can be corrected (constant
correction) using „
toFS
” parameter from menu „
inPt
”. Due to low precision 2-wire
connection is not recommended.
When 2-wires connection is used, the resistance of particular wires (Ra and Rc)
CAN BE DIFFERENT
. When 3-wires connection is used, the resistance of particular wires
(Ra ÷ Rc)
MUST BE IDENTICAL
to enable proper compensation of it's resistance. The
resistance of particular wire
should not be greater than 20
Ω
.
11
FUSE
230V AC
L N
L N
1
2
a)
FUSE
+
-
24V DC
1
2
+
-
b)
!
i
9 10
GND
DATA+
DATA-
RS-485
1 2 3 4 5 6 7 8
n.c.
TC
+
-
TC
8
9
V
mA
RTD
+
+
mV
power
supply
(depending on version)
Summary of Contents for SWE-94-U
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