Dynisco TX180, Инструкция по установке и эксплуатации

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TX180 Temperature Transmitter 9
2.2.2.4 P
IPE
M
OUNTING
A stainless steel bracket is available for pipe mounting. Use the PY-2 for mounting the XP-FN or XP-
FG housing onto any 2" pipe. Note that the XP-HEAD and WP-HEAD are not suitable for Pipe
Mounting. The housing is attached to the bracket as shown in Figure 3.
2.3 E
LECTRICAL
I
NSTALLATION
The TX180 has two groups of terminals. One terminal group is for the sensor input. The second
terminal group is for transmitter output. The terminals labeled “+” and “-” are the 4 to 20mA output
terminals. These are normally connected to the corresponding polarity terminals of the power supply
of the current loop. Refer to Figure 4 for the arrangement of the output terminal connections.
Terminals labeled “1, 2, 3 and 4” are used in various connections to accommodate the different
sensor inputs. Refer to Figure 5 for the arrangement of the input terminal connections.
2.3.1 O
UTPUT
T
ERMINALS
The output terminals, labeled “+” and “-”, are generally connected to a power supply having a
nominal 24 Volt DC voltage and capable of supplying 23mA for the TX180. The “+” and “-”
terminals of the transmitter are connected to the corresponding polarity terminals of the power
supply.
Fig. 4 Output Terminal Connections
A load resistor, typically 250 ohms, may be connected in series with either terminal of the
transmitter. For Digital communications, 250 ohms must be connected in the loop. The maximum
series resistance in the circuit (including wiring lead resistance) can be calculated using the formula:
Vs - 12
Rs = ––––––––––
0.023