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89
5
INSTALLATION…
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5.7.2
3-lead Resistance
Thermometer (RTD) Inputs
The three leads must have equal resistance, not
exceeding 50
Ω
each.
5.7.3
2-lead Resistance
Thermometer (RTD) Inputs
If long leads are necessary it is preferable to use a
3-lead RTD. If the RTD is to be used in a hazardous
area, a 3-lead RTD connected via a suitable Zener
barrier, must be used.
5.8
Output Connections
Make connections as shown in Fig 5.7.
Refer to rear fold-out/ Table B – Output
Sources for the default output assignment
settings.
5.9
Power Supply Connections
Warning.
•
A 1A fuse must be fitted in the live (+ve) supply line.
•
The ground line must be connected to the
ground stud and not to terminal 18 on the
terminal block – see Fig. 5.7.
Do not disturb the link between' terminal 18
and the ground stud.
•
The type of power supply required (a.c. or d.c.)
is stated at the time of order and can be
identified from the instrument code number:
C50X/XX0X/STD = 85 to 265V a.c.
C50X/XX1X/STD = 24V d.c.
Table 5.1 Thermocouple Compensating Cable
Содержание C505
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