Yokogawa 415 Steam and Gas User Manual

Page 70

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When wiring the RTD, care must be taken to ensure the (+) of the Current on
terminal 4 is connected to the same side of the RTD as the (+) of the signal on
terminal 5. The RTD has no polarity and can be connected in either direction.

4-20mA Inputs

Each 4-20mA has a 250 ohm input connected to the signal ground as shown
below. When the instrument is AC powered, there is sufficient current from the
DC output to power up to three current loops. If more loops are to be powered,
an external DC power source is required.

Powering from the Internal DC Supply

When using only one 4-20mA flow input, the signal must be connected to
terminal 3 as shown above

Shielding:

When shielding the input signals, the shield should be connected to
the case earth and not connected at the transmitter end (ie. ground
at one end only).

68 Input Circuits

MODEL 415

7

12

Set Supply to 24V out

P

+

-

3

11

P

+

-

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