Tecfluid TH6 For AD Series - Manual (Page 5)

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The connection is made in the terminal block. The positive terminal of the power supply is
connected to the position + and the positive terminal of the load in the position -. The
negative terminals of the power supply and the load are connected together. The
instrument works in a 2-wire system, that is, the supply and signal line is the same. It is
recommended to use a twisted pair wiring or shielded cable to avoid interferences in the
current loop.
3.2 HART TM transmitters
In the case of a HART TM transmitter, an external resistor (R ext.) must be included. Its
minimum value will be 200  and the maximum value will depend on the power supply as
follows, being the power supply voltage V, 18 VDC minimum.
Before connecting the power supply, you must be sure that the supply voltage is the
correct for the installation. The power supply voltage is indicated on the label of the
transmitter.
To help in the wiring of the equipment, the description of the terminals is marked on the
printed circuit next to the terminal strip.
3.1 Power supply and analog output
In order to establish HART TM communication, it is necessary to connect a terminal or PC
with a HART TM modem, in one of the points indicated in the following figure.
12 to 36 VDC