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15
HART TRANSMITTERS
The TH6H transmitters have a modem for HART communication.
TH6H transmitters are fully compatible with the HART Server software from HART
Communication Foundation.
Tecfluid S.A. do not guarantee that the TH6H transmitter is compatible with the different
servers on the market.
When connecting the transmitter, an external resistor (R ext.) should be included. Its
minimum value needs to be 200 Ω, and the maximum value depends on the power supply
as follows:
In this case the power supply voltage needs to be 18 VDC minimum.
In order to establish HART communication, it is necessary to connect a terminal or PC with a
HART modem, in one of the points indicated in the following figure.
Possible points of connection of a HART
terminal or a PC with a HART modem
18 to 36 VDC
15.1
Additional functions with HART communication
By means of the implemented commands, the user can obtain the following information:
•
Flow rate value in the scale units
•
Totalizer value (even if the equipment does not have a display).
•
Reset or writing of a totalizer value.
•
Change of beginning and end of scale of the current loop.
•
Possibility of writing tags and messages into the instrument.
15.2
HART communication characteristics
The detail of the characteristics with respect to the HART communication are available in the
corresponding "Field Device Specification" document.
22
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