Tecfluid LU Series - Manual (Page 21)

21
7 HART COMMUNICATION
Level meters LU9XH y LU921H have a modem for HART communication.
LU transmitters are fully compatible with the HART Server software from HART
Communication Foundation.
Tecfluid S.A. do not guarantee that the LU transmitters are compatible with the different
servers in the market.
When connecting the transmitter, an external resistor (R ext.) should be included. Its
minimum value is 200
 and the maximum value depends on the power supply as
follows:
The detail of the characteristics with respect to the HART communication are available in
the corresponding “Field Device Specification” document.
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.
6 KEYBOARD DISABLE AND “WRITE PROTECT”.
The instrument has a jumper, placed behind the display on the left, which can be used to
avoid changes in the configuration. When the jumper is connected the instrument can be
configured by means of the keyboard and via HART. When the jumper is removed, the
keyboard is disabled and “Write Protect” is activated for HART, thus avoiding any changes
in the configuration.