Uni-Probe LB 490
BERTHOLD TECHNOLOGIES GmbH & Co. KG
2 – 131
Volume 2 1 System Description
2
Housing Material stainless steel 1.4301
Cover with screw thread metric 165 x 2mm, wrench size M32
4 conduits with NPT 3/4 inch for process connection. Unused con-
duits must be closed by a dummy plug which is suited for the
respective type of protection, see chapter "5.3 Dummy Plug" on
page 2–249.
Weight see Volume 2, chapter 6
Current output The permissible impedance range is between 120 and 500Ohm. For
safe HART
®
communication you need at least 250Ohm.
The max. cable length of the HART
®
loop depends on the con-
nected impedance as well as on the capacity and inductivity of the
cable.
Max. cable length with Berthold cable # 32024:
– 3300m at 120Ohm
– 1600m at 250Ohm
– 800m at 500Ohm
The current output itself is monitored continuously and, in case of
malfunction, signals 24mA constantly via a redundant current
path. The digital HART
®
communication remains in effect even on
the redundant current path.
Power supply Nominal voltage (depending on version):
95V to 240V
AC
50/60Hz <15VA or
18-32V
DC
and 24V
AC
+10% /-15% 50/60Hz <15VA
Fuses For the power supply units 95V to 240V
AC
and 24V
AC/DC
you may
only use fuses 1.25A / 250V
AC
slow-blow (two each) with UL
approval!
Berthold part #46719.
Multi-detector operation Up to 8 detectors can be linked with each other to extend the mea-
suring range. Thus, the maximum sensitive detector length can be
extended up to 16m.
The detectors are linked via RS-485 connection. In addition to the
measurement signal, all detectors connected may send error mes-
sages via the RS-485 connection to the Main Unit.
Relay 4 relay SPDT (change-over contact),
maximum contact loading capacity:
250V
AC
/ 5A or 24V
DC
5A non-inductive
Voltages larger than 150V must be grounded.
Relay contacts are not protected by fuses.
Relay 1: Error messages
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