BERTHOLD TECHNOLOGIES Uni-Probe LB 490, User Manual

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3 Electrical Installation Volume 2
Terminal Description
Terminals Description
2 - 3 Power supply: 95V to 250V
AC
or 24V
AC/DC
, depending on version
11 - 13 Relay 1: Error relay: signals an error message.
21 - 23 Relay 2: The following functions are selectable: Min/Max; HOLD;detector temperature;
radiation interference
31 - 33 Relay 3: The following functions are selectable: Min/Max; HOLD; detector temperature;
radiation interference
41 - 43 Relay 4: The following functions are selectable: Min/Max; HOLD; detector temperature;
radiation interference
51 - 52 HART
®
loop: 4–20mA current output with HART
®
interface for result output and parameter
setting. This current output is used for the continuous transfer of the level measured value and
for display of the error status via the adjustable fault current:
– 4–20mA for current measured value.
– Adjustable fault current from 3.5 to 24mA in case of error.
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.
– Output current adjusted via software.
– The current output can be operated in the Sink or in the Source mode.
– The permissible impedance range is between 120 and 500Ohm. For safe HART
®
communi-
cation you need an impedance of at least 250 to maximum 500Ohm.
– The max. cable length of the HART
®
loop depends on the connected 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
We recommend using a screened cable, The BERTHOLD TECHNOLOGIES cable #32024 is
shielded.
53 - 54 Not used
55 - 56 Not used
57 - 60 RS-485 for multi-detector mode. Connection for Auxiliary Unit.
61 - 62 Digital input 2: external empty adjustment (starting with software version 1.20).
63 - 64 Digital input 1: HOLD function.
65 - 66 Not used
67 - 69 Not used
RS -232 interface For servicing and software updates: The software can be updated via the RS-232 interface
using the program Uni-Loader.