wtw LF 170, Руководство по эксплуатации

Страница: 35 / 68

LF 170 Operation
101 ba54104e09 11/2010
4.6 Freely configurable relays (RT and RT RS option)
4.6.1 Configuration
Relay functions The two potential-free relays of the RT and RT RS instrument variants
can be freely configured.
The following functions are possible:
Note
The relay functions are selected in the configuration level under the
setting
Crc
(see section 4.4.2).
Function Description
nF
(no function) Relay has no function
PS
(Power Supply) Monitoring the mains voltage.
The relay contact is closed when mains
voltage is applied and opens if there is a
power failure.
FrC
(Freeze) The relay is active when the measured
value is frozen, e.g. during a calibration.
The relays can be configured as normally
closed or normally open.
UL
.
LL
(Limits)
UL
/ Sal
LL
/ Sal
UL
°C
LL
°C
The relay can be set as an upper or lower
limit indicator for both the conductivity/
salinity value as well as for the measured
temperature value. It becomes active if a
specified limit is exceeded or undercut. The
relays can be configured as normally closed
or normally open.
A limit indicator is set as follows:
– Press <ENTER> .
– Select the desired option with
<UP><DOWN> and then press
<ENTER> . Note what appears on the
display:
UL
= upper limit
LL
= lower limit
/ Sal = conductivity or salinity
°C = measured temperature value
The specification of the limits and other
parameterization of the relay is described in
section 4.6.2.