wtw LF 170 - Outputs and Interfaces; Overview; Freely Configurable Relay (RT and RT RS Option)

Overview LF 170
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ba54104d09 11/2010
1.2 Outputs and interfaces
1.2.1 Overview
The monitor has the following outputs and interfaces depending on the
instrument version:
1.2.2 Freely configurable relay (RT and RT RS option)
Both potential-free K1 and K2 relays of the RT and RT RS instrument
versions can be used as follows:
z As a fault indicator if the power fails
z As an indicator relay for a frozen measured value (e.g. when
calibrating)
z As a threshold indicator if a specified threshold is undercut or
exceeded (main measured value)
z As a control relay with timer function, e.g. for time-controlled sensor
cleaning operated by compressed air.
Instrument version Relays Current outputs Digital
interfaces
LF 170 (standard) 1 x analog output for
measured conductivity
value
-
LF 170 RT 2 x freely configurable
relays
1 additional analog output
for the measured
temperature value
-
LF 170 RT RS as RT option as RT option 1 x RS 485