Relays - Siemens SITRANS LUT400 Operating Instructions Manual

Connecting
5.1 Connecting SITRANS LUT400
To achieve the best performance of temperature measurement in a typical open channel
flow application, the temperature sensor should be shielded from direct sunlight and
mounted half way between the ultrasonic transducer face and the maximum head achievable
in the application. Care should be taken to not obstruct the direct sound path of the
ultrasonic transducer.
Note
Use a TS-3 Temperature Sensor only. Leave terminals open (unused) if TS-3 is not
deployed.
5.1.6

Relays

Relay contacts are shown in the de-energized position. All relays can be configured as
positive or negative logic (see 2.8.11. Relay Logic (Page 206)).
Relay Ratings
● One Form C (NO or NC) relay (relay 1), 1A at 250 V AC, non-inductive, 3A at 30 V DC.
● Two Form A (NO) relays (relays 2,3), 5A at 250 V AC, non-inductive, 3A at 30 V DC.
40
Power Failure
Relays 2, 3 are normally open.
Relay 1 can be wired either normally open or
normally closed. In the event of loss of input
power, relays will revert to their normal states.
Operating Instructions, 07/2019, A5E33329501-AC
SITRANS LUT400