Connecting
5.1 Connecting SITRANS LUT400
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
39
Note
The SITRANS LUT400 supports several different transducers. Some, like the XPS
-30, are
driven by a low power level, while others, like the XPS
-15, are driven by a high power level.
It may be possible to damage a lower power
transducer like the XPS-30 if the transducer
selection is currently set to one of the high power transducers. Follow the steps below to
avoid this possibility:
1. Set the transducer selection to No Transducer before powering down t
he LUT400.
2. Connect the new transducer.
3. Power up the LUT400 and select the correct transducer. This way, the transducer will not
be driven with the wrong power level, even for the short period of time until the correct
selection is made.
5.1.5 Temperature sensor
The speed of sound changes as temperature changes. To ensure accurate level
measurement, the SITRANS LUT400 compensates via an external temperature input. All
Siemens EchoMax transducers have an internal temperature sensor for this purpose, and for
the fastest temperature response, Siemens also offers a dedicated temperature sensor, the
TS-3.
If the following conditions apply, a separate TS-3 temperature sensor will ensure optimum
accuracy:
● The transducer is exposed to direct sunlight (or other radiant heat source).
● The temperature of the atmosphere between the transducer face and monitored surface
differs from the temperature of the transducer.
● Faster response to temperature changes is required.
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