Siemens Sitrans Mounting Instructions, Protection for solid-state switch, Process Cautions

Mounting Instructions

The SITRANS LC 500 is easily installed: simply mount the instrument on the process connection of the vessel.

Notes:

•The transmitter is specified for use at temperatures ranging from –40 °C to 85 °C (–40 oF to 185 oF): if your process temperature is outside this range, a standard option is available with a thermal isolator.

•Before mounting the SITRANS LC 500, check to ensure the threads are matching to avoid damaging them.

Protection for solid-state switch

•for dc circuits: connect protection diodes in the correct polarity across the relay coil

•for ac circuits: connect a Voltage Dependent Resistor (VDR) or other ac compatible component (such as zeners and protection diodes in combination) in the correct polarity across the relay coil

Process Cautions

CAUTION: Consider material surface configuration when installing unit.

CAUTIONS:

•With a centrally mounted cable version, take care that the tensile load does not exceed probe or vessel rating

•With a cable version mounted close to the tank wall, take care that the product does not push the cable against the tank wall: a spring can be used as a retainer.

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500mm

(20”) min.

7ML19985GE01 SITRANS LC 500 – INSTRUCTION MANUAL Page 21

Installation