Siemens sitrans LG200 Manual Del Usuario página 7

General probe mounting
1. Ensure the process connection is at least ¾" NPT for coaxial probes or 2" NPT for rigid
probes or is a flanged mounting.
2. Carefully place the probe into the vessel. Align the gasket on flanged installations.
3. Align the probe process connection with the threaded or flanged mounting on the vessel.
4. For threaded connections, tighten the hex nut of the probe process connection. For
flanged connections, tighten flange bolts.
Installation in non-metallic silos
For installation in vessels of a non-metallic construction or possibly open vessels, a
suitable launch plate is required to optimize the impedance of the transmitted signal as it
travels along the probe. Optimal performance cannot be guaranteed if a suitable
transition is not available at the process connection.
When using single rod versions (flexible
or solid) and a threaded process
connection, a metal sheet or flange will
greatly improve conditions as this
provides a suitable launch plate.
A flanged process connection is
generally accepted to be provision of
this launch plate.
The SITRANS LG200 meets CE requirements for Electromagnetic Compatibility
Note:
(EN 61326-1/2006). Single and Twin Rod probes must be used in metallic vessel or stilling
well to maintain CE compliance.
Transmitter (enclosure) installation
1. Remove the protective plastic cap from the top of the probe. Put the cap in a safe place in
case the transmitter has to be removed later.
2. Place the transmitter on the probe. Be careful not to bend or dirty the gold, high
frequency (male) connector.
3. Align the universal connection at the base of the transmitter housing with the top of the
probe. Hand tighten the connection.
4. Rotate the transmitter to face the most convenient direction for wiring, configuration, and
viewing.
5. When the transmitter is facing the desired direction, use a 38 mm (1½") wrench to tighten
the universal connection on the transmitter to 15 ft-lbs. A torque wrench is highly
recommended. This is a critical connection. DO NOT LEAVE HAND TIGHT.
Wiring
Power
WARNINGS:
All HART versions of SITRANS LG200 transmitter operate at voltages of 11 to
36 V DC. Higher voltage will damage the transmitter.
7ML19985XG81 SITRANS LG200 – QUICK START MANUAL
silo roof
(plastic
or wood)
metal sheet or
metal flange
Page EN-5