Installing A Remote Head Lwt Instrument - ABB LWT300 Series User Manual

Installing a remote head LWT instrument

Certain process conditions (especially high temperatures) warrant the use of a remote head on the
LWT300 instrument. Remote head instruments are also very useful for any reason where you might
prefer or need to distance the head from the coupler (ease of access, floating roofs, etc.)
There are three main steps to installing a remote head instrument:
1 Installing the probe-coupler assembly in the vessel (see "Assembling a segmented probe" on
page 17 and/or "Attaching a probe to the coupler" on page 19)
2 Installing the head on a support bracket in a remote location
3 Connecting the probe-coupler assembly to the instrument head with the proper coaxial
communication cable.
The following pages explain the last two steps.
The support bracket provided with your instrument is designed to be fixed on a pipe. It comes with an
adapter that links the instrument head and coupler.
NOTICE
The sensor head must not be installed up side down. The instrument "neck" should always
be lower than the HMI.
To install the remote head instrument:
1 Locate a NPS 2-sized pipe strong enough to support the weight of the instrument head.
2 Position the support bracket on the pipe and use the provided U-bolt, nuts and washers to fix it (see
Figure 14).
—
Figure 14 Positioning the support bracket
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User Guide
Head-coupler
adapter