Installing The Lwt; Safety First; Before You Start - ABB LWT300 series User Manual

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C h a p t E R 3

Installing the LWT

The following pages explain how to proceed with a typical physical installation of your LWT instrument.
Keep in mind that there are numerous possible installation scenarios; this documentation cannot cover
them all. However, all efforts have been made to properly indicate the main challenges associated with
such an installation.

Safety first!

WARNING
For personnel and system safety, and to ensure optimum performance, make sure that
you thoroughly understand the content of this guide, and especially the Safety chapter
(see page 1), before installing, using and maintaining the instrument.
Carefully plan any installation, modification or repair before actually proceeding.

Before you start

In preparation for the installation of your LWT instrument, and taking into account that you cannot
always decide the location of this installation, you should try and follow the recommendations below:
• Install the LWT instrument as far as possible from the product fill stream.
• Install the assembled LWT system (probe/coupler/head assembly) (see page 19) as far as
possible from the fill/drain stream.
• When inserting probes, avoid internal obstructions such as tubing, ladders, agitators, etc.
• To prevent excessive probe movement in an agitated process, or where installation close to the
vessel wall is required, secure the bottom end of a probe to the vessel. Probes installed from the top
of the vessel may require the use of a stilling well.
• Weighted cable probes should be allowed to hang inside the vessel under the tension of the weights.
NOTICE
You may need to shorten the probe. Your instrument was delivered with a probe length
set at the time of purchase. This probe length is programmed into the instrument.
Should you have to shorten the probe, do not forget to change the probe length
programmed in the instrument (see "Changing the probe length" on page 45).
• Threaded connections should be installed with thread sealant approved for use by the customer.
• Flanged connections should be made using materials (bolts, studs, nuts and gaskets) and
procedures (torque specifications) approved for use by the costumer.