Excell Precision SP151 User Manual
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© Excell Precision Limited 2012. All rights reserved Worldwide.
The information contained herein is the property of Excell Precision Limited
and is supplied without liability for errors or omissions. No part may be
reproduced or used except as authorised by contract or other written
permission. The copyright and the foregoing restriction on reproduction
and use extend to all media in which the information may be embodied.
EXCELL PRECISI
ON CO., LTD
SP151 Weighing System Surge Protector
The high performance surge protector device applies to 4- or 6-wire load cell
weighing systems or other related applications.
1. General
SP151 Surge Protector is designed for accessing direct into the cabling of the weighing
system, in order to prevent the load cells and other sensitive electronic components from
damage by a near surge strike or power failure. Surge protector works at the local only,
therefore, SP151 devices should be installed on both ends of circuitry loop.
A complete system protection requires additional surge protection device(s) to ensure
that other items, such as AC power, external printers, mainframes, and telephone and so
on.
2. Installation
The following recommendation is only as a reference. Take into account of local conditions,
the installation should always be carried out by professionals.
2.1 Siting
SP151 should be set within 3m from the load cells or systems to be protected. For the
maximum degree of protection, SP151 should be used at both ends concurrently of the
interconnected cables. In general, install a protective device between the junction box and
load cells set (Figure 1). Some systems specify load cell individual cable(s), protections are
needed for every load cell (Figure 2). Within the weighbridge, the SP151 should be set
close to the indication systems, the interconnecting cables must be separated by at
least 50mm from other irrelevant cables.
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