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Installation Manual
Toll Free: 800-635-0289 • Email: [email protected] • Web: www.ametekfactoryautomation.com
Chapter 1: 958A Overview
We know today’s industrial challenges are extreme, so we designed and built a sensor to meet and exceed
these demands, regardless of the application or environment. Innovation, proprietary technology and decades of
experience were the key to the development of our 958A Embedded Linear Displacement Transducer.
The 958A was designed with the mobile hydraulics market in mind. The 958A is a rugged, accurate, programmable
zero & span, auto-tuning, non-contact linear displacement transducer in a compact embedded rod-style package.
The embedded package style allows the unit to be totally installed inside of a hydraulic cylinder, thus protecting the
transducers from outside conditions. The transducer utilizes our field-proven Magnetostrictive technology to give
absolute analog position, accurate to 0.04% of the programmable sensing distance. A variety of different analog
outputs are available to meet your needs.
The 958 has a variety of truly unique features. The first one is the wide power range of 8 to 30 VDC @ 1.6 watts.
The LDT also has auto-tuning capability, the ability to sense a magnet other than the standard ring magnet and
adjust its signal strength accordingly. Our units offer a variety of different analog outputs, all with optional field
programmable Zero & Span points. Units can be ordered in English or metric span lengths from 2" to 100" (50mm
to 2540mm), and come standard with either integral cable assemblies, bare leads or M12 style connectors.
The 958A units offers a unique diagnostic capability. When the magnet is present and within the programmed
range the unit will output a voltage or current within its selected range (depending on location of magnet). If the
magnet moves beyond the programmed ranges the output will indicate this with a voltage or current outside of the
selected range.
Voltage Output
Specified at time of order (i.e. in Part Number)
V0
Range
0 to +10VDC
Resolution
16 bits (0.0015% of span)
Fault Condition Loss of Magnet 10.2V, below or above
programmed range -0.1V or 10.1V
V1
Range
+10 to 0VDC
Resolution
16 bits (0.0015% of span)
Fault Condition Loss of Magnet 10.2V, below or above
programmed range 10.1V or -0.1V
V2
Range
0 to +5VDC
Resolution
15 bits (0.0031% of span)
Fault
Condition
Loss of Magnet 5.2V, below or above
programmed range -0.1V or 5.1V
V3
Range
+5 to 0VDC
Resolution
15 bits (0.0031% of span)
Fault Condition Loss of Magnet 5.2V, below or above
programmed range 5.1V or -0.1V
V4
Range
0.25 to +4.75VDC
Resolution
~15 bits (0.0034% of span) (14.85 bits)
Fault Condition Loss of Magnet 5.2V, below or above
programmed range -0.1V or 5.1V
V5
Range
+4.75 to 0.25VDC
Resolution
~15 bits (0.0034% of span) (14.85 bits)
Fault Condition
Loss of Magnet 5.2V, below or above
programmed range 5.1V or -0.1V
V6
Range
0.5 to +4.5VDC
Resolution
~15 bits (0.0034% of span) (14.68 bits)
Fault Condition
Loss of Magnet 5.2V, below or above
programmed range -0.1V or 5.1V
V7
Range
+4.5 to 0.5VDC
Resolution
~15 bits (0.0034% of span) (14.68 bits)
Fault Condition
Loss of Magnet 5.2V, below or above
programmed range 5.1V or -0.1V
Curent Output
Specified at time of order (i.e. in Part Number)
C2
Range
20 to 4mA
Resolution
15.7 bits, calibrated for 3.5-21mA (0 -
21mA, 16 bits )
Fault Condition
Loss of Magnet 3.8mA, below or above
programmed range 20.1mA or 3.9mA
C4
Range
4 to 20mA
Resolution
15.7 bits, calibrated for 3.5-21mA
(0 - 21mA, 16 bits )
Fault Condition
Loss of Magnet 3.8mA, below or above
programmed range 3.9mA or 20.1mA
All units can easily be changed in the field for reverse operation. See section 3.4 Setting Zero & Span Positions.
