Table of Contents
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Contents
Chapter 1: 953A Overview ....................................2
Chapter 2: Installing ..............................................4
2.1 Installing to a Mounting Bracket ........................4
2.2 Installing in a Hydraulic Cylinder .......................5
Chapter 3: Wiring ..................................................8
3.1 V0/V1 (Voltage) .................................................8
3.2 C4/C2 (Current) .................................................8
3.3 Setting Zero & Span Position ..........................12
Appendix A: Troubleshooting ............................13
Appendix B: Part Numbering .............................14
Appendix C: Specifications ................................15
NOTE: Ametek has checked the accuracy of this
manual at the time it was approved for printing. This
manual may not provide all possible ways of installing
and maintaining the LDT. Any errors or additional
possibilities to the installation and maintenance of the
LDT will be added in subsequent editions. Comments
for the improvement of this manual are welcome.
Ametek reserves the right to revise and redistribute
the entire contents or selected pages of this manual.
All rights to the contents of this manual are reserved
by Ametek. VMAX is a registered trademark of Gemco.
Unpacking
Carefully remove the contents of the shipping carton
and check each item on the packing slip before
destroying the packing materials. Any damage must be
reported to the shipping company. If you do not receive
all of the parts, contact Ametek at 800-635-0289 (US
and Canada) or 248-435-0700 (International).
Most probes are shipped
in a Tube. To remove the
metal end cap, use a large,
flat blade screw driver or
a metal rod and tap on the
inner edge of the cap until
it pivots. Grab the cap and
pull it out. Use caution as
the edge of the metal cap may be sharp.
If you have an RMA warranty claim, pack the probe in
a shipping tube or with stiff reinforcement to prevent
the probe from being bent in transit.
2
AUTOMATION & PROCESS TECHNOLOGIES
®
1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • Phone 248.435.0700 • Fax 248.435.8120 • www.ametekapt.com
Chapter 1: 953A Overview
The 953A VMAX is a magnetostrictive Linear
Displacement Transducer (LDT) for highly accurate
continuous machine positioning in a variety of
industrial applications.
This sensor is built to withstand the most severe
environmental conditions and is completely absolute.
This means that power loss will not cause the unit to
lose position information or require re-zeroing. The
non-contact design allows this device to be used in
highly repetitive applications without mechanical wear.
The 953A VMAX has a few truly unique features. One
feature is the LDT's auto-tuning capability, the ability to
sense a magnet other than the standard magnet and
adjust its signal strength accordingly. Another feature
is that the analog output is programmable over the
entire active stroke length. The active stroke area lies
between the Null Zone and Dead Band.
There is a diagnostic LED located at the connector
end of the probe that remains green while a good
magnet signal is present and when the magnet is in
the programmed stroke area. The LED turns yellow
when the magnet is out of the programmed active
range, but still within the active stroke area. The LED
turns RED if there is a loss of magnet and the output
will go to 0 volts on a voltage unit and 3.8mA on
current model units.
The 953A VMax LDT with a 4 to 20mA output offers a
unique diagnostic capability. The normal 4 to 20mA
output indicates the position of the magnet within the
programmed span. If the position of the magnet is
outside the set span, the output is either 3.9mA or
20.1mA. If the magnet moves into the Null or Dead
Zones or there is a loss of magnet the output will be
3.8mA. This feature is only available on units with a
current output. On voltage units the voltage output
will be 0 volts below the programmed zero point and
10volts above the programmed Span.
All units can easily be changed in the field from a
0-10VDC to a 10-0VDC or a 4-20mA to a 20-4mA.
NOTE: The part number on the LDT is a record of the
characteristics that make up your specific unit. For a
translation of the part number, see Appendix B.
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