Instruction Manual

3
1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax [phone] • www.AMETEKAPT.com
Overview
The Series 955D BRIK with Digital Output is an
accurate, auto-tuning, non-contact, Linear Displacement
Transducer in an economical, low profi le package. The
transducer utilizes our fi eld proven magnetostrictive
technology to give absolute position, repeatable to .006%
of the sensing distance. The streamlined anodized
aluminum extrusion houses the sensing element and
electronics. The magnet moves over the sensing
element that determines the position and converts it to a
digital output.
Features
The 955D has a truly unique feature. This LDT has auto-
tuning capability, the ability to sense a magnet other than
the standard slide magnet and adjust its signal strength
accordingly.
There is an indicator LED that is located at the connector
end of the probe and provides visual status information
regarding the operation of the probe. Green indicates
proper or normal operation. Red indicates the loss of the
magnetic signal or a probe failure. The LED turns Yellow
if no interrogation signal detected. When the probe is
in the normal mode of operation, the LED with remain
illuminated continuously.
LED Colors
Green Magnet is present and within the active range.
Red Fault, the LDT has lost its signal from the magnet or the
magnet has moved into the Null Zone or Dead Band.
Yellow No external interrogation pulse detected.
Note: The series number on your LDT is a record of all
the specifi c characteristics that make up your unit. This
includes what interface type it is, its output signal and
range, the type of connector the unit uses, and stroke
length. For a translation of the model number, see
Section 3.7 Catalog Numbering System.
The 955D BRIK with Digital Output is a Linear
Displacement Transducer. It provides a Control Pulse,
Start/Stop or Variable Pulse output signal that is
proportional to the position of the slide magnet assembly
along the length of the probe.
Chapter 1 Hardware Overview
2.1 Mounting Instructions
The Series 955D can be mounted vertically or
horizontally using SD0522000 mounting brackets. The
mounting brackets slide in the grooves on the lower part
of the extrusion and clamp down when tightened. It is
recommended to use one mounting bracket on each end
and every three feet in between.
Ferro-magnetic material, (material readily magnetized)
should be placed no closer than .25” from the sensing
surface of the LDT.
2.2 Mounting the Magnet Assembly
Before mounting the magnet assembly, you should
consider the following
• Ferromagnetic material should not be placed closer
than 0.25” from the LDT’s sensing surface. Failure
to do so could cause erratic operation. Non-ferrous
materials, such as brass, copper, aluminum,
nonmagnetic stainless steel or plastics, can be
in direct contact with the magnet assembly and
sensing surface without producing any adverse
results.
• Make sure that the magnet is located within
the LDT’s active stroke area. Captive magnet
assemblies should be positioned so that they can
move freely over the entire area of the active stroke
without binding or pushing on the extrusion. Non-
captive magnet assemblies should be situated so
that the magnet is no further than 3/8” from the
sensing surface at any point in the fl oating magnet
assembly’s movement.
• When using the Floating Magnet assembly
(SD0522100), the magnet should be installed within
3/8” of the sensing surface. The magnet assembly
should also be installed in such a manner that
it remains an even distance from the aluminum
extrusion throughout the entire stroke. Improperly
installed magnets can result in output signal non-
linearity.
Chapter 2 Installing the LDT