AMETEK 1986XPJ Explosion Proof Resolver - Manual (Page 13)

13 1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax 248.435.8120 • www.ametekapt.com
AUTOMATION & PROCESS
TECHNOLOGIES
950MD
The series 950 Mill-Duty Housing (950MD) was
designed for applications where mounting a stand-
alone rod style linear displacement transducer
(LDT) is prohibitive. Potential physical damage,
environmental conditions or mounting limitations
are all elements that are involved in specifying a
linear position feedback system that will perform
flawlessly for many years to come. The 950MD
housing has been designed to eliminate all of the
above problems by protecting the LDT from physical
and environmental damage such as temperature,
corrosives, shock & vibration, or dust and debris.
Additionally, the 950MD offers a simple two point
mounting scheme that can compensate for lateral
and/or horizontal movement of the machine while in
operation. Mounting bolts are provided for both the
trunnion mount and rod ends in either standard steel
or optional Stainless Steel when specified.
The 950MD housing is also perfect for retrofitting
existing cylinders with an LDT providing a
continuous position feedback signal. The 950MD
allows for a convenient way to mount the 950MD
and internal LDT parallel to the cylinder. This
eliminates the need to tear down and gun drill
the cylinder to accommodate an LDT simply for
providing position feedback that had not previously
been available.
The housing may also be of benefit in this same
configuration when you have an existing cylinder in
operation that does not allow for an easy removal
of the LDT. Old machines and even some existing
machines or newly designed machines did not take
into consideration the need for continuous position
feedback. Certain machines may require that the
entire cylinder be removed in order to replace the LDT.
The actuator contains a 1/2” spherical rod end with
approximately 1” of adjustment (length). This
spherical rod end allows mechanical movement in
a horizontal and/or vertical motion to compensate
for any mechanical slop or misalignment between
the housing and machine. A rear trunnion mount
is provided for mounting either directly in front of
the head assembly or on the rear of the head. An
optional 3/4” spherical rod end can be supplied on
the rear of the unit (see drawing for details).
The back cap is supplied with threaded and plugged
holes that allow for field installation of the 3/4”
diameter trunnion mount bracket to the back cap.
The trunnion mount bracket is positioned at the
point where the head and barrel connect. A simple
exchange of hardware is all that is necessary to
move the trunnion mount bracket to the back cap
and plug the no longer required bracket mounting
holes. When ordering the 3/4” rear rod end option,
the trunnion mount bracket is not supplied since it
would not be required.
The actuator rod is supported by two bearings within
the guide tube. The front piston bearing contains a
wiper assembly to keep contaminants from entering
the guide tube. The rear, or movable, bearing
assembly is manufactured from Rulon®. This high-
temperature polymer material provides low wear
and smooth operation.
The transducer magnet is mounted within the rear
bearing assembly. The magnet is a 1” O.D. cylinder
magnet (SD0410300). The magnet is positioned
2” from the end of the transducer hex when the
actuator is fully retracted and 5” from the end of
the transducer guide tube when the actuator is fully
extended.
The 950MD is designed to incorporate an LDT which
has a minimum 2” Null Zone and 5” Dead Band.
Series 950MD Mill-Duty Housing