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Miller H Series
Hydraulic Cylinders
LRT Cylinders
Description
Transducer Performance Specifications
Miller Fluid Power Position Sensing Cylinders (PSC) with LRT linear
resistive transducers provide simple, reliable, and cost-effective position
sensing.
Resolution.......................................Infinite
Linearity ..........................................0.1% to 46 inches
1% to 120 inches
Repeatability ...................................0.001 inch minimum
Maximum Speed .............................20 inches/second
Maximum Pressure.........................3000 PSI
Temperature Range.........................-40˚F to 180˚F
300˚F Optional
Minimum Durability ........................500 million inches of stroke
(for transducer)
The LRT consists of a resistance element assembly internal to the cylinder rod with a wiper carriage installed in the piston head. As the wiper
moves with the piston, an electrical circuit is created between the upper
resistive element and the lower collector strip. Wiper voltage is directed
from the collector through wiring to an electrical connector. Position
sensing is then determined by the analog output voltage proportional to
the wiper (piston) position on the resistive element.
Note: Standard LRT design not suitable for use with Phosphate Ester or
high water content fluids.
Design Features
CYLINDER
ROD
High performance, low cost design allows for the addition of a position
sensing device to heavy duty hydraulic cylinders. Infinite resolution,
excellent linearity, resistance stability, and long life, provides increased
productivity, improved reliability, and repeatable tolerances.
TO ELECTRONIC
CONTROL
WIPER CARRIAGE ASSEMBLY
Simple analog feedback signals interface with motion controllers without
complex transducer signal conditioning, thus offering minimum start-up
time and ease of use for engineers or operators.
ELECTRICAL
CONNECTOR
PRESSURE
PORT
PISTON
LINEAR RESISTANCE
ROD ASSEMBLY
Compact transducer design is protected in the cylinder from severe environments and possible damage. Slide-off wiper carriage allows for fast
and economical cylinder seal retrofits including snap-ring replacement of
the wiper carriage in the piston, if necessary.
RESISTANCE
MATERIAL
COLLECTION STRIP
CARRIAGE
SNAP RING
Economical position sensing in a NFPA hydraulic cylinder with only an
extension of one (1) inch overall length provides for standard mounting
options in existing applications.
WIPERS
LINEAR RESISTANCE
ROD ASSEMBLY
PRESSURE
PORT
WIPER CARRIAGE ASSEMBLY
High pressure rating and solderless electrical connector are options
offered as standard features for maximum package integrity and design
flexibility. High temperature (300˚F) versions are available.
Standard Specifications
Transducer Electrical Options
Method of Position Sensing............Linear Resistive
Transducer LRT
Maximum Stroke.............................120 inches
Minimum Rod Diameter..................5⁄8 inch up to 20 inches stroke
Bore Sizes .......................................11⁄2 to 8 inches
Mounting ........................................All NFPA styles
Input Voltage Requirements............5 to +50VDC maximum
Analog Output Voltages ..................0 VDC to + 10 VDC
(with additional
-10 VDC to + 10 VDC
electronic controllers)
4 to 20 MA optional
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