Sheffer ELECTRONIC - Manual (Page 2)

Electronic Positioning Cylinders
1 EP-1
Dead Zone The last 2.5 inches of the transducer rod
from the end of stroke to the end of the
rod. The magnet must not be permitted to
enter the dead zone, which causes an
unpredictable output.
Hysteresis The maximum error that can be expected
when returning to a point from the oppo-
site direction.
Repeatability The ability to return to the same linear
measurement with the same direction of
travel. This is generally more important
than non-linearity for most applications.
Non-Linearity The deviation of the actual from the
theoretical position of the output signal.
For most applications the non-linearity is
considered the same as “Accuracy”.
Resolution The smallest increment of stroke that can
be detected and indicated on the output.
Null Space The distance from the transducer head face
and the start of the stroke.
Null Position The magnet position on the transducer rod
which produces a zero or minimum output
signal.
Stroke The active or sensing portion of the
transducer rod.
Analog Transducer output that yields 10-0 or 0-10 V
off two separate wires, where final voltage
output is proportional to the magnet position.
Digital Transducer output produces start/stop
signals with outputs in counts, square wave
in quadrature or parallel binary/BCD.
Terms
In MTS’ magnetostrictive sensor,
the interaction of two magnetic
fields induces a torsional strain
pulse in a waveguide. One field
emanates from a rare earth mag-
net; the other is generated by a
current pulse launched on a wire
inside the guide. Magnet position
is sensed by measuring the time
lapse between the launch of the
current pulse and the arrival of
the strain pulse.
Magnetostrictive Sensing
Performance Specifications
LDT (Linear Displacement Transducer)
Operating Voltage +13.5 to +24 Volts DC
Non-Linearity <+0.03% of full stroke or +0.05 mm
(+0.0002 inches), whichever is greater
Resolution 0.10 mm (0.004 inches) with on circu-
lation with 28 MHz counter (Digital)
infinite (Analog)
Hysteresis <0.02 mm (0.0008 inches)
Response Time (Analog) <3ms (Digital) Update 10,000
measurements per second
Measuring Range Analog (1-78 inches, US customary)
Metric 25-2000mm Digital (1-120 inches,
US customary) Metric 25-2000 mm
Operating Pressure 5,000 psi static; maximum 10,000 psi
spike Enclosure Designed to meet
NEMA 6
LRT (Linear Resistor Transducer)
Input Voltage 5-50 Volts DC
Non-Linearity 0.1% of total stroke up to 48 inches
1% of total stroke to 130 inches
Repeatability 0.001 inches
Life 500 million inches of travel
Velocity Hydraulic = 30 inches per second
Pneumatic = 50 inches per second
Output Analog, DC voltage only
Operating Pressure 5,000 psi maximum