R30A – AC Operated, Light Weight RVDT
R30A Rev. 8 www.meas-spec.com 2015-November
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AC operation
±60 degree angular sensing range
Light weight
Non-contact electrical design
Wide operating temperature range
Size 11 servo mount
Anodized aluminum housing
DESCRIPTION
The R30A RVDT (Rotary Variable Differential Transformer) is an angular position sensor that incorporates a
proprietary non-contact design which dramatically improves long term reliability when compared to other
traditional rotary devices such as synchros, resolvers and potentiometers. This unique design eliminates
assemblies that degrade over time such as slip rings, rotor windings, contact brushes and wipers, without
sacrificing accuracy.
High reliability and performance are achieved through the use of a specially shaped rotor and wound coil that
together simulates the linear displacement of a Linear Variable Differential Transformer (LVDT). Rotational
movement of the rotor shaft results in a linear change in the amplitude of the output signal, directly proportional
to the shaft angle change, while the phase of this output signal indicates the direction of displacement from the
null point. Non-contact electromagnetic coupling of the rotor provides infinite resolution thus enabling absolute
measurements to a fraction of a degree.
AC operation eliminates the need for integrated signal conditioning components, thereby offering the user an
extremely wide operating temperature range of -55°C to +150°C. Factory calibrated to operate over a ±30
degree range, the R30A offers a non-linearity of less than ±0.25% of full range. Extended range operation up to
a maximum of ±60 degrees is possible with increased non-linearity. Packaged in a small, size 11 servo mount,
aluminum housing with flying lead termination, the R30A is ideal for space restrictive applications.
Also see our other angular position sensor models, R36AS (stainless steel housing, MS style connector), RSYN
(high output, shock and vibration tolerant), R30D and R60D (bipolar DC operation), and the RVIT-15 Series
(single ended DC operation, voltage or current output).
Measurement Specialties offers many other types of sensors and signal conditioners. Data sheets can be
downloaded from our web site at: http://www.meas-spec.com/datasheets.aspx
Measurement Specialties, Inc. acquired Schaevitz Sensors and the SchaevitzTM trademark in 2000.
FEATURES APPLICATIONS
High accuracy
Valve position
Infinite resolution
Machine tool equipment
Long term reliability
Rotary actuator feedback
Wide -55º to +150ºC operating temp range
Dancer arm position
Rugged anodized aluminum housing
Process control
Shielded ABEC 3 precision bearings
R30A – AC Operated, Light Weight RVDT
R30A Rev. 8 www.meas-spec.com 2015-November
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PERFORMANCE SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
Parameter
@10kHz Input Frequency (recommended)
@2.5kHz Input Frequency
Angular range, degrees
±30º
±40º
±60º
±30º
±40º
±60º
Non-linearity, % of FR
±0.25%
±1%
±2%
±0.25%
±1%
±2%
Output at range ends (*)
87mV/V
116mV/V
174mV/V
69 mV/V
92 mV/V
138 mV/V
Sensitivity
2.9 mV/V/degree
2.3 mV/V/degree
Temp coefficient of sensitivity
0.02%/ºF [0.036%/ºC], 20 to +160ºF [-7 to +71ºC]
Not specified
Input / Output impedances
370Ω / 1300Ω
135Ω / 600Ω
Phase shift
+3º
+35º
Input voltage and frequency
3 VRMS @ 2.5 to 10 kHz (10kHz recommended)
Null voltage
0.5% of FRO, maximum
ENVIRONMENTAL AND MECHANICAL SPECIFICATIONS
Operating temperature
-67°F to +300°F [-55°C to 150°C]
Mechanical angular range
360 degrees (no stops)
Bearings
Shielded ABEC 3 precision
Shaft diameter
3/16 inch [4.76 mm]
Housing material
Aluminum, anodized
Mounting
Size 11 servo mount per BU-ORD
Moment of inertia
0.53 x 10-6 inch.lb-force.second2 [0.61 x 10-6 Kg-force.cm.second2]
Maximum torque, unbalance
0.004 inch.ounce-force [0.3 gram-force.cm]
Maximum torque, friction
0.015 inch.ounce-force [1.1 gram-force.cm]
Shaft load capability
10 lb [4.5Kg] Axial; 8 lb [3.6 Kg] Radial
Electrical connection
6 lead wires, AWG 28, PTFE insulation, 12 inches [30cm] long
Weight
1.3 oz [36 Grams]
IEC 60529 rating
IP60
Notes:
All values are nominal unless otherwise noted
(*): Unit for output at range ends is millivolt per volt of excitation (input voltage)
FR (Full Range) is the angular range, end to end; 2xAº for ±Aº angular range
FRO (Full Range Output): Algebraic difference in outputs measured at the ends of the range
DIMENSIONS
Dimensions are in inch (mm)
R30A – AC Operated, Light Weight RVDT
R30A Rev. 8 www.meas-spec.com 2015-November
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WIRING INFORMATION
Connect Green to Blue for differential output
ORDERING INFORMATION
Description
Model
Part Number
RVDT ±30º, 10KHz calibration (standard)
R30A
02560231-000
OPTIONS
RVDT ±40º, 10KHz calibration
02560231-140
RVDT ±60º, 10KHz calibration
02560231-160
RVDT with 2.5KHz calibration
02560231-2XX
ACCESSORIES
R-FLEX multipurpose coupling kit
66530072-000
Refer to our “RVDT and RVIT Accessories” data sheet for other accessories.
TECHNICAL CONTACT INFORMATION
NORTH AMERICA
EUROPE
ASIA
Measurement Specialties, Inc.
1000 Lucas Way
Hampton, VA 23666
United States
Phone: +1-800-745-8008
Fax: +1-757-766-4297
Email: sales@meas-spec.com
Web: www.meas-spec.com
MEAS Deutschland GmbH
Hauert 13
D-44227 Dortmund
Germany
Phone: +49-(0)231-9740-0
Fax: +49-(0)231-9740-20
Email: info.de@meas-spec.com
Web: www.meas-spec.com
Measurement Specialties China Ltd.
No. 26, Langshan Road
High-tech Park (North)
Nanshan District, Shenzhen 518057
China
Phone: +86-755-33305088
Fax: +86-755-33305099
Email: info.cn@meas-spec.com
Web: www.meas-spec.com
The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsibility is assumed for
inaccuracies. Furthermore, this information does not convey to the purchaser of such devices any license under the patent rights to the
manufacturer. Measurement Specialties, Inc. reserves the right to make changes without further notice to any product herein. Measurement
Specialties, Inc. makes no warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does
Measurement Specialties, Inc. assume any liability arising out of the application or use of any product or circuit and specifically disclaims
any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do vary in different
applications. All operating parameters must be validated for each customer application by customer’s technical experts. Measurement
Specialties, Inc. does not convey any license under its patent rights nor the rights of others.
