Kaman GMS-750RS User Manual
GMS-750RS Gap Measuring System
User’s Manual
Copyright © 2013 Kaman Precision Products
PART NO: 860527-001 A Division of Kaman Aerospace Corporation
Last Revised: 8/23/2013 217 Smith Street
Middletown, CT 06457
www.kamansensors.com
Product Description
The GMS-750RS is a measuring instrument designed specifically to measure the rotor-stator gap in large
power generators. It is based on Kaman’s proven eddy current technology used for
position/displacement sensing.
Included with the GMS-750RS are: Wall Transformer 15Vdc Power Supply, and Insertion Depth Stops.
The digital display reads the measured gap in inches over the calibrated span of 0.250” to 0.750”, with
0.001” resolution.
Normal Operation
The unit as shipped is calibrated over the 0.250” to 0.750” range and is ready to use. Insertion stops are
provided for repeatable depth of insertion when making rotor-stator gap measurements. Install them in
the desired holes provided.
Gripping the handle of the device in one hand and steadying with the other, push the spring end of the
GMS-750RS into the gap between the rotor and stator. The springs act as the target for the eddy current
sensor mounted between them. As the springs deflect upon insertion the eddy current sensor will
measure the distance between the springs and display the distance in inches between the outside
surfaces of the springs on the digital display.
Calibration
The unit is supplied with factory calibration. As with most measurement devices recalibration is
recommended at periodic intervals. Kaman recommends an annual recalibration which can be performed
by following the calibration procedure that follows, or the unit can be returned to Kaman for factory
recalibration, contact Kaman at 800-552-6267 or measuring@kaman.com
NOTE: Any means to accurately depress the target springs to the 0.250”, 0.375” an 0.750” gaps can be
used to perform a calibration.
An optional Calibration Fixture is available for calibrating the GMS-750RS consisting of: a Base Plate with
2 threaded guide pins with washers and wing nuts, and 3 Calibration Plates; .250”, .375” and .750”. Each
Calibration Plate is stamped with the dimensional value on the front of the spacer legs.
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www.kamansensors.com PART NO: 860527-001
Last Revised 8/23/2013
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