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SLOPE INDICATOR 50302599 Manual

Digitilt inclinometer probe
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Inclinometer Probe
Copyright ©2006 Slope Indicator Company. All Rights Reserved.
This equipment should be installed, maintained, and operated by technically qualified personnel. Any errors
or omissions in data, or the interpretation of data, are not the responsibility of Slope Indicator Company. The
information herein is subject to change without notification.
This document contains information that is proprietary to Slope Indicator company and is subject to return
upon request. It is transmitted for the sole purpose of aiding the transaction of business between Slope Indi-
cator Company and the recipient. All information, data, designs, and drawings contained herein are propri-
etary to and the property of Slope Indicator Company, and may not be reproduced or copied in any form, by
photocopy or any other means, including disclosure to outside parties, directly or indirectly, without permis-
sion in writing from Slope Indicator Company.
Digitilt
50302599
SLOPE INDICATOR
12123 Harbour Reach Drive
Mukilteo, Washington, USA, 98275
Tel: 425-493-6200 Fax: 425-493-6250
E-mail: solutions@slope.com
Website: www.slopeindicator.com

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Summary of Contents for SLOPE INDICATOR 50302599

  • Page 1 Company and the recipient. All information, data, designs, and drawings contained herein are propri- etary to and the property of Slope Indicator Company, and may not be reproduced or copied in any form, by photocopy or any other means, including disclosure to outside parties, directly or indirectly, without permis- sion in writing from Slope Indicator Company.

  • Page 2: Table Of Contents

    Contents Introduction ..... . . 1 The Inclinometer Probe ... . . 2 Control Cable .

  • Page 3: Introduction

    Introduction Inclinometer An inclinometer system includes inclinometer casing, an inclinometer probe and System control cable, and an inclinometer readout unit. Inclinometer casing is typically installed in a near-vertical borehole that passes through a zone of suspected movement. The bottom of the casing is anchored in stable ground.

  • Page 4: The Inclinometer Probe

    The Inclinometer Probe Parts of the Probe The inclinometer probe consists of a stainless steel body, a connector for control cable, and two pivot- Control cable ing wheel assemblies. Connector for control cable When properly connected to the control cable, the probe is waterproof and has been used deeper than Upper wheel of 1000 feet.
  • Page 5 Handling The inclinometer probe is a sensitive measuring instrument. Handle it with care. the Probe • Transport the probe in its carrying case. If you drive to the site, carry the casing in the passenger compartment, preferrably on a passenger seat. •...

  • Page 6: Control Cable

    Control Cable Introduction Control cable is used to control the depth of the inclinometer probe. It also con- ducts power to the probe and returns signals to the readout. • Metric control cables are graduated with yellow marks at 0.5 meter intervals and red marks at 1-meter intervals.
  • Page 7 When you connect control cable to the probe, avoid overtight- Cable Tips Connecting Cable: ening the nut, since this will flatten the O-ring and reduce its effectiveness. If you have time, “calibrate” your cable, recording the exact Calibrate your Cable: position of cable marks.

  • Page 8: Taking Readings

    Taking Readings • Good Practices Use the same probe and control cable for each survey, if possible. • Use a pulley assembly, if possible. It protects the control cable and provides a good reference. • Use a consistent top reference. The goal is placement repeatability within 5 mm or 1/4 inch.
  • Page 9 Record Data Raise the probe to the starting depth. Wait for the numbers on the readout to sta- bilize. If you are using the DataMate, press the button to record both the A and B axis readings. If you are using a manual indicator, write down the A-axis reading, then switch to the B-axis and record that reading.

  • Page 10: Data Reduction

    Data Reduction Inclinometer The inclinometer probe measures tilt, rather than lateral movement. side opposite Measurements How does tilt provide information about lateral movement? The basic principle involves the sine function, an angle, and the hypote- nuse of a right triangle. We are interested in the length of the side opposite the angle θ.
  • Page 11 Displacements Changes in deviation are called displacements, since the change indicates that the casing has moved away from its original position. When displacements are summed and plotted, the result is a high resolution representation of movement. Incremental displacement plot Cumulative displacement plot shows movement at each shows a displacement profile.
  • Page 12 Reducing Data Normally, computer software is used to reduce inclinometer data. Here, we show Manually only a simple overview. Displayed Readings Slope Indicator’s readouts display “reading units” rather than angles or deviation. Reading units are defined below: θ × Displayed Reading Instrument Constant θ...
  • Page 13 Calculating A checksum is the sum of a “0” reading and a “180” reading at the same depth. Checksums A0 reading = 359 A180 reading = -339 Checksum = 359 + (-339) = 20 Bias (zero offset) If you hold your inclinometer probe absolutely vertical and check the reading, you will typically see a non-zero value for each axis.

  • Page 14: Inspection And Maintenance

    Inspection & Maintenance Probe Part What to check for Remedy Inspection Wheel yoke Side to side movement Check pivot pin, which looks like screw. If pivot pin has been turned too far, it may spread the wheel yoke. Turn the pivot pin counter-clockwise to see if movement dis- appears.
  • Page 15 Control Cable Part What to check for Remedy Inspection Cable Continuity If you have intermittent failures, perform continuity tests. If a wire fails continuity test, you can check the Lemo con- nector or return cable for servicing or replacement. Cable Twists, worn markings, Twists indicate poor coiling technique.
  • Page 16 Control Cable Below is the wiring diagram for the connectors on the control cable. Connectors Testing Connectors are made to mate with each other but not with any other objects. Never insert the probe of your multimeter into a socket. In making the measurements below, simply touch the probe to the top of the socket.