I am looking for a small diameter inclinometer for use in lateral load testing of small-diameter drilled shafts. I would like to find something that would work inside of a 1-inch-dia. +/- casing to minimize disturbance efects to the concrete shaft. Thank you.
Regarding inclinometer with small diameter. We have one inclinometer with a diameter of 25.4 mm which we usally install in plastic tubes.
The multi-inclinometer consists of a number of gauges connected by plastic tubes. The inclinometer unit is installed in plastic tubes in the ground or in boreholes in rock, with gauges at the desired levels. The multi-inclinometer is fixed either at the top or bottom and each gauge measures the inclination in a fixed direction. By combining the inclina-tion of every gauge, the horizontal deformation at each gauge level can be calculated. Each gauge consists of a magnetic resistance sensor that reads the posi-tion of a pendulum inside the unit. Owing to this sensor construction the multi-inclinometer is zero stable, which is a condition for permanent installation. To avoid disturbance from vibration the pendulum is en-closed in oil. Each gauge has a transmitter which gives a read-out signal of 4-20 mA. The read-out signal and the input voltage is transmitted through an or-dinary 2-wire cable. The tightly sealed gauge has springs on the pe-rimeter to secure an exact position in the tube or borehole.
Technical Specifications  Zero stable  Installation vertically: ±8 to ±160 mm/m  Accuracy: 0.2% of the measuring range  Dimensions: length 250 mm, diameter 25.4 mm. Standard to fit in 42 mm tubes or boreholes.  Temperature range: -40 - +85°C  Input voltage: 12 - 36 V
Do you need any more information please do not hesitate to contact me. If I get your e-mail address I could send you more paper of our inclinometer.
Bob, Have you found something to carry out this work?
We have an inclinometer that is a little over an inch in diameter that could fit inside 1,5 inch ID pipe if the wheels are removed. This would mean that the inclinometer would have to be oriented with torque rods.
What are your needs in terms of accuracy, repeatability, resolution etc. There are other options that may fall within the 1 inch diameter requirement.