Length Comparator, Mortar/Cement Bars, 16in Effective Length
Overview
A Length Comparator is a precision instrument used to measure length changes in cement paste, mortar and concrete specimens. It’s a must have in construction, engineering and research industries. The device consists of a precision unit with a sensitive indicator mounted on a heavy duty, dual post frame for stability and support.
Description
The Length Comparator is a precise instrument used to measure length changes in cement paste, mortar and concrete specimens. Meets ASTM and AASHTO specifications for accuracy and reliability. Precision unit with sensitive indicator on a heavy duty, dual post frame for stability and support.
Key Components
A digital indicator, or optional dial indicator, gives highly accurate readings of length changes, so you can monitor even the smallest changes in specimen dimensions. For exact zeroing and calibration the invar reference bar is included, it’s very stable and has minimal thermal expansion, essential for maintaining measurement accuracy over time.
Specs
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Indicator Type: Unit is available with dial or digital indicator, in English or Metric units.
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Reference Bar: Has a precision-machined Invar steel reference bar for exact zeroing of dial or digital indicator.
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Anvils: Stationary and movable anvils designed to receive reference pins cast into test specimen bars.
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Support Stand: Heavy duty vertical support stand with triangular base and adjustable terminal and collar.
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Power: Two standard replaceable lithium batteries or AC adapter.
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LCD Digital Display: Auto On/Off, inches and millimeters, internal memory for user settings.
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Models: Multiple models available with different features and configurations.
Measurement Capabilities
The Length Comparator can measure changes in test specimens with high accuracy. It has a digital or dial indicator for precise measurement and will accept specimens with 4″ x 4″ cross section or smaller. The anvils are designed to fit gauge studs cast into specimens for accurate and repeatable measurements. It can measure changes in various types of specimens, concrete prismatic specimens and can be used with a reference bar.
Why a Digital Indicator Length Comparator
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Accuracy: High accuracy and precision.
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Reliability: Consistent and reliable results meet ASTM and AASHTO specs.
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Ease of Use: Easy to use.
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Versatility: For research and development, quality control, construction, a tool for many applications.
Length Comparators measure changes of hardened cement paste, mortar and concrete prismatic specimens. Indicators, including a digital indicator mounted on a heavy duty vertical support, are attached to a solid triangular base. All units include anvils designed to fit gauge studs which are cast into test specimens and invar reference bar. The anvil assembly has an elevating screw and nut collar for precise specimen positioning and secure adjustment during testing. Comparators for 10” (254mm) or 16” (406mm) effective length samples with 3.625” (92mm) dia. dial gauge with a range of .400” and gradations of .0001”. The Dial is marked 0-10. Includes stationary and movable anvils designed to fit the H-3260 gauge studs that are cast on test specimens and invar reference bar. Unit will accept test specimens up to 4” x 4” (102 x 102mm) cross section. Battery operated, included.
