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1.5 Hardness tester probes
The standard delivery set includes 2 probes – ultrasonic contact impedance and
dynamic probe type "D". At the request of the consumer, additional probes may be included
in the delivery set of the hardness tester.
The probes are used to generate a signal that carries information about the hardness of
the controlled product.
The Rebound Leeb Probe – purposed for hardness measurement by dynamic method.
It is intended for measuring hardness of large-sized objects and also coarse-grained materials.
To ensure optimal measurement conditions on products, hardness testers can use
additional dynamic probes with different dimensions and different spring stiffness, which
provide different impact energy of the indenter against the tested product.
In a dynamic probe, the support washer can be removed (unscrewed) from the probe
to reduce the area required for its placement on the surface of the product during
measurement.
The Ultrasonic Contact Impedance Probe – measurement of hardness by Ultrasonic
Contact Impedance method. The use of a diamond indenter allows the probe to be mounted
precisely at any tiny point, and leaves a small-size imprint, making the measurement of the
UCI probe the least destructive.
The probe is perfectly suited for the following tasks: measuring the hardness of
complex shapes, fine-grained materials, heat-treated materials, thin layers and coatings,
surface hardened parts, thinwalled pipes, small parts, etc.
In the ultrasonic probe, the protective nozzle (nose) serves to protect the rod from
overload and contact with a foreign object or the user's hand during the measurement. When
measuring hardness in hard-to-reach places, it is permissible to remove the protective cap,
while the permissible parameters of the holes/grooves will be changed (table 1.5).
Probes are manufactured with built-in connecting cables for connection to the
electronic unit or with a built-in connector for connecting cables according to the user's order.
The list of typical probes is given in Table 1.2.
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