© 2017 Proceq SA 17
16 © 2017 Proceq SA
7. Technical Specifications
Uniaxial (or unconfined) Compressive Strength Range
ISRM recommend the use of rebound hammers for UCS within the range 20 – 150 MPa.
ASTM recommend an upper UCS limit of 100 MPa.
Other studies have been made on rocks with UCS up to 250 MPa.
Proceq’s experience from concrete testing recommends a lower limit of about 10 MPa and above
100 MPa caution should be exercised due to the gradient of the correlation curve.
Mechanical Data
Impact energy (N) 2.207 Nm, (L) 0.735 Nm
Hammer mass 115 g
Spring extension 75 mm (2.95”)
Plunger radius 25 mm (0.98”)
Dimensions of housing 55 x 55 x 250 mm (2.16” x 2.16” x 9.84”)
Weight 570 g
Memory Data
No. of impacts in a series Maximum 99
Memory capacity dependent on length of test series
Example 400 series with 10 values per series
Example 200 series with 20 values per series
Electrical Data
Display 17 x 71 pixel, graphic
Accumulator duty >5000 impacts between charges
Charger connection USB type B (5V, 100 mA)
Environmental conditions
Operating temperature 0 to 50°C
Storage temperature -10 to 70°C
IP Classification IP 54
8. Maintenance and Support
Rebound hammers require periodic servicing and verification to provide reliable results.
Self test function
The RockSchmidt performs a number of self test checks and gives an alert when there is a problem.
These three alerts show the battery status:
Low battery
Battery full
Battery charging
Low impact energy: The impact spring is out of tolerance and should be replaced. It is
recommended to return the RockSchmidt to an authorized service centre.
Checking the calibration on the anvil
The impact spring is a consumable item that deteriorates over time. The RockSchmidt checks for
correct impact energy with each and every impact, (see above). Nevertheless it is recommended to
check the calibration on a regular basis.
Set the hammer to single shot mode and perform at least three impacts before taking any readings.
Perform a series of 10 impacts on the anvil (Part No. 341 10 400)
Check that the average R-value lies within the tolerance shown on the label. (e,g. 91+/-2 R for N-type).
If it is out of tolerance, check for smooth operation of the plunger. This problem can be solved by
applying one or two drops, (no more), of light oil (e. g. sewing machine oil). If the plunger is dirty,
wipe it with a soft cloth before applying the oil. After applying the oil, turn the plunger a few times
and depress it a few times to spread the oil evenly. Wipe off any excess oil before use. If it is still out
of tolerance it is likely that the impact spring needs replacing.
Short term, use the correction factor method (see chapter 3.4) to continue testing.
Long term, return the hammer to a Proceq service centre for servicing.
Plunger replacement
Plungers may break when impacting on very hard materials or by impacting at an angle, i.e. not
perpendicular to the surface. If you need to replace it, simply pull out the old plunger being careful
not to lose the spring (see Note below) and replace it with a spare plunger, (Part No. 343 10 310).
NOTE! There is a small spring located inside the plunger. Take care not to lose this when
removing the plunger for cleaning. Therefore hold the RockSchmidt with the plunger
downward. Pull out the plunger and remove the spring.
Support Concept
Proceq is committed to providing a complete support service for this instrument by means of our
global service and support facilities. It is recommended that the user register the product on www.
proceq.com to obtain the latest on available updates and other valuable information.
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