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Home > Products > Hardness > Concrete Test Hammer, SilverSchmidt & Digi-Schmidt
Concrete Test Hammer

Original Schmidt® Test Hammer

Type N/NR Schmidt Test Hammer
The Type N hammer is designed for testing concrete items 4” (100 mm) or more in thickness, or concrete with a maximum particle size less than or equal to 1.25” (32 mm).

The Type NR hammer provides a record of test data. Rebound values are recorded as a bar chart on a paper strip. One roll of paper strip documents 4,000 test impacts.

Both hammers are also used for the testing of massive rock. Impact energy is 1.6 ft-lbs (2.207 Nm). Units have 1,450 psi to 18,150 psi (10 to 70 N/mm2) compressive strength.Testing Standards for N/NR: ASTM C 805, D 5873; BS 1881: Part 202

Schmidt Concrete Test Hammer

Type L/LR Schmidt Test Hammer
The Type L/LR hammer operates with significant lower impact energy, making this hammer the ideal option for testing thin walled items with a thickness between 2” and 4” (50 to 100 mm) or for testing small components.

The Type L/LR is suitable for testing cast stone components which are sensitive to impact. In rock mechanics, the Type L/LR hammers are commonly used for classification testing of rock cores and brittle rock.

Testing Standards for L/LR: ASTM D 5873; ISRM Suggested Method for Rebound Index of Rock Cores


Hammer Diagram


Anvil

To operate, place impact plunger against test surface and apply pressure until plunger disappears; hammer will release. Scale pointer reading gives rebound value in percent of the forward movement of the hammer mass. Includes grinding stone, plastic case and instruction manual.

Hardened steel test anvil used for periodic performance tests and on the HA-832000 series (type “N” only) test hammers. Shipping weight is 49 lbs. (22.2 kg). Refer to ASTM C 805 for instructions.


Concrete Test Hammers Video


Available Items - Literature
Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices
HA-832001 Schmidt Concrete Test Hammer (Type N) (psi scale) $766.00
HA-832003 Schmidt Concrete Test Hammer (Type N) (metric scale) 766.00
HA-834001 Schmidt Concrete Test Hammer (RecordingType NR) (metric scale) 1,565.00
HA-834211 Schmidt Concrete Test Hammer (Type L) (metric scale) 1,105.00
HA-834218 Schmidt Concrete Test Hammer (Recording Type LR) (metric scale) 2,040.00
HA-832013 ASTM Test Anvil (meets ASTM C805 standards) 576.00
HA-832015 Verification/Calibration Testing Anvil (N/NR/ND/L/LR/LD) 1,085.00
HA-834225 Registration Paper (NR/LR), Pack of 5 rolls 112.00


SilverSchmidt Concrete Test Hammer

The first integrated Concrete Test Hammer


The SilverSchmidt features true Rebound Value, unmatched Repeatability and intuitive Opeartion all in a rugged and ergonomic Unit.
 
Traditional Hammers vs. SilverSchmidt
The classical hammers suffer from the following insufficiencies:
  1. The rebound value is dependent on the impact direction.
  2. The rebound value is affected by internal friction.
  3. Limited tightness of sealing causes premature loss of accuracy.
The unique design and high quality construction of the SilverSchmidt address all of these issues and makes rebound hammer testing quicker and more accurate than ever before.
 
Customer Benefits
Ergonomics: The SilverSchmidt body lies very comfortably in the hand. The display is highly readable under any conditions.
Robustness: A two-layer seal prevents dust and dirt from penetrating to the interior of the instrument.
Impact direction independence: The forward and the rebound velocity of the hammer mass are both measured in close proximity to the point of impact. The rebound value requires no angular correction.
Measurement accuracy and repeatability: The new measurement principle and the design of the mechanics enable the SilverSchmidt to ouperform its predecessors.
Objective evaluation: A larger number of measurement points can be easily collected by the instrument and automatically evaluated according to statistical criteria.
PC connection: The application “Hammerlink” allows all data to be uploaded via USB. Firmware upgrades
are also possible over this connection.
 
Improved Performance
Two factors contribute to the improved performance of the SilverSchmidt over its predecessors:
  1. Velocity based detection of the rebound quotient.

  2. The lightweight hybrid design of the impact plunger is made from aerospace alloy, matched to the elastic properties of the concrete and equipped with a hardened steel cap.


Intuitive User Interface
The language independent user interface is simple to use and provides all of the functionality necessary for a rapid assessment of the structure. An inclination sensor allows the user to navigate from left to right within the menu. By depressing the single push-button (SELECT), the particular function is activated. The menu structure is simple, similar to the interface of a mobile phone. Practically every command can be activated either directly or via no more than 2 consecutive steps.

Data Acquisition and Processing
Pre-programmed statistical methods in-line with all of the major standards allows an error-free, rapid determination of the rebound value. Summary views in Hammerlink make uniformity testing a simple matter. Reduced dispersion and direct conversion to compressive strength based on validated curves, regional curves or user defined curves bring improved accuracy to compressive strength estimates.

Hammerlink - Data Analysis made simple
The Windows based software Hammerlink unlocks the full capabilities of the SilverSchmidt, making it an even more powerful instrument for structural assessment (SilverSchmidt PC version only).


Hammerlink Features
  • Extended memory usage
  • Rapid uniformity assessment with the summary view
  • Sorting of data
  • User-defined conversion curves (polynomial and exponential)
  • User-defined statistical methods
  • Highlighting of mean, median and outliers
  • Carbonation correction
  • Print outs
  • Export to third party software

Technical Information Hammerlink Software
System requirements: Windows XP, Windows Vista, windows 7, USB-connector. An internet connection is necessary for automatic Hammerlink software updates and for SilverSchmidt firmware updates (using PqUpgrade), if available. PDF Reader is required to show the “Help Manual”.

Applicable Standards:
EN12504-2 (European Standard)

JGJ/T 23-2001 (Chinese Standard)

ASTM C 805 (North American Standard)

Technical Information SilverSchmidt
Mechanical Data Type N Type L
Impact Energy: 2.207 Nm (1.63 lb ft) 0.735 Nm (0.54 lb ft)
Concrete Compressive Strength Range: 10-100 N/mm2 (1450-14500 psi)
Hammer Mass: 135 g
Spring Extension: 2.95” (75 mm)
Dimensions of Housing: 2.16” x 2.16” x 9.84” (55 x 55 x 255 mm)
Weight: 1.3 lb (570 g)
Memory Data
Max. No. of Impacts in Series: 90
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
Battery Life: >5000 impacts between changes
Charger Connection: USB type B (4 V, 100 mA)
Environmental Conditions
Operating Temperature: 32 to 122°F (0 to 50°C)
Storage Temperature: 14 to 158°F (-10 to 70°C)

Silver Schmidt Models
ST Standard model. Software provided for performing firmware upgrades and selecting presets only.
PC Extended memory usage. Custom curves. Download to PC. Full Hammerlink Software functionality.
N-Type standard impact energy. The test object should have a min. thickness of 100 mm and be firmly fixed in the structure.
L-Type low impact energy. Suitable for brittle objects or structures less than 100 mm thick.

Available Items - Literature
Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

SilverSchmidt hammer, Battery charger with USB cable, Chalk, Documentation, Data carrier with software, Carrying strap, Grinding stone, Carrying bag
HA-835203 Unit, SilverSchmidt ST Type N $1,735.00
HA-835205 Unit, SilverSchmidt ST Type L 1,735.00
HA-835213 Unit, SilverSchmidt PC Type N 2,205.00
HA-835215 Unit, SilverSchmidt PC Type L 2,205.00
Anvil
HA-835221 Testing anvil SilverSchmidt 1,340.00
HA-835222 SilverSchmidt adapter for testing anvil Euro 142.00
Optional Accessories
HA-835243 Plunger SilverSchmidt ST/PC complete 161.00
HA-835245 Cover for USB port 20.00
HA-835247 Carrying bag 18.00
HA-835253 Carrying strap (loop) 44.00
HA-835255 Grinding stone 26.00
Standard Warranty: • Electrical portion of the instrument: 24 months • Mechanical portion of the instrument: 6 months
Extended warranty: When acquiring a SilverSchmidt, max. 3 additional years of warranty coverage can be purchased (for the elctronic portion of the instrument). The additional warranty must be requested at time of purchase or within 90 days of purchase.


Digi-Schmidt® 2000

Digi-Schmidt® 2000 By entering the depth of carbonation, the conversion of rebound value to the compressive strength is automatically compensated.
  • Non-destructive measurement of the concrete compressive strength and control of the uniform concrete quality (in-situ concrete and prefabricated structures)

  • Detecting weak spots

  • Data-Transfer to PC/printer

Concrete Testing with original DIGI-SCHMIDT 2000 Hammer, types ND and LD
The classic ORIGINAL-SCHMIDT concrete test hammer is equipped with a sensor which measures the rebound value of a test impact to a high resolution and repeatability. Basic settings and measured values are shown on the display unit. Operating is menu-guided in different languages. The DIGI-SCHMIDT 2000 is available in two versions:
  • Type ND (impact energy) 1.6 ft-lbs. ( 2.207 Nm) - suitable for use on concrete components of 4” (100 mm) thickness or more
  • Type LD (impact energy) 0.54 ft-lbs. (0.735 Nm) - suitable for use on concrete components of thickness less than 4” (100 mm) and on cast stone material

Display All information displayed on a large clear display

Technical Data
Test Hammer Type ND Type LD
Impact Energy: 1.6 ft-lbs. (2.207 Nm) 0.54 ft-lbs. (0.735 Nm)
Measuring Range of Compressive Strength: 1450psi to 10,150psi
10 to 70 N/mm2
1450psi to 10,150psi
10 to 70 N/mm2
Accuracy of Measurement: ±0.2 R ±0.2 R
Reproducibility: ±0.5 R ±0.5 R
Display: Unit with non-volatile memory for max. 500 measurement series of 10 values each, graphic LC-Display 128 x 128 Pixel. Interface RS 232
Integrated Software: For printing the measured values and transmitting to PC
Temperature Range: -10 to +60°C
Battery Operation: Six AA batteries, 1.5 V, for 60 hours.
Dimensions: 12.8” x 11.6” x 4.15” (325 x 295 x 105 mm)
Total weight: 3 kg.
Includes: Transfer cable for PC, test hammer cable, grind stone, carrying strap, operating instructions, protection sleeve and carrying case.

Available Items - Literature
Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices
HA-834101 Digi-Schmidt 2000 Hammer, Type ND $2,710.00
HA-834201 Digi-Schmidt 2000 Hammer, Type LD 2,710.00

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