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AL-40 Weld Micro-ohmmeter.

AL-40 Micro ohmmeter. Joint Tester. Measurement Range 20µΩ to 200Ω. Current 5A.
The AL-40 allows a precise and easy quality control of aluminothermic welded joints.
The instrument measures the electrical resistance resulting of the fusion of the welding with the conductors.
The advantage of this method is that it gives a measurement and not just a visual appreciation.
The AL-40 is equipped with a probe designed specifically for aluminothermic welding, and that uses the
four-points measuring method. This technique consists of injecting a known current through two current
contacts, then to measure the voltage with the help of two voltage contacts placed in between.
Measuring an aluminothermic joint The AL-40 microohmmeter takes a measuring automatically as soon as the four contacts are pressed against the welding.

Weld Micro-ohmmeter

Model  Description 
AL-40  AL-40 Weld resistance tester. Micro-ohmmeter.

The AL-40 is equipped with a probe designed specifically for aluminothermic welding, and that uses the
four-points measuring method.
This technique consists of injecting a known current through two current contacts, then to measure the
voltage with the help of two voltage contacts placed in between. The current is read as well, to eliminate the
contact-resistance factor. The instrument is also equipped with a microprocessor that eliminates offsets
and parasite voltages.

Weld Micro ohmmeter specification

Precision  0,5% of the reading, +/- 2 counts 
Measurement Range  20µΩ to 200Ω 
Resolution  0.01 µΩ 
Running Temperatures  -20°C to +50°C (-4° F to 122° F) 
Storage Temperatures  -40°C to +50°C (-40° F to 122° F) 
Humidity  0 to 95% non condensed. Submersible, rain proof 
Measurement Current  5 mA, 250 mA, 5A 
Autonomy  more than 5000 measurements, at 5A
more than 10 000 measurements, for the other currents 
Battery  Six (6) 1.2V, 2.1Ah rechargeable "A" NiMh batteries 
Charger  12V 1A adapter with sealed connector, available for 110V or 220V 
Display  Liquid crystal 128 X 64 dots, wide ranging temperatures
2.36 X 1.62 in. (60 X 41 mm)
2 back-lighting intensities (100%, 50%)8 X 4.5 X 2 in. 
Size & Dimension  (203.3 X 114.3 X 50.8 mm) 
Weight  1.9 lbs (0.86 kg) 

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