ACM-1A ACPD Crack Growth Monitor
Data sheet, features and applications for the ACM-1A.
Legacy
ACM-1A ACPD Crack Growth Monitor
Designed as a ‘black box’ ACPD crack growth monitor to reduce cost and simplify end-user installation, the ACM-1A is ideally suited to semi-permanent installations for long-term crack growth monitoring — for example in power-utility installations and structural applications.
The ACM-1A uses the alternating current potential drop method (ACPD), an established technique covered by the ASTM E647 standard. An alternating current is passed through the metal under test and the resultant voltage drop across the specimen is measured. A growing defect alters this voltage, and with suitable calibration a measure of defect depth can be obtained.
Features
- 300Hz output frequency, normally fixed (variable-frequency models available)
- Built-in scan controller — measure multiple locations from one unit
- Built-in high-precision pre-amplifier circuitry
- Small, compact size: only 160 × 160 × 60 mm
- 2A output, normally fixed (variable-current models available)
- Two channels as standard, measuring active and reference signals
- Wi-Fi and Ethernet communication modules available
- Fixed gain setting at 20,000
Applications
- Slow crack growth
- Crack sizing
- Stress corrosion testing
- Crack initiation
- Fatigue crack initiation
- Condition monitoring