Description
The Model 4420 Crackmeter is intended to measure movement across surface cracks and joints. It is installed by grouting, bolting, or bonding two threaded anchors (with ball joints) on opposite sides of the crack and then attaching the ends of the gage to the anchors.
Feature
- Proven and reliable vibrating-wire technology
- Excellent stability for long term measurements
- Spring-loaded
- Several mounting methods
- Waterproof
- Stainless steel construction
- Accepts very long instrumentation cable
- Built-in thermistor
APPLICATIONS
- Cracks in concrete bridges, dams, and buildings
- Bridge expansion joints
Spesification
|
Standard Range¹ |
12.5, 25, 50, 100, 150 mm |
|
Resolution |
0.025% F.S. |
|
Accuracy² |
±0.1% F.S. |
|
Nonlinearity |
<0.5% F.S. |
|
Temperature Range¹ |
−20°C to +80°C |
|
Lengths³ |
318, 343, 397, 559, 649 mm (transducer) |
|
Diameter |
8 mm (shaft) / 25 mm (coil) |
1 Other ranges available on request.
2 Accuracy established under laboratory conditions.
3 Length dimensions are in mid-range position.
