Series 4300 - Displacement Monitoring - Tunnel and Joint

4300 Vibrating Wire Crack Meter

Suitable for a wide range of displacement monitoring applications, including cracks in structures, piles, foundations and construction joints. Range 0 - 50mm.

4350 Potentiometric Crack Meter

Shown above.
Suitable for a wide variety of applications where displacements of up to 150mm are to be monitored. Ideal for structures, piles, foundations and construction joints. Read using model 9600-1 readout.

4370 Tell-Tale Crack Monitors

Brochure

Each monitor consists of two plates that overlap for part of their length. One plate is calibrated in millimetres and the other is transparent and marked with a hairline cursor. The relationship of the cursor to the scale represents the amount of movement occurring. Range (20mm. Resolution 1mm.
A 4370-1 Standard. B 4370-2 Corner. C 4370-4 Displacement. D 4370-5 Plus.

4410 Manual Convergence Monitor

The model 4410 is a rigid telescopic, direct reading measurement system. It features a high degree of accuracy, direct readout through a window and five individually lockable sections. Used with domed targets, the 4410 provides a very simple and economical method of convergence monitoring.

4420 Convergence Monitor

Brochure General Arrangement General Arrangement 2

The model 4420 is based on a spring loaded wire mechanism. It has a measuring range of 1m and can monitor any reasonable distance with extension wires. When used with model 9600-2 readout, the unit's high resistance electrical output has a resolution of 0.1mm. The 4420 is suitable for remote reading and data logging. It is light, small in size and simple to install.

4500 Tape Extensometer

Brochure Analogue Brochure Digital

The model 4500 is a portable device designed to measure the relative displacement between reference anchors fixed to the excavation or structure. Both grouted and expanding anchors are available. Ranges 10m, 15m and 20m. Resolution 0.05mm.