Description
Crack Movement Recorder Kit (Wireless)
The Wireless Crack Movement Recorder provides continuous recording of both movements in crack width and ambient temperature. The unit is configurable to measure at a pre-defined interval of 1 minute to 91 hours.
The built-in data logger stores readings for later download wirelessly onto a PC from a range of up to 150m. This kit contains everything required (except the PC) to set up a monitoring system. Further units can be purchased individually to extend the system.
The unit is powered by a user-replaceable battery, which should last between six months and five years, depending on how the unit is configured and the frequency of downloads.
The measurements are stored in internal memory and are downloaded to a Windows PC using a USB Communications Module CMR-R12 (one included). One Communications Module can be used to connect to up to 32 Crack Movement Recorders.
Monitoring in two dimensions using two units (normally horizontal and vertical) is explained in the manual.
The unit is supplied with fixings and the latest version of the user guide and software.
Specifications
Movement Sensor
- Range: 80 mm (extension cables are available)
- Resolution: 0.003 mm
- Linearity: 0.07% full scale
Temperature Sensor
- Range: -20 C – +80 C
- Resolution: 1 C
Data Logger
- Capacity: 31926 Readings (15963 readings with redundancy)
Wireless
- Frequency: 915 MHz (Australia)
- Range: 150 m in free space
Electrical
- Power Supply 3.6v 1/2AA Battery
Mechanical
- Working Temperature: -35C – +85C (or according to the installed battery)
- Cable Tension: 10N
- Protection Rating: IP65
- Mass: 200g
System Requirements
The software requires Windows XP or later.
Installation
With the Recorder fixed using the supplied AF11 screws and plugs and/or AE14 Araldite Rapid Epoxy (available separately), the cable extends across the crack and secures to the opposite surface using the supplied vine eye screw. Full instructions provided.
It is also recommended to record the ambient temperature as seasonal changes may affect the evaluated structure.
For a better understanding of cracking causes and structural behaviour, we highly recommend the book “Guide to Subsidence”, also available in our store.
