- Index
- CMCS at BRE
- Development of AMS
- Non-destructive testing of Marine Jetties
- Fixed sensor monitoring of Diaphragm walls
- Monitoring Buildings during Redevelopment
- Tunnel Monitoring
- Embankment Systems
- Loggers
- Tunnel Distortion Monitoring
- In-place tilt monitoring system
- Tunnels Interaction System
- Re-Development of Small Properties
- Viaducts
- DLR at Mansion House
- Tunnel Monitoring System (Discrete beams)
- CTRL 240
- Dams
- Electro-levels
- Movement indicators
- Results of Charing Cross Load Cells
- Non-destructive testing of concrete structures
- Radio in Construction Monitoring
- Settlement Reducing Piles
- Land Surveying and Total Station Monitoring
- Vibration Monitoring
- Monitoring the complete strain history of concrete elements
- Past CMCS Projects
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CMCS has developed a wide range of loggers for both Geotechnical and Structural monitoring. The Monitor MK 2 Series currently consists of:
| Logger type | Application |
| Monitor Mk 2(Needs multiplexers) | 256 channels max. Electro-levels (ELs), Pressure LVDTs, Electrical Resistance Strain Gauges (ERS), Vibrating Wire Strain Gauges (VW), Potentiometric Transducers (PTS), Temperature Sensors + Thermocouples (TS), Load Cells |
| M-EL16+(Built in Mux of 16 channels) | Additional multiplexers up to 240 channels, ELs, PTS, TS. |
| M-VW16+(Built in Mux of 16 channels) | Additional multiplexers up to 240 channels (32 or 16 Chns), VW, LC, TS |
| M-EL6 (built in 6 channels)M-V3 (structural vibration) | ELs, PTS, Pressure Cells, TS, Geophones, Accelerometers |
| M-VW1c (single channel)(RS232 for direct PC link) | VW, LC. |
| LP-EL6 (low powered)(ac energisation) | ELs, PTS, TS (Not RS comms). Fitted with local alarm. |
| LP-DC6 (low powered)(dc energisation) | PTS, Pressure Cells, mV to 10 volts (Not RS comms). Fitted with local alarm |
| 16 chn Radio loggersBoth EL & VW | The system consists of transmitters and a logger. The logger can store both EL and VW data. Range 400 m through non ferrous structures |
| M E 8 & M VW 8 | Fitted with alarm unit to send message via modem or GSM. Low powered with re-chargeable batteries |
The loggers can be powered by: 110 -240 volts a.c., or by 12 to 36 volts d.c and solar panels and a rechargeable battery can power the systems indefinitely in remote areas. Each logger can store up to 64,000 readings (as standard) and are fitted with both RS232 and 485 communications.
They are designed for direct cable to PC, or conventional and GSM modem connection. CMCS has also developed radio communications between its loggers and a central P.C. The range of loggers allows the user to choose the most cost effective system to meet their particular requirements, i.e. from an initial small-scale investigation tool to a major automatic control system. The loggers may be used as a stand-alone real time data logger or linked with a PC into a global system of 128 loggers, each logger being 1 kM apart. They may also be used as automatic alarms with the ability to raise alarms locally, independent from a PC. The photo above shows a Monitor Mk2 logger with multiplexer. Some of the series have built in multiplexers for single sensor systems.
For work on railway systems the MK 2 series has passed EMC tests to ensure it does not emit electrical magnetic transmissions that could adversely affect signals on railway systems and conversely it is not affected by other electrical emissions likely to occur on railways.
The photos below show tests being carried out in both resonance and anechoic chambers by Intertek Testing Services (ITS) of Leatherhead, Surrey.
The tests showed that the system for monitoring both electro-levels and vibrating wire gauges complied with:
London Underground Limited Engineering Standards on EMC (E 1027 A1)
and
European Community Directives:
89/336/EEC and Railway Standard EN 50121-4:2000
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