![[Home]](../iconz/home.gif){kind=small}
The CoverMaster® CM52 Covermeter |
|
The professional's cover meterMillions are spent each year repairing concrete structures whose reinforcement bars have corroded due to inadequate cover. Any concrete surface, whether it's newly built or part of a long-standing structure, can be hiding a time-bomb.The CM52 CoverMaster cover meter has been designed in close cooperation with the construction industry to locate rebars quickly and precisely and measure concrete cover with unparalleled accuracy. The CM52 uses an exclusive technology that delivers unvarying precision under all site conditions and in all types of concrete.
Rapid resultsThe loud audio signal helps locate rebars quickly and precisely. Scan large areas without constantly watching the meter.
Industry leading accuracyThe directional search head locates rebars, establishes their direction and measures cover with great precision at very close centres.
Easy to useOperated using three basic control knobs which give a distinctive click for confidence the CM52 can be mastered in minutes. An informative audio tone gets louder as it approaches the bar, quickly indicating depth of cover.
Extremely robustDesigned and built to withstand daily use in the toughest conditions. Thousands are in use in construction sites around the world.
VersatileAutomatically accepts a midget head for direct reading of cover under 30mm at very close centres. Ideal for checking pre-cast lintels and pipes.
We've used Protovales for years, and the CM52 is a welcome addition to the range. Gareth Moorhead, Project Engineer,
|
The Protovale AdvantageAll Protovale instruments are designed by the world's leading experts in the field of pulse induction technology. They use a unique system which is unaffected by moisture or temperature changes, making Protovale instruments remarkably stable in all site conditions.
Please contact us now for more information or a free demonstration |
 Protovale Oxford Ltd, Rectory Lane Trading Estate Kingston Bagpuize, Abingdon OX13 5AS, England Tel: +44 (0) 1865 821277, Fax: +44 (0) 1865 820573 email: info@protovale.co.uk |
Better technology for better performance |
|
| Protovale CoverMasters are acknowledged worldwide as the best performing cover meters available. They maintain their accuracy on site -- not just in laboratory conditions. | |
Precision you can rely on in all conditions |
|
|
The CM5 sends pulses of current through air-cored search coils and measures the resulting eddy current. This exclusive Pulse-Induction Eddy Current technology is uniquely stable and is immune to temperature variations, electrical interference, magnetic aggregates and the ionic effects of moisture in wet concrete.
Most other cover meters use magnetic search heads which are temperature sensitive and react unpredictably to nearby metal and magnetic aggregates.
"A rifle, not a shotgun"The CM52 has a very narrow search field which gives the strongest signal when the search head is lined up with the rebar, and the weakest signal when the search head is at right angles to the rebar.This enables the operator to quickly locate rebars, quickly determine their orientation and obtain accurate cover readings even in congested situations.
There is very little response at the sides of the head, so the CM52 remains accurate near scaffolding and metal window frames. It also resolves cover in dense, complex rebar structures.
Welded Mesh FabricThe directional search head allows the "drilling safe spots" in welded mesh fabric to be located, and the cover to be measured accurately. |
The Standard HeadWith the standard large head the CM52 can resolve bars and measure cover at closer pitches than any of its rivals with their large head, eg 50mm cover and 75mm pitch between centres (less than 60mm separation between bars).
The above structure of bars might pose difficulties for some cover meters which cannot give accurate readings of cover in congested situations . . .
. . . but the CM52 remains accurate at even greater depths as shown below
|
The Midget HeadWith the midget head the figures are scaled down dramatically to give accurate readings of cover under 30mm and at very close centres.For example, T10 bars can be resolved and measured at 15mm cover at as little as 30mm centres (a mere 20mm separation between bars).
Advantages of the Midget Head
The truth is at the centreWe always quote the 'pitch' as the distance between bar centres.Some manufacturers make accuracy claims based on the 'spacing' between bars -- a smaller figure. Make sure you know which figure is being quoted!
Maximum depth of cover and resolutionFor parallel bars to be resolved by any cover meter the pitch must typically be at least 1½ times their cover.
Bar SizingMeasures cover to bars of unknown sizeA simple bar-sizing method requires just two measurements and a look-up graph, to provide an indication of the bar size.The resulting cover reading is alway reliable. |
Standard features
Data-logging cover readingsThe CM52 is fitted with an analogue output socket suitable for connecting to any commercially available data-logger.For example, we have successfully used a Psion Organiser II with a Digitron A/D module to log data from a CM52, and to download that data to a PC running its own Terminal or HyperTerminal comms application. We also wrote an experimental simple-to-use "PvLogger" program for Win3.1/Win95 to accept the data from the Psion, save that data, and print either the raw data or a histogram with statistical analysis. Please contact us if you intend using a data-logger.
Talk to usProtovale participates in industry and academic conferences around the world, analysing the technical issues associated with concrete cover inspection and explaining best practice.We have worked with most of the leading consulting engineers in many countries and are always willing to share our experience with users. In addition, our technical papers are available for instant reference on the Protovale web site at www.protovale.co.uk |
PerformanceWith Standard head:Cover measuring range25mm to 100mm for all bar sizes Accuracy
better than ±2mm from 30mm to 65mm,
±3mm from 70mm to 90mm.
Resolution:
T16 bars at 50mm cover and 75mm pitch
(less than 60mm separation).
With Midget head:Cover measuring range 6mm to 50mmAccuracy
±1mm or better from 10mm to 30mm,
±3mm from 35mm to 45mm.
Resolution:
T10 bars at 15mm cover and 30mm pitch
(20mm spacing).
Bar sizingProtovale's published spacer-ratio method yields:an accurate determination of the cover to a bar of unknown size, plus an estimation of the bar diameter.
Standards conformanceMeets or exceeds all requirements of BS1881:204 & DGZfP:B2Conforms to cover-measuring requirements of: EC2, DIN1045 SIA162, and ACI318.
ControlsZERO knob: On/off switching and instrument zero-set.DIAM knob: 11 selectable bar sizes: 5, 6, 7, 8, 10, 12, 16, 20, 25, 32 & 40 mm. MODE knob: four position function selector: LOCate: rapid bar location with audio signal, CALib: indicates signal strength for precise zeroing, DEPth: indicates cover in mm (audio off), +aud: indicates cover in mm (audio on). Instrument automatically senses which head is connected.
DisplayDirect LCD readout of cover in millimetres.
ConnectorsHead: 3-pin DIN41524 screw-locking connector for head leadPhones: standard 3.5mm stereo jack socket Logger: 3.5mm mono jack socket Charge: 2.5mm coaxial dc power connector.
BatteryNickel-cadmium rechargeable 8.4V nominalMinimum 13 hours operation after a full charge. Battery chargerExternal sealed moduleInput: 200 - 250V, AC only Available with 3-pin 13A plug or 2-pin European plug (to be specified when ordering) Output: centre pin positive, double-isolated Recharge time 14 - 16 hours for a full charge (eg overnight) |
DimensionsControl unit in leather case with shoulder strap220mm x 110mm x 175mm, 1.55kg
Standard search head (sensing area 120mm long x 60mm wide)
155mm x 88mm face x 40mm depth, 380g
Midget search head (sensing area 60mm long x 30mm wide)
85mm x 52mm face x 49mm height, 110g
Head lead: coiled cable, 600mm rest length, 1.8m extended, 140g
Control unit in leather case including stowed head and lead 220mm x 150mm x 175mm, 2.1kg
Battery charger 100mm x 75mm x 60mm, 400g
Carrying case containing all items 520mm x 370mm x 125mm, 3.7kg
Full SupportProtovale offers its users support bytelephone +44 (0) 1865 821277, fax +44 (0) 1865 820573 and email support@protovale.co.uk
24-hour support on the webProtovale's web site also provides updated product summaries, simple technical support and abstracts of papers on key issues relating to our instuments, and latest news flashes.
Full one year parts and labour warranty
Also available: CoverMaster® CM9 microprocessor cover meter, Rebar Plus bar locator, and Borehole Probe Tendon Duct Locator.
|
Page (text, HTML and images) Copyright © Protovale 1999, 2000, 2001.
I've tried other cover meters, but the Protovale is my favourite. It's accurate, robust and easy to use. The search range is focussed so there's no problem working near scaffolding, and the audio tone lets you concentrate on the area you're working on.
