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Summary of Contents for Elcometer Protovale 120
- Page 1 Elcometer Protovale 120 Rebar Locator Operating Instructions...
- Page 2 (electronic, mechanical, magnetic, optical, manual or otherwise) without the prior written permission of Elcometer Limited. A copy of this Instruction Manual is available for download on our Website via www.elcometer.com/ downloads.
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Page 3: Table Of Contents
CONTENTS Section Page About your Rebar Locator ............2 Getting started. -
Page 4: About Your Rebar Locator
The Elcometer Protovale 120 Rebar Locator is a world beating product. With the purchase of this instrument you now have access to the worldwide service and support network of Elcometer. For more information visit our website at www.elcometer.com... -
Page 5: Getting Started
2 GETTING STARTED 2.1 FITTING BATTERIES The Elcometer Protovale 120 Rebar Locator uses dry cell batteries only. Sealed alkaline batteries are recommended however rechargeable equivalents may also be used. 4 x LR6 (AA) alkaline batteries are supplied in the kit. - Page 6 2.2 CONNECTING THE SEARCH HEAD Screw the TNC plug of the search head into the socket marked ‘head’ on the front panel of the control unit, taking care not to cross the threads. 12--20mm 2.3 SWITCHING ON/OFF Switch the machine on by turning the ZERO SET rotary control clockwise from the OFF position until it just clicks on.
- Page 7 ZERO SET rotary control can and should then be turned back as required. Note: The needle must be brought to the ZERO mark before using the Elcometer Protovale 120 Rebar Locator to indicate the depth of cover - see “Measuring depth of cover” on page 12.
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Page 8: Using The Instrument
3 USING THE INSTRUMENT The best way to learn how to use your Elcometer Protovale 120 Rebar Locator is to practise on situations where the position and direction of the rebar are known (or visible). Start with the simple case of a single rebar, and then move up in stages through parallel bars, crossed bars;... - Page 9 of the bar can also be found by moving the search head in, first from one side and then the other, and noting in each case where the signal starts; the bar then lies exactly midway between these two points. If the search head is now rotated whilst being held at a constant distance from the bar, the largest signal will be given when the handle is parallel to the bar, but little or no signal when at right angles.
- Page 10 3.3 CROSSED BARS This refers to the common structure of one set of parallel bars running vertically, and a second set running horizontally but not touching the first set. First map out the horizontal bars by holding the search head with the handle horizontal, and scanning vertically along lines which run between the vertical bars.
- Page 11 3.4 WELDED MESH FABRIC This refers to a structure like the previous case of crossed bars, but where the bars are joined at each crossing-point and therefore in electrical contact. This means that every space is now surrounded by a "picture frame" which represents a continuous electrical path, and this results in an additional response which did not occur in any of the previous examples.
- Page 12 To sum up: the maximum signal occurs when the search head is over a bar and the handle is at right angles to the bar; a minimum or null signal occurs when the search head is in the centre of a space between bars, at any orientation.
- Page 13 3.5 LOOSELY-JOINED FABRIC When crossed bars are joined by wires or stirrups, it may not always be obvious whether the bars are in good electrical contact or not, and so may or may not behave as welded mesh (though it usually behaves like separated crossing bars).
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Page 14: Measuring Depth Of Cover
4 MEASURING DEPTH OF COVER The Elcometer Protovale 120 Rebar Locator can also be used to estimate depth of cover over bars of between 12 mm and 20 mm diameter. The range switch and the ZERO SET rotary control now have a more precise significance: •... - Page 15 5 mm. BAR SIZE The Elcometer Protovale 120 Rebar Locator is calibrated for a bar of 16 mm diameter, and this calibration also adequately suits the adjacent sizes of 12 mm and 20 mm. For bar sizes outside this range, the Elcometer Protovale 120 Rebar Locator will overestimate the depth of smaller bars, and underestimate the depth of larger bars.
- Page 16 Over a structure of parallel bars, the cover indication will only be reliable if the spacing of the bars is greater than their depth of cover; as the spacing reduces, so the Elcometer Protovale 120 Rebar Locator will read progressively low. Transverse bars near the point of measurement may also cause the meter to read low, and so the point of measurement should be chosen with care.
- Page 17 the cover is indeed adequate, as long as any effects due to either low battery voltage or small diameter bars have been allowed for. Table 1: Effects of congestion upon cover readings Location Description Effect upon cover reading Unconnected bars Welded mesh fabric Correct correct...
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Page 18: Trouble Shooting
6 MAINTENANCE The Elcometer Protovale 120 Rebar Locator is designed to give many years reliable service under normal operating and storage conditions. No special maintenance is necessary, though the unit should be wiped clean of dirt and moisture after use. -
Page 19: Spare Parts And Accessories
150 mm (6") Extra-Depth Directional Search Coil TW999198E 8 RELATED EQUIPMENT Elcometer produces a wide range of concrete and coatings inspection equipment. Users of the Elcometer Protovale 120 Rebar Locator may also benefit from the following Elcometer products: • Elcometer Adhesion and Bond Strength Testers •...
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