Search Heads - Elcometer Protovale 331 Operating Instructions Manual

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EARCH HEADS

17 SEARCH HEADS

Four types of search head are available for your Covermeter; Standard, Narrow
Pitch, Deep Cover and Borehole Probe. Your Covermeter is supplied with a
Standard search head which will be suitable for almost all your measurement
requirements.
To order any of these search heads see "Accessories" on page 65.
All search heads are fully interchangeable. Changing from one type of search
head to another is quick and easy; simply switch off the Covermeter, swap
search heads, switch on again and zero the Covermeter.
Narrow Pitch Standard Deep Cover Borehole Probe
Figure 26. Search head search fields
Use the Narrow Pitch search head when the reinforcement bars are close
together, i.e. when the pitch of the reinforcement bars is narrow.
Use the Deep Cover head to measure depth of cover over reinforcement bars
deep within the structure. Because the Deep Cover search head only resolves
bars if they are adequately spaced (centre-to-centre pitch more than about 1½
times their cover), for covers shallower than 70 mm, the Standard search head
should be used in preference.
Borehole Probe
The Borehole Probe is used to locate reinforcement bars, tendon ducts and
other metallic objects in the vicinity of holes drilled into concrete. The probe will
also measure depth of cover over a limited range, making it ideal when
attempting to drill through a structure without making contact with reinforcement
bars or tendon ducts. The Borehole Probe is available in two lengths; 400 mm
(16") and 1000 mm (40").
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