Portable reference electrode probes

Fig. 10.31 Portable reference electrode probe, (a) Surveys of electrode potential distribution on ships hulls, submerged offshore pipelines, oilrigs, platforms, jetties and docks are often carried out by manual diver-held probes, (b) These battery-powered devices usually incorporate a tip spike, a silver/silver chloride reference electrode and a digital voltmeter (dvm) within a tough, insulated and sealed pistol. The shroud surrounding the electrode element defines the sensing area. These probes are used to depths of approximately 300 m and are capable of measuring to a precision of 1 mV. Rechargeable Ni-Cd batteries are used. Sharpened tips may be used to penetrate coatings. (Courtesy Corrintec (UK) Ltd.)...

Using a portable ORP meter. Two choices for ORP probes small pocket meters and portable meters with separate probes. Each is a platinum electrode with built-in Ag/AgCl reference electrode. The hand-held meters... 

The successful commissioning and effective use of a cathodic protection system is usually monitored by measuring the spatial distribution of the cathode potential on the structure. This may be achieved via regular ground stations in the case of a buried pipeline (Fig. 10.30) or a portable, heavy-duty reference electrode/digital voltmeter probe (Fig. 10.31) in the case of offshore rigs and platforms. 

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