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5 (2 Reviews) | Model: Tinker & Rasor CPV-4
Voltmeter, Complete W/ Half Cell Digital Meter
Your Price: $325.00
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The Tinker & Rasor CPV-4 Digital Cathodic Protection Voltmeter is used for measuring D.C. potentials between a reference electrode and a structure. It has an input resistance of 20 megaohm and two voltage ranges, 0-2v DC and 0-20v DC. The CPV-4 is a great choice for all CP testers and includes one 6A Copper Sulfate reference electrode, which can also be substituted for 2A, 6B, 8A or 8B.
The Model CPV-4 has a connection for the half-cell to screw into the back of the voltmeter. When using this option, the half-cell is connected to the Positive (+) side of the voltmeter. A test lead is then connected between the Negative (-) post of the voltmeter and the structure. This setup is used by many companies and technicians, as a "good" read, for instance 0.85v, is displayed as a positive number. Many companies and technicians like to use positive numbers in recording reads. Also, an analog meter may not display a negative reading, so companies or technicians who have both digital and analog meters have standardized using this method.
However, there are some groups that teach a different connection method. NACE International and Peabody's Control of Pipeline Corrosion, for example, both suggest connecting the Negative (-) terminal to the half-cell, and the Positive (+) to the structure. This would then change the polarity of the reading, so that the same reading as given in the previous example would then be displayed as -0.85v. To connect the Model CPV-4 CP Voltmeter using the NACE / Peabody method, do not screw the half-cell into the voltmeter. Use both lead cables provided, connecting the Red (+) cable between the structure and the Positive (+) terminal on the voltmeter, and the Black (-) cable between the half cell and the Negative (-) terminal on the voltmeter.
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They work well for our Propane Business
5.0
We have purchased several of these over the past 3 years. Barring accidents, they function well and are durable. They are simple and easy to use, and less time consuming than a multimeter for which you need a Cell also which these come with.
Barry Lochridge on Sep 29, 2023 I found this helpful (0)
Nice upgrade from older version
We had an older version of this instrument that lasted over 20 years and is still working. This newer version is a nice upgrade, very easy to use and appears to be durable as well. Great product for the price.
KELLI NEIBERGER on Oct 10, 2022 I found this helpful (0)