Cathodic Protection Digital Voltmeter
- Hand Held Instrument
- LCD digit display
- 20 Meg Ohm Impedance
- Filter AC Interference
- Heavy Duty Coiled Leads with Clamps
- Works with T&R Reference Electrodes: 6A,6B, 8A, 8B
- Storage Case
- Durable die-cast aluminum case
- Powder coated finish
- Integrated circuits
- (1) 9 Volt Battery
- Leads with Clamps
- Come with (1) 6-A Reference Electrode or your choice (See Electrodes Page)
- Case with Foam Insert
- Instructions Manual
The CPV-4 is a DC digital voltmeter with a input resistance of 20 meg ohm and two voltage ranges.
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The CPV-4 is a DC digital voltmeter with a input resistance of 20 meg ohm and two voltage ranges. The first range is zero to two volts and the second is zero to 20 volts. The CPV-4 includes one Copper-Copper Sulfate Half Cell Electrode of your choice 2A, 6A, 6B, 8A or 8B. This is a great choice for all CP testers.
The Model CPV-4 CP Voltmeter has two ranges; +/- 2v DC and +/- 20v DC.
High input impedance for most CP applications.
Do not use this instrument in an explosive environment.
The Model CPV-4 Digital Cathodic Protection Voltmeter is used for measuring D.C. potentials between a reference electrode and a structure.
Check all components against packing list. If damage has occurred in shipment, file a claim with the carrier immediately. If it is necessary to contact your supplier or the manufacturer concerning damaged or missing items, be sure to include all the information, such as serial number, purchase order number, and invoice number. This will assure you of obtaining proper and expeditious service.
2. PREPARATION OF HALF-CELL
Please note that in most cases the half-cell is shipped dry, and must be properly charged with distilled water before operation.
3. OPERATION WITH HALF-CELL ELECTRODE ATTACHED
- Remove protective vinyl cover from end of half-cell electrode.
- Place ceramic end of half-cell in contact with moist earth.
- Connect test lead from negative terminal on instrument to the structure.
- Observe and record meter reading. Note: No switch to push for taking reading once the voltmeter has been turned on.
4. DIFFERENCES BETWEEN METHODS OF CONNECTION
The Model CPV-4 has a connection for the halfcell to screw into the back of the voltmeter. When using this option, the halfcell 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.
5. OPERATION WITHOUT HALF-CELL ELECTRODE
Use same as any standard voltmeter for measuring D.C. potentials.
6. BATTERY TEST
Battery has a shelf-life, and needs replacement when the display numerals begin to flash on and off.
7. BATTERY REPLACEMENT
See the photo below. Click on photo to enlarge.
- Remove the four screws on the face panel using a Phillips-head screwdriver.
- Be mindful of the wires connecting the face panel to the chassis.
- Replace the 9 volt battery with an alkaline equivalent. T&R #010-007
- Reverse the steps to return the instrument to operational status.
Warranty is on workmanship and material for 90 days from date of purchase. Warranty does not cover transportation or damages beyond normal wear and tear.
9. NON-WARRANTY REPAIR POLICY
Tinker & Rasor will repair any repairable past-warranty Model CPV-4 (instrument only) for a charge not to exceed50% of current list price for a period of three years from date of sale.
10. SHIPPING INSTRUCTIONS
All instruments being returned for repair should be sent PREPAID to either address below:
Ship Via Courrier (UPS, FedEx, DHL, etc)
Tinker & Rasor
791 S. Waterman Ave.
San Bernardino, CA 92408
Ship Via US Postal Mail
Tinker & Rasor
PO BOX 6890
San Bernardino, CA 92412-6890
Include with shipment information the nature of the problem, purchase order, serial number and return delivery address, phone and fax numbers. Immediate service is guaranteed!
- Tech Data
- Recommended Annually
- 4-5/8" x 3-5/8" x 2-3/16"
- 0-90o C / 0-194o F
- CPV-4 Parts List
Parts & Accessories:
- #085-086 CPV-4 Instrument - US$325.00
- #026-028 Cable Assembly (1Blk-1Red) - US$44.28
- #029-130 Storage Case - US$44.28
- #085-078 6A Half Cell Electrode - US$55.00
- #177-056 Extension Handle (6 Series Half Cells) - US$55.00
- #177-057 Extension Handle (2A Half Cell) - US$50.00