CP Hunter
The CP Hunter is a portable unit comprising a housing for a customer-supplied remote monitoring device (or a data-collection type of device) integrated with a housing for a reference electrode and the unit incorporates a water delivery system that keeps the soil around the installation moist while maintaining a water bridge between the soil and the internal reference electrode. The unit is designed to be partially-buried in the ground close to a test station that allows electrical connection to be made to a buried pipeline.
As indicated in a Materials Performance article* published by NACE, the primary application of the CP Hunter is to monitor the pipe-to-soil voltage at selected locations over a significant period of time (say, a few days or even a few months) with a view to monitoring any interference phenomena that might be occurring over the time period of the investigation, as indicated by significant changes in the magnitude of the local pipe-to-soil voltage.
Due to the CP Hunter’s unique water delivery system, the unit is particularly well-suited to monitoring pipe-to-soil voltages in dry soil conditions in which conventional reference electrodes may not function optimally.
The CP Hunter is designed to look just like a regular test station in order to not attract any undue attention and expensive remote monitoring equipment, or data-logging equipment, is well concealed inside the non-descript unit. The unit can also be chained to a permanent structure, if locally-available, which enhances the unit’s security.
Specifications:
- Standard Reading Device Chamber (for RMU or Data-Logger): Inside Diameter: 3 inches, Inside Length: 12 inches [other RDC dimension can be specified]
- Main Body (not including the RDC): Length: 55 inches,
Max. O.D.: 4 inches
- Weight (no water added): 10 lbs
- Water Storage Capacity: 6 Liters
- Additional Water Weight (Maximum): 6 kg (13.2 lbs)
- Maximum Operating Time on a Single Charge of Water: 5 months
*Reproduced with permission from NACE International, Houston, Texas.
All rights reserved. Published in the May 2009 issue of Materials
Performance. © NACE International 2009.