JANUARY 31 2003
Table 4-5. Water Tank Calibration CP System Component Tests
CP SYSTEM TYPE
Measure anode-to-structure current using (in order of preference) a clamp-on
milliammeter, a multimeter measuring millivolts across a calibrated shunt, or a
multimeter connected in series measuring milliamperes.
Perform the rectifier operational checkout (paragraph 4-5).
Calculate the rectifier efficiency by dividing the calculated
output DC power by the factored input AC power.
Table 4-6. Water Tank Calibration Potential Measurements
POTENTIAL MEASUREMENT LOCATIONS
Position the reference cell near the water surface, at mid-depth and at
the bottom in the following locations:
Next to the tank wall directly adjacent to each anode string.
Next to the tank wall midway between two adjacent anode
Locate the reference cell:
Two inches above the tank bottom directly beneath each
Two inches above the tank bottom and as far away from the
anode strings as possible.
Locate the reference electrode adjacent to the riser wall at intervals of
(Elevated Water Tanks)
1.5 meters (5 feet) from the top to the bottom of the riser.
Measure and compare the potential of each permanent cell to a portable
reference cell to determine its accuracy.
Annotate the water level for comparison to past and future
For all tanks, compare potential measurements to measurements previously