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I.
Model PD Functions
II.
Operation Methods
III.
IV.
Instructions for Unpacking & Inspection
V.
I.
Model PD Functions
A.
Pearson Type Holiday Detector
The Tinker & Rasor Pearson type detector was designed to locate discontinuities, flaws or breaks in the
coating of buried pipelines. This method makes possible the exact location of coating breaks in buried lines without
access to the surface of the coated pipe. Locating electrical discontinuities aids in evaluating the application of a
coating and also these discontinuities can be repaired to eliminate corrosion and to reduce the amount of current
required for cathodic protection.
B.
Short Locator
The apparatus is also effective in locating shorts or undesirable electrical contacts to buried coated pipe.
Such electrical contacts should be removed prior to placing a pipeline under cathodic protection, as these contacts
would drain a large amount of protective potential from the coated pipe.
C.
Pipe Locator
The apparatus can be used very effectively as a pipe locator on coated pipelines that are electrically
connected by a screw or welded joints. This application is particularly effective where it is desired to locate and
follow one pipeline along a right-of-way where there are a number of buried lines.
II.
A.
Pearson Survey Method
The method used to locate discontinuities is that of applying audio frequency AC energy between the coated
pipe and ground. A traverse along the pipeline is made in which the difference in potential is indicated across
approximately twenty to thirty feet of soil above the line. This potential difference is noted in the Receiver. When
Web: www.tinker-rasor.com
Sponsoring members of NACE International, NACE Foundation
P
RODUCT
MODEL PD
PEARSON DETECTOR
FIVE SECTIONS of QUICK INFORMATION
TINKER & RASOR MODEL PD PEARSON DETECTOR
Tel: 833-332-1010
2828 FM 758 New Braunfels, TX 78130
I
NSTRUCTIONS
E-mail: Info@tinker-rasor.com
- 1 -
QMF-570
104-154
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Table of Contents
Related Manuals for Tinker & Rasor PD
Summary of Contents for Tinker & Rasor PD
- Page 1 III. Apparatus Instructions for Unpacking & Inspection Operating Instructions TINKER & RASOR MODEL PD PEARSON DETECTOR Model PD Functions Pearson Type Holiday Detector The Tinker & Rasor Pearson type detector was designed to locate discontinuities, flaws or breaks in the coating of buried pipelines.
- Page 2 Oscillator. The Oscillator will produce 15 watts of 750 Cycle signal into a 500-ohm load with the output selector set at the 100 volt position. NOTE: Model PD-C (Rev. B) uses a new crystal that produces an interrupt frequency at a faster rate than previous models. Users familiar with this instrument may notice the difference.
- Page 3 Receiver. Battery Replacement See photo illustration. 1. Turn PD Instrument off. 2. Locate battery compartment on right-hand side of the instrument. 3. Lift and push compartment door until it opens.
- Page 4 LED lights on the Oscillator show Red. Then move the Fine Adjust knob to the Left (MIN) until the LED lights show Green. NOTE: Model PD-C (Rev. B) uses a new crystal that produces an interrupt frequency at a faster rate than previous models. Users familiar with this instrument may notice the difference.
- Page 5 RODUCT NSTRUCTIONS The traverse along the pipeline is made by walking over the pipe at a slow pace. Beginning adjacent to the Oscillator set the Receiver volume so that the signal from the Oscillator can be heard at a very low level. As progress away from the Oscillator is made, the signal may drop and the level can be raised again by increasing the volume.
- Page 6 RODUCT NSTRUCTIONS Starting at the point directly above the pipe centerline, and keeping the Receiver as close to the surface as possible without scratching it on the ground, move slowly away from the pipe at a right angle, maintaining the Receiver at 45°.
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