Tinker & Rasor Mark V Ranger User Manual

Tel: [phone] Fax: [phone]

P. O. BOX 1667 SAN BERNARDINO, CA 92402

Web: www.tinker-rasor.com E-mail: [e-mail]

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Sponsoring members of NACE International, NACE Foundation

QMF-570 007-118

PRODUCT INSTRUCTIONS

MODEL MARK V RANGER

FIVE SECTIONS of QUICK INFORMATION
I. AUDIO FREQUENCY

II. OPERATING METHODS
III. APPARATUS
IV. INSPECTION of INSTRUMENT
V. OPERATING INSTRUCTIONS

OPERATING INFORMATION

I. Model Mark V Ranger - Audio Frequency

A. Pearson Type Holiday Detector
The Tinker & Rasor Mark V Ranger set on audio frequency position 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 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 a 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 which are

electrically connected by screw or welded joints. This applications 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. Operating Methods

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

Tel: [phone] Fax: [phone]

P. O. BOX 1667 SAN BERNARDINO, CA 92402

Web: www.tinker-rasor.com E-mail: [e-mail]

- 2 -

Sponsoring members of NACE International, NACE Foundation

QMF-570 007-118

PRODUCT INSTRUCTIONS

potential is indicated across approximately twenty to thirty feet of soil above the line. This potential

difference is noted in the receiver. When an area is reached where the difference in potential is

considerably greater than the average potential over the pipe, a discontinuity is assumed to lie

under this area.
B. Method of Locating Shorts
The method of locating shorts or contacts on a coated pipe is that of applying AC audio-frequency

energy between the pipe and a remote ground connection. A traverse is made along the pipeline

with a receiver equipped with a search coil. A short or contact is observed along the traverse where

the average AC signal picked up over the line suddenly drops to a very low level. This is assumed

to be a point directly above the contact.
C. Method of Locating Pipe
An audio-frequency AC signal is placed between the coated pipe and a good ground connection.

The receiver, containing a search coil, is passed over the area where the pipe is assumed to be

located. As the receiver is moved back and forth in a horizontal plane over the pipe, a sharp null

will occur in the received signal. The pipe to be located is assumed to be directly under this null.

A well coated pipeline can be followed for a great distance by this method.

III. Apparatus
The complete apparatus furnished with the Mark V Ranger Detector comprises the following:
A. Receiver with battery*

B. Transmitter with battery*
C. Headphones, Stereo
D. Shoe Cleats
E. Connecting Cables
F. Terminal Boards
G. Carrying Case

*Note: Li-Ion battery may be purchased as an optional accessory.
The Transmitter/Oscillator set on the audio-frequency position has been designed to use the latest

developments in this type of instrumentation. A digitally synthesized circuit, the Transmitter/Oscillator
converts low voltage DC to stable audio frequency AC directly by a highly efficient method.
A. Transmitter/Oscillator

In order that a maximum of energy can be transferred from the Transmitter/Oscillator to the pipe,

the output of the Transmitter/Oscillator is provided with automatic impedance match to the load.

An interrupter is provided to make the signal more easily recognized. The interrupter is actuated

by turning the Conductive/Inductive switch to the pulse position on the Transmitter/Oscillator.
B. Receiver