TW-6 Pipe and Cable Locator Operating Manual FISHER RESEARCH LABORATORY
CONTENTS SPECIFICATIONS Introduction ...............................................................................pg. 3 Transmitter Receiver Receiver .....................................................................................pg. 4 Operating Frequency..........81.92 kHz +.005%...... 81.92 kHz +.005% Transmitter ..................................................................................pg. 5 Batteries.................................
CHANGING BATTERIES INTRODUCTION Turn the instrument over on its face (position is the same for both transmitter and receiver) and remove access plate with coin or large blade screwdriver. Since 1931, utility and construction craftsmen have looked to Fisher to set the standard of quality in the design and manufacture of locating equipment.
RECEIVER 1. Carrying Strap: Keeps one hand free for marking ground or pavement while using Tracer Probe. 2. Meter: Indicates signal strength up to a point from metallic conductors while locating or tracing. Meter also gives a visual indication of battery strength. 3. Accessory Input: Use this jack to plug in all accessories except the headphones. 4. Sensitivity: A. Toggle switch to select NORMAL or HIGH range. B. Knob to control sensitivity level within the NORMAL or HIGH range. 5.
RECEIVER replaced at the same time. 8. Power: Pull out for ON, push in for OFF. 9. Speaker: Produces the audible signal, which increases in volume and pitch as signal strength increases. The volume and pitch increase even after the meter has peaked at 100. TRANSMITTER 1. Battery Test Meter: Gives a visual indication of battery strength. Battery test is activated automatically when unit is turned ON. 2. Constant Signal/Warble Tone Switch: A.
TRANSMITER 3. Accessory Output: The Ground Plate Assemblies Coupling Clamp or Ground Rod Assembly connects into this jack for a Conductive Trace or Direct Induced Trace. COMPONENT DESCRIPTIONS 1. Ground Rod/Harness Assembly: Provides a “ground” for greatest efficiency in CONDUCTIVE TRACING. For hard ground, the accessory GroundRod /Harness Assembly is recommended. 2. 3-Piece handle: For use in INDUCTIVE LOCATING. 3.
TRACING PROCEDURE MODES OF OPERATION Turn the transmitter ON and turn receiver SENSITIVITY knob all the way up in NORMAL. Then, when the conductor is located, turn SENSITIVITY down to get a precise indication of the location. Use NORMAL for ordinary tracing, HIGH for extended tracing. In the Conductive Mode, you can have Transmitter and Your Fisher Model TW-6 allows two modes of operation: INDUCTIVE and CONDUCTIVE.
MODES OF OPERATION 4. With the Transmitter still on its back, align the two holes in the panel of the Receiver with the knobs. 5. Turn the lower knob of the two knobs until it is “finger-tight”. Turn the knob with the arrow until the spring is compressed and the panel is pulled within 3/8” of the handle at the end. HOW TO TUNE 1. Check batteries on both Transmitter and Receiver. 2. Place the Receiver Sensitivity Switch in the NORMAL position. 3. Turn SENSITIVITY knob to 7. 4.
MODES OF OPERATION CONDUCTIVE TRACING (without handle) The most satisfactory method of tracing when you need to trace an individual pipe when another pipe is nearby is CONDUCTIVE tracing. In the CONDUCTIVE mode, the transmitter energizes the pipe through direct connection. Before attaching the ground rod clamp to the conductor, clean the conductor with a wire brush (this creates a good metal-to-metal contact).
MODES OF OPERATION INDUCTIVE LOCATING (with handle) Use Inductive Locating when you want to find metal objects or locate lost or unknown metal pipes and cables. Walk at a right angle toward what you assume to be the conductor’s position. As you near the conductor, the speaker sound and meter indication will increase. They will reach maximum readings when you are directly over the conductor.
MODES OF OPERATION DETERMININING CONDUCTOR DEPTH BY TRIANGULATION This procedure is only accomplished when the transmitter is close enough for the receiver to receive a strong and clear signal. Once you have determined the exact centerline of the conductor (either Inductively or Conductively), place the receiver above and parallel to it. Hold the receiver as close to the ground as possible.
MODES OF OPERATION INDUCTIVE TRACING (without handle) Use Inductive Tracing as a one-man operation when you know a starting point of the object pipe or conductor. You will maximize signal strength by having the bottom edge of the Transmitter directly over and in line with the conductor you’re tracing. Placing the receiver on its back will give no signal or a “null” directly over the conductor and a signal on either side.
MODES OF OPERATION INDUCTIVE TRACING (without handle) Use Inductive Tracing as a one-man operation when you know a starting point of the object pipe or conductor. You will maximize signal strength by having the bottom edge of the Transmitter directly over and in line with the conductor you’re tracing. Placing the receiver on its back will give no signal or a “null” directly over the conductor and a signal on either side.
MODES OF OPERATION DETERMININING CONDUCTOR DEPTH BY TRIANGULATION This procedure is only accomplished when the transmitter is close enough for the receiver to receive a strong and clear signal. Once you have determined the exact centerline of the conductor (either Inductively or Conductively), place the receiver above and parallel to it. Hold the receiver as close to the ground as possible.
MODES OF OPERATION INDUCTIVE LOCATING (with handle) Use Inductive Locating when you want to find metal objects or locate lost or unknown metal pipes and cables. Walk at a right angle toward what you assume to be the conductor’s position. As you near the conductor, the speaker sound and meter indication will increase. They will reach maximum readings when you are directly over the conductor.
MODES OF OPERATION CONDUCTIVE TRACING (without handle) The most satisfactory method of tracing when you need to trace an individual pipe when another pipe is nearby is CONDUCTIVE tracing. In the CONDUCTIVE mode, the transmitter energizes the pipe through direct connection. Before attaching the ground rod clamp to the conductor, clean the conductor with a wire brush (this creates a good metal-to-metal contact).
MODES OF OPERATION 4. With the Transmitter still on its back, align the two holes in the panel of the Receiver with the knobs. 5. Turn the lower knob of the two knobs until it is “finger-tight”. Turn the knob with the arrow until the spring is compressed and the panel is pulled within 3/8” of the handle at the end. HOW TO TUNE 1. Check batteries on both Transmitter and Receiver. 2. Place the Receiver Sensitivity Switch in the NORMAL position. 3. Turn SENSITIVITY knob to 7. 4.
TRACING PROCEDURE MODES OF OPERATION Turn the transmitter ON and turn receiver SENSITIVITY knob all the way up in NORMAL. Then, when the conductor is located, turn SENSITIVITY down to get a precise indication of the location. Use NORMAL for ordinary tracing, HIGH for extended tracing. In the Conductive Mode, you can have Transmitter and Your Fisher Model TW-6 allows two modes of operation: INDUCTIVE and CONDUCTIVE.
TRACING PROCEDURE TRANSMITER 3. Ni-Cad Recharge: When equipped with Ni-Cad rechargeable batteries, the recharger jack is plugged into this socket. If the red light is lit, proper contact has been made. (NOT available in Europe) 4. Accessory Output: The Ground Plate Assemblies Coupling Clamp or Ground Rod Assembly connects into this jack for a Conductive Trace or Direct Induced Trace. COMPONENT DESCRIPTIONS 1. Ground Rod/Harness Assembly: Provides a “ground” for greatest efficiency in CONDUCTIVE TRACING.
LOCATING NON-METALLIC PIPES One method is to run an electrician’s “fish-tape” or plumber’s “snake” down the pipe and connect the transmitter to it using the ground plate assembly. Attach the ground plate assembly clamp to the tape or “snake” and trace the pipe with receiver or receiver and tracer probe. B lockages in pipes can be located this way too in that the tracing signal will stop where the tape or “snake” ends at the stoppage.
OPERATING HINTS RECEIVER 1. Carrying Strap: Keeps one hand free for marking ground or pavement while using Tracer Probe. 2. Meter: Indicates signal strength up to a point from metallic conductors while locating or tracing. Meter also gives a visual indication of battery strength. 3. Accessory Input: Use this jack to plug in all accessories except the headphones. 4. Sensitivity: A. Toggle switch to select NORMAL or HIGH range. B. Knob to control sensitivity level within the NORMAL or HIGH range. 5.
CHANGING BATTERIES Turn the instrument over on its face (position is the same for both transmitter and receiver) and remove access plate with coin or large blade screwdriver. Lift the battery pack out carefully. Turn the battery pack slightly and unsnap the battery connector. Change all eight batteries. Then reattach the connector to the pack. Slip the battery pack back into its compartment and do battery test. Refasten the access plate.
SPECIFICATIONS Transmitter Receiver Operating Frequency .........81.92 kHz +.005% ..... 81.92 kHz +.005% Batteries................................8 each, AA (NEDA 15) 8 each, AA (NEDA 15) Weight ..................................2 1/2 lbs. (1.1 kg) ......... 3 lbs. (1.36 kg) Sensitivity ..............................N/ANormal: 400 uV typical High: 8 uV typical Signal-to-noise ratio ............N/A ............................................. 110dB Headset Impedance ..........N/A .........................
QUALITY Fisher detectors are renowned for their quality. Each detector is hand crafted in the USA with pride PERFORMANCE The worldwide underground utility industry relys on Fisher. Our instruments are durable, dependable, and locate deeper. REPUTATION Fisher produced the first patented metal detector in 1931. For over 70 years, the Fisher logo has been a mark of excellence. 2 - YEAR LIMITED WARRANTY Fisher believes in the products we produce and backs this belief with a 2 year limited warranty.
