Transcript
BREAK LOCATOR •
Finds breaks in geophone strings or seismic cables
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Pinpoints breaks within 1 inch, including those inside the geophone case
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Can be used to locate geophone takeout pair.
description & application The Break Locator pinpoints breaks in any unshielded cable including geophone strings and multi-pair seismic cables. Users can quickly find breaks which are normally difficult and time consuming to detect (i.e. broken wires within a geophone case).
break within one (1) inch. This accuracy in detecting a signal also allows users to trace wires within a spiral wrap cable to a point where they are closest to the outside jacket of the cable. This is useful for locating tie-ins for geophone take-outs.
Operation is simple and requires no specialized operator interpretation. Each Break Locator consists of two hand held units, the Oscillator Unit, which injects a signal into the cable, and the Detector Unit, which is used to trace the signal down the cable.
The Break Locator is designed as a rugged, take-anywhere unit. Readily available 9-volt transistor batteries satisfy power requirements. The Break Locator requires no specialized knowledge to pinpoint the exact location of a break in a wire. The system is effective with either multi-pair seismic cables or single pair geophone strings.
Sensitivity of the detection scheme used in the Break Locator allows the operator to pinpoint a
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operation
Seismic Cable Operation The broken wire is connected to a red binding post on the Oscillator Unit front panel. On the other end of the cable, the operator places an overall shorting plug which shorts every wire (including the broken wire) together. A connection is made from this shorting plug to the black binding post on the Oscillator Unit. The Detector Unit is equipped with a coaxial cable antenna which picks up the signal generated by the Oscillator Unit. Before tracing the selected wire, the operator calibrates the Detector Unit meter to a center scale reading. As the antenna is moved along the cable jacket, the meter reading will move from side to side as the wire rotates within the spiral cable wrap. The meter drops to a steady low level reading when the break is passed. By passing the Detector Unit antenna back and forth over the suspected break, the operator can pinpoint the exact location.
Geophone String Operation The geophone string take-out is connected to the Oscillator Unit’s dual binding post. A connection must also be made between the black post on the Detector and Oscillator Units. The Detector Unit coaxial antenna is moved along the geophone string as in the procedure for a seismic cable. Before moving the antenna down the string, the front panel meter is calibrated to a center scale reading. As the antenna then moves along the cable jacket, the meter shows little movement. When the break is passed the meter shows a marked increase or decrease in signal level (depending on which wire is broken in the serial/parallel combination). The break can then be pinpointed by passing the antenna back and forth across the suspected location.
specifications Size: 6 x 3¼ x 2 inches (15.2 x 8.3 x 5 cm) 7 x 4½ x 2½ inches (17.8 x 10.8 x 6.4 cm)
Oscillator: Detector:
Oscillator: Detector:
Oscillator: Detector:
Weight: 1 lb (0.45 kg) 2 lbs (0.9 kg)
Power Requirements: Two 9-volt transistor batteries Two 9-volt transistor batteries A121059
macha international, inc. p 1-713-723-5040 call toll free at 1-866-386-8085 fax:1-713-723-8452 e-mail:
[email protected]; www.macha.com
