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26

If you find a pivot angle at which the meter reading picks up again, it means you've located a bend and can 
resume tracing in the new direction. 
 
If you pivot all the way around (360 degrees), without getting any noticeable meter reading, it means 
you've reached a dead end. 
 

5.9 Valves, Manhole Covers, Tees and Risers 

 
If the meter reading suddenly increases and then falls back while tracing a pipe you have probably passed 
over a buried valve, manhole cover, tee, or riser. 
 

5.10  Common Bonded Conductors 

 
Telephone, power, and CATV sometimes use a common ground bond.  If other conductors are connected to 
your target conductor, putting a signal on the target can cause all the conductors to carry the same signal, 
making it difficult to identify the target conductor. 
 
To verify that you are tracing the targeted conductor, note the field strength at a known location of the 
conductor.  As you trace, any change in field strength should be gradual. If either reading changes abruptly 
you are probably no longer over your targeted conductor. 
 

5.11  Congested Areas 

 
If you suspect that coupling from adjacent conductors is causing interference in the signal picked up by the 
Receiver try increasing the strength of the signal received from the Transmitter and decreasing the strength 
of signal from the interfering conductors by: 
 
1   Changing to a different transmitter coupling point or coupling mode. 
 
2   Improving the grounding connection or moving the grounding point. 
 
3   Determine the location of the adjacent conductors.  Then check to be sure that neither the direct connect 
cable or the ground cable cross over any of the adjacent conductors.  Re-position them if necessary. 
 
4   If you are using the Inductive (Indirect) mode, you may be able to decrease the amount of interfering 
signal by changing the orientation of the transmitter to the targeted conductor.  Determine the location of 
the interfering conductor. 
 
 

5.12  Pipes with Insulated Junctions 

 
The high radio frequency signal of the 480BB Pipe and Cable Locator will jump pipe insulators, however, 
the signal will proportionately decrease each time it crosses an insulator. When possible, such as when 
tracing a pipe with a meter, bypass the meter (insulator) by using a jumper cable.  Attach each end of the 
jumper cable on opposite sides of the insulator. 
 

 
 
 
 
5.13  Metroclamp Ground Requirements 

 
If you are using the Metroclamp around a cable, both ends of the target conductor must be grounded to 
insure sufficient field strength.  Power lines and telephone sheaths are assumed to be grounded. 
 

5.14  Grounding Safety 

Содержание 480B

Страница 1: ...e TN 37217 Dr Herbert Iann St 6 800 446 3392 800 624 6210 96148 Baunach Germany 408 734 1400 Direct 615 366 7323 Direct 49 9544 680 408 734 1415 Fax 615 360 9855 Fax 49 9544 2273 Fax www metrotech com nashville metrotech com service sebakmt com sales metrotech com Warranty One year Specifications Subject to change without notice ISO 9001 2000 Certified Copyright 2008 All Rights Reserved Rev 12 18 ...

Страница 2: ...elines of ISO 9001 2000 and ensures quality in its design development production installation and servicing disciplines Metrotech Corporation 2003 2008 Metrotech Corporation 3251 Olcott Street Santa Clara CA 95054 USA Tel 1 800 446 3392 1 408 734 1400 Fax 1 408 734 1415 E mail sales metrotech com Internet www metrotech com Revision B 12 18 2007 ...

Страница 3: ...d Surveys and Metal Mass Location 18 4 8 Conductor Identification Using a Second 4820 Metroclamp 20 4 9 Marking the Conductor 21 5 Tracing Factors and Helpful Information 22 5 1 Soil Conditions 22 5 2 Field Strength of the Signal 22 5 3 Verifying Versus Tracing 22 5 4 Adjacent Conductors 22 5 5 Deep Conductors 22 5 6 Tracing Long Runs 23 5 7 Locating a Service Lateral 23 5 8 Locating a Bend or Dea...

Страница 4: ... Receiver Response 14 4 4 Inductive Coupling with the 4 Metroclamp 15 4 5 Estimating the Depth of a Conductor 17 4 6 Estimating Conductor Depth with the 4810 Probe 18 4 7 Depth Estimation Allowing for Uneven Ground 18 4 8 Carrying Handle Assembly 19 4 9 Mounting the Transmitter and Receiver onto the Carrying Handle 19 4 10 Adjusting for Audio Balance 20 4 11 Position of Metroclamps When Using Two ...

Страница 5: ... signal travels along the conductor becoming weaker as it gets farther away from the Transmitter The distance that the signal travels before it becomes too weak to be detected depends on the method of connection the type of conductor the surrounding soil and the depth of the conductor When you position the Receiver over the targeted conductor it will detect the signal from the conductor enabling t...

Страница 6: ...pright standing operation 183045 Headset For use when locate site is too noisy for audio tone 200766 Carrying Handle For use when mass metal or blind searching SON834 Sonde For tracing non metallic pipe or conduit 500C071 Carrying Case Protective ABS material 600A030 VHS Video Tape Training Tape 600A051 VHS Video Tape SECAM PAL NTSC Tape depicts basic training procedures with the Metrotech 480 Pip...

Страница 7: ...sions 11 63 L x 9 H x 3 13 D 29 5cm x 23 cm x 8 cm Weight 3 5 lb 1 6 kg 480B Receiver Active Operating Mode Nominal Sensitivity at loop for 50 meter deflection Lo Range 30 microvolts p p Hi Range 2 microvolts p p Sensitivity at AUX INPUT Increase Over Loop 20 with 4810 Inductive Probe 375 with 4820 Metroclamp 50 60 Power Line Locating Mode Frequency 50 60Hz Antenna Mode Peak responding gradiometer...

Страница 8: ...nd up Dimensions 11 63 L x 9 H x 3 13 D 29 5 cm x 23 cm x 8 cm Weight 4 5 lb 1 9 kg Both Transmitter and Receiver Operation Temperature 4 F to 122 F 20 C to 50 C Shipping Weight 14 lb 6 kg Shipping Dimensions 19 L x 14 H x 9 5 D 48 cm x 35 6 cm x 24 cm Modes of Operation Direct Connection Inductive Coupling Inductive Indirect ...

Страница 9: ...teadily if battery power is good will slow down according to power left in batteries When it stops blinking replace the batteries 2 PUSH PULL POWER SWITCH Pull this switch to turn the Transmitter on Power Indicator lamp will blink 3 COND AUX OUTPUT JACK Insert either the direct connect cable or the 4820 Metroclamp cable into this jack The Transmitter s internal antenna is automatically disconnecte...

Страница 10: ...to be replaced 2 SENSITIVITY KNOB Controls the signal gain Set as low as possible to avoid receiving signal from conductors other than your target conductor 3 RANGE KNOB Changes the ratio of the signal amplification 4 DEPTH ANGLE BUBBLE Position the bubble in the indicated area to estimate the depth 5 HEADPHONE JACK Plug in point for headphones 6 CARRYING HANDLE THREADED BUSHINGS Connection point ...

Страница 11: ...50 60Hz Power Mode 1 Test the Receiver only the Transmitter is not required for passive locating Stand under an indoor AC powered light future 2 Set the Range to HIGH and the Sensitivity to the 12 o clock position 3 Hold the Receiver in a vertical position and raise the Receiver upward toward the light fixture The meter reading and audio tone should increase as the Receiver gets closer to the ligh...

Страница 12: ...ally used to follow the path or direction of a line It is the preferred method for general locating because the sensitivity or gain can be kept to a minimum which prevents bleed off onto nearby lines The NULL method is used for more accurate locating of the centerline of a conductor You would want to get an accurate locate of a conductor centerline before determining the depth of a conductor PEAK ...

Страница 13: ...ther away from the Transmitter you will need to increase the sensitivity It is important to tune the sensitivity as low as possible in order to sharpen the reception and reduce signal bleed off onto adjacent conductors 7 Set the Receiver RANGE knob to NORM adjusting to HIGH when necessary 8 When starting a locate you need to prelocate the targeted conductor by using the broad range PEAK method fir...

Страница 14: ...t location of the conductor See Figure 4 3 Figure 4 3 Null 480B Receiver Response DO NOT HOLD THE RECEIVER AT AN ANGLE INCORRECT INFORMATION WILL RESULT 9 To determine the direction of the conductor stop and vertically rotate the receiver to the left and right The highest signal strength reading indicates the direction of the conductor Continue to trace the conductor in the direction indicated by ...

Страница 15: ...ls When tracing lines that have insulators the insulators should be bypassed using the supplied jumper cable 1 With the Transmitter OFF plug the 4820 Metroclamp cable into the COND AUX jack on the 480BB Transmitter 2 Place the Metroclamp around the conductor below the electrical ground See Figure 4 4 Make sure that the clamp jaws are completely closed Figure 4 4 Inductive Coupling with the Metrocl...

Страница 16: ... the line must be loaded This method gives a maximum loud tone signal The 480B Receiver is held in a vertical position at right angles to the line for maximum signal Note the logical path of the line from the source You will notice a difference audio tone when using the 50 60Hz mode this is normal 50 60 Power Line Locating Operation 1 Move the 480B Receiver a few feet away from where you want to s...

Страница 17: ...LL method find the exact location of the conductor At a minimum distance of 35 feet from the transmitter to prevent air coupling between the transmitter and receiver locate and mark the conductor 2 Then still in the same mode of operation NULL tilt the Receiver to 45 degrees aligning the bubble and move off to the side of the conductor See Figure 4 5 Figure 4 5 Estimating the Depth of a Conductor ...

Страница 18: ... turn the RANGE to HIGH The thumb knob on the 4810 Probe will then control the 480B Receiver sensitivity 4 Turn the 480B Receiver MODE SWITCH to ACTIVE 5 Adjust the 4810 Inductive Probe SENSITIVITY as needed keeping it as low as possible to sharpen the Receiver response 6 Use the same triangulation procedure as described in Section 4 5 Estimating the Depth of a Conductor Tilt the 480B Probe to a 4...

Страница 19: ...rying Handle 1 Assemble the Carrying Handle as shown in Figure 4 8 Do not insert the end pieces beyond the stop pins Secure the screws on the center section Figure 4 8 Carrying Handle Assembly 2 Mount the 480B Transmitter onto the Carrying Handle by placing the single screw end of the handle into the Transmitter and securing it to the Transmitter with the handle screw See Figure 4 9 Step 1 3 Place...

Страница 20: ... be positioned exactly perpendicular to the Transmitter The operator must be a least 15 feet from all metal objects pipes fences cars etc Hold the instrument at arms length parallel to the ground with the Receiver facing up as shown in Figure 4 10 First turn the topmost knob clockwise until full tone is indicated and the spring is compressed Then turn this same knob in a counterclockwise direction...

Страница 21: ...be operated in the Inductive Mode using a systematic grid approach Looking for a metal mass such as a manhole cover or steel drum is the same as a blind search with the exception that the search paths need to be closer together so as not to miss the metal object A ground survey is a process by which an operator can locate all the underground conductors within a particular area 4 8 Conductor Identi...

Страница 22: ... red communication lines cables conduits CATV orange gas oil petroleum or other gaseous materials yellow storm and sanitary sewers drain lines green water irrigation or slurry lines blue Note If you have any questions regarding marking requirements or procedures please call your local One Call Center 5 TRACING FACTORS AND HELPFUL INFORMATION Many variables affect the process of locating a pipe or ...

Страница 23: ... when tracing 5 4 Adjacent Conductors When the meter reading drops off more on one side of the conductor than it does on the other the Receiver may be picking up interference from an adjacent or parallel conductor Adjust the sensitivity to compare the signal strength of the conductors In most cases the conductor with the stronger signal is the target conductor If you are using the Active Mode conf...

Страница 24: ...ing the Receiver as if to trace over and parallel to the main Operator 2 carrying the Transmitter holding it perpendicular to the main line and maintaining a minimum of 100 ft between himself and the Receiver walks parallel but 5 feet from the main on the side he expects to find the service laterals as shown in Figure 5 1 The meter reading on the Receiver will increase as Operator 2 crosses over t...

Страница 25: ...ry increasing the strength of the signal received from the Transmitter and decreasing the strength of signal from the interfering conductors by 1 Changing to a different transmitter coupling point or coupling mode 2 Improving the grounding connection or moving the grounding point 3 Determine the location of the adjacent conductors Then check to be sure that neither the direct connect cable or the ...

Страница 26: ...the Transmitter and Receiver batteries as follows 1 Have ready 6 C Cell batteries 2 To test the Transmitter batteries pull the power switch on The LED will blink steadily if the batteries are in good condition It will begin to slow down as the batteries lose power If it does not blink at all the batteries need to be replaced 3 To test the Receiver batteries turn the Range Knob to NORM The needle o...

Страница 27: ...lve Box Locators 50 60Hz Detectors and a variety of transmitting sondes and flexi sondes COPYRIGHT NOTICE The information contained in this document is for informational purposes only and is subject to change without notice Metrotech Corporation makes no warranty of any kind with regard to the information contained in this manual including but not limited to the implied warranties of merchantabili...

Страница 28: ...an those approved by Metrotech Warranty does not include batteries Expendable items such as fuses and lamps are excluded Any detection product proved defective under this warranty will be repaired or replaced free of charge at the Metrotech Corporation factory or approved Metrotech repair station The equipment should be returned to our factory by prepaid transportation after requesting and receivi...

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