Gazelle G9320 User Manual

Underground utility locator

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G9320

Underground Utility Locator

User Manual

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Summary of Contents for Gazelle G9320

Page 1 G9320 Underground Utility Locator User Manual...
Page 2: Table Of Contents
CONTENT General descrip/on• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •3 Func/on feature•...
Page 3: General Descrip
1. GENERAL DESCRIPTION PD-6900 intelligent cable and pipe locator is a high performance underground cable and pipe locating and identification system. It consists a transmitter and a receiver, can be used for route tracing, pipe exploration and depth measurement of the underground cables and metallic pipes.It can also be used to identify target cable from a bunch of cables,to do non-metallic pipe route tracing and depth measurement,locate the pipe insulation damage and part type cable fault.
Page 4: Function Feature
1.1 FUNCTION FEATURE: l Multiple function integrated: Route tracing + cable identification +A frame fault location + Sonde mode l Color compass display: underground pipelines are in plain view. l Ultra-high sensitivity: 0.5Hz ultra-narrow bandwidth receiving make device highly anti- interference.
Page 5: Optional Accessories
1.3 OPTIONAL ACCESSORIES l Depth measurement auxiliary sensor: interference indication during depth measurement. l Transmitting clamp: coupling signals to running cables. l Flexible clamp: cable unique identification. l Stethoscope: cable identification for narrow occasions. l Output booster and A frame: Used to locate portion cable faults and pipeline insulation breakages.
Page 6: Device Composition
Charger input: AC100-240V, 50/60Hz. Charger output: DC8.4V, 2A. USB-C port PD fast charge. Volume: 680×120×277mm. Quality: 2.0kg. IP65. Conditions of use: -25℃-60℃, <90%RH, <4500m. 1.5 DEVICE COMPOSITION: 1.5.1 Transmitter: Fig.1-5-1 transmitter appearance Fig.1.5-2 transmitter key buttons 1. LCD display 6. Power on/off button 2.
Page 7 1.5.2 Receiver: Fig.1-5-3 receiver appearance Fig.1-5-4 receiver buttons 8. Power on/off/mute (Set/Cancel ESC 1. LCD display key in menu) 2. Key buttons 9. Calibration key (Menu cancel/long 3. GPS socket press: menu entry and exit key) 4. Earphone socket 10. Mode key (left menu) 5.
Page 8: Standard Accessories
1.5.3 Standard accessories: Item Accessories name Reference fig. and description Transmitter direct connection output cable Grounding rod Earth extension cable Gallium nitride fast charger Dual USB-C charging cable 1.5.4 Optional accessories: Item Accessories name Reference fig. and description Receiver accessories connection cable blue 6-core plug cable Transmitter accessories connection cable red 5-core plug cable...
Page 9: Receiver Informa/On And Menu Secng
1.6 RECEIVER INFORMATION AND MENU SETTING Long press the "Power on,off"/" Mute "button to start, and long press the" Calibration "button to enter the interface of information/menu setting. The keyboard description and display examples are as follows: Fig.1-6-1 receiver information and menu display Note: Long press the calibration key to enter the information/menu interface.
Page 10 Menu item: 1. System function: l Save the setting l Exit the menu interface l English/Chinese switch 2. Memory function: l Send all the saved data through Bluetooth (BT send all) 3. Power frequency: l 50Hz or 60Hz optional 4. Depth unit: l Unit optional m or ft 5.
Page 11: Direct Connection Mode
Note: 1. Selection of power frequency, depth unit and active detection frequency: Menu items marked with an asterisk (*) are enabled items, and items not marked with an asterisk (*) are prohibited items. Press OK button to switch the enabled and prohibit. 2.
Page 12 2.1.1 Direct connection mode connection diagram *Connect the 5-cores red plug into the output socket of the transmitter Fig.2.1.1 Main unit and accessories cable connection diagram 2.1.2 Direct connection mode wiring diagram Connect the red alligator clip with the exposed metallic part of the pipe and connect the black alligator clip with the inserted grounding rod.
Page 13 2.1.3 Interface introduction and pipe voltage measurement Long time press ON/OFF button to power on the transmitter. Device will check accessories automatically and enter the direct connection mode. Under this mode,the device will first test pipe voltage and display on the screen: Fig.2.1.3 Pipeline voltage testing interface If pipe voltage over limitation 50V,device will keep the voltage measurement interface and display the alarming mark as below:...
Page 14: Frequency Selection
Fig.2.1.5 Direct connection interface 2.1.4 Frequency selection Press frequency key to select the transmitting frequency. Six frequencies could be selected: 640Hz, 1280Hz, 8kHz, 33kHz, 82kHz,197kHz. Default power on frequency is 1280Hz.Some frequency selection suggestions: l Common good grounding cable and pipe, suggest to use the default 1280Hz. It can complete most of the testing requirements.
Page 15: Clamp Coupling Mode
2.2 CLAMP COUPLING MODE: This method is used for the naked Pipelines while it is difficult or unable to reach the metal part, and both ends grounded, especially useful for the power cables. Signal transmission of clamp coupling mode equals to a transformer: clamp magnetic core is transformer magnetic core,clamp internal winding equals to transmitter primary,pipe-earth loop equals to secondary (single-turn),transmitter offer primary current, pipe-earth coupling generate secondary current.
Page 16 Make sure that the both ends of the pipe/cable are grounded. The grounding can be continuous grounding (shield grounding) or both-end grounding (high voltage power cable shield grounding at both ends). Different segment of the cable/pipe, or fitting with tube maybe insulated, we need to make them electrically connected, or we can not use this method.
Page 17: Radia/On Mode
2.3 RADIATION MODE: If there is no bald part for the pipe, or detection before excavation,we need to use Radiation mode. The Transmitter use the internal radiation loop to radiate high frequency magnetic (primary), the metal tube-earth loop will induce current, and the induced current will radiate magnetic again (secondary), the receiver can receive secondary magnetic for the pipe detection.
Page 18: Power Adjustment
Can not put the Transmitter on the metal well covering or concrete with steel bar reinforcement, because the signal will be isolated by them. The transmitter will transmit signal not only to the targeted cable/pipe, but also to other medias, so we need to keep some distance between the Receiver and Transmitter. 2.3.2 Interface introduction When transmitter power on,it will automatically enter the radiation mode if no accessories.
Page 19: Signal Transmicng Method For Cable Detec
3. SIGNAL TRANSMITTING METHOD FOR CABLE DETECTION The cable route tracing and the cable identification is very important function of pipe/cable detection. Compared with the single and continuous metal structure of pipe, the cable is composed by several cores and metallic armor. These construction and use differences make signal applying method different and different connection method will make different electromagnetic filed then different detecting result.
Page 20 The current travels from the Transmitter, flows through the core wire and earth at the far end, then travels back to the transmitter. This connection method will make the receiver induce strong signal with clear character for device anti-error tracing indication. There will be strong signal flows through the well isolated conductor, it will not flow to nearby pipelines, especially the crossing metal pipelines, it specially applies to the route tracing under complex environment.
Page 21 3.1.3 Phase-Sheath Method Fig.3-1-3 Phase-Sheath Method As above fig.3-1-3 shows, signal is applied between cable one phase and sheath, short the far end phase and sheath, keep the both ends of the sheath grounded. If there is one cable, the current will flow from the Transmitter to the conductor, and return through sheath and earth.
Page 22 • Fig.3-1-4 Shunt effect of parallel cable Shunt effect of parallel cable • • The Phase-Sheath method is easy to connection, no need to loose the grounding cable. But when multiple cables lay in same path, the signal difference of different cables will not quite different not Shunt effect of parallel cable •...
Page 23: Select Frequency
opposite direction. But the magnetic filed strength is not same because the distance difference, so most parts will be counteracted. The balance parts will be weaken by the metallic sheath shielding effect and at last received by device. Because the twisting, signal will travel long with the cable path and with period and direction variation.
Page 24 The cable current from clamp coupling is small. To strengthen detection effect, we suggest choosing big output level. Fig.3-2-1 Clamp coupling method 1 (to clamp the cable) Clip the cable sheath grounding line This method is useful for detection of ultra high voltage single core live cables. Because it has strong power current flows the cable phase, and it has no three phase offset effect like the three-phase cables.
Page 25 Fig.3.2.3 Null／Ground／Shield Injection Method The cable is live, there is power, the operator needs to be competent to do this work for cable connection. Please do connect the Transmitter at the user end. If inject signal in the transformer end, signal will be injected in all the outlet cable and difficult to distinguish the target cable. The position of the ground rod: it should be at least 5m away from the pipe or cable, and keep the black cable perpendicular to the cable path.
Page 26: Ac/Ve Detec
4. ACTIVE DETECTION Active (source) detection requires the selection of appropriate methods to inject signal to the pipeline as described in Chapters 2 and 3. 4.1 PIPE ROUTE TRACING 4.1.1 Install depth measurement auxiliary sensor (if optional) :If a depth measurement auxiliary sensor is selected, insert it into the corresponding installation position of the receiver as shown in the figure on the right.
Page 27 4.1.3 Setting receiving frequency Press frequency decrease button to select the receiving frequency. Make sure transmitting and receiving frequency is same. Below frequencies for selection: l Complex frequency: 640Hz,1280Hz,support to do error-proof tracking prompts. l Single frequency: 8kHz,33kHz,82kHz,197kHz. If certain required frequencies cannot be switched, long press the calibration key to enter the interface of information and menu setting to enable the required frequencies, as shown in Section 6 of Chapter 1: Receiver Information and Menu Settings (P6-P7).
Page 28: Adjust Gain
l History curve mode: It will record the horizontal coil and vertical coils signal amplitude history curves,and could distinguish the peak value and valid value coincidence or not to find the pipe position.It also will used to detection multiple pipes by passive method.It applies to phase-phase short circuit fault detection.
Page 29 Use Null mode, we can quickly locate the trace, the weakest point is right above the pipe, at the both sides of the cable/pipe, the signal will increases obviously. But because Null mode is easy to be interfered, we need to change to Peak mode after some time to ensure the tracing result. Receiver loudspeaker sound output can reflect the current signal strength,which is helpful to track line, but this function is mainly to serve the users accustomed to using traditional path instrument, and use a compass function, can more quickly intuitive tracking line and generally do not need to...
Page 30 Note: Use the Correct/ Error indication function, the work frequencies should be 640Hz/1280Hz. If use other frequencies, the device will not display the phase dial. At the distance close to the transmitter but not disturbed by it (such as 5-10m), clearly detect the position of the target pipeline.
Page 31 4.1.9 Radiation method For this method, we will need the Receiver and Transmitter, and at least two operators. Please make sure the target zone and the possible directions pipe crossing, set the working mode of the Transmitter to Radiation, and select same frequency for the Receiver and Transmitter. One operator controls the Transmitter and one operator controls the Receiver, keep the direction of the Transmitter and the Receiver perpendicular to the cable/pipe.
Page 32 4.1.10 precise positioning. Compass method will have deviation if interference or nearby pipe effect.If need o do the following to increase the location accuracy, we suggest to use below manual measurement method to verification. Find the target pipeline general position, use PEAK or Valley method and adjust he gain: l Keep the Receiver perpendicular to the suspected cable/pipe, find the position where there is strongest response.
Page 33: Depth Measurement
Operation instruction: 1. Signal amplitude is the signal response of Peak mode 2. On the left is the signal percentage ruler. 3. The upper left is the color indication of the peak value method and valley value method. 4. If the curve is too large and distortion, the gain should be reduced;If too small a curve, should increase the gain.
Page 34: Average Measurement
4.2.1 Average measurement If the depth display is unstable due to various reasons, user can press the measurement key carry out continuous average measurement to get gradually stable and accurate measurement results. After pressing the measurement key , the corresponding position of the key will turn orange, and the average number of times will be displayed.
Page 35 a. Peak and valley coincidence b. Peak and valley non-coincidence Fig.4.2.4 signal distortion example 4.2.5 Compass targeted depth measurement method A.Depth: Use the compass to find the pipeline and shift it to the left until the pipeline shown on the compass is left tangent to the green ring with the smaller target.
Page 36 4.2.6 Wide peak 80% method depth measurement Using the wide peak method, find the point with the strongest signal on the pipeline, long press the gain + key, and the amplitude of automatic gain adjustment is 100%; Then move the receiver horizontally left and right to find two points where the signal amplitude is reduced to 80%, and the distance between the two points is equal to the pipeline depth.The horizontal depth measurement tips below the...
Page 37 Then tilt the receiver 45° and move it to the side of the pipeline until it finds another point B where the signal is the weakest.Then tilt the receiver 45° in the other direction and move it to the other side of the pipeline to find the point C where the signal is weakest.
Page 38: Passive Detec
Attention! In some strict pipeline exploration specifications, no matter what equipment is used, the results of automatic sounding are not accepted, so automatic sounding is convenient but can only be used as a reference. To obtain reliable sounding results, multiple methods are needed to cross- validate! 5.
Page 39: Depth Measurement
AFB provides great convenience for passive detection, but the detection sensitivity is not as good as the frequency division detection. 5.1.2 work mode: Short press the mode key to switch modes:Switching mode, support wide peak, narrow peak and historical curve mode, but AFB full frequency, because the signal amplitude is not displayed, so switching mode has no effect on it.
Page 40: Cable Iden/Fica/On (Op/Onal Func
Average measurement: If the depth display is not stable, can press the measurement key carry out continuous average measurement to get gradually stable measurement results. The value with Angle brackets below the real-time depth is the average depth. 5.2.2 Compass target depth measurement. Use the compass to find the pipeline, shift to the left, until the pipeline shown on the compass is left tangent to the green circle of the target, mark it on the ground;...
Page 41: Accessories Connection
6.1.1 Signal transmitting method l The frequency of receiver must be settled as 1280 Hz or 640Hz. The fault frequency, 1280 Hz, can meet the most test requirement. If the cable is too long, use 640 Hz. l For dead cable, should select the direct connection method, and the best connection is core- ground connection;...
Page 42: Set Reference
6.1.4 Set reference Use the Set. Reference method, we first need to measure the target cable current intensity and phase in known position as reference. Compare the measured result of some point with this reference result to distinguish. The process of measurement and record the result of current and phase is called Set.
Page 43 b. Correct iden+ﬁca+on error Clamp direc+on Clamp direc+on c. Error iden+ﬁca+on a Ref. set Clamp direc+on Fig.6-1-3 Intelligent clamp identification process When setting reference and identifying, the direction arrow of receiving clamp must point to cable terminal and be closed well. The connection of core wire-earth is very complex, but the effective current in the target cable is the most, and less susceptible to interference by neighboring cable.
Page 44: Safety Warning
neighboring cable is I, the phase is at 180° vicinity, identification is error. Because the current is same, the identification is only by the phase, and also should pay attention the clamp direction Example C: the cable is parallel with the target cable, but the path is not same (generally, the terminals are in different position ), the test result is: the current of target cable is I, but the value is smaller than injected, phase is at 0°...
Page 45: Flexible Clamp Current Measurement
6.2 CURRENT MEASUREMENT BY CLAMP Except the 640Hz and 1280Hz, other frequencies only support current measurement but can’t measure the phase or set reference. So can’t use the intelligent identification. But we still can use the current value to distinguish. Refer below fig.
Page 46 Blue Blue Fig.6.3.1 Sensor connection 6.3.2 Interface introduction: After sensor connection, when power on, the receiver will automatically recognize the connected accessories and set as Sensor receiving mode. Reference interface as below Fig.6.3.2: Fig.6.3.2 Sensor identification mode interface The sensor only has the probe coil external, so other operations are exactly the same as using the internal coil.
Page 47: Pipeline Grounded Fault Pinpoin/Ng (Op/Onal Func
At the near end of the transmitter, the sensor can be placed close to the target cable and adjusted to the appropriate gain. When identifying unknown points, the gain should not be adjusted any more, which can accelerate the identification speed and improve the accuracy. Refer below Fig.6.3.3 Fig.6-3-3 Sensor identification 7.
Page 48 7.2 TRANSMITTER INTERFACE INTRODUCTION Power on and the transmitter auto identify the connected accessories.Set the fault locating HV 1Hz mode and the interface as below: Ba3ery level Output status Output frequency Power level Fault loca,ng booster mark Fig 7.2.1 Transmitter fault locating HV rising output interface 7.3 SIGNAL TRANSMITTING First, disconnect all the grounded connection of the pipeline, and keep it in reliable floating insulation.
Page 49 Note: l Selection of grounding bit location: the grounding bit should be hit 5m away from the pipeline, and the black grounding wire should be perpendicular to the direction of the pipeline as far as possible. l Do not connect the ground clamp to the water pipe or other pipelines, otherwise it will interfere with the normal pinpointing.
Page 50: Interface Introduction
7.5 INTERFACE INTRODUCTION After power on,device will automatically distinguish the connected accessories and set as A frame receiving mode, interface as below Fig. 7.5.1 Fig.7.5.1 A frame fault location interface 7.6 CONFIRMATORY TESTS AT NEAR-END Before detection, it is suggested first do the confirmatory test near the stick, and to determine whether this method can be used to detect the fault.
Page 51 Circle Confirmatory Test: If receiving well，according to black near and red far principle,（black near end, red far end），around the grounded rod for one circle，there will be stable response and the arrow always should point to forward Determine the response range: From the near-end of pipeline, start the confirmatory test gradually, the red end of A-frame should point to the pipe terminal.
Page 52 7.7 FAULT LOCATING CONFIRMATORY TESTS From the near-end of pipeline, facing the terminal, red end of A-frame pointing to the terminal, we start the confirmatory test with the same spacing and gain every time. At beginning, because near the earth stick, the signal is strong and stable, the arrow points to forward. With the distance increasing, the voltage is reducing gradually.
Page 53: Cable Fault Pinpointing For Low Impedance And Break Fault
8. CABLE FAULT PINPOINT FOR LOW IMPEDANCE AND BREAK FAULT This chapter is an auxiliary one, read it if needed. When the cable fault impedance is lower, if use the HV impulse current method to locate the fault, the voice of the fault point discharging is weak, especially when the metallic grounded there will be no voice.
Page 54 8.1.3 Attention l For the fault impedance: should be close to 0 with the meg meter measured, no more than 10 Ohm. If over 10 Ohm, should be burned down to low impedance first. If the measurement is 0 with the mega-meter, that doesn’t mean the fault is low impedance fault, must measure with the multi-meter.
Page 55: Phase To Armor Fault Pinpoin
8.2 PHASE TO ARMOR FAULT PINPOINTING 8.2.1 Signal transmitting method For the low impedance grounded fault of phase to armor, we should use one variation connection of inter-phase. As shown in Figure 8.2.1, first we should disconnect the connection between the both ends of cable metal sheath and ground.
Page 56 Fig.8-1-3 break fault testing wiring 8.3.2 Pinpointing method The pinpoint of break fault is the same with ordinary pipeline tracking. Keep the receiver being perpendicular to the cable, using the peak method, starting from the transmitter near-end, gradually move to the remote and detect. Before the fault point, the signal is strong, after the fault point, the signal decreased rapidly.
Page 57: No Armor Cable Phase To Earth Fault Pinpoin
This method is particularly suitable for fault pinpoint of low voltage non-armor cable. For the armor cable, the current will couple to the armor through the distributed capacitor. So the signal will in all the length of cable, and can’t distinguish where the fault happens. For the break merging grounded fault, we suggest using the lower frequency (like 1280 Hz).
Page 58: Maintenance And Warranty
Whether the induction method can be used to pinpoint the grounded fault, it mainly depends on the value of fault impedance. The greater the fault resistance, signal changes before and after the fault more weak, that they can not distinguish. The lower the frequency, intensity changes before and after the point of fault more obvious.
Page 59 In the off state, it takes about 3-4 hours for the transmitter to be fully charged from the undervoltage state. The receiver takes about 1.5-2 hours. Depending on the use and maintenance conditions, the battery pack can generally carry out 300- 500 charge and discharge cycles.