Aka Signum MFT 7272M version 100c User Manual
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Discriminating Metal Detector
Signum MFT
7272М
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thoroughly.
Instruction Manual
Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. 2 ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected]
Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected] 3 Contents GENERAL INFORMATION--------------------------------------------------------------------------------------------------4 GENERAL DESCRIPTION OF THE DEVICE---------------------------------------------------------------------------4 PACKAGE CONTENTS------------------------------------------------------------------------------------------------------5 TECHNICAL SPECIFICATIONS---------------------------------------------------------------------------------------------5 GETTING STARTED----------------------------------------------------------------------------------------------------------6 POWER SUPPLY-----------------------------------------------------------------------------------------------------------------6 CONTROLS AND CONNECTIONS ---------------------------------------------------------------------------------------7 DISPLAY SCREEN--------------------------------------------------------------------------------------------------------------9 SENSITIVITY CT, PB SENSITIVITY / CT VOLUME----------------------------------------------------------------9 GROUND BALANCE--------------------------------------------------------------------------------------------------------10 DISCRIMINATION SEARCH MODE AND SETUP-------------------------------------------------------------------14 SEARCH MODE “ ALL METAL “----------------------------------------------------------------------------------------15 DYNAMIC AND STATIC MODES OF OPERATION------------------------------------------------------------------16 MODE “TURBO”-------------------------------------------------------------------------------------------------------------17 MODE “ECONOMY”--------------------------------------------------------------------------------------------------------17 MODE S ALGORITHM------------------------------------------------------------------------------------------------------17 MULTI-FREQUENCY-------------------------------------------------------------------------------------------------------18 PARAMETER MENU--------------------------------------------------------------------------------------------------------19 ADDITIONAL MENU (ADD. MENU)-------------------------------------------------------------------------------------22 USER PROGRAMS----------------------------------------------------------------------------------------------------------23 USING THE HODOGRAPH FOR IDENTIFICATION --------------------------------------------------------------25 SEARCHCOIL REPLACEMENT -----------------------------------------------------------------------------------------26 SEARCH AND IDENTIFICATION METHODS -----------------------------------------------------------------------26 SEARCHING FOR LARGE/ FLAT NON FERROUS TARGETS WITH A HIIGH VDI ANGLE ------------------------------------------------------------------------------------------------------------------30 EXAMPLES OF SOME COMMON TARGET VDI’s-----------------------------------------------------------------32 WARR ANTY INFORMATION --------------------------------------------------------------------------------------------------------------------------------------------------------------33 QA/QC CERTIFICATE------------------------------------------------------------------------------------------------------34
Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. 4 ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected] GENERAL INFORMATION Metal detector SIGNUM MFT 7272M is designed to search for and identify metal objects in the dielectric (dry sand, wood, etc.) and low conducting media (soil, brick walls, etc.). Some applications of use are: • Criminal; • Engineering; • Housing and community services, construction and fire-fighters to search for underground utilities, pipelines, cables, manhole wells etc. • Archaeology and treasure search. The device is designed to operate under the following conditions: Ambient temperature from -20 up to +50°c (-4 to 122 F); Relative humidity up to 98 per cent at temperature of 25°c (77 F); Atmospheric pressure from 630 to 800 mm Hg. 0BGENERAL DESCRIPTION The Signum MFT 7272M is an eddy current selective metal detector that works on the principle of induction balance. The main distinguishing feature of this model is the use of its original software and hardware. Our multi-frequency technology (MFT) allows the use of any search coils manufactured by us, regardless of their operating frequency (Hz). That is, the device itself will make adjustments and calibrate to the selected coil. The device uses the original technology of signal processing sensor-technology space and harmonic filtering (SFT), minimizing the hindering effect of ferrous soil (salinity) and, thereby, increasing the reliability of the identification of deep and small objects. Basic search mode – Dynamic search mode, i.e. detection of an object occurs with constant motion of the search coil. To pinpoint the exact location of the detected object the device has a static mode of operation (Pinpoint). The device has 2 methods for identifying the object detected: -Audio programmable multi-mode, -Visual (Hodograph, VDI value, rating (level) signal-RS). The device has two independent search channels: RT and ST. The RT channel (real time) works in real time, i.e. sound indication is given simultaneously with the movement of the search coil over the object. Sound indication in this channel is a single-tone signal, volume and frequency of which can change when an object approaches the search coil. Also using the duration of the tone we can get an estimate of size of the target detected. When the received signal from an object exceeds the specified RT threshold, the channel generates the ST audio or short tone. Channel ST (short tone) is the audio identification channel for the type of object detected. When the received signal exceeds the threshold of the RT channel the detector issues a short audio tone (ST), and the screen displays the hodograph (vector time curve) of the detected object. The frequency of the short tone indicates the type of object detected (high tones – non ferrous metal, low tone - ferrous metal). The number of tones can be specified by the user (the default is 4 tones).
Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected] 5 Each channel has an independent adjustment of its sensitivity. The sensitivity of the RT and the sensitivity of ST. The RT channel has a higher sensitivity than the ST channel and its main objective is to locate the object and alert the operator that there is something there. The Signum MFT 7272M is equipped with mode (Turbo). This is a high coil current mode, which is used to improve response from good signals at depth. There are also 4 custom user programs. The detector is equipped with a manual or automatic ground balance system with the ability to adjust auto track rate (APB). PACKAGE CONTENTS • The electronic unit with a telescopic pole 1 ea. • Search coil - eddy current transducer (ECT) 1 ea. • Magazine for 6 batteries (type AA)* 1 ea. • Operators Manual 1 ea. • Headphones** 1 ea. • Carrying Bag** 1 ea. *) batteries sold separately **) purchased separately or as an option. TECHNICAL SPECIFICATIONS The maximum detection range of metal objects (air test with coil Ø260mm DD) via RT: • 25 mm dia. coin - 60 см (23.5 in); • Helmet - 150 см (59 in); Display modes: • Audio, 5 modes (RT, RT-M, RT-ST, RTL-ST, STP); • visual (LCD display with a resolution of 128x64 pixels). Search modes: • All metals; • sectored discrimination with 2 ° step. Control modes: • Dynamic programmable; • Static with adjustable threshold. Power Supply: - 6 batteries (type AA (LR6)); Continuous operation time: - 16-18 hours in normal mode, 6-7 hours in Turbo mode (Rechargeable batteries 2500 mAh) - up to 40 hours in economy mode Overall dimensions, mm: • Telescopic rod - 1200 (Max.); • Electronic unit - 120х70х115; • Search coils - Ø 260 mm, Ø 380 mm, 150x260 mm, 240x320 mm Weight of the device: - 1300 g (without battery) The device allows the ability to work in water depths of up to 15 meters, without submerging the control box.
Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. 6 ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected] GETTING STARTED Assemble the metal detector. To do this: install the appliance in a metal bar; tighten the Collet Chuck; install the inner (plastic rod) sensor; install the rod with the sensor in a metal bar to desired length, using the tabs and holes in the rod tightly and evenly wrap the sensor cable around the rod. Freely hanging cables can Cause falsing; connect the sensor connector to the electronic unit. WARNING! Do not over tighten the attachments and fittings for the telescopic shaft. This applies in particular to the plastic bolt for the search coil and shaft collets. Thanks to a specially designed three-knee construction shafts do not need to be disassembled for transportation, simply push the knee shafts into each other all the way and the device is ready to be carried compactly (fig. 1) POWER SUPPLY The device is powered using 6 AA batteries or 6 rechargeable NIMH. Rechargeable batteries and charger are not included and must be purchased separately. We recommend that you use NiMH batteries from SANYO, ANSMANN 2500 capacity-VARTA or 2850 Ma/h. The use of standard alkaline batteries is possible but not cost effective as the rechargeable batteries pay off after 4-5 recharges. fig 1 When using batteries, with a capacity of 2500 Ma/h, continuous operation is approximately 16 hours in the main mode and 6-7 hours in Turbo mode. Several recommendations on the use of nickel-metal hydride batteries: -Avoid fully discharging the batteries with each cycle use as this shortens their lifespan. Slight memory effect is eliminated by one complete discharge approximately once a month. -After extended periods, of storing the device, it is usually good practice to fully discharge and charge the batteries a total of 4-5 times. -Remember that due to the self-discharge nature of the batter capacity falls (by About 5% per day, so it is advisable to charge batteries before each use. -DO NOT use rechargeable batteries that have different capacities in the same set. WARNING! When connecting the battery magazine to the device connector insure the battery is properly connected (polarity is indicated on the battery cartridge) and insure the voltage source is correct. In the case of incorrect polarity or improper voltage the device can be damaged .
Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected] 7 CONTROLS AND CONNECTIONS Appearance of the device is shown in Figure 2. Sensor (coil) Electronic unit Grip Armrest Telescopic shaft Socket for headphones Battery compartment Fig. 2 On the rear panel of the device are the coil connector, on/off switch and the serial number of the device (fig. 3). Located on the front panel are the LCD graphic display (with a resolution of 128 x 64 dots) and 11 touchpad controls (fig. 4). Fig.3
Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. 8 ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected] Fig. 4 Sets the sensitivity of the ST (short tone) channel Sets the sensitivity of the threshold RT channel (Real Time) Sets the volume of the audio Select the Discrimination edit mode Switch between all metals/discrimination Navigate through the menu and change the settings, also turns the Turbo mode on/off. Move through the menu and change the settings, as well as turn on/off the S Algorithm Switches between User Programs Access the Ground Balance modes Confirms the selected settings. Selects a menu item. In search mode switches between Static and dynamic (Pinpoint) modes. In ground balance mode switches between Auto and Manual GB. Button to enter the Main Menu
ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected] 9 Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. DISPLAY SCREEN In search mode the display device displays the Hodograph information of detected objects and information about the current operation modes (Fig. 5). VDI Number Signal level Battery charge level T-Turbo mode is enabled (see page 14) Number of the current user program 1-4 (see page 14) A-enabled auto adjustment ground balance (see page 17) С – Static Mode enabled (pinpoint) (see page 13) S – S-Algorithm enabled (see page. 14) М – Metal Trash mode is enabled (see page 16) Fig. 5 VDI-number “Visual Discrimination Indication”. This is the index of electrical conductivity of the object or the angle between the vertical axis and the predominant direction of the hodograph (time curve). In this case, hodographs which are on the left side of the screen have a negative VDI, and the right - have a positive VDI number. The amplitude of the signal, from detected objects, is displayed in standard numerical units ST SENSITIVITY, RT SENSITIVITY / VOLUME This section introduces the three main parameters that youll use most often. For each of these settings there is an individual button on the control panel. SENSITIVITY ST [1 .. 14]. Increasing this setting allows you to increase the depth of targets youre searching for, but it reduces the accuracy of identification and increases the risk of false positives. The recommended value is 9-10. Warning! Setting of the ST sensitivity above 11, and especially 14 can lead to a significant increase in the amount of false positives from the soil in high salinity or when bumping the search coil. SENSITIVITY RT [0 .. 9]. Adjusts the sensitivity of the threshold or RT channel you hear constantly during the search. The value of this parameter is set as a compromise between sensitivity and comfort. Increasing this value increases sensitivity in the threshold channel. However this can reduce the comfort in searching. Recommended settings are 6-7. VOLUME [1 .. 9]. T h i s s e t t i n g ad j u s t s the overall volume of the audio response from detected objects. Select the value based upon individual comfort preference. The current values of these parameters are displayed on the screen above the relative buttons (Fig. 6).
10 ООО «фирма «АКА», +7(495)621-0481, http://aka.2000.ru [email protected] Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации. To change any of these settings press the appropriate button. The value of the selected option is highlighted on the screen with a rectangle around the appropriate value. Press the button Fig. 6 Or to set the required value. In order to exit the parameters simply click the button again. When neither the RT, ST or Volume values are displayed on screen - the buttons and will now act as on / off modes for the Turbo and S-algorithm, (see below) GROUND BALANCE Balancing the device to the ground is the single most important part of the device settings for accurate search results. Improper ground balancing can result in decreased responses to targets and may result in instability as well as an increase in false ground signals. To explain the basic physics behind the ground balance procedure. Every object has its own shape, conductivity and magnetic component, which together are called the VDI (Visual Digital Index). Remember that the VDI is the angular response that is numerically equal to the angle of deflection of the signal vector time curve (hodograph display) on the vertical axis. The soil, or ground, depending on the degree of mineralization (presence of iron oxides) imposes its signal on the target signal thus changing the VDI upscale. This is especially true on small or deep targets, as well as large highly conductive targets (copper, silver, aluminum). This can actually push these high VDI targets up and over into the high negative VDI range known as “VDI wrap around”. To minimize this effect, it is crucial to perform a proper and accurate ground balance procedure. The basic objectives of balancing: 1. Make the soil invisible to the instrument, i.e. exclude false signals from the ground where there is no target. 2. Install the correct (standardized) reference system number for the VDI. When receiving a signal from both the ground and a detected object the detector must subtract mathematically the signal from the ground in order to display a correct VDI indication of the detected target Keep in mind that when performing “air tests” inside after the detector has been previously balanced in soil may result in incorrect VDI readings. This is due to the correction factor for the VDI previously set in the last ground balance. This may result in the loss or “invisibility” of large aluminum, silver and copper targets. If the ground setting is too positive the VDI will be offset positive and vice versa if the ground balance is negative.