404 Intrinsically Safe Vibrating Wire Readout Box
Contents
1. Use with Geokon y i Frequency POS Model No MODE Calculation Units Sweep Hz A All Dg F x10 Digits 450 6000 Hz F Hertz pS T usec B 4300BX 4350BX 4400 Dg Fx10 Digits 1500 3500 4500 4600 4700 4800 Hz F Hertz 4900 uS T uSec C 4000 uE F x10 x 4 062 uStrain ue 450 1200 Hz F Hertz uS T usec D 4200 uE F x10 x 3 304 uStrain ue 450 1200 Hz F Hertz uS T usec E 4100 uE F x10 x 0 39102 uStrain ue 1500 6000 Hz F Hertz uS T usec F 4300EX 4350BX Dg Fx10 Digits 2500 6000 Hz F Hertz uS T usec Where F Frequency in hertz T Period 1 F in microseconds 5 3 CFG CONFIGURATION BUTTON In operating mode pressing the CFG button will put the readout into configuration mode This allows the changing of a number of operating parameters of the readout by way of the configuration menu When CFG button is pressed the following is displayed on the LCD Model 404 v1 1 Config Menu After a short delay the first menu entry is shown as below BACKLIGHT Press lt MODE gt for ON OFF Page 8 of 14 Pressing POS will step through each of the configuration menu entries pressing MODE will toggle through the options available for that menu entry The four entries and their options are BACKLIGHT Press MODE momentarily to toggle the LCD display backlight ON or OFF default BATTERY This is for display only A bar graph will show the current voltage level of the inbuil2. Page 2 of 14 1 Introduction The Model 404 Vibrating Wire VW Readout is designed to monitor and read vibrating wire type sensors such as piezometers uniaxial and biaxial stressmeters Based on the Geokon GK 404 VW readout the Model 404 has been approved as intrinsically safe for use in underground coal mines to IECEx ia It is housed in a rugged splash proof stainless steel case and comes with a protective cover Designed as a hand held unit the tactile membrane keypad allows single handed use while the large backlit display allows easy reading in underground situations The battery source is inbuilt and rechargeable and the unit comes complete with a wall charger for use outside of hazardous areas Operation is the same as for the Geokon GK 404 and allows reading of vibrating wire sensors over a range of frequency sweeps and units including digits Hz x10 period us and frequency Hz The Model 404 is designed for use with specifically designated sensors available from Geokon Inc The Intrinsic Safety certification is for the readout in combination with those sensors It cannot be used in hazardous environments with any other sensors regardless of their characteristics If the readout wiring and sensor are all located in a safe environment the Model 404 can be used to monitor any vibrating wire sensor that will respond to one of the six excitation states listed on page 8 Page 3 of 14 2 Intrinsically Safe Par
3. configuration menu An auto power off function is also provided Page 5 of 14 4 Front Panel and Connections The Model 404 readout is controlled using four membrane push buttons on the front These buttons are provided with tactile feedback and have different functions depending upon the operating mode The buttons are 1 ON OFF turns the unit on and off 2 POS changes the reading position in operating mode or the menu option in configuration mode 3 MODE changes the units in operating mode or the menu option setting in configuration mode 4 CFG enters or leaves the configuration mode Above the buttons is 5 the display a 16 column by 2 line back lit LCD with adjustable contrast On top of the unit is 6 the sensor socket where a lead is connected to allow the field mounted transducers to be connected to the readout for readings to be taken On the right side of the unit is 7 the charging connector socket where the supplied wall charger can be connected to allow charging of the readout A battery meter is available within the configuration menu and a low battery warning will appear if the battery voltage drops too far Figure 1 GEL Instrumentation Model 404 Vibrating Wire Readout main features Page 6 of 14 5 User Operation Before use the Model 404 VW readout should be charged fully Normally a full charge will give seven hours continuous operation or longer if the unit it switched off while not
4. actively reading sensors The Model 404 is supplied with a lead for connecting the readout to sensors The lead consists of a plug that mates with the socket on the top of the unit with the other end terminate in alligator plugs connected to each of the individual coloured wires Note The lead pictured is the standard If different connectors are required for the sensor connection instead of the alligator clips please contact the manufacturer and custom cables can be provided The wires and the boots on the alligator clips are colour coded to match those of the sensor wires that is red for the positive vibrating wire gauge lead black for the negative vibrating wire gauge lead green for the positive thermistor lead white for the negative thermistor lead and blue for the transducer drain wire NOTE These colours are typical for Geokon sensors containing a single coil Where there are multiple coils within a sensor such as 4350BX Biaxial Stressmeters or sensors from a different manufacturer are used please consult the user manual for that sensor The plug of the lead should be connected to the socket on top of the Model 404 the alligator clips to the corresponding wires of the sensor and the unit turned on by pressing the ON OFF button The initial screen on the LCD will display the following GEL Inst Model 404 v1 1 After a delay of around a second the readout will start taking readings and show a screen that looks similar t
5. overnight for 14 hours If partially discharged a shorter charge time is sufficient Only the supplied charger should be used note that there is no indicator on the charger to show that it is charging the batteries or that the charge is complete The dust cover on the charge socket should be inserted after charging is complete to prevent dust or dirt filling the socket and preventing the plug fitting If dust does build up in the socket a soft brush can be used to clear the dirt away otherwise return the readout to the manufacturer for cleaning The case can be cleaned using a damp cloth Avoid the use of solvents as these may damage the material of the keypad and or soften the adhesive attaching it to the case Page 11 of 14 8 Calibration The readout should be returned to the manufacturer every twelve months for checking cleaning and calibration A calibration sticker on the readout will indicate when it is due to be returned 9 Troubleshooting Below are a few common problems with the Model 404 readout along with suggested solutions There are no user serviceable parts inside the readout so if the problem is not listed below or the solutions do not work please contact the manufacturer for advice Readout will not turn on There may be a problem with the internal batteries Charge the unit overnight and if it still will not turn on contact the manufacturer If it will power on check the battery meter to see if it is fully charge
6. GEL Instrumentation ty Ltd E User Instructions Model 404 Intrinsically Safe Vibrating Wire Readout S 404 03 rev O 17 10 13 Contents 10 11 12 5 1 5 2 5 3 VIMEO AUCTION acoso ER 3 Intrinsically Safe Parameters onini nien tbi eee haee te Pha dese bk use ee hase ee aa E ge eoa dae de hae 4 Principle of Operation niece tacere ete ceno sita e eoe aeii aeuo dt edu pac eau dada e Rad dod ence 5 Front Panel and Connectiohs iiec dee rid te re ERR tant n Se LER nha pde e ate 6 User Operation mE DL TTE 7 POS POSITION BUTTON erret eene nea REN pe Eae onere Ege aede el oe rinse 7 MODE BUTTON crome eee bI nt E EE a E eer n eee 8 CFG CONFIGURATION BUTTON ssssssssesseeeeeeee nennen nennen entente iris nte se trs nnns 8 Low Battery Indication and Auto Off seessssssssssseseseeeeeeee nennen enne nennen 10 VEI IIEDId RETI a E 11 e bICDISe H M 12 Troubleshooting 5 22 5 3 n indeed eii tec cer needed eco ao os de ee add aee Foe ada Re HORS RE YEA RA d x FON aU ce 12 Specifications 2 scscecesessucevsesscecdessacctvassccdevansceleveasscdcdvanscddesssacecessagedesossectesadagecdsonscgedesessedeessecaecass 13 ACCeSSOFIGS rcd orte p Hie m idee ae es didcems edere Prison saec Dd deae 14 Connector Pin Outs re niece aded DE EC uo ee ene Cedo ta ee 14
7. ameters Approval for use in underground coal mines has been given by Simtars by way of certification IECEx SIM 13 0014X The equipment and associated sensors have been assessed as compliant to the following standards IEC 60079 0 2011 IEC 60079 11 2011 The Model 404 readout can be used in temperatures ranging from 20 C to 40 C The certification for the Model 404 readout states the following information also recorded on the front of the unit Manufacturer GEL Instrumentation Pty Ltd Equipment Vibrating Wire Readout Type Model 404 Grouping and Classification Ex ia 1 IP54 Serial Number unique identifier stamped at the bottom of the faceplate Certificate Number IECEx SIM 13 0014X Additional Marking Un 9 2 V Sensors that are certified for use with the Model 404 in hazardous environments will be marked as either Type 1 Type 2 Type 3 or Type 4 They are labelled with the following information as a minimum Sensor Type Type 1 2 3 4 as appropriate Serial Number unique identifier for that sensor Certificate Number IECEx SIM 13 0014X The maximum permissible cable length between the Model 404 readout and an approved sensor is 1000 metres There are no user serviceable parts within the Model 404 readout or associated sensors Should the equipment be faulty or damage occurs to the outer case contact the manufacturer to organise repair or replacement On no account should the user attempt to open the case or repa
8. d If the battery life after charging is less than four hours the unit will need to be returned to the manufacturer for battery replacement Vibrating wire reading shows dashes Check the connections to the sensor If they are ok try using the Model 404 readout on another sensor preferably one known to be working If still unsuccessful contact the manufacturer to arrange return and repair of the readout Vibrating wire reading is unstable Check the correct position has been selected for the sensor Normally this will be the B position for piezometers and stress meters press the POS button if necessary to select the correct position If the position is correct the sensor is either marginal or there may be a strong source of electromagnetic interference nearby Thermistor temperature reading shows dashes As for the reading above check the connection to the sensor wires If they are ok try using the Model 404 readout on another sensor preferably one known to be working If still unsuccessful contact the manufacturer to organise return and repair of the readout Make sure the sensor has been supplied with a thermistor option fitted Page 12 of 14 10 Specifications Vibrating Wire Readout Excitation Range Measurement Resolution Measurement Accuracy Temperature Readout Sensor Type Sensor Accuracy Measurement Range Measurement Resolution Measurement Accuracy Physical Display Dimensions Weight Temperat
9. ir the readout or sensors The supplied lead can be modified by fitting a different sensor connector in place of the alligator clips by the user or the readout can be supplied with a custom lead and the sensors a custom plug if required Only the supplied charger should be used to charge the readout Page 4 of 14 3 Principle of Operation The Model 404 is designed to excite and read a vibrating wire instrument typically installed to monitor pressure or stress An on board microprocessor generates a variable frequency square wave of 5V amplitude varying the frequency in a sweep from a lower to an upper bound according to the position selected This wave is sent through the red and black wires of the sensor cable to excite the coils of the sensor connected and vibrate or pluck the wire in the sensor The circuit then listens to the frequency the wire is vibrating at converts this to the units required and displays it on the LCD display At the same time the circuit measures the resistance of the thermistor within the sensor converts this to a temperature and displays it on the second line of the LCD display By choosing a position for the readout the user can select the frequency sweep the readout will use Within each position there are a number of units selectable to choose how the reading will be displayed The LCD is back lit and has variable contrast both of which can be controlled by the user via the
10. o the following Pos Reading degC B Dg In this example the readout has been setup in the default configuration of reading position B and there is no sensor connected hence the dashes in the second line With a sensor connected the display will look something like the following Pos Reading degC B 8906 2Dg 17 3 The position frequency sweep and units can be selected by the user by way of the POS and MODE buttons 5 1 POS POSITION BUTTON In operating mode pressing the POS button will change the frequency sweep of the pluck between one of six preconfigured ranges Each press of the POS button will step to the next position from A Page 7 of 14 to F The range is changed to suit the sensor being read with the most commonly position being position B for Geokon 4500 piezometers and 4300BX stressmeters 5 2 MODE BUTTON In operating mode pressing the MODE will step between the three unit types available for each position The format for the vibrating wire reading steps between Dg digits or Hz x 10 Hz hertz HS period or E microeulers or microstrain for each press of the MODE button depending upon the position selected The table below lists each position from A to F the units available and the frequency sweep used The sensors listed are the typical Geokon models suited to each position but other makes and models can be used according to the required scaling and processing requirements
11. t rechargeable battery supply If it is filled all the way to the right or F this represents 7 2V the nominal voltage of the battery pack If no bars are showing or E this represents 5 0V which is the automatic cut out level of the readout where it will automatically shut down CONTRAST Press MODE to adjust the contrast of the LCD in 10 increments default 50 AUTO OFF The readout is configured with an auto power off setting Press MODE to toggle through the options 5 minutes default 15 minutes 30 minutes or Disabled After the specified time has elapsed without any of the front panel buttons being pressed the unit will automatically save any configuration changes and turn off If the Disabled option is selected the readout will continue to run until the battery reaches 5 0V or the ON OFF button is pressed The readout can be taken out of configuration mode and returned to operating mode at any time by pressing CFG twice The factory default settings can be restored by holding CFG and POS while turning the Model 404 on The default settings are POS B MODE Dg BACKLIGHT ON CONTRAST 5096 AUTO OFF 5 minutes Page 9 of 14 6 Low Battery Indication and Auto Off The power for the Model 404 readout comes from a battery pack consisting of six 200mA NiMH battery cells encapsulated in a silicone elastomer The nominal voltage is 7 2V but this can be higher at the end of a charge cycle The circuit will no longer work once the ba
12. ttery voltage drops below 5 0V To prevent exhaustion of the batteries the readout is programmed to warn of low batteries and automatically shut down if required Should the battery voltage fall below 5 4V a message will appear on the LCD saying Battery Low The readout should be placed on charge at this time Should the voltage fall below 5 0V the message RECHARGE BATTERIES will appear and the Model 404 will shut itself down All configuration settings will be saved prior to shut down Page 10 of 14 7 Maintenance There are no user serviceable parts inside the Model 404 Readout Opening the case or damage to the membrane facia may interfere with the intrinsic safety performance of the unit and any readout that has been altered or damaged must not be used in a hazardous environment The internal Nickel Metal Hydride NiMH batteries will last for up to 1000 charge cycles after which the operating time between charges will start to reduce The batteries can be replaced only by sending the readout back to the manufacturer They are encapsulated in a potting compound and any damage or removal of that compound will void the intrinsic safety certification Battery life can be maximised by regular charging of the readout Even when fully charged the batteries will be flattened after a few weeks so it is important to keep the unit on charge when not in use If the Batteries Low indication is seen it is recommended that the readout be charged
13. ure Range Battery Operating Time 400 Hz to 6000 Hz 5 volt square wave 0 1 Hz 0 1 us 0 1 digit 0 025 of full scale 6000 Hz Thermistor YSI 44005 Dale 1C3001 B3 Alpha 13A3001 B3 0 5 C 15 C to 60 C 0 1 C 1 0 of full scale 16 columns x 2 lines LCD backlit variable contrast 165mm H x 110mm W x 45mm D Approx 1100g 0 C to 40 C 20 C to 50 C Hazardous Non hazardous Internal and encapsulated NiMH pack nominal 7 2V DC minimum 7 hours continuous at 25 C Page 13 of 14 11 Accessories The Model 404 Vibrating Wire Readout is supplied with the following accessories e Vibrating wire sensor interconnect cable flying leads other connector available by request e Model 404 Vibrating Wire Readout User Instructions e Wall charger e Carry case with belt clip 12 Connector Pin Outs Transducer plug Lemo 5 pin HGG 2B 305 CLLP Pin Wire Colour Alligator Clip Description Boot Colour 1 Red Red VW Coil 2 Black Black VW Coil 3 Green Green Thermistor 4 White White Thermistor 5 Bare Blue Drain Wire Page 14 of 14
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