MAN-082 Hydraulic Piezometer Terminal
Contents
1. ccceceeseesseeeeeeeenseeeeeeeenseeesecennneeeseoaes 21 User dpnterraee OVervieWisasetelenteveciut qoM eee dta d s D WEE ES E AN ECL RE Ro eee 21 RES MOOC ra NU UU UT 21 FUNCION NOT RETRO Tm 22 FACTORY COT eibitidio MEE OU TOO 23 LOG F WI CRON orea utr sate ctetu a LLL culo ater i LEAD de IEEE 23 Contguradol FUNCTIONS we ar erat De ER ea eae 25 SyS ten FUR SHOES 25 ere 25 Charging the Battery uode BR M EIE M MIN M EM BEES 27 General InForrrietiODlssds os eot Rer E A Ebo pesi haa de atap eret d pM exta a REENA 27 Charging duele SCC E E EEN a DE eins aa 27 Care and Maintenance of the Logger 1 ee eeeeeeec ELLER nenne nan n annu 29 Pressure Logger Model 1019 Front Panel Layout e 30 2 Appendix B Summary of Basic Keypad Operation User Manual Section 1 Foreword This hydraulic piezometer monitoring system provides a simple and precise set of instruments designed to operate consistently under normal field conditions Although the components of the system are relatively robust they will not survive mishandling or neglect Treat all items with respect and handle with care Operators should first read and understand the contents of this manual before following closely the various operations described Failure to do this may result in degraded performance and reduced reliability Nor2. NN s T i PA HP M U 5mH Om h V EN Ew m Where D 2 h u v p 2 10 5 v p 30 v 0 30 mH gt 0 for v 5 mH50 p 35 mH20 for v 10 mH20 for p 40 mH20 11 Example 2 f D _PIRCOMEIINIG LEVEL n Y mij l User Manual AX E A U 4mH 4 p RENT EN i 2 7 4 v p 6 E for v _ p Peer for v _ ery p PES for Prete 12 Section 7 De Airing Piezometers To de air each piezometer in turn calculate the de airing pressures and the volume of water required to fill the two nylon tubes to the piezometer Circulate de aired water at the calculated pressure through the piezometer tubing measuring the amount on the graduated scale of the pressure tank of the de airing unit Circulate water until no more air bubbles are seen to be returning through the nylon tube checking that the volume of water returning corresponds to the volume leaving the de airing unit Tubing 2W2 1 used for de airing lines has a volume 66 cc per 100m Each piezometer has FLOW and RETURN lines User Manual 13 Section 8 The Portable Readout Unit 8 01 General details The readout can be either a simple read only unit to a data logger system Both units have a transducer box attached to them in the form of a small enclosure which houses them electric pressure transducer and hydraulic circuitry Before use the transduc
3. to the return tank C The volume changes measured in both the return and pressure tanks indicate the quantity of water circulated through the system The object is to completely replace the water in the piezometer tubes with freshly de aired water The equipment has been fully tested to the operating pressure and under vacuum before despatch However it is possible that movements of the panel during transit may disturb the cylinders pipework or valves sufficiently to cause leaks when the equipment is operated If any leaks are observed during operation they should be eliminated by gently tightening the appropriate component Never modify the arrangement without the full written approval of Soil Instruments as unauthorised modifications may bypass the safety system INFORMTION It is advisable to drain water from the equipment during cold weather to prevent damage to the cylinders due to freezing Place the vacuum pump to the right of the unit the pressure pump to the left hand side The pressure pump connects to the Schrader fittings on Valve K 4 02 Preparation and Setting Up It is essential to operate the valves in the order stated Initially all the valves should be closed Completely evacuate the bladder and partly fill the pressure tank A with clean water Attach the vacuum pump with the hose supplied to Valve E Open Valves G and E and apply vacuum until the bladder is completely evacuated Close all valves Immerse one end of th
4. INFORMATION however that long term use of the battery pack without allowing it to completely discharge will cause a loss of capacity this is due to the inherent memory of nickel cadmium cells You can limit this effect by periodically allowing the battery pack to discharge to the point where the instrument will no longer operate You should do this at least once every 30 to 40 charge discharge cycles 15 02 Charging Procedure Plug the flying lead of the battery charger into the socket provided on the Logger front panel Connect the battery charger to a suitable AC mains supply indicated on the battery charger and switch on To check state of charge Switch Logger on Press FN key followed by 7 key The battery voltage under load conditions will be displayed on the LCD Make a note of the voltage and compare it with the figures given below User Manual 27 A good battery under the Readout Unit load conditions should have approximately the following voltage characteristics at normal laboratory temperatures 13 6 13 9 volts fully charged 10 0 volts exhausted cell damage may occur if voltage falls below the figure INFORMATION the available usable battery power will be extended if the backlight facility on the Logger is limited User Manual 28 Section 16 Care and Maintenance of the Logger The Pressure Logger is a precise measuring instrument designed to operate consistently under normal field conditions if reasonab
5. Table dump Pressing FN aborts at this point The RS 232 Port has a hardware handshake which if inactive for more than 2 seconds results in COMMUNICATION FAULT being displayed and the Dump aborted If the FN key is pressed during either a Log or Table Dump then LOG TABLE DUMP ABORTED is displayed e Function 3 Clear Log Entries If no measurements have been saved the LOG EMPTY is shown on the display If the Log contains more than one date then the user is prompted for either a ALL or PARTIAL erase Pressing either keys 1 or 2 selects the option any other key aborts the function If PARTIAL erase is selected the user is prompted to select the dates bounding the partial erase The display shows CLEAR LOG FROM 05 08 96 The default date shown is the earliest date in the Log The T and 4 keys move through the Log by date The SAVE key then selects the erase FROM date and the display now shows CLEAR LOG FROM 11 06 96 TO 28 07 96 24 The default TO date is the latest date in the Log Again the T and 4 keys move through the Log by date and the SAVE key selects the erase TO date The user is prompted to confirm the erase by pressing key 1 any other key aborts the function 14 06 Configuration Functions Function 4 Modify Table The user is prompted to enter the following parameters The 0 9 keys are for direct data entry The 7 and 4 keys are used to increment decrement the curre
6. follows u pore pressure in the fill at the tip p pressure on the pressure side of the de airing apparatus V pressure on the vacuum side of the de airing apparatus h difference in head between the tip and the pressure and vacuum gauges on the de airing apparatus fAB and fBC friction losses in the piezometer tubes All pressures are measured with respect to atmospheric pressure For Equilibrium h u faB y h u fBD Since AB BC and if no water flows in or out of the tip the velocity will be the same throughout the system then fAB fBC p 2 h u v In a piezometer installation h is known v can be maintained at a known value and u for each tip can be estimated using previous pore pressure readings In this way p can be calculated for each piezometer and de airing carried out at the appropriate pressure If the piezometer lies below the readout point the term h the difference in head between the tip and pressure and vacuum gauges on the de airing apparatus changes sign and becomes negative When a piezometer has accumulated a lot of air care should be taken to apply sufficient pressure to drive water at least as far as the tip before applying a vacuum to the other lead as friction loss in the return tube carrying air is much less than in one carrying water and air will be drawn in through the tip from the fill Example 1 User Manual 10 User Manual
7. N OFF key Press FN and the 4 the default CHN 100 will be displayed Press SAVE to display UNITS Press 7 or 4 to display units required and then press SAVE to select To switch logger off press ON OFF key b For LOGGING Operation The operation sequence is almost identical to the READ ONLY mode but requires dedicated channels to be set up for storing reading from different installed instruments and to provide identification for data retrieval purposes Switch Logger on by pressing ON OFF key Press FN and then 4 the default CHN 100 will be displayed Select a dedicated channel by keying in the required number with 0 9 directly or by using T or 4 and pressing SAVE when required number is displayed Select the required engineering units required by pressing T or 4 keys to display those required and use SAVE to store them Repeat these steps for the full number of dedicated channels required for transducers To Log a reading first connect the Logger and select the corresponding channel number When the reading has stabilised press SAVE and the message SAVED will briefly be displayed in bottom left corner of the display To continue logging select the channel required next by keying in the number directly with 0 9 or using the T and 4 keys and then continue as above To switch Logger off press ON OFF key soil INSTRUMENTS Bell Lane Uckfield East Sussex t 44 0 1825 765044 e info itmsoil com TN22 1QL
8. Options Changes the sign during number entry 4 Decrements selected value or Scrolls DOWN Log and Menu Options FN Function toggle to enter leave Function Mode Possible functions are 0 Factory configuration 1 Read Log 2 Dump either Log or Table to RS 232 Serial Port 3 Clear Log 4 Modify Table 5 Set Clock Calendar 6 Set RS 232 C Serial Port Parameters baud rate etc 7 Battery Status and Log Status 8 Auto Zero SAVE In Read Mode saves channel reading in Log In Function Mode enters value INFORMATION Keys A B C amp D are not connected on this Logger model 14 02 Read Mode Entered from power up User Manual 21 Continuously displays pressure on the transducer The display shows CHN 101 1154 mH 0 28 08 96 13 02 17 if mH50 units are selected CHN 101 115 kg cm 28 08 96 Dene la 13 02 17 if kg cm units are selected CHN 101 1639 psi 28 08 96 if psi units are selected 13 02 17 The keys have the following usage SAVE Saves current reading in the Log with a date time stamp SAVED appears briefly on line 2 of the display to acknowledge this T Increments channel number 4 Decrements channel number 0 9 Allows user to enter a new channel number in the range 000 999 Data entry is from right to left If channel 000 is entered then this selects READ ONLY MODE indicated by CHN nnn being absent on the display Onl
9. United Kingdom f 44 0 1825 744398 w www itmsoil com Soil Instruments Ltd Registered in England Number 07960087 Registered Office 5th Floor 24 Old Bond Street London W1S 4AW User Manual 31
10. Valve P on the de airing unit and disconnect nylon flyleads from the top and bottom manifolds of the terminal cabinet To establish zero reading on the transducer box and readout display operate Valve X to READ position Check that the water level at the sight window is on DATUM LEVEL If not adjust level by removing or adding small amount of de aired water with s syringe through the air bleed cap When satisfied that water level is correct check readout display and adjust SET ZERO screw with screwdriver until zero is shown on the readout The unit is now ready for taking readings User Manual 14 Section 9 Care and Maintenance 9 01 Terminal Cabinet De Airing Equipment and Readout Since the Hydraulic piezometer system employs water as the pressure sensing medium it is essential that the equipment is adequately protected against freezing in severe cold weather conditions The terminal cabinet must have the small paraffin heater filled and operating Ensure that the flame of the heater is not too high to cause smoking Ventilation is incorporated into the cabinet via two louvre panels which provide sufficient oxygen to support the heater A full heater should operate satisfactorily for approximately 3 days It is therefore essential during freezing conditions to check the paraffin level at suitable periods If the de airing unit or de aired water boiler are to be stored in areas where freezing is likely both units must be emp
11. d 2 line 24 character alphanumeric liquid crystal display and sockets for flyleads Dimensions 320 x 190 x 135mm Weight 4 3 Kg 5 5 Kg if transducer box fitted 13 02 Set of Two Flyleads a Flylead to connect Logger with Transducer Box Not supplied if transducer box fitted b 2m long Serial Port Flylead Logger 25D connector to connect Logger to IBM computer Weight of flylead set 390 g 13 03 Battery Charger The battery charger supplied is designed to charge the nickel cadmium cells which power the Logger Other types of charger must not be used The charger is housed in a plastic case complete with flylead to connect to the front panel of the Logger Plastic cased units are dedicated for 115V AC or 230V AC supplied User Manual 20 Section 14 Operating Procedures for Pressure Logger 14 01 User Interface Overview The Pressure Logger user interface consists of a two line 24 character alphanumeric Liquid Crystal Display LCD and dust and waterproof 20 key tactile response embossed Polycarbonate membrane touch panel with the following assignments Tt 000000007000000T 7777700000000 Co0707000000000000Tqp 7777700000007000d Co077070000000007077777Ul Re e B Rui Gu e Ri i i B Ru i i i n s n i n n n s d i E n a eris bm wa cu mum E n WR E m m E E uw e uiri eee 0 1 ON OFF power toggle The instrument will auto power off if no key is pressed for 10 minutes T Increments selected value or Scrolls UP Log and Menu
12. e logger reader utilising the very latest 16 BIT microprocessor technology and support circuitry The CMOS design incorporates sleep modes to reduce power consumption and a large memory address space to minimise constraints on both program and data storage Features include a b c d e f g User Manual Continuous display of measured pressure and display and storage of measured pressure Display of readings using pressure units in BAR kg cm KN m mH50 ft H20 mHg psi mPa kPa and user defined Configuration information can be entered to control the storage of measured pressures When the transducer box is fitted range is specified by the user at the time of purchase Facilities for storing up to 12000 pressure measurements in the form of a Log Log entries are battery backed Each pressure measurement in the Log has the following stored information i Channel number ii The stored pressure value in engineering units iii The date and time stamp Readings are stored in the Log with the most recent one at the top If more than 12000 measurements are saved then the earliest saved measurement s are lost Facilities for dumping the contents of the Log via an RS 232 C serial port 19 Section 13 The Equipment 13 01 Pressure Logger Housed in an epoxy painted lightweight steel case with hinged sealed lid and carrying handle The Logger incorporates a sealed membrane panel with tactile keyboar
13. e red rubber tube into a container of clean water and attach the other end to Valve J at the base of the pressure tank A Open Valves J and E and operate the vacuum pump drawing the water into A When this tank is seven eighths full close Valves J and E Remove the hose from E open Valve E to release the vacuum and then close INFORMTION Do not allow water to be drawn back to the vacuum pump Prepare some de aired water in the de airing boiler allowing it to cool as described earlier Connect Valve S on the boiler to Valve M on the tank C using a length of black rubber hose Attach the vacuum pump to Valve I open valves I and M and release the vacuum from the boiler by opening slowly Valve V on the boiler Open Valve S and by operating the vacuum pump draw the de aired water into tank C until it is three quarters full Close Valves M and I Remove the black vacuum hose and open Valve I to release the vacuum Open Valves G and L attach the vacuum hose to G and draw the de aired water from tank C into tank B by operating the vacuum pump until tank C is only one eighth full Close all valves To fill B completely it is User Manual necessary to repeat the operation but only half filling C with de aired water When tank B is almost full close all valves Remove the vacuum hose from G Open Valve K and operate the pressure pump to bring the pressure in tank A to 5 10mH50 Open Valve N and gently open Valve G thereby inflating the bladder disp
14. ecssosseceecsessecsecteassersestoassetsessegseesectsagsenteetes 6 Preparing De Alred Water usos veciz enc Eua tg xa ud e tacens koc ed vata Nuts cupa nine 6 The Portable De Airing Unit oco eet en PU a eee P Rn heic BO tnr 7 Genera Detal S usate sete Dirt de ERES os ta c Lu Le E ME c Lans 7 Pr paration and Setting UD sccn tenes custom e eto tub vx e 7 Operation ana Recharglilg i ooi I one Ud MEE OMA UN CIE E E MD ME UD UM NI EE 9 Calculation of De Airing Pressures 1 eeeeiieeeeeceliiee enema nhau nna a aaa a nna anna ann 10 De Airing PlezometeElsS oueseniiesaacpaviukE aa EY Vu EE aS REMR UEM RES av CERE ELLLER REELLE REELLE ERE ELLER ELLER RENEE 13 Ine Portable Readout UG oii uxores nies d Oswald a 14 ceneral c ES DU UT T UTEM 14 Care and Maintenali6e iret Eventos Da cores ev a REO UTR ND ROTE EUPA TEUER UA 15 Terminal Cabinet De Airing Equipment and Readout eeesseeeeeeenee 15 MEMOry Er Q 16 Operating PFIHCIDIG 5 hend RI M NEIN I MEM ME 17 Portable Readout with Integral Transducer sssssssenueeeeesnen enken kk ker kk ktr nennen 17 Pressure Logger Model 10 19 MM Gus sus E REEL REESE REELLE LER E NEN 19 IW ah Oyo Keel 9 g fi LEER 19 The EGHIDIDGI oiii en ES EEN cee 20 Hs ii ig mRepsg tcr 20 SELO TWO FIylead S T 20 Battery Cnardgel omea ena a a a a 20 Operating Procedures for Pressure Logger
15. er box has to be primed with de aired water Priming needs only to be carried out once with possible occasional topping up or flushing re priming To carry out initial priming first switch the readout on and observe the digital display is stable Several minutes may be required for the display and electronics to stabilise Connect the flying nylon lead from the transducer box to the quick connect on the SEND manifold at the terminal cabinet With the portable de airing unit prepared as discussed at section 6 Connect the nylon flylead from Valve P to the lower RETURN manifold quick connect Check all valves on the de airing unit and terminal cabinet are set in the off position Open Valve 1 and 2 on the SEND and RETURN manifolds and set the small valve on the readout transducer box to BLEED amp CAL position Using foot pressure pump connected to Valve K on the de airing unit and with Valve K open slowly pressurise cylinder A to approximately 2 to 3 metres head of water on the pressure gauge Open Valves N and P on the de airing unit De aired water will flow through the lower manifold into the top manifold via the loop between Valve 1 and 2 and on through the nylon flylead connected at the quick connect to the transducer box where it will be observed that the level of water in the sight window will be rising When the water level is coincident with the DATUM LINE operate Valve X on the transducer box to READ position Close
16. filler cap Selecting this option results in the following display PRESS 1 TO AUTO ZERO ANY OTHER KEY TO ABORT The user is prompted to confirm his intention to reset the zero by pressing key 1 Any other key aborts the function User Manual 26 Section 15 Charging the Battery 15 01 General Information The Pressure Logger is powered by a rechargeable Nickel Cadmium battery pack housed within the instrument carrying case The battery is normally charged overnight immediately after using the instrument Charging should always be carried out before storing the Logger for any length of time Battery shelf life period after which capacity has fallen to 60 of its original fully charged level is temperature dependent Temperature Shelf Life 0 degrees C 120 days 20 degrees C 40 days 40 degrees C 20 days Also note that battery storage life period after which only 60 of the stated capacity is obtained is greater than 5 years The battery charger is capable of charging the nickel cadmium battery at a constant current of 400 mA Charging of a completely exhausted battery battery voltage 10 0V will take about 14 hours Charging for longer periods will not damage the battery but prolonged or permanent charging is not recommended During charging you should ensure that the ambient temperature is in the range 10 to 45 degrees Centigrade The battery has a typical life of 700 full charge discharge cycles
17. hat the logger is recharged once a month even when not in use User Manual 16 Section 11 Operating Principle 11 01 Portable Readout with Integral Transducer Prior To Site Visit a Pressure Indicator Zeroed at Datum Level b Pressure H4 is applied to check the indicator calibration prior to site visit On Site User Manual HFADFR TANK SUPPORT FRAME HEADER TANK LEVEL A i S ES Ng u FLYLEAD V DIGITAL H U N D C F TH DTM Y ze A A A aN 17 TFRMINAL CARINFT rH NM FLYLEAD DIGITAL PRESSURE IN INDICATOR DM PIEZOMETRIC LEVEL Y X F PORE PRESSURE TIP ELEVATION Y PIEZOMETER TIP C Pore Pressure at the Tip is equal to Datum Elevation plus Indicator Reading H minus Tip Elevation or Pore Pressure at the Tip is equal to Hp Indicator reading Hj d If the Piezometer is installed above the transducer datum then the value of Hp will be negative Example 1 Example 2 when Piezometer is below transducer when Piezometer is above transducer datum datum If Hp 11m If Hp 3 0m and reading on the indicator is and reading on the indicator is 2 0m then P W P 11 2 0 2 0m then P W P 3 0m 2 0 9mH gt 0 5 0mH gt 0 User Manual 18 Section 12 Pressure Logger Model 1019 12 01 Introduction The Pressure Logger in an intelligent battery powered portabl
18. itially flush the installed piezometer tubes with prepared de aired water and to ensure that all entrapped air is removed to provide a hydraulically tight system It is only necessary to use the de airing unit after initial flushing if further air migrates into the system from the piezometer tip This will become apparent from future readings 2 04 De aired Water Boiler The de aired water boiler provides a means of preparing and storing de aired water and vacuum The water is transferred to the de airing unit under controlled conditions to prevent ingress of air 2 05 Portable Readout Unit The portable readout unit is transported to the installed terminal cabinet and a hydraulic flylead is plugged into one of the terminal manifolds Each piezometer pressure is monitored by opening the appropriate valve on the manifolds Two types of readout are available a the Digital Pressure Indicator or b the Hydraulic Logger The digital pressure indicator is a simple read only readout where the results have to be manually noted The hydraulic logger is a state of the art electronic data retrieval unit Readings are automatically logged and held on dedicated files which can be downloaded at a later date for processing User Manual Section 3 Principle of Operation The hydraulic twin tube piezometer is essentially a filter pot installed at the required elevation in boreholes at the base of a trench Two small bore nylon tubes coated in natural poly
19. lacing the de aired water in B and forcing out any remaining air If the air were to be removed by applying a vacuum at G there is a risk of damaging the vacuum pump by drawing water into it Any bubbles of air that cling to the rubber bladder and walls of the tank B should be dislodged by slapping the sides of the tank until they rise and accumulate under valve G They may then be removed with pressure in tank A and momentarily opening Valve G It is important that cylinder B is completely filled with de aired water and all air excluded Release pressure from tank A by opening Valve E and close all valves Attach the black vacuum hose to E open Valves E L and I and by evacuating tank A water is drawn from inside the bladder to tank A thus drawing de aired water from tank C into tank B When the bladder is fully deflated tank A will again be seven eighths full of water Close Valves E L and I Remove the vacuum hose from E and release the vacuum in tank A by opening E Close all valves Open Valves I and M to drain the water from tank C Close all valves The panel is now fully charged with de aired water and ready for operation User Manual Section 5 Operation and Recharging Attach the black vacuum hose to Valve I Open Valve K Operate the pressure pump until the desired pressure is reached in tank A as indicated by the pressure gauge Having calculated the optimum de airing pressures if a vacuum is required on the return side open Va
20. le care is taken Although components in the unit are relatively robust for such conditions they will not survive mishandling or neglect X User Manual Treat all items with respect and handle with care Insure Logger is protected from shock during transit If loose transport on a seat in the vehicle cab or secure firmly to the vehicle body If the conditions are very rough the best solution is to carry the instrument on your lap Your body will damp the shocks but not produce the oscillations of sprung materials Keep the Logger battery fully charged using only the charger supplied But see note above about periodic full discharge Wipe the front panel after use Do not allow sharp objects to damage the membrane front panel Do not store leads pens pencils etc in the lid of the carrying case this may damage the membrane panel Do not expose the readout to temperatures outside the range of 10 to 65 degrees Centigrade 29 Appendix A Pressure Logger Model 1019 Front Panel Layout ON BATIERY CHARGER a NA User Manual 30 Appendix B Summary of Basic Keypad Operation The Logger may be used in a READ ONLY mode or LOGGING mode a For READ ONLY Operation First operation is to decide and set up the Engineering Units required to be read on a single channel Switch Logger on by pressing O
21. logger s display resolution it is used to limit the logger s resolution to that of the rest of the system 14 05 Log Functions IMPORTANT Log functions are disabled in READ ONLY MODE Function 1 Read Log If no measurements have been saved the LOG EMPTY is shown on the display If the Log contains more than one date then the user is prompted to select the date the display showing LOG ENTRY DATE 26 08 96 PRESS SAVE TO SELECT User Manual 23 The default date shown is the latest date in the Log The T and 4 keys will then move up and down the Log by date If the Log only contains one date then the above prompt does not appear The Log display is identical to READ MODE except that a Log Index number appears on line 2 of the display The larger the index number the more recent the Log entry The 1 and Y keys scroll through the Log entries A Function 2 Copy Log or Table to RS 232 Port Copies either the entire Log contents or active Table entries to the RS 232 Port in ASCII format suitable for Lotus compatible spreadsheets The user is first prompted to select either the Log or the Table using the 1 or 4 keys followed by SAVE to select If Log Dump was selected and no measurements have been saved then LOG EMPTY is shown on the display If Table Dump was selected then only active entries for channels 001 999 will be dumped The user is prompted to press 1 key to start either the Log or
22. lve I and operate the vacuum pump until the desired vacuum is reached as indicated by the vacuum gauge Pressurised de aired water from the supply tank B may now be introduced into the terminal SEND manifold by connecting the flylead from Valve P The flylead from Valve V is connected to the terminal RETURN manifold INFORMTION In certain circumstances no pressure may be required in tank A in which case close tank K and vent tank A to atmosphere by opening valve E During operation of the unit the bladder in tank B should not be allowed to distend to more than three quarters of the volume of the tank At this point it is necessary to recharge with de aired water as follows Close Valves P and V to isolate the manifolds from the de airing unit Open Valves E and I to release the pressure and vacuum from the tanks as indicated by zero reading on the gauges Close all valves Drain tank C by opening valves I and M Attach the black vacuum hose to valve I and the de aired water supply to valve M Operate the vacuum pump and draw de aired water into tank C until three quarters full Close Valves M and I Continue as in sections 6 1 8 and 6 1 9 ensuring that the water in tank C does not empty while being drawn into tank B avoid drawing air into tank B User Manual Section 6 Calculation of De Airing Pressures Consider a piezometer tip in the soil during the de airing process as
23. mal maintenance is described in section 12 Soil Instruments Limited has a policy of continual improvement and may alter parts of this document without notice User Manual Section 2 The Equipment 2 01 General Details The terminal system described here refers to a simple remote reading and flushing procedure for twin tube hydraulic piezometers The terminal panel provides a pair of valved manifolds for the two hydraulic lines from the buried piezometer The manifolds serve two purposes a a means of directing de aired water to each piezometer in the system and b providing a switching means to read each piezometer when a portable readout is connected 2 02 Terminal Cabinet The terminal cabinet comprises a lockable corrosion protected steel enclosure mounted on a concrete plinth A plastic duct tube enters the base of the cabinet which provides entry of the piezometer tubes The tubes from each installed piezometer are routed to the terminal manifolds one tube to the top SEND MANIFOLD and one tube to the lower RETURN MANIFOLD Each tube is terminated at its appropriate valve at the manifolds One end of each manifold has a quick connector to accept flying leads from a portable de airing unit and readout equipment A paraffin heater is available to protect the hydraulic piezometer circuit within the terminal cabinet during freezing conditions 2 03 Portable De airing Unit The small portable de airing unit is necessary to in
24. nt value by one respectively ia Channel No 000 999 default is last used Units default is blank blank bar kg cm2 kN m2 mH20 mHg Ib in2 The units scale factors used are blank 1 0 bar 1 0 kg cm2 i 1 0197 kN m2 100 0 mH gt 0 10 215 ftH50 33 515 mHg i 0 75006 psi 14 504 Mpa 0 100 Kpa 100 00 A Function 5 Set Clock Calendar Prompts user to enter date time Function 6 Set SERIAL Parameters Set baud rate 9600 4800 2400 1200 600 300 110 Set parity none odd even Set data bits 7 8 bits Set stop bits 1 2 14 07 System Functions Function 7 Battery Status User Manual 25 Displays rechargeable battery volts Also shows number of logged entries used and free entries remaining provided not in READ ONLY MODE Function 8 LCD Backlight Select LCD Backlight ON OFF using 7 and 4 keys followed by SAVE to select A Function 9 Zero Allows the operator to reset the zero offset of the Logger s transducer The current reading is set as the zero and the user must take the appropriate steps to ensure this is a representative zero if subsequent readings are required to be accurate i e all pressure must be bled off from the send line by releasing any pressure trapped in the BLACK quick release socket When a transducer box is fitted trapped pressure can be released by depressing the valve on the Male quick Release Connector or by loosening off the water reservoir
25. r cap using the special spanner provided Open Valves V and S Pour in clean water to within 100mm of the top Connect the electrical cable to a suitable mains supply either 10V or 230V as indicated on the immersion heater coil cover Switch on at the mains Bring to the boil and allow to boil for fifteen minutes Switch off at the mains supply and unplug Close Valves V and S replace the central filler cap Allow to cool WARNING Although the cap is fitted with a pressure relief valve never boil with the filler cap on IMPORTANT With a partial vacuum inside the boiler never open Valve S before opening Valve V as this will draw air into the de aired water SAFETY REQUIREMENTS The 4 psi Pressure Relief Valve in the centre of filler cap must be checked at intervals not exceeding 12 months by a competent person User Manual Section 4 The Portable De Airing Unit 4 01 General Details The de airing unit consists essentially of pressure supply and return tanks A B and C and gauges to measure water pressure and vacuum during circulation of de aired water All these components are mounted on a frame complete with valves and connecting pipework Pressure and vacuum pumps are used to operate the equipment Pressure is applied to the de aired water in supply tank B by forcing water from the pressure tank A into the bladder in B Water from the supply tank may then be circulated through the terminal manifolds and piezometer tubes back
26. soil Hydraulic Piezometer Terminal Equipment With Pressure Transducer amp Pressure Logger Readout User Manual Man 082 2 0 2 07 08 14 C Spalton Andy Small Chris Rasmussen Manual No Revision Date Originator Checked Authorised for Issue 1 User Manual Contents Section 1 Section 2 2 01 2 02 2 03 2 04 2 05 Section 3 3 01 3 02 3 03 Section 4 4 01 4 02 Section 5 Section 6 Section 7 Section 8 8 01 Section 9 9 01 Section 10 Section 11 11 01 Section 12 12 01 Section 13 13 01 13 02 13 03 Section 14 14 01 14 02 14 03 14 04 14 05 14 06 14 07 Section 15 15 01 15 02 Section 16 Appendix A User Manual ORC ON Oi ee O TON 4 The EGUMEN tonio uu Beer errno dpt mG I cd stehe mI ar M ES SEE E E tU UM Ub Os 5 Genera DETAI EE I T 5 LES gallerie E T T ona ae aes na cd vet a as se kd nt ss ae ang deca ohana aaa nn 5 Portable Desallti g UI act chive eek dio ades ide vox ae aw ee ud 5 De alred Water BOET ssceci titi tete n EHE eR DR E Fbxp ESI PENES FEN ER Ve GU e x Feb PI EX tad FREI xu Dag d 5 Portable Reddout HDI etm Dassin vie ae uxende xau tin Desatku lo Mos Te uasa A cade Od duran au tuas cu EAR iai 5 Principle of ODperallon oe soie UR eu hi c c iene vu cl D 6 Installation of the Terminal Cabinet eeeseesseseeseeeeeeee eene nnn rana 6 Terminating the Piezometer TUDGS cccccsssseec
27. thene are routed in a trench back to a permanent terminal point The two nylon tubes are filled with de aired water to provide a hydraulically tight circuit Changes in pressure at the piezometer tip are transmitted within the de aired water to the terminal unit The piezometer pressure is measured by connecting a portable pressure transducer to the terminal unit The true piezometric pressure is then calculated taking account of the installed levels 3 01 Installation of the Terminal Cabinet The terminal cabinet is installed onto a pre cast concrete plinth in a vertical position above the inlet duct through which the piezometer tubes pass The cabinet is placed onto rag bolts and secured by nuts and washers from inside the cabinet Timber formwork is supplied with each cabinet to assist casting of the concrete plinth 3 02 Terminating the Piezometer Tubes The piezometer tubes are prepared by stripping sufficient polythene sheath to allow each nylon tube to connect with the appropriate pair of valves on the two manifolds 3 03 Preparing De Aired Water Up to 50 litres of de aired water can be prepared in the boiler at one filling An immersion heater coil heats the water to boiling thus expelling any air or gases in solution By sealing the boiler and allowing it to cool the steam and water vapour above the water condenses thus creating a partial vacuum inside the boiler This prevents further solution of air or gases Remove the central fille
28. tied Keep the foot pumps in a clean condition preventing water from being drawn in during use Should the pump performance deteriorate it is likely that water has affected the internal leather cup washer The pump will require strip down cleaning and drying and the cup washer re oiling with light mineral oil The readout is a sensitive precise unit and must always be treated with reasonable care Irreparable damage will be caused to the electric transducer if allowed to freeze It is therefore important to protect the unit from freezing at all times when not in use Check all pipework valves etc for leaks at regular intervals and keep connection clean Always replace dust caps back onto quick connectors after use Wipe down the de airing unit cylinders and frame with dry cloth after use Regularly check the de aired water boiler safety relief valve and ensure that the valves are never obstructed Regular electrical tests must be carried out on the immersion heater by a qualified electrician User Manual 15 Section 10 Memory Loss The CMOS ram in SIL portable loggers is maintained when the logger is turned off by the main rechargeable battery or if this battery becomes exhausted by a small on board back up battery From a fully charged state these two batteries will maintain the logger s memory including its calibration values for several months Therefore to ensure that calibration constants and data are not lost we recommend t
29. y the key will then deselect this mode FN Exits Read Mode and allows the user to enter the required function 14 03 Function Mode Functions are selected by pressing the FN key followed by either 0 9 to directly select the function or T or 4 to view the possible functions and then the appropriate digit to select The eight possible functions are grouped into four displays as follows DISPLAY 0 DISPLAY UNITS 22 Actually factory configuration LOG FUNCTIONS 1 READ 2 DUMP 3 CLEAR CONFIGURATION 4 TABLE 5 CLOCK 6 SERIAL SYSTEM 7 STATUS 8 LIGHT 9 ZERO Pressing the FN key at any time causes the instrument to immediately revert to Read Mode 14 04 Factory Configuration Function 0 Factory Configuration This function first shows the current zero offset You should either enter a new zero value and press SAVE or press FN to abort This value is set during factory configuration and should not normally be modified This function next shows the current gain factor You should either enter a new gain factor and press SAVE or press FN to abort This value is set during factory configuration and should not normally be modified This function next shows the logger resolution You should either enter a new resolution and press SAVE or press FN to abort This value is set during factory configuration and should not normally be modified Note that this value refers to the
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