DCX Data Logger Operating Instructions
Contents
1. The ring seals must be replaced if they show evidence of damage 17 x 1 5 see accessories It is also important to ensure that the O rings are not damaged when remounting the sleeve The battery capacity indicator is automatically set to 99 again each time a battery is replaced voltage interruption This also occurs if the same battery or a discharged battery is inserted The battery should for this reason only be replaced when it has been ascertained that it is truly flat KELLER AG fur Druckmesstechnik DCX Operating Instructions Care Caution The pressure sensor membrane is extremely delicate The membrane must therefore never be touched lt is recommended that the pressure sensor be cleaned carefully from time to time if the data log ger is being used in extremely dirty or contaminated media DCX 22 AA battery housing The knurled nut battery sleeve and protective sensor sleeve should be removed if the pressure sensor is to be cleaned effectively see illustration on left Please ensure that the delicate membrane is not damaged Rinse the sen sor off with clean water It is imperative that water be pre vented from pene trating through to the battery chamber during this opera tion This can be prevented by simply mounting the battery sleeve during cleaning see illustration on right Ensure that all components are dry before mounting the sleeves The battery should only be replaced in dry ambient air2. The protective sensor sleeve is then mounted with the holes facing downwards This is fol lowed by the battery sleeve which can only be mounted in one direction It must also be en sured during assembly that the O rings are not damaged as it is then imperative that these be replaced 17 x 1 5 The knurled nut is subsequently screwed into position DCX 22 AA lower pressure sensor The protective cap cannot be removed Simply rinse the sensor off under flowing water WARNING Do not attempt to remove the protective cap with a sharp object as this can destroy the pressure sensor DCX 22 DCX 22 SG DCX 22 VG The black cover is pulled off to clean the pressure sensor The sen sor can then be rinsed off with water Under no circumstances must pressure be applied to the deli cate pressure sensor membrane as this can destroy this ele ment a KELLER AG f r Druckmesstechnik DCX Operating Instructions Accessories Scope ofdelivery _ Illustration Product No Closure cap for connection socket aciudedan with hexagonal socket screw INOX 506815 0010 a delivery M3x6 for fixing Seeger circlip ring DIN 471 BN 682 Included in 508830 0002 delivery O 18 Battery suitable for DCX 22 DCX 22 SG VG AA Included in ERLE n 557005 0010 delivery Brand Sonnenschein Lithium 3 6V AA type SL 760 h K 103A interface converter For communication between the PC and the DCX Optional 309010 0002 Connect
3. screwed onto the DCX and secured with the Seeger circlip ring supplied see accessories It should be noted that the cable length selected initially for the DCX 22 AA SG VG is a fixed dimension and cannot be changed The desired cable length should therefore be specified when ordering KELLER AG f r Druckmesstechnik DCX Operating Instructions Application example DCX 22 AA installation The sinking pipe is secured firmly at the measuring location Openings should be provided above ground level if the sink ing pipe is buried in the ground These ensure that water can enter The sensor is lowered into the sinking pipe It is connected by the cable to the housing The housing contains the elec tronics the battery and the air pressure sensor The adapter ring is screwed onto the electronics housing and rests on the edge of the sinking pipe The system can be connected on site to a laptop using a data cable The stored measuring values can now be read out or the instrument can be reconfigured DCX configuration read out A converter is required to establish a connection between the instrument and the PC for configur ing or reading out the DCX The K 103A interface converter is utilized to establish a connection to the serial interface RS 232 However a K 104A converter is required if the logger is to be con nected to a USB interface see accessories The USB driver supplied with the instrument should be instal
4. the instrument itself The DCX 22 can be utilized with extreme flexibil ity due to the fact that it has no cable In contrast to the DCX 22 the DCX 22 SG is fitted with a cable with a read out connector on its end It is therefore possible to read out the DCX 22 SG without removing it from the meas uring position The DCX 22 AA has a second absolute pressure sensor integrated in the read out unit which acts as a barometer and automatically calculates the difference between the two measuring values This enables a direct read out of the water level The advantage of this solution when compared with the DCX 22 VG which utilizes a reference tube for air pressure compensation is that the entire system is hermetically sealed against exterior influences The disadvantage is that the resolution is slightly less than that of the DCX 22 VG The maximum measuring range is limited to 10mWC due to signal loss in the cable between the sensor and read out unit DCX 22 AA KELLER AG f r Druckmesstechnik Installation DCX 22 DCX 22 AA VG 7 Va a E Read out units C Oo D aE pe SIIS on O g O Cc Cc gt a D E lt A el jl O E iz peers line of sensor Qs pee DCX Operating Instructions DCX 22 SG E 4 Rope Water surface H iS E DCX 22 zo The data loggers are lowered into the sinking pipe and fixed in position with an adapter ring see acces sories The respective adapter ring is
5. East Kingsway Business Centre PO Box 84 18 Welcome Street Mid Craigie RD Dundee Scotland UK Arroyo Grande California 93420 Parkes NSW 2870
6. KELLER AG ftr Druckmesstechnik DCX Operating Instructions DCX Data Logger Operating Instructions Version 1 04 November 2004 General information Fluid levels or fluctuations of a liquid can be determined by measuring the prevailing pressure at a lower depth and comparing it with the pressure at the surface This enables an approxi mate calculation based on the density of the liquid For example in the case of water 100mbar 100cm water column WC Measuring is always realized in relation to the ambient pressure the pressure on the surface in the case of open systems or classical filling level measurement This is achieved in conven tional water level sensors through a reference tube integrated in the sensor cable which de termines the relationship to the ambient pressure Measurement of air pressure fluctuations is thus independent An alternative option exists in intelligent systems involving the realization of an absolute pressure measurement and calculation of the air pressure correction using an ad ditional barometer This means that the special cable with the reference tube need not be utilized KELLER provides a variety of data loggers depending on the measuring method employed Measuring methods Relative measurement DCX 22 VG The DCX 22 VG is based on the classical level measuring method The instrument is equipped with a relative pressure sensor The air pressure is conveyed through the reference tube integrated
7. in the sensor cable at the rear of the sensor The cable should therefore not be bent or crushed The upper end of the reference tube is fitted with a GORE TEX membrane This prevents dirt or liquid entering the instrument while still ensuring the air exchange DCX 22 VG UK Europe Office USA Canada Office Australia Asia Pacific Office Tel 44 0 845 9000 601 Tel 1 866 849 3441 Tel 61 0 282 442 363 Fax 44 0 845 9000 602 Fax 1 866 628 8055 Fax 61 0 294 751 278 Measurement gt Control gt Data Acquistion info omniinstruments co uk info omniinstruments net info omniinstruments com au www omniinstruments co uk East Kingsway Business Centre PO Box 84 18 Welcome Street Mid Craigie RD Dundee Scotland UK Arroyo Grande California 93420 Parkes NSW 2870 ie KELLER AG f r Druckmesstechnik DCX Operating Instructions Absolute measurement DCX 22 DCX 22 SG DCX 22 AA The DCX 22 and DCX 22 SG instruments utilize an absolute pressure sensor A second DCX 22 is positioned on the surface as a barometer where low water depths are involved as the in fluence of air pressure fluctuations must also be taken into consideration and the air pressure characteristic is recorded The water level is then calculated in the PC program Logger 4 x as the difference between the two measured values DCX 22 DCX 22 SG The DCX 22 should be pulled out of the measuring position to read out the data The interface connector is located in
8. ion to serial interface RS 232 RS 485 converter K 104A interface converter For communication between the l PC and the DCX Optional 309010 0009 Connection to USB interface USB RS 485 converter CD software Logger 4 X Contains programs for DCX configu ration and read out The software can also be downloaded free of i charge in the internet Optional 539005 0003 gt www keller druck com under Products Pressure Trans mitters gt Autonomous Data Collec tors 2 sinking pipe closure Optional 506815 0009 ring Spare part gt 508610 0024 17x15 pare p sT KELLER AG f r Druckmesstechnik DCX Operating Instructions Adapter rings for use with sinking pipe optionally available Suitable for DCX 22 SG DCX 22 VG DCX 22 AA round version Dimensions mm Drawing No Product No Sank 33386 item 4 506810 0019 N es BEE 33386 item 9 506810 0025 Adapter ring for 2 sinking pipe closure with opening for sounder Opening for DCX M20x1 5 Product No 33386 70 506810 0021 Opening for sounder 16mm UK Europe Office USA Canada Office Australia Asia Pacific Office Tel 44 0 845 9000 601 Tel 1 866 849 3441 Tel 61 0 282 442 363 Fax 44 0 845 9000 602 Fax 1 866 628 8055 Fax 61 0 294 751 278 Measurement gt Control gt Data Acquistion info omniinstruments co uk info omniinstruments net info omniinstruments com au www omniinstruments co uk
9. led when using this converter One end of the cable fitted to the converter is then plugged into the DCX the other end is con nected to the PC The Logger 4 x software can now be started on the computer Caution The DCX must not be disconnected from the interface during communication writing reading out online function The program must always be terminated before unplugging the instrument KELLER AG fur Druckmesstechnik DCX Operating Instructions Replacing the battery eo Battery Sonnenschein 3 6V lithium AA type SL 760 see accessories The DCX should be dried prior to opening to prevent water entering the instrument during open ing The data logger should only be opened or closed in dry ambient air DCX 22 AA VG SG The battery is replaced by first removing the knurled nut followed by the battery sleeve Knurled nut DCX 22 The bracket and knurled nut should be unscrewed first in the case of the DCX 22 The battery sleeve can then be removed Note lt is recommended that the battery be first shorted for approx a half a second prior to insertion This is necessary because the voltage is no longer at nominal level after a longer period of stor age The battery is effectively reactivated by shorting it Please note the correct polarity when inserting the new battery see symbol on battery bracket This opportunity should also be used to check the black O rings which seal the battery chamber
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