Operating instructions Bubble Sensor OTT CBS
Contents
1. Standard SDI 12 interface level measurement measuring range not scaled metric system water level measurement 21 9 SDI 12 Commands and Response 9 1 Standard commands The following SDI 12 standard commands are implemented in the OTT CBS Command Response Description a a lt CR gt lt LF gt Acknowledge active al allcccccccemmmmmm Send Identification VVVXXXX lt CR gt lt LF gt OTT CBS Response 13OTT HACH CBS107 aAb b lt CR gt lt LF gt Change Address a lt CR gt lt LF gt Adress Query aM atttn lt CR gt lt LF gt Start measurement in normal mode The measured values are output as follows DO Level m resolution 0 001 m D1 Level cm resolution 1 cm D2 Level ft resolution 0 01 ft D3 Pressure mbar resolution 0 1 mbar DA Pressure psi resolution 0 001 psi D5 Temperature C resolution 0 1 C D Status see command av aD0 a lt wert lt CR gt lt LF gt Send data The answer looks as follows a device address lt values gt pd d 1 000 level value maximum of 9 characters per value and 35 characters per query If several measured values are queried it may be necessary to continue with fur ther queries e g aD1 av atttn lt CR gt lt LF gt Start verification The verification lasts 1 second and provides a value representing the test result DO a 0 lt CR gt lt LF gt no error DO a 1 lt CR gt lt LF gt level too low lt 5 c2. Grr ces so Measuring tube JL id t 1 metal tube Direction of flow 1 JL Jl m JU eA Bubble pot le 5 1 Installing bubble chamber for surface water We recommend using the Bubble Pot EPS 50 for measurements in surface waters See Bubble Pot EPS 50 installation instructions for information on its installation Fig 6 Installing bubble chamber for ground water When lowering the bubble chamber the cover must be in position B The cover prevents water entering the measuring tube during installation During initial startup over pressure builds up in the measuring tube As a result the cover falls back to position A and opens the 10 measuring tube in the process 5 2 Installing bubble chamber for ground water To install the bubble chamber for ground water proceed as follows Determine depth of the bubble chamber e g using a contact gauge The bubble chamber must be positioned under the lowest expected water level Depth distance from bubble opening to upper edge of the top cap Push the measuring tube into the cable gland of the bubble chamber as far as it goes Tighten the cable gland firmly by hand Cut suspension cable to length suspension cable length depth 125 cm to protect the suspension cable from being twisted off it can be
3. 14 6 4 Connecting the OTT CBS to LogoSens 2 or DuoSens using an SDI 12 interface Method A Connect the OTT CBS via the SDI 12 interface protocol and physical interface SDI 12 The maximum length of the cable is 70 m Recommended cable cross section 0 25 mm Connect the OTT CBS as shown in Figure 9 to the LogoSens 2 Station Manager or to the DuoSens Compact Data Logger Take note of the operating instructions for the LogoSens 2 DuoSens LogoSens 2 DuoSens A R T A Ll SDI 12 SDI 12 nor SESH PHN om 9999 gt o ZE 1 Leg OS SS SOS Hl E L B B CBS CBS Method B Connect OTT CBS using the physical RS 485 interface SDI 12 pro tocol via physical RS 485 interface The maximum length of the cable is 1 500 m Recommended cable type Unshielded twisted pair cable recommended cable cross section 0 25 mm Connect the OTT CBS as shown in Figure 10 to the LogoSens 2 Station Manag er or to the DuoSens Compact Data Logger Take note of the operating instruc tions for the LogoSens 2 DuoSens LogoSens 2 DuoSens A R A RS 485 RS 485 mu OOD m 9999 eo 2 0 meet O
4. SDI 12 interface ON a ON M 12345678 12345678 SDI 12 via RS 485 interface SDI 12 via RS 485 interface without termination with termination Possible types for the SDI 12 interface Standard SDI 12 interface protocol and physical interface SDI 12 SDI 12 via RS 485 interface without termination SDI 12 protocol via physical RS 485 interface Use this setting if multiple OTT CBS are connected in parallel to one RS 485 cable bus operation for all OTT CBS except the last device at the end of the bus SDI 12 via RS 485 interface with termination SDI 12 protocol via physical RS 485 interface Use this setting if multiple OTT CBS are connected in parallel to the RS 485 cable bus operation for the last device at the end of the bus or if only one OTT CBS is connected to the RS 485 cable 19 8 2 Setting measurement type of the 4 20 mA interface to level or depth measurement Fig 16 Setting measurement type level or depth measurement of the OTT CBS 4 20 mA interface 123 45 6 7 8 Depth Measurement 8 3 Scaling the measuring range for the 4 20 mA interface With DIPs 5 and 6 you can scale the available measuring range 15 or 30 m of an OTT CBS to a smaller range Where the whole measuring range is not required this has the advantage that a higher resolutio
5. Operating instructions Bubble Sensor OTT CBS We reserve the right to make technical changes and improvements without notice Table of Contents 2 3 10 12 13 14 Scope of supply Order numbers Introduction 3 1 Function 3 2 Status LED Installing OTT CBS 4 1 Preparing the OTT CBS for installation 4 2 Fastening OTT CBS 4 3 Connecting measuring tube to OTT CBS Installing bubble chamber 5 1 Installing bubble chamber for surface water 5 2 Installing bubble chamber for ground water Connecting OTT CBS 6 1 Connecting power supply 6 2 Connecting the OTT CBS to any datalogger using an SDI 12 interface 6 3 Connecting the OTT CBS to any datalogger using a 4 20 mA interface 6 4 Connecting the OTT CBS to LogoSens 2 or DuoSens using an SDI 12 interface 6 5 Connecting the OTT CBS to LogoSens 2 or DuoSens using a 4 20 mA interface Activating the purge function Setting operating parameters using DIP switches 8 1 Setting the type of SDI 12 interface 8 2 Setting measurement type of the 4 20 mA interface to level or depth measurement 8 3 Scaling the measuring range for the 4 20 mA interface 8 4 Setting the measuring system for the 4 20 mA interface 8 5 Setting measurement type of the 4 20 mA interface to water level or pressure measurement 8 6 Factory setting of the operating parameters SDI 12 Commands and Response 9 1 Standard commands 9 2 Advanced SDI 12 commands Determining t
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7. Volt max load resistance 450 Ohm The OTT CBS delivers an output current corresponding to the measured value for a load resistance of up to 450 Ohm Dimension the connected electrical circuit accordingly Check the input resistance of the connected peripheral device for this purpose 1000 900 800 700 600 500 400 300 200 100 11 Carrying out maintenance work The OTT CBS bubble sensor itself is maintenance free We recommend that the measuring tube and bubble chamber are checked at regular intervals as des cribed below and cleaned as required 11 1 Activating purge function Activate the purge function of the OTT CBS quarterly by pressing the membrane button Pump see also Fig 14 and checking whether air bubbles rise out of the bubble chamber If not check whether the bubble chamber is blocked and or whether the measuring tube is leaking or blocked 11 2 Cleaning bubble chamber Check the bubble chamber quarterly for sand buildup and weed infiltration For light sand buildup clean the bubble chamber using the purge function and for heavier buildup or weed infiltration clean the bubble chamber carefully manually do not change the position of the bubble chamber 11 3 Testing the measuring tube After 15 years operation test the measuring tube for tightness pressure resis tance roughly every 2 years Never open the housing of the OTT CBS There are no adjustment or contr
8. melted with a cigarette lighter for example Feed the suspension cable through the hole in the bubble chamber as shown in Figure 6 and tie firmly Slide cover into position B upwards see Fig 6 Suspension cable bubble chamber Measuring pipe Cable i gland iz 3 Bubble opening Cover in position B ON Cover in position oe E Hole Er Bubble pot Fig 7 Installing bubble chamber for ground water attaching suspension cable As shown in Fig 7 attach the suspension cable of the bubble chamber to the retainer on an OTT top cap already mounted The retaining plate allows a fine height adjustment afterwards Secure the suspension cable against slipping with a knot If top caps without retainers are used ensure the suspension cable is attached securely Check all knots and attachments for correct position and firmness Lower the bubble chamber slowly into the observation well with the suspension cable Feed the measuring tube out of the observation well through a hole Top cap U Retainer i 7 x Measuring tube Retaining plate ee I Observation well EN Securing knot b 1 Suspension cable u bubble chamber n Lu 11 Fig 8 Assignments for the screw terminal 12 strips A and B of the OTT CBS 6 Connecting OTT CBS The OTT CBS has the following inte
9. pressed The Status LED lights for approx 2 seconds With an activated purge function the CBS pumps a large amount of air through the measuring tube for the required time period see also Chapter 11 The purge function can also be activated via an SDI 12 command Note Press the membrane button for at least one second as otherwise the error memory is called and displayed at the Status LED Sri ces em Membrane button Fig 15 Setting the type of SDI 12 interface of the OTT CBS 8 Setting operating parameters using DIP switches The eight DIP switches are behind a cover on the underside of the OTT CBS see Figure 1 The following operating parameters can be set with them DIP 1 2 3 Setting the type of SDI 12 interface DIP 4 Setting measurement type as level or depth measurement DIP5 6 Scaling measuring range DIP 7 Setting metric or imperial system m mbar or feet psi DIP 8 Setting measurement type as water level or pressure measure ment these settings only affect the 4 20 mA interface 8 1 Setting the type of SDI 12 interface With DIP 1 3 select the type of SDI 12 interface of the OTT CBS screw terminal strip B contacts 1 to 4 Please also take note that only one of the interfaces can be used in each case 4 20 mA or SDI 12 no parallel operation of the inter faces 123 45 6 7 8
10. S SS SS SOS i E L E B B CBS CBS Fig 11 Adjusting the operating parameters of the LogoSens 2 DuoSens SDI 12 Master function block The function block OTT SDI RS485 is set in the same way Configuring the LogoSens 2 DuoSens for the OTT CBS with SDI 12 interface Create a LogoSens 2 DuoSens channel with SDI 12 Master or OTT SDI RS485 function block serial sensors tab Apply the following settings SDI 12 Master Terminal block gt Measurement mode M v Slave address fo z Value no 13 Value no Virtual Terminal ID Value no Virtual Terminal ID 2 3 foer es f 3 Fa fos aa F Terminal block LogoSens 2 A R DuoSens SDI 12 Master A 3 4 specified DuoSens OTT SDI RS485 A 1 2 specified terminal block used screw terminal strip of the LogoSens 2 DuoSens Slave address SDI 12 bus address Each slave address may only be allocated once to an SDI 12 bus line checking setting see operating instructions LogoSens 2 DuoSens Chapter SDI 12 transparent mode Typical setting 0 only one OTT CBS is con nected to the terminal block no bus operation Value no Identifies which value the xth of n values of the OTT CBS is recorded in this channel Typical set ting I first of seven values level in m Measurement mode MI For the maximum 7 values of the OTT CBS Value no Allocation of the further six values of the OTT CBS Virtual Terminal ID to virtual terminals level in cm l
11. Station Manager or to the DuoSens Compact Data Logger as shown in Figure 12 Take note of the operating instructions for the LogoSens 2 DuoSens Maximum cable length recommend ed cable cross section Ensure that the ohm cable resistance together with any resistor present does not exceed the maximum permitted load resistance see Chapter 10 LogoSens 2 DuoSens A R C F 4 20 mA Ei 4 20 mA LL vot PO O 100 Ohm resistor Ugat GND A 2 Qo DN 2 mu 9999 GND Ugat analog extension only VE GT DuoSens with Q Q amp Q i Configuring the LogoSens 2 DuoSens for OTT CBS with 4 20 mA interface Create a LogoSens 2 DuoSens channel with function block I 4 20 mA LogoSens 2 or U I Pt100 DuoSens Analog sensors tab Apply the following settings I 4 20m Terminal block Sensor lag time s Error code if range overflow V External Auxiliary sensor supply via relay contact at terminal block U gt GND lt 11V Terminal block Measuring mode only with DuoSens Sensor lag time s LogoSens 2 A R DuoSens C F terminal block used screw terminal strip of the LogoSens 2 DuoSens Set to 4 20 mA ext switches on the LogoSens 2 DuoSens input x seconds before the actual measureme
12. T CBS 4 1 Preparing the OTT CBS for installation If necessary and you have not already done so set operating parameters with DIP switches see Chapter 8 4 2 Fastening OTT CBS The OTT CBS is designed only to be installed on top hat rails a section of top hat rail is supplied with the OTT CBS Choose a dry and dust free location for the installation such as a gage station or control cabinet First attach the OTT CBS on the upper edge of the top hat rail and then press the underside against the top hat rail until it clicks into place Demounting OTT CBS First press one locking device downwards and pull the OTT CBS slightly for wards at this point Press the second locking device downwards and remove the OTT CBS upwards from the top hat rail a FT1 51 T I T 1 Top hat rails Locking device Fig 4 Connecting measuring tube on OTT CBS 4 3 Connecting measuring tube to OTT CBS To install the measuring tube on the OTT CBS proceed as follows Measuring tube with 2 mm internal diameter Cut off the end of the measuring tube square with a sharp knife and push onto the factory fitted connection nipple Maximum length of the measuring tube 100 m Measuring tube with 4 mm internal diameter Cut off the end of th
13. ates arising for approx two minutes Notes Interrupt displaying error states press membrane button briefly If no error state has arisen the LED lights once for a longer period as con firmation 13 Note about the disposal of old devices In accordance with the European Union guideline 2002 96 EC OTT takes back old devices within the member countries of the European Union and disposes of them in an appropriate way The devices concerned by this are marked with the symbol shown aside For further information about the return procedure please contact your local sales contact You will find the addresses of all sales partners in the internet on www ott hydrometry com Please take into consideration also the national implementation of the EU guideline 2002 96 EC of your country 14 Technical Data Measuring ranges Standard USGS specification version 30 m measuring range version Resolution Accuracy SDI 12 interface Standard 30 m measuring range version USGS specification version Accuracy 4 20 mA interface Measuring dynamics max level change Units Interfaces Power supply Current consumption Query interval 1 min Query interval 15 min Dimensions L x W x H operating display elements DIP switches Pump membrane button Status LED Weight Housing material Type of protection Temperature range Operation Storage Relative humidity Measuring tube internal diameter Length EMC limits Resistance to electrostatic disc
14. e measuring tube square with a sharp knife Remove cap nut width across flats 10 and pull off the short factory mounted measuring tube from the connection nozzle Push cap nut over the measuring tube 4 mm Push measuring tube onto the connection nozzle Push the cap nut back onto the connection nozzle and tighten by hand Maximum length of the measuring tube 75 m Measuring tube with 1 8 internal diameter A special pipe fitting for the 1 8 internal diameter measuring tube is available accessory Please follow the instructions delivered with the pipe fitting for installing the pipe Maximum length of the measuring tube 100 m Pump Connection nozzle Cap nut Connection nipple Measuring tube 2 mm Measuring tube 4 mm Fig 5 Routing requirements for measuring tube 5 Installing bubble chamber Please ensure the following points are noted during installation No contamination or moisture may be allowed into the measuring tube When immersing the bubble chamber only EPS 50 the OTT CBS must be activated so that the piston pump is operating during this process Do not damage or kink the measuring tube during installation Lay the measuring tube such that there is a continuous drop from the OTT CBS towards the bubble chamber Otherwise moisture could collect in a hollow and potentially block the tube with the formation of drops see Fig 5
15. er battery or solar power The OTT CBS contains a purge function This clears the measuring tube and the bubble chamber of any minor contamination by pumping a large volume of air into the measuring tube By using an intelligent pump strategy no air drying unit is necessary for the measuring range of O 15 m Status Status LED O Button for activating the purge unit Hose connection for measuring tube DIP switch tment Se ane MER Terminal blocks A and B Air filter for for connecting the datalogger incoming air and power supply For the display of any error states that may occur the OTT CBS has a Status LED see Fig 1 Various operating parameters can be set using the eight DIP switches Fig 2 The main layout of a level station with OTT CBS bubble sensor Measuring tube EXE bn PE f 1 f TT 77 i 777 LU Mee SS FS Y d I Y ER EN EE NES E C IC i Js HOU j i d i Jl s a i pore LTO j i tn a a a Emb e RE a NE See he B l If JU JU Bubble pot Groundwater I g j EPS50 34 bubble chamber o I Fig 3 Fastening the CBS on the top hat rail left demounting right 4 Installing OT
16. eter above sea level With the following formula the local gravi tational constant g in m s can be calculated g 9 780356 1 0 0052885 sin a 0 0000059 sin 2a 0 003086 h where a is the degrees of latitude and h the height above sea level in km Jursa A S Ed Handbook of Geophysics and the Space Environment 4th ed Air Force Geophysics Laboratory 1985 pp 14 17 Example Kempten OTT At a height above mean sea level of 669 m 0 669 km and a latitude of 47 71 a local gravitational constant of 9 80659 m s results Note The OTT CBS is preset to an average value for Germany Kassel The measurement deviation caused by gravitation is 3 mm in Germany Flensburg Oberstdorf This measurement error can be compensated by inputting the local gravitation al constant 23 24 Fig 21 Diagram to determine the maximum load resistance as a function of the power supply Minimum power supply 10 V Maximum power supply 30 V Resistor tolerance 0 1 15 ppm 10 Determining the maximum load resistance at the 4 20 mA interface The load resistance connected to the OTT CBS must not exceed a specific maxi mum value This value depends on the level of the supply voltage of the OTT CBS If the load resistance is greater the output current can no longer be evaluated Smaller load resistances are allowed Read off the maximum load resistance for your power supply from the following diagram Example Power supply 18
17. evel in ft pressure in mbar pressure in psi temperature in C status see Chapter 9 commands aM and av for further information In the relevant Channel function blocks adjust to the required units and number of digits after the decimal place m 3 cm 0 ft 2 mbar 1 psi 3 C 1 status 0 Note To record all seven values of an OTT CBS seven channels in the LogoSens 2 DuoSens are necessary The first channel contains the function block SDI 12 Mas ter or OTT SDI RS485 as the input signal The other channels each contain a func tion block Virtual Sensor V02 to VO7 as the input signal Naturally just individual channels can be recorded In this case there are fewer entries required in the Value no Virtual Terminal ID field Caution The measuring time is at least 1 minute 15 Fig 12 Connecting the OTT CBS to LogoSens 2 or DuoSens using a 4 20 mA interface Use the 100 Ohm OTT resistor order number 55 550 126 4 2 The letters above below the screw terminal strip identify the possible connections on the LogoSens 2 DuoSens CBS In the shown application the supply of the current loop will occur via the OTT CBS Fig 13 Setting operating parameters of the LogoSens 2 4 20 mA function block The DuoSens function block U I Pt1 00 is set in the same way 16 4 20 mA interface 6 5 Connecting the OTT CBS to LogoSens 2 or DuoSens using a Connect the OTT CBS to the LogoSens 2
18. harge ESD Resistance to electromagnetic fields Resistance to transient fields burst Resistance to surge Line borne and radiated interference 15 m or 0 1500 mbar 50 ft or O 25 psi 30 m or 0 3000 mbar 0 100 ft or O 50 psi 1 mm or 0 1 mbar 0 01 ft or 0 001 psi ooo 5 mm 0 02 ft measuring range 0 15 ft 0 01 ft measuring range 15 50 ft 0 065 of measured value or 0 02 ft whichever is less 0 1 FS TC 10 ppm C at 20 C 1 m min m or ft bar or PSI 4 20 mA SDI 12 SDI 12 via RS 485 10 30 V DC typ 12 24 V DC typ 320 mAh day max 3 700 mAh day typ 25 mAh day max 300 mAh day 165 mm x 205 mm x 115 mm setting operating parameters eight Call purge function display error status using LED Display operating state error status approx 1 500 g ABS IP 43 20 60 C 40 85 C 10 95 not condensing Connection possibilities for 2 mm 4 mm 1 8 2 mm 1 8 max 100 m 4 mm max 75 m complies with EN 61000 4 2 degree of severity 2 4 kV contact discharge complies with EN 61000 4 3 degree of severity 3 3 V m complies with EN 61000 4 4 degree of severity 5 4 kV complies with EN 61000 4 5 degree of severity 5 4 kV complies with EN 55022 Class B 30 1000 MHz cE 27 Document number 63 200 001 B E 04 0211 OTT Hydromet GmbH Ludwigstrasse 16 87437 Kempten Germany Phone 49 831 5617 0 Fax 49 831
19. he maximum load resistance at the 4 20 mA interface Carrying out maintenance work 11 1 Activating purge function 11 2 Cleaning bubble chamber 11 3 Testing measuring tube Status LED Note about the disposal of old devices Technical Data no ONN N 21 22 22 23 24 25 25 25 26 26 27 1 Scope of supply OTT CBS 1 Bubble Sensor OTT CBS with possibility for connecting measuring tubes with A mm 2 mm external internal diameter 1 Installation kit top hat rail with fastening parts screw terminal blocks pin jumpers 1 Operating Instructions 2 Order numbers OTT CBS Bubble Sensor OTT CBS 63 200 001 9 2 Accessories Measuring tube mm 2 mm external internal diameter transparent PE 50m 99 420 050 9 5 100m 99 420 100 9 5 Combined measuring tube bubble chamber suspension cable black with kevlar core for length stabilization measuring tube with 4 mm 2 mm external internal diameter transparent PE 50m 99 420 009 9 5 100m 99 420 008 9 5 Measuring tube 6 mm 4 mm with sheathing Length as requested 20 500 133 5 5 Measuring tube 6 mm 4 mm without sheathing Length as requested 20 500 302 5 5 Bubble chamber suspension cable black with Kevlar core for length stabilization 50m 99 000 050 9 5 100m 99 000 100 9 5 Bubble chamber for ground water for observation wells beginning at 2 diameter 670 gram 55 510 051 4 2 Bubble Pot EPS 50 for surface water hose connector 4
20. m DO a 2 lt CR gt lt LF gt overload measuring range exceeded DO a 4 lt CR gt lt LF gt power supply voltage too low DO a 8 lt CR gt lt LF gt pump motor overloaded DO a 16 lt CR gt lt LF gt watchdog error DO a 256 lt CR gt lt LF gt data memory defective DO a 512 lt CR gt lt LF gt data bus defective DO a 1024 lt CR gt lt LF gt analog converter defective DO a 2048 lt CR gt lt LF gt measuring cell defective more than one error sum of errors Note Messages 256 to 2048 signify hardware problems that can only be rectified by the OTT Repaircenter see chapter 11 In this case send your OTT CBS to us Message 16 means that your unit has been restarted No intervention is necessary The answers consist of the following a device address ttt 001 time in seconds until the sensor is ready again at the latest n 5 number of measured values More information on the SDI 12 standard commands can be found in the document SDI 12 A Serial Digital Interface Stan dard for Microprocessor Based Sensors Version 1 3 see Internet page www sdi 12 org 22 9 2 Advanced SDI 12 commands All advanced SDI 12 commands begin with an O for OTT With these commands it is possible to configure the OTT CBS through the transparent mode of a datalogger Command Response Description aOXP lt value gt aOXP lt value gt lt CR gt lt LF gt Activate purge function The parameter lt value gt represents the se
21. mm 2 mm 55 510 048 3 2 hose connector 6 mm 4 mm 55 510 049 3 2 Straight pipe fitting for connecting measuring tubes with 63 200 025 9 2 1 8 internal diameter and 3 8 external diameter Fig 1 Overview of OTT CBS 3 Introduction The OTT CBS working on the air bubble principle can be used for measuring ground water or water levels depending on the bubble chamber used To meet the various demands of the station three different versions of the OTT CBS bubble sensor are available Standard version Measuring range 0 15 m or 0 1500 mbar Resolution 1 mm or 0 1 mbar Accuracy 5 mm USGS specification version Measuring range 0 15mor 0 1500 mbar Resolution 1 mm or 0 1 mbar Accuracy measuring range O 15 ft 0 01 ft measuring range 15 50 ft 0 065 of measured value or 0 02 ft whichever is less 30 m measuring range version Measuring range 0 30 m or O 3000 mbar Resolution 1 mm or 0 1 mbar Accuracy 5 mm The compressed air produced by a piston pump flows via a measuring tube and the bubble chamber into the water to be measured The pressure created in the measuring tube is directly proportional to the water column above the bubble chamber The OTT CBS determines the barometric air and bubble pressure one after the other By taking the difference between the two signals the OTT CBS calculates the height of the water level above the bubble chamber The power supply can be provided from a mains adapt
22. n for the 4 20 mA interface can be achieved Example For 2 m water level change 16 mA measuring range is available DIP switches 5 6 OFF Fig 17 Scaling the measuring range of the OTT CBS CBS 4 20 mA interface idis Standard 30 m measuring USGS specification range 15m 50 f 30 m 100 ft 1 5 bar 25 psi 3 bar 50 psi not scaled not scaled 8 m 25 ft 15 m 50 ft 0 8 bar 12 psi 1 5 bar 25 psi 4m 12ft 8m 25ft 0 4 bar psi 0 8 bar 12 psi 2m 6ft 4m 12ft 0 2 bar 3 psi 1 5 bar 6 psi 8 4 Setting the measuring system for the 4 20 mA interface Fig 18 Setting the measuring system of the OTT CBS 4 20 mA interface 8 m mbar Imperial measurement system feet psi 8 5 Setting measurement type of the 4 20 mA interface to water level or pressure measurement Fig 19 Setting measurement type to water level or pressure measurement 4 20 mA interface ON ER 12345678 Water level measurement ON Ili 12345678 Pressure measurement 8 6 Factory setting of the operating parameters Fig 20 Factory setting of the operating parameters ON gg 190 g D 123 45 6 7 8
23. nt process set to Error code if range overflow if required record error codes if range overflow Auxiliary sensor supply via not required with an OTT CBS relay contact at terminal block only for LogoSens 2 Insert a function block 2 Point scaling into this channel and set the appropriate water levels for the electrical values measured e g for an OTT CBS with 15 m measuring range and level measurement DIP switches 5 6 ON Point 1 4 0 Point 2 20 15 Ensure you note here the settings of DIP switches 5 6 With depth measurement ensure that DIP switch 4 is set to ON or carry out the inversion of the value via function 2 point scaling e g for an OTT CBS with 15 m measuring range and depth measurement DIP switches 5 6 ON Point 1 4 15 Point 2 20 0 In the relevant Channel function block set the unit and number of digits after the decimal place m 3 ft 3 mbar 1 psi 3 Note on points 6 2 to 6 5 To reference OTT CBS level depth values to a level zero Input the contact gauge staff gauge measurement for example using the scaling function of the datalogger connected to the OTT CBS e g LogoSens DuoSens 17 Fig 14 Activating purge function manually 18 on the OTT CBS with membrane button 7 Activating the purge function On the front of the OTT CBS there is a Pump membrane button see Fig 14 Pressing the button activates the purge function for as long as it is
24. ol elements inside the housing In the case of device defects contact the OTT Repaircenter OTT Hydromet GmbH Repaircenter Ludwigstrasse 16 87437 Kempten Germany Phone 49 831 5617 433 Fax 49 831 5617 439 repair ott com 25 12 Status LED For the display of any error states that may occur the OTT CBS has a Status LED on the front of the device see Fig 1 The following error states can arise level too low lt 5 cm 1 x flash overload measuring range exceeded 2 x flash power supply voltage too low 3 x flash pump motor overloaded 4 x flash watchdog error 5 x flash data memory defective 6 x flash data bus defective 7 x flash analog converter defective 8 x flash measuring cell defective 9 x flash The OTT CBS shows an error state when it arises and for approximately 2 minutes after pressing the Pump membrane button The defective error states signify hardware problems that can only be rectified by the OTT Repaircenter see chapter 11 The watchdog error error state means that the OTT CBS has been restarted No intervention is necessary Any error states arising can be displayed as follows Press Pump membrane button briefly lt 1 second otherwise the purge function is called the LED lights once for a longer period as confirmation Pause Ist error state arising e g flashing once Pause 2nd error state arising e g flashing three times Pause The OTT CBS repeats all error st
25. rfaces SDI 12 4 20 mA current loop RS 485 2 wire SDI 12 protocol via a physical RS 485 interface as well as a connection for the power supply U GND The three interfaces make it possible to connect the OTT CBS both to OTT data loggers and to any datalogger by another manufacturer that has the correct inter faces The SDI 12 interface meets SDI 12 Standard 1 3 SDI 12 Serial Digital Interface with 1200 baud All electrical connections are made using two screw terminal strips supplied at terminal blocks A and B on the underside of the OTT CBS Screw terminal strip A B SDI 12 GND A GND B Q L4 N SDI 12 protocol via physical RS 485 interface for connecting to OTT LogoSens and OTT DuoSens 20 mA S 20 ma e RS 485 A RS 485 B SDI 12 DATA JJo _ 4 4 6 1 Connect power supply The OTT CBS requires a power supply of 10 30 V DC typ 12 24 V DC e g using batteries or mains connection with galvanically separated low safety voltage Please note the following points when dimensioning the power supply Maximum power consumption per day 3700 mAh typ 320 mAh day with 1 min measurement interval and 100 m measuring tube using the 4 20 mA interface Peak current consumption temporary max 2 A Protect the supply voltage with a microfuse e g 2 5 A slow blow When using
26. solar panels we recommend the use of an overvoltage protection device To supply the OTT CBS with power proceed as follows Connect the power supply to screw terminal strip A of the OTT CBS as shown in Fig 8 Notes The OTT CBS does not have a switch for switching the unit on and off As soon as power is supplied the OTT CBS is ready for operation Each time the power supply is attached the piston pump operates for approx 400 strokes approx 5 minutes running time 6 2 Connecting the OTT CBS to any datalogger using an SDI 12 interface Connect the OTT CBS to an SDI 12 input of the external datalogger Follow the datalogger handbook as you do this See Fig 8 for the assignments 6 3 Connecting the OTT CBS to any datalogger using 4 20 mA interface Connect the OTT CBS to a 4 20 mA input of the external datalogger Follow the datalogger handbook as you do this as well as Chapter 10 of these instruc tions See Fig 8 for the assignments With depth measurement ensure that DIP switch 4 is set to ON 13 Fig 9 Connecting the OTT CBS to LogoSens 2 or DuoSens using an SDI 12 interface The letters above below the screw terminal strip identify the possible connections on the LogoSens 2 DuoSens CBS Fig 10 Connecting the OTT CBS to LogoSens 2 or DuoSens using an RS 485 interface SDI 12 protocol The letters above below the screw terminal strip identify the possible connections on the LogoSens 2 DuoSens CBS
27. tting defined as follows 0 purge function deactivated 1 purge function activated aOXG lt value gt or aOXG a lt value gt lt CR gt lt LF gt Set query value for local gravitational constant Format cbb aaa c Polarity or bb Number before the decimal point aaa Number after the decimal point aOXT lt value gt or aOxT a lt value gt lt CR gt lt LF gt Set query value for local water temperature Format cbb aaa c Polarity or bb Number before the decimal point aaa Number after the decimal point Notes on commands aOXG lt value gt and aOxT lt value gt The probe either produces a value proportional to the pressure or an actual water level compensated for the relative density of the water The corrected water level measurement is calculated according to the following formula Water level mH O pressure at 4 C f 9 80665 Water density Local gravitational constant With water density 6 017777e t2 0 0000408 t 0 999841 and with t temperature in C The OTT CBS can calculate the water density at any time using the value for the local water temperature You can enter the value for the local gravitational constant using the command aoxG value Calculation of the correct value for the local gravitational constant The gravitational acceleration at the earth s surface varies between 9 78036 m s at the equator and 9 83208 m s at the poles Also it decreases by 0 003086 m s for each kilom
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