2600 Turbidity Manual v2.4 - Environmental Systems & Services
Contents
1. Public sdidata 4 sdidata 1 Turbidity sdidata 2 not used sdidata 3 not used sdidata 4 temperature of SDI12 interface up PENA AAN VAN AAN AAA PROGRAM 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1111 111 BeginProg Scan 20 Sec 3 0 Scan every 20s sw12 1 Open LPD flap Delay 0 7 2 Delay 7 seconds SDIl2Recorder sdidata 1 0 M 1 000 0 Take reading SW12 0 Close LPD flap NextScan EndProg 11 2600 26005 Turbidity Sensor User Manual V2 4 environmental systems amp services While running the above program can be examined using the Loggernet display as shown below Every 20 seconds the LPD flap will open for 7 seconds The SDI 12 readings will then be Updated and the flap will close The cycle will then repeat 9 CR1000 Numeric Display 2 Real Time Monitoring Connected Add Delete Delete All Options HEEL sdidata 1 Turbidity reading This will change with turbidity sdidata 2 not used sdidata 3 not used sdidata 4 SDI interface temperature CR1000 Logger 12V thick red n thick black High current source e g battery Figure 11 2600S connections for example program 12 2600 2600S Turbidity Sensor User Manual V2 4 environmental systems amp services 2600S SDI 12 commands Typical Response 2 Returns address of a single sensor on the ONAR SDI 12 bus Oo Ping returns same address O r n Verify command Sub2. 9 SDEL2 2600 O EMO cette 10 Example 2600 SDE TZ OOO Mit AA ANA ac 11 Figure 11 26005 connections for example program eeeeeeeeeeee 12 268005 IDA Z COMMONS ae 13 METE US Set o e o e lo et 14 Ho A TETA ATADA ATO 14 Lens inspection and Maintenance eeeennnnnnnsssessennennnnnnnnnnnennnnennnnnnnn 14 LPD sponge INSPECTION and Maintenance 14 Ha jes AAA 14 SIE IC IE ON os 15 Se EALE E a EE o eG eae eee es 17 Accion ee 17 Mindata s Quality Assurance Statement ISO9001 accreditation ES amp S is currently an AS NZS ISO9001 2008 certified organisation This certification is evidence that sound practices are used to get high quality instrumentation to your organization within a reasonable time interval Standard practices are used for all areas of manufacture beginning with the efficient procurement of incoming orders right through to shipment Stringent quality assurance procedures are applied to all aspects of manufacturing including the calibration of scientific instruments against NATA traceable references Every sensor is accompanied by a test and calibration certificate that can be used as reference information as well as evidence of sensor accuracy Terms of Warranty The warranty period for any new instrumentation shipped from ES amp S is 12 months from the shioment date This warranty ensures the instrumentation will operate and continue to operate for a period of one year from the purchase dat
3. Conductor colour type Conductor designation switched 12vdc input SDI 12 SDI 12 V1 3 red thick 12vdc input LPD black thick ground for LPD SDI 12 2600 Operation To obtain a measurement from the 26005 SDI 12 sensor Install the sensor according to recommendations in Section Installation Apply continuous 12 vdc to the LPD supply wires Figure 9 Apply switched 12vac to the sensor wires figure 9 Read the SDI 12 Remove the switched 12vdc to close the LPD cover and turn off the sensor See the next section for an example program showing the reading of the 2600S with a CR1000 logger The SDI 12 data will be available for measurement after 1 second You may read the sensor continuously for up to 30 seconds before it must be switched off and wait for 15 minutes Prolonged measurement will otherwise cause sensor self heating and consequently inaccurate measurements You must wait for 6 seconds to allow the LPD time to recharge before taking another measurement Once a reading has been taken removing switched 12vdc will cause the LPD cover to close and protect the sensor lens from fouling until the next reading is required Typically if a reading is required every 15 minutes the lens exposure will only be less than 0 2 of the total installation time With proper care and routine maintenance the sensor can be left operating unattended for up to 3 months assuming 1 second reading time Of course
4. and integrated lens protection device It is constructed from durable machined plastic components titanium metal and epoxy resins A neoprene sponge is used to protect the lens from contamination that can be easily replaced if it is found to have deteriorated The sensor is of round construction as shown above An 8mm diameter submersible rated cable is hardwired to the back of the sensor length specified during ordering Although care must be taken to secure the sensor at all times the sensor may be susoended from the cable Once installed the sensor will measure turbidity from zero fo full scale as indicated on the sensor body in Nepheleometric Turbidity Units NTU During factory calibration the sensor output is adjusted so that 4 mA out represents zero NTU and 20 mA represents full scale The dry end of the cable has a splice fitted that allows connection of a separate 12v dc supply for powering the LPD circuitry The other side of the splice has three wires for supply ground and current output signal A connector can be fitted for direct connection to ES amp S equipment such as the 3500 logger or custom connectors can be fitted upon request Once a 12 volt supply has been fitted to the LPD power terminals and switched 12 volts is applied the LPD cover will open automatically before the turbidity sensor will measure suspended solids and output a corresponding 4 20mA signal Removing power from the switched 12 volt supply will caus
5. sensor designed to measure water and liquid levels reliably and accurately Dipmeter The Water Level Indicators Dipmeters are typically used to measure the depth of water levels in boreholes standpipes or observation wells environmental systems amp services 8 River Street Richmond Victoria 3121 AUSTRALIA T 61 3 8420 8999 F 61 3 8420 8900 environmental esands com www esands com
6. 00 turbidity sensor work The 2600 turbidity sensor uses an optical backscatter technique to measure turbidity in liquids An infra red light source S transmits a cone of light into the liquid Suspended solids in front of the sensor will reflect some of the light back towards the sensor detectors D As turbidity increases the amount of reflected light also increases and hence a proportional measurement can be made by comparing the light intensity transmitted with that received The sensor is calibrated to measure a range of turbid solutions and after signal processing converted into an output signal which can be read and processed by a data logger There are two types of 2600 a 4 20MA output version and an SDI 12 version 26005 1 2600 26005 Turbidity Sensor User Manual V2 4 Figure 1 2600 Sensor measurement principle The above diagram shows how the sensor works IR light coming from the source S is shone into the liquid Some of this light will be reflected at close to 180 and received by the detectors D The received light is shown in red Some of the light is scattered at different angles and lost while some ot it is reflected several times What is the Lens Protection Device Lens fouling is an issue that plagues all optical measurement devices that are exposed to harsh environmental conditions Typically an electronic turbidity sensor is required to operate in remote locations and visited after long periods D
7. VERSION 2 4 2600 26005 TURBIDITY SENSORS 2600 4 20mA INTERFACE 26005 SDI 12 INTERFACE environmental systems amp services 8 River Street Richmond VIC 3121 Australia T 61 3 8420 8999 F 61 3 8420 8900 environmental esands com Table of Contents DOCK OUP OMIM OA HO Narda iaa aaa aaa 1 A ALS A CMV RRPNERUERETOFRERRFEERTEENENUFEEERFEUEILIEREIURHUERTEEREUHETEREERREERRUAEHEIERRERREREHEEERETE l HOW IS TUrDIOHY MEASG ura os l How does the Mindata 2600 turbidity sensor WOrk ussssnssseeeeeeeennnnnnn l Figure 1 2600 Sensor measurement principle 2 What is the Lens Protection Device ccccccccccccncnnnnnnninananoconanacanacoccccnnnnnonoss 2 Sensor des ClO MOM aa DA een endete 3 Figure 2 2600 AIMEBNSIONS aueh 3 os A er 4 MENO CU O A ada ee naeh 4 Sensor CUCM OM seen 5 FIgure 3 SENnsoronenNntA NO Naiara 5 Sensor Els ANS tt acti 5 Figure 4 Sensor ClO ONGINC een 5 SIP PAO ee 6 Figure Sensor installation IUD 6 a 6 2600 14 20MA VEION aa 7 Sensor electrical connection 4 20MA Version eessen 7 Figure 7 Electrical equivalent Cl ius 7 Figure 8 Cable conductor designation oocccroccininnnannnanananananss 7 4 20MA 2600 OPEerAtiON ooo 8 2008 DEIZ VEION rennen 9 Sensor electrical connection SDI 12 Version ooocccccccnnnnnnninccccnncnnnnnonanines 9 Figure 9 Standard 4 20mA version top and SDI 12 version DOMO a ea 9 Figure 10 SDI 12 2600S Cable conductor designation
8. aled to maximum range 2600 Analogue 4 20MA current 26005 SDI 12 4 20 Example for 2000 NTU probe 1800 1600 1400 1200 1000 800 turbidity NTU 600 400 200 45 7 8 9 10 11 12 13 14 15 16 17 18 19 20 4 20mA or SDI 12 value In general the transfer function is Turbidity Tm R 4 16 NTU where Tm Max range R reading So for Tm 2000NTU Turbidity 125 R 4 NTU 15 2600 2600S Turbidity Sensor User Manual V2 4 4 20mA Resolution Power Supply Surge Protection Dimensions Weight environmental systems amp services infinite 10 15 V unregulated current capability gt 500MA 0 3MAh per reading on average typical Secondary surge protection Can absorb 0 6J of energy 262mm long 56 mm diameter Sensor only 0 73 kg with 10m cable 1 45 kg 16 2600 2600S Turbidity Sensor User Manual V2 4 environmental systems amp services Ordering information Item description code Turbidity sensor with integral LPD 2600 Cable hardwired to sensor with V splice meters 2610 Connector 3 pin male plug fitted to 2601 cable with V splice for battery connection 2612 Connector 3 pin male plug fitted to 2601 cable 2613 Extension cable with 5 pin male plug and 5 pin female jack meters 2614 Lens Protection Device replacement cover pads set of 5 2620 Battery 7ZAN SLA 12 volts 3302 Contac
9. as each application will be different it is recommended that the total time between services is determined experimentally 10 2600 26005 Turbidity Sensor User Manual V2 4 essS environmental systems amp services Example 2600 SDI 12 program The example below shows a sample program which can be used with the Campbell Scientific Cr 000 logger Wire up the 2600S as shown below and use the following CR1000 program Refer fo CR1000 manual for program loading and running instructions The Updating of the SDI 12 values can be seen using the diagnostic display Program name Cr1000 2600 display demo CR1 Date written 2 11 2009 using the CRBasic programming tool from Campbell Scientific LoggerNet 3 4 1 This program is used to test the 2600 Turbidity sensor using a Campbells CR1000 logger Sensor powered from 12V terminal and a G terminal and with SDI 12 on Cl erminal Logger connections C1 blue Sensor SDI 12 input output 12V yellow Sensor on Flap enable output to 26005 G white Sensor Ground Thick Red Flap 12V 2A flap current Thick Black Flap GND Use one of the Data Displays from the loggerNet Connect Screen to display the results Set the table cells to be labelled sdidata 1 to sdidata 4 The information from each of the four channels of the SDI 12 2600 will be displayed and updated every 20 seconds TVVVANANANANAAVANANANANANAN DECLARATIONS
10. e according to specifications and expectations The warranty covers part or complete replacement repair or substitution of new Instrumentation that has failed in part or completely within the warranty period While every effort has been made to supply robust and user friendly instrumentation the warranty does not cover instruments Incorrectly installed misused or operated in conditions outside those specified The warranty does not cover shioment costs for instrumentation installation or removal and under no circumstances whatsoever indirect or consequential losses caused by the failed instrumentation ES amp S believes the warranty conditions to be fair and just and in accordance with standard business practices worldwide ES amp S reserves the right to arbitrate any warranty issues and will ensure that warranty issues are treated with the highest standards of professional conduct At ES amp S we believe your investment in our products and services is a good decision and we will therefore ensure all your requirements are met at all times both now and in the future environmental systems amp services Background information What is turbidity Turbidity is the lack of clarity of a liquid It is the degree of cloudiness that prevents objects to be defined at a particular distance under the liquid surface and it is very similar to the way fog mist or pollution affects visibility in air For example consider standing at the ed
11. e the LPD cover to close over the top of the sensor lens and switch off the sensor During the next seconds the LPD circuitry will recharge with power from the separate 12 volt dc supply until the current draw Is very close to zero 3 2600 2600S Turbidity Sensor User Manual V2 4 environmental systems amp services Installation Site Selection Before installing a 2600 turbidity sensor it is recommended a suitable site is selected first The installation and maintenance complexity as well as the reliability of the instrument in critical applications depenas on the site chosen Well chosen sites slow flowing water no stratification minimal or no accumulation of debris around sensor easy and safe access away from waterway traffic sensor lens is always submerged in at least 200mm of water sensor lens is at least 400mm from bottom down looking or 200 mm from bottom across looking sensor cannot be dislodged during high flows Avoid sites with very high water flows where debris can accumulate around sensor excessive air bubbles in water difficult or unsafe access high siltation rates where sensor will be exposed in air during low flows Typically most sites that are already equipped with hydrographic instrumentation can be used for installation of the turbidity sensor 4 2600 2600S Turbidity Sensor User Manual V2 4 environmental systems amp services Sensor installation The 2600 sens
12. fter switched power is applied Once a reading has been taken removing switched 12vdc will cause the LPD cover to close and protect the sensor lens from fouling until the next reading is required Typically if a reading is required every 15 minutes the lens exposure will only be less than 0 2 of the total installation time With proper care and routine maintenance the sensor can be left operating unattended for up to 3 months assuming 1 second reading time Of course as each application will be different it is recommended that the total time between services is determined experimentally 8 2600 26005 Turbidity Sensor User Manual V2 4 environmental systems amp services 2600S SDI 12 version Sensor electrical connection SDI 12 Version The SDI 12 version of the 2600 2600S operates in a similar manner to the 4 20mA version The difference is the addition of an SDI 12 interface inside the body of the sensor as shown below 12V 4 20mA GND STD 2600 LPD 12V LPD Common 12V Yellow SDI 12 Blue GND White SDI 12 STD 2600 INTERFACE LPD Common Figure 9 Standard 4 20mA version top and SDI 12 version bottom switched 12Vdc yellow SDI 12 blue common ground white LPD 12Vdc thick red LPD common thick black Figure 10 SDI 12 2600S Cable conductor designation 9 2600 2600S Turbidity Sensor User Manual V2 4 environmental systems amp services
13. ge of a pier looking straight down into the water of a lake If the water is clear you will be able to see the bottom and objects lying on it quite sharply However during periods of high inflows from rivers feeding the lake a substantial amount of eroded soil will enter the lake and make the water cloudy enough so that objects on the bottom cannot be defined or the bottom will disappear completely This is turbid water How is turbidity measured The simplest way to measure turbidity is to visually determine the liquid clarity using a special Measuring cylinder with a white cross at the bottom When the tube is filled with turbid water the cross will eventually disappear or it will become impossible to define At this point the turbidity can be roughly determined using the calibrated graduations on the side of the tube This method to measure water visibility is still commonly used by environmental scientists and educational organisations It has low accuracy but is quick and simple and will give a good indication of turbidity Turbidity can be measured electronically using opto electronic devices Infra red light is reflected off susoended solids and the reflected light is received by sensors located close to the source By comparing the source and received light intensity an electronic sensor is able to determine the turbidity concentration and output the measurement as a calibrated electrical signal How does the Mindata 26
14. nto the inside area of the LPD cover Release the cover and ensure the soonge completely covers the lens Calibration check The sensor output can be checked against a reference instrument if it is available Ideally the measurement should be taken in the same solution as the sensor while the sensor is installed If there is a large difference an installation problem may be highlighted All sensor measurements should be within the soecified accuracy Please note that the 2600 sensor accuracy Is 3 of full scale For example if the sensor has a range of O to 1 000 NTU any readings over the whole range will be within 30 NTU If discrepancies are found also ensure a calibration check is made on the instrument that reads the sensor output If the sensor is not installed and It is possible to use reference solutions ensure there is at least the recommended clearance around the sensor head 14 2600 2600S Turbidity Sensor User Manual V2 4 environmental systems amp services Specifications Range Accuracy Temperature range Zero amp Full Scale Setting Response Time Type Output 2000 Standard choice of O to 100 250 500 1000 and 2000 NTU Other ranges are available Linearity lt 3 of full scale Temperature lt 0 05 C of FS over the range 0 to 30 C storage 10 to 60 C operating O to 30 C 0 1 of full scale setting 2 seconds to full accuracy 180 optical backscatter 880nm Sc
15. or can either be installed horizontally vertically or at an angle Please see the diagrams below for correct orientation The flow of water should be side on to the lens cover v v x x f Figure 3 Sensor orientation Dk The correct orientation of the sensor reduces the build up of silt and debris around the head area Where algae is a problem it is recommended the sensor is mounted vertically down looking or covered with a light shield keeping the sensor in the shade When installing a shield ensure the shield does interfere with the light path It should ideally be placed no less than 200mm from the sensor Sensor clearance Because the turbidity sensor measures light reflected off suspended particles in liquids care must be taken to ensure there are no other particles or structures that would cause incorrect measurement The sensor IR emitter will emit a cone of light into the liquid The diagram below shows the recommended limits or clearance required for the sensor to measure correctly If obstructions are present hn the measurement area the sensor accuracy will be affected Figure 4 Sensor clearance 5 2600 2600S Turbidity Sensor User Manual V2 4 environmental systems amp services Site preparation Before the sensor can be installed the site must be prepared to ensure The sensor will be secured protected and serviceable The following recommendation is based on typical installation methods prac
16. rcuitry ext 12 volts do Figure 7 Electrical equivalent circuit A single cable is hardwired to the 2600 sensor The diagram below shows the configuration and typical connection of the sensor to power and controlling equipment Figure 8 Cable conductor designation switched 12Vdc 4 20mA output common ground LPD 12Vdc LPD common 2600 2600S Turbidity Sensor User Manual V2 4 environmental systems amp services colour type designation 3 pin plug 5 pin plug a e rae Input A ee IO or SDI 12 6000 load White sensorcommon__ groundforsensor CC gt 2A A black ers PT forLPD 3 3 E 4 20mA 2600 Operation To obtain a 4 20mA measurement from the sensor Install the sensor according to recommendations in Section Installation Apply continuous 12 vdc to the LPD supply wires Figure 8 Apply switched 12vac to the sensor wires figure 8 Read the 4 20mA current output Remove the switched 12vac to close the LPD cover and turn off the sensor A current output signal will be available for measurement after second You may read the sensor continuously for up to 30 seconds before it must be switched off and wait for 15 minutes Prolonged measurement will otherwise cause sensor self heating and consequently inaccurate measurements You must wait for 6 seconds to allow the LPD time to recharge before taking another measurement The 4 20mA current output will be available for reading 1 second a
17. sequent ODO command will return the version of the 00001 r n Interface Begin a measurement Subsequent ODO om command will return the 3 measurements O0034 r n and the temperature qa lee a measurement and respond with F oma CRC on a a A ODO command END Begin a concurrent measurement Same as OM command but no service request 00034 r n is issued Begin a e measurement and OCC respond with CRC on subsequent ODO 00034 r n command Get data is called after a OM OMC OCI OCC and OV commands If called after the OV command then the single result is Response to OV 0 2 0 r n Otherwise 0 1 1 2 2 3 3 25 0 r n the version number otherwise it returns 4 results namely the 3 sensor voltages and the internal temperature of the interface OXSET Set and store one of the calibration VAR m p coefficients indexed by m p where m is OXACK r nN VAL the measurement and n is the parameter Retrieve and store the calibration coefficients indexed by m p where m is the measurement and n is the parameter to a string buffer ready to be retrieved by the OXGET command Retrieve the string buffer that was filled i If no error OXOK r n Possible errors OXLOAD erty OXACK r n OXER Retrieve a string for the last error OXER BAD COMMAND r N OXER BAD MEASUREMENT INDEX r nN OXER BAD COEF INDEX An generated by the use of an X command 13 2600 26005 Turbidity Sen
18. sor User Manual V2 4 environmental systems amp services Maintenance The 2600 sensor will require little periodic maintenance to ensure that measurements remain accurate It is recommended the sensor is checked during every visit or at least every 3 months You may find the sensor will not require any maintenance for even longer periods General Ensure the sensor and LPD operation is not affected by debris This may involve removing the sensor from its installation for a thorough inspection Ensure the installation is sound and the sensor is still secure from moving and there are no obvious signs of erosion or damage Lens inspection and maintenance remove the sensor from its installation and manually open the LPD cover check the lens for pitting scoring and contamination if required clean the lens with a cloth and water with a little detergent added until all debris has been removed The lens should be smooth and polished If the lens is pitted or scored check the sensor calibration and determine the source of mechanical damage fo the lens If the calibration has been affected and the lens is damaged by abrasion the sensor will need to be returned to ES amp S for service LPD sponge inspection and maintenance check the LPD cover sponge for deterioration Replace of necessary To replace remove the old sponge and allow the cover to dry The sponges have an adhesive backing on one side Remove the backing and place It i
19. t Details Environmental Systems 8 Services Pty Ltd Adaress 8 River Street Richmond Victoria 3121 Australia Phone 03 8420 8999 Fax 03 8420 8900 Int l phone 61 3 8420 8999 Intl fax 61 3 8420 8900 emall environmental esands com web www esands com Please contact us for sales or technical support BY DATE DESCRIPTION AUTHOR 29 10 2001 2 11 2009 Add SDI 12 reformatting 8 06 2010 Modified sample program re formatting 17 2600 26005 Turbidity Sensor User Manual V2 4 essS DELIVERING WATER MONITORING SOLUTIONS 1500 Electrical Conductivity Sensor The ES amp S 1500 Sensor is designed for measuring electrical conductivity of liquids at remote locations It is suited to low power water quality applications where access is limited Little maintenance ensures years of accurate data collection without recalibration and deterioration of metals The 1500 is NOW AVAILABLE with SDI 12 LevelPro 6100 The LevelPro 6100 advanced liquid level sensor is used to measure water level determination 0 70 metres Applications include river irrigation water level tidal monitoring groundwater level amp landfill monitoring dam tank reservoir levels waste water monitoring food warning systems process industry liquid level PumpPro 6150 The PumpPro 6150 combines an integrated air compressor module and levelpro 6100 advanced liquid level sensor to form a fully self contained hydrostatic pressure
20. ticed by today s hydrographers Several variations of this method are used to suit particular applications Please study the diagram below Site preparation involves the installation of a larger plastic tube along the waterway bank as shown The tube should ideally be continuous but may also be made from sections One end of the tube must be installed into the water ensuring the sensor optical path will not be obstructed according to the previous section Sensor Clearance The other end can be terminated in a junction pit that is large enough so that the sensor can be inserted from the pit Typically an underground electrical pit is used as this also allows a sensor carrier assembly to be inserted easily The pit must be installed on a stable part of the bank that cannot erode Site shelter Figure 5 Sensor installation Junction pit Sensor tube with sensor installed at end See detail waterway bank Detail A Guide tube Sensor is N gt strapped to side of tube Cable tie or similar devices Figure 6 Sensor installation tube 6 2600 26005 Turbidity Sensor User Manual V2 4 environmental systems amp services 2600 4 20mA version Sensor electrical connection 4 20mA Version The diagram below shows the electrical circuit equivalent of the 2600 turbidity sensor Switched e 12 volts de u circuitry mA out load resistance sensor common O RL EXT COMIMOI O LPD O ci
21. uring this time the lens may become contaminated with silt algae and other substance that will reduce the light source output and detector sensitivity Source light will also reflect off the contamination material As a result a contaminated lens will cause erroneous measurements ES amp S have developed a unique method of ensuring the lens remains free of contamination for long periods Rather than cleaning the lens regularly the Lens Protection Device LPD will keep the lens clean in the first place The LPD is a cover that protects the lens by covering it with a soft rubber sponge during idle periods When a reading is required the sensor is powered using switched 12 volts and the LPD will uncover the sensor lens After second the sensor output will be ready for reading by a controller such as a data logger When the controller has taken a reading the power is removed from the sensor and the LPD will once again protect the lens from contamination In a typical hydrographic system where a reading is required at 15 minute intervals for example the lens is exposed to water for only 8 seconds every hour just over 0 2 duty cycle 2 2600 26005 Turbidity Sensor User Manual V2 4 environmental systems amp services Sensor description Figure 2 Sensor dimensions mm 20 mm 262 mm Figure 2 2600 dimensions The 2600 turbidity sensor is a fully self contained optical backscatter sensor with processing and output module
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