Micro Density Sensor IOM - Integrated Sensing Systems
Contents
1. Contents 6 PIB PE NANCE ociicomamautmasmdsenauuneaniaieatatnmaneieunicaneiaausmsuieieamas 17 6 1 Cleaning the sensor LUD ivsscececcsaths cessed canessanidekeddaecsineedusondodeatescaeenisnncanten 17 6 2 EXCGMOl cleaning nnani Een EE EAA TAE a aa 18 7 TROUBLESHOOTING crror riaa ected EER RE EER 19 7 1 Liquids containing DUD SS css caconsanccodseuxeeusonecereaeneidensrenearmeniariindaneundienennics 19 7 2 Fluid temperature changes and gradients cessscccecssessececeesseeeeeeeeesenaees 19 7 3 BIA DOS alicc csisiietdeaniiecbiniatetecuudetheanietbee miata EE ateniedebieenieis 19 8 TECHNICAL DA TA csn a bas Jo cadedasta E 20 8 1 Performance MTOM AU OM jidinen 2518 a sgaedincetentad cad anencduentiuiacenadvaaseeemusguduventeds 20 8 2 Material and mechanical Specifications ccsssccccesssssseceeesssseeeeeeessenaees 20 8 3 Legal disclaiMiEt s dccicsacicusnaadstoncdaacasemadessaaadotctaadeeadaoniwaxtadanshnnnactoeasaecass 21 8 4 Patents see cccdensdnastedsgvececceczdodsevcdedeaeducdevade costa ecdwanatela a a a a iee 21 8 5 Contact information s sssssssssssssesrrtseereettssrterrssrtttssrtettntttttentsesrennsssrennne 21 ii Integrated Sensing Systems Designated use 1 DESIGNATED USE 1 1 Micro Density Products Overview Integrated Sensing Systems Inc has created a line of micro density measurement products built around ISSYS core technology of fluidic sensors software and packaging These products are avai2. User Manual For Installation and Operation ISSYS PN 105916 Rev F January 2012 Integrated Sensing Systems Inc Micro Liquid Density Sensors SN 49200523 DigtaiNo Input 139 8 VOC ANOJ YES Mig date Mayv2012 Range 6 1 Sg cc INTEGRATED SENSING SYSTEMS Contents Contents COMO TIES asinna N R ENN O O N N Na i 1 DESIGNATED USE issssicrcssssiissssoricissssecissarrccnesstsonsstssinasrosinadnseioniis an nsan ii ianiai 1 1 1 Micro Density Products OVErvieW cccccsssssececcsssseeeeesesseeeceecssaueeecseesneeeens 1 1 2 MicroMCs Methanol Concentration SCNnsOr ccccccccccccsssesssstsssssssssssssesesess 1 1 3 MicroLDS Liquid Density SQMSOMcic ssieccsstieeesheddsanazccstsdeds ecacnddadnareesasidadecansacas 2 2 SAFETY CONSIDERATION iriran ane E E R RARR 2 2 1 Operational Safety COnsiderations cssscccccccsssseccecessseeeeecesseeeeeeessenaees 2 2 2 Installation Commissioning and Operation cc cccccsesesseceesssssteeesesssteeeeees 3 2 3 Returning Instrument to the FaCtOFy ccsscccccssssnececeessseeeceecssaaeeesesesteeeeees 4 2 4 Notes on Safety Conventions and Alert ICONS ccccsssssseceessesteeeeeesseeeeeens 4 3 PRODUCT IDENTIFICATION ssriscessnersnincnsorncessetessnsiansorinaidsanesnnaiedain aaiae 5 3 1 Product Descriptions stoui rizresssisins isani iesi arisa En EEEE NR Nias 5 3 2 Technology OVGIVie Ws siecesssadesiaddessatedsartiavenadinetuaidebiaaiatedeaidaphiaadodaici
3. e Check the packaging and the contents for damage e Check to ensure nothing is missing and that the scope of supply matches the order If additional transport is required e Always transport the instruments in the containers in which they are delivered e The covers fitted to the process connections prevent mechanical damage to the sealing faces and prevent ingress of foreign matter during transportation and storage Do not remove these caps until immediately before installation Storage e Pack the instrument to protect it against damage while in storage The original packaging will provide optimum protection e The permissible storage temperature range is 20 to 80 C 4 F to 176 F with the optimum being 20 C 68 F and moderate humidity e The instrument must be protected from direct sunlight during storage to avoid un acceptably high surface temperatures 4 INSTALLATION 4 1 General Configuration Information Every effort is made at the factory during calibration and testing to configure the device to the customer s requirements based on which model was purchased This includes density units the temperature units voltage output process variable selection and ranges For the microMCS the outputs are set for methanol concentration 0 10 wt and temperature 0 70 C The goal is for the microMCS to be ready to generate data as soon as it is plumbed and wired into the system For the microLDS the density i
4. any such unintended or unauthorized application Buyer shall indemnify and hold Integrated Sensing Systems harmless against all claims and damages Other products or brand names mentioned herein are trademarks or registered trademarks of their respective holder 8 4 Patents This device is protected by pending US and International patents and the following granted patents US Patents 6 477 901 6 923 625 7 059 176 7 228 735 7 351 603 7 381 628 7 568 399 7 581 429 7 628 082 and Jap Patent 4 568 763 8 5 ISSYS Contact Information Mailing and Shipping Address 391 Airport Industrial Drive Ypsilanti Michigan USA 48198 Phone Fax Phone 734 547 9896 FAX 734 547 9964 Websites www mems issys com www microcoriolis com User Manual For Installation and Operation 21
5. pressure spikes User Manual For Installation and Operation 9 Installation A Warning Be very careful concerning system pressure when using barbed fittings and elastomeric tubing to connect the density sensor The max pressure rating for these fittings is a function of the tube material and internal diameter of the tubing Overpressure may cause of failure of the connection resulting in a leak that could damage the instrument or the equipment around the instrument 4 7 Internal Bypass The micro density products are available with and without a 0 018 inch internal bypass orifice No Bypass Applications In this configuration all the fluid flows through the sensor This application is for measuring small amounts of fluid Bypass Applications A bypass is added to the sensor to allow a higher flow of fluid through the sensor at much lower pressure drop The following diagram shows how the density sensor is mounted on the bypass orifice The flow of fluid through the orifice creates differential pressure which drives a very small amount of fluid through the sensor Density Sensor Concentration Sensor Flow _ gt Integral Bypass Orlfice 0 018 ID The differential pressure generated by the orifice is the flowrate For higher flow through the density sensor increase the flowrate through the orifice The differential pressure generated is also a function of the density of the fluid A Note In bypass mode
6. the response time to detect a step change in density is dependent on the flowrate through the sensor Higher flows will result in a faster response time This must be considered when utilizing the sensor output for a control application 10 Integrated Sensing Systems Installation Water at room temperature Bypass 0 46mm sey Water at room temperature No bypass 3000 2500 2000 1500 pressure loss mbar pressure loss mbar 1000 500 flow rate kg h 4 8 Wiring The micro density sensors come standard with a 2 meter cable The diagram shows the color code for the wiring connections for the sensor Micro Density Sensor Wiring Wire Color Function V Power 5 12 VDC Do not exceed 13VDC V Power Common RS232 Transmit RS232 Recieve Signal Ground Common GND Signal Out Channel 1 0 5 to 4 5 volts 0 10wt MeOH in Water Signal Out Channel 2 0 5 to 4 5 volts 0 70C Case Ground optional 00000000 A Note It is recommended to use the lowest possible voltage to power the sensor User Manual For Installation and Operation 141 Operation 5 OPERATION 5 1 AnalogCommunication Analog outputs are standard The outputs are 0 5 to 4 5 volts The microMCS outputs are configured at the factory to 0 to 10wt methanol concentration and 5 70C temperature The microLDS analog outputs are scaled from 0 6 to 1 3 grams cc and temperature 5 70 C Use the optional ISSYS Fluidic Communicati
7. 40 is the fourth level down 14 Integrated Sensing Systems Operation RT Data Overview The RT Data Screen provides the ability to plot up to 4 measured values on the screen This is under the Graph function To select the values to measure select the variables by holdingthe control button and then clicking on the measured values to be graphed The second function of this screen is to log data on the internal hard drive of the computer User Manual For Installation and Operation 15 Operation ISSYS Fluidic Communication V 20 20 Dispte Comm Comm condition Pot XCONS S iv teri lll Patam RE Date intema date Adjust GRAPH realtime data select Value to plot Value FuelSense Ref Denuty Pressure STOP graphing LOG reaitime data select Value to log Value FuelSense Hold CTRL to select more than one output variables to graph or save esp matme ezanin gt 000030 000015 O02 O00025 ONN Dra Fer C Program Files s86 USSYS Fiuidic Meter Logged RT data Range Portion Comment Comment f Deader eath line Clear graph Overs dnploy SNNT delay sec Eo e paeme reer o ee ee eT gr 0a t 10 100 so The final screen is the Adjust screen This allows the user to adjust the meter calibration and reset factory values This screen should only accessed by a trained technician 16 Integrated Sensing Systems Maintenance 6 MAINTENANCE 6 1 Cleaning t
8. adaaaune 5 3 3 Available Product Featuresuncciciccsice ectastesatei tesscsterceeligertecaeceadaceusatagecigeananee 6 3 4 Instrument NANIG ANG Siig 42s cccssusduetadonsaudvaiense le rauadetviasaiutcgdadeuedieessadduusdiuede 6 3 5 Incoming Transport Additional Shipping and Storage cccccsssceeeeeseeeees 7 4 OI STi aT ceca Saccaatatecns daca cea tease oteas tata apes teens ce em ees ates 7 4 1 General Configuration Information ccccssssccccessssseececesssneeeecesssseeeceeesenaees 7 4 2 Physical Installat ORs ircre essenin srair E 8 4 3 Fl idic COMMOCT ONS s cesissinirisisi iaeia aadis oeiia iia 8 4 4 Fluid FiltratiON sseiineisinorissroosnnissinnosicnoideaii seni ieia inedia oii 9 4 5 Thermal WSU OM erescsosessise ketas rocissa kinita cactwalcebouuegutandeademuve Sueniietbea eecsesions 9 4 6 System Pressure and Pressure Spike ProtectiOn ccccccssssececeesssneeeeeeseaees 9 4 7 Internal BY B ASS sccsainlacasonctvezsSceuctaavncczceneichsasawehdtaswctscnedushuse Sermercetebcceeauesceteanene 10 4 8 WINE esios en E dead isl Pecteand veins TE E E O O 11 5 OPERA TON neinnar ne ERE AT A ERAR RN ERR 12 5 1 AnalOSCOMMUNMICAT OM criccavisecnccassisanwnedsesnnessecsdedsncdeveaianesdundeccepandeneldacsaddies 12 5 2 Digital Communication Optional cccsceccssseceesseeeeesseecssseeeesseeeeeseeeess 12 5 3 ISSYS Fluidic Communication Operating Interface Optional 600 13 User Manual For Installation and Operation i
9. ant temperature variations gt 4 C minute the instrument needs some time to settle to the new temperature During this transition the instrument s temperature compensation will lag and the density measurement will not be accurate during this transition period If the ambient temperature is very different from the fluid temperature it is recommended the sensor be insulated to avoid influences on the temperature measurement In that application extremes insulation or heat tracing might be required for the housing and the flow channel to have the same temperature 7 3 Disposal There are no toxic materials used in the Micro Liquid Density Sensor construction Observe the Country regulations for the disposal of any device containing printed circuit boards and electronic components User Manual For Installation and Operation 19 Techinal Data 8 TECHNICAL DATA 8 1 Performance information 8 2 Material and mechanical specifications Wettedmaterials e Silicon e Glass Pyrex 7740 Borosilicate e Stainlesssteel e High Performance Chemically Resistant Cross Linked Epoxy 15 32 20 Integrated Sensing Systems Techinal Data 8 3 Legal disclaimer ISSYS assumes no responsibility for infringement of patents or rights of others based on ISSYS applications assistance or product specification since ISSYS does not possess full access concerning the use or applications of customers products ISSYS also assumes
10. buttons 0009 externalsensor option value temperatureorpressure Ifthedensityisoutofrange lt 0 5g cc DensityRangewillbeoutputafterthetemperature valueanddensity Dtaginsteadofthedigitaldataasinthefollowingstring 000823 53 0005DensityRange Anyothercommandisnotsupportedandshould notbesent 5 3 ISSYS Fluidic Communication Operating Interface Optional The density meter to computer interface is controlled with a Lab view executable file For detailed instructions on using this software see the ISSYS Fluidic Communication Software manual Here is a basic description of the operation of the software Overview The Fluidic Communication software is set up as four screens to allow adjustment of the meter plotting data recovering internally recorded data and adjustments It is easy to understand how to navigate each screen The following is a review of each of the screensand a general description of how to navigate each screen Operation Parameter Screen Overview User Manual For Installation and Operation 13 Operation The Parameter screen is built as a tree structure It is the primary screen for making configuration changes to the FS GDM The functions that can be changed are labeled in thetree structure The following screen is an example of changing the units of the different measurements It is important to point out that the fourth level down in the tree is where the changes can be made Configuration 0
11. g to tighten the compression fitting NEVER use the body of the sensor as a counter force to tighten the compression fitting This can transmit torque into the sensor and cause a measurement shift Turbulence from valves elbows t connections etc do not affect the operation of the micro density sensor Caution Cavitation or high frequency water hammer can effect the operation of the sensor or possibly result in mechanical damage Available Fittings 1 8 compression left 1 16 barbed right 8 Integrated Sensing Systems Installation 4 4 Fluid Filtration Due to the small internal dimensions of the MEMS sensor install a filter in the incoming tubing to keep particles from contaminating the filter This is very important in applications that are potentially dirty Caution Particles can permanently plug the sensor The minimum recommend filtration is 50 microns The product warranty does not cover sensor plugging due to particles 4 5 Thermal Insulation If mounting the micro liquid density sensor on a thermally conductive surface that is contact with a heat source the use of a thermal insulation pad between the sensor bracket and or mounting surface is recommended to reduce thermal gradients during operation Note A thermal gradient across the sensor can lead to measurement errors 4 6 System Pressure and Pressure Spike Protection Avoid exceeding the published operating pressure specification of the
12. he sensor tube The first step in cleaning the flow tube is using a high flow rate of de ionized water to rinse the flow channel several times The flow direction of cleaning fluid should be opposite the normal flow direction through the sensor The next step is to use isopropyl alcohol rinse to remove the water The final step is to gently blow the flow channel with nitrogen or dry compressed air Verify that the flow channel is sufficiently clean fill with water and confirm that the density reading is correct If water and IPA does not clean the sensor the next step is to clean the sensor tube with a hydrocarbon such as hexane Call the factory for advice on alternative cleaning treatments User Manual For Installation and Operation 17 Maintenance Caution Do not use highly acidic or highly alkaline solutions to clean the flow channel as these solutions may damage the flow channel and affect the performance of the instrument 6 2 Exterior cleaning The micro density sensors are not sealed Do not apply any fluid to the outside of the sensor Use a dry cloth to clean the outside of the sensor 18 Integrated Sensing Systems Troubleshooting 7 TROUBLESHOOTING 7 1 Liquids containing bubbles Bubbles in the liquid can potentially get trapped in the sensor tube which will cause an error Make sure the liquids are bubble free 7 2 Fluid temperature changes and gradients If the process has rapid and signific
13. instrument Ensure that cavitation does not occur in the line feeding the instrument Cavitation will negatively influence the instrument s performance No special measures need to be taken for fluids that have a vapor pressure similar to water under normal conditions In the case of liquids with a high vapor pressure hydrocarbons solvents liquefied gases or mounting in suction lines it is important that the line pressure does not drop below the vapor pressure causing the liquid to flash It is important to ensure that dissolved gases that occur naturally in many liquids do not outgas Outgassing can be prevented when line pressure is sufficiently high The following installation locations are generally preferred Downstream from pumps no danger of vacuum At the lowest point in a vertical pipe Liquid pressure spikes exceeding 300 psi 20 bar can damage the instrument These spikes can occur due to water hammer which is a very rapid rise in pressure due to the sudden closure of a valve in the line downstream of the instrument Be very careful of installations where a valve is used to control the backpressure of the liquid line since these valves can open and close rapidly resulting in a rapid wave of high pressures A special pressure spike suppression device sometimes called a Pressure Snubber can be added to meter inlet to prevent this type of damage The use of flexible tubing to connect the instrument can also help to dampen these
14. just the operation of the meter Example Applications Embedded density in analytical applications Glycol in water measurements Binary liquid concentration measurements 2 SAFETY CONSIDERATION A Warning Incorrectly applying this instrument can result in property damage and or personal injury Before installing and operating this instrument read this User Manual 2 1 Operational Safety Considerations e The micro liquid density products are not designed for operation in hazardous environments Strict compliance with these installation and operation instructions is a requirement e The instrument s external surface temperature can increase due to the power consumption of internal electronic components and hot process fluids passing through the sensor Additonal precautions should be taken when high fluid temperatures exist to make sure the maximum operating temperature of the instrument is not exceeded e The manufacturer reserves the right to modify technical specifications and installation instructions without prior notice Please contact your local agent to confirm that you have the latest version of the micro Density User Manual or contact Integrated Sensing Systems Inc 2 Integrated Sensing Systems Safety Considerations 2 2 Installation Commissioning and Operation e Mechanical installation connection to the electricity supply and outside electronics and routine maintenance of the instrument must be carried o
15. lable in two versions which are focused on two completely different application markets This manual will cover both products 1 2 MicroMCs Methanol Concentration Sensor The microMCS has a very focused application target the direct methanol fuel cell DMFC The microMCS is the replacement for the previous ISSYS FC10 methanol concentration sensor It isan improvement over the FC10 with upgraded electronics and software The microMCS differs from the FC10 in that the unit uses the density of the methanol water mixture and mixture temperature in an internal equation that calculates wt methanol The standard measurement range is 0 10wt methanol in water Optional methanol ranges are available consult the factory if there is an interest Concentration and temperature outputs are communicated using the standard voltage outputs A digital RS2232 output is available as an option Example Applications Direct methanol fuel cells Measuring methanol concentration in windshield deicing solutions User Manual For Installation and Operation 1 Safety Considerations 1 3 MicroLDS Liquid Density Sensor The microLDS is a general purpose liquid density sensor that is targeted at embedded OEM applications where density is needed in a small package It has a density measurement range of 0 6 to 1 3 grams cc The microLDS is available with the RS232 connection and also a version of the ISSYS Fluidic Communication Software to allow the user to ad
16. no responsibility for customer product designs and the impact of the design on the device or other components in the products or samples being tested or monitored by the product and interactions between these items The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice Integrated Sensing Systems assumes no responsibility for errors and omissions and disclaims responsibility for any consequences resulting from the use of information included herein Additionally Integrated Sensing Systems assumes no responsibility for the functioning of undescribed features or parameters Integrated Sensing Systems reserved the right to make changes without further notice Integrated Sensing Systems makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does Integrated Sensing Systems assumes any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation consequential or incidental damages This product is not designed intended or authorized for use in applications intended to support or sustain life or for any other application in which the failure of the Integrated Sensing Systems product could create a situation where personal injury or death may occur Should Buyer purchase or use Integrated Sensing Systems products for
17. on Operating Interface to create custom ranges of density and temperature for the microLDS 5 2 Digital Communication Optional An RS232 digital communication interface is available as an option This can be used to communicate density and temperature to an external computer for control It is also required to use the ISSYS Fluidic Communication Operating Interface Software CommunicationProtocol The meter only supplies data in response to a request command The following command structure must be adhered to if the user does not wish to use the ISSYS Fluidic Meter read out software Communicationportsettings Baudrate 19 200Databits 8Stopbit 1 Parity noneFlowcontrol noneTerminationchar none Sendthefollowingsetof8bithexnumbers 0x01 0x00 0x00 0x00 0x08 0x02 0x03 Waitat least95ms The responsefromthe meterwill beastringof8bit ASClIIlcharacters Therewill alwaysbe twocharacters followedbyafourcharacter Dtag followedbythedataasanASCll representationofafloatingpointnumber Therewillalwaysbeafinal Thesetwo symbolsareusedtoframethelDanddataforeachvariableforparsing 12 Integrated Sensing Systems Operation A Typical Output String would be as follows 000823 53 00050 80342 00060 00000 00000 00090025 10 ThelDtagsforthevariablesare 0008 sensortemperature 0005 densityinselectedunits g cc 0006 referencedensity option ifapplicable 0000 flowswitchactuation 0 noflow 1 flowisaboveswitchsetting settableinsoftware orfrompush
18. or close coupled temperature measurement Fluid properties such as density are calculated based on a vibrational frequency shift Factory calibration determines the fundamental vibrational frequency using multiple fluids with known densities Size Comparison of MEMS Density Sensor eet y User Manual For Installation and Operation 5 Product Identification 3 3 Available Product Features e Methanol concentration standard on microMCs e Temperature measurement e Digital communication optional e Analog outputs two 0 5 4 5 volts e internal fluid bypass 0 018 for low pressure drop measurement e Fluidic communication software optional e Concentration measurements optional 3 4 Instrument Nameplates The serial number for the unit is on the front of the device along with basic configuration information SN 49200523 DigtalNO input 195 VOC Anag YES miy date MAIO Range 6 1 3yce 6 Integrated Sensing Systems Installation 3 5 Incoming Transport Additional Shipping and Storage Every micro liquid density sensor instrument is shipped with a CD ROM that contains the User Manual any other relevant documentation and the optional ISSYS Fluidic Communication Software if purchased Inspect the package and contents to ensure that no damage has occurred during shipping Contact the factory if damage has occurred or is suspected prior to installation On receipt inspect the following items
19. ortant if the substances are hazardous to health e g flammable toxic caustic and carcinogenic e Costs incurred for additional cleaning waste disposal and personal injury burns etc due to inadequate cleaning will be charged to the owner operator 2 4 Notes on Safety Conventions and Alert Icons The micro density sensors are designed to meet state of the art safety requirements have been tested and left the factory in a condition in which they are safe to operate These devices can however be a source of danger if used incorrectly or for other than the designated use Consequently always pay particular attention to the safety instructions indicated in these Operating Instructions by the following icons A Warning Warning indicates an action or procedure which if not performed correctly can result in injury or a safety hazard Company strictly with the instructions and proceed with care Caution Caution indicates an action or procedure which if not performed correctly can result inincorrect operation or destruction of the device Comply strictly with the instructions A Note Note indicates an action or procedure which if not performed correctly can have an indirect effect on operation or trigger an unexpected response on the part of the device 4 Integrated Sensing Systems Product Identification 3 PRODUCT IDENTIFICATION 3 1 Product Description The compact micro density sen
20. pt to open the case e Do not subject the instrument to mechanical shock such as dropping it as this may damage the instrument e Supplying the instrument with power outside of the specified range of voltage and frequency will damage the instrument e Process pressure spikes over 60 psi 4 bar and rapid pulsating pressures can damage the instrument e Freezing and solute crystallization can permanently damage the instrument e In certain applications adequate filtration of the incoming fluid is recommended to prevent clogging the sensor User Manual For Installation and Operation 3 Safety Considerations 2 3 Returning Instrument to the Factory The following procedures must be carried out before an instrument is returned for repair or calibration e Contact ISSYS for a Return Merchandise Authorization RMA number prior to sending the instrument back Download an RMA form from the ISSYS website complete the form and include a copy of the RMA form inside the shipping container Clearly print the RMA number on the outside of the shipping box e Enclose special handling instructions if necessary for example a Material Safety Data Sheet MSDS for the chemicals used in the instrument as per Regulation EC No 1907 2006 REACH e Do not return this instrument if traces of hazardous substances have not been removed Pay special attention to the grooves used in seals and crevices that could trap residues This is very imp
21. s set at grams cc and the temperature is C Additional measurement units are available The device can be custom configured to the customer s requirements at the factory for an additional charge or can be customized by the customer using the optional ISSYS Fluidic Communication Software User Manual For Installation and Operation 7 Installation 4 2 Physical Installation The micro density sensors are insensitive to mounting orientation and the direction of flow The instrument should be securely mounted to a solid support structure using the mounting holes at the edges of the case All effort should be taken to avoid introducing stress the case of the instrument when mounting the unit to a structure A Note Do not mount the sensor to a structure that can be stressed due to outside forces This stress can cause a shift in the density measurement The MEMS sensor oscillates at a very high frequency gt 20KHz It is not affected by any vibration of the tubing or vibration transmitted through the mechanical mount 4 3 Fluidic Connections Fluid connections are available using either plastic barbed fittings or 1 8 stainless steel compression fittings The plastic barbed fittings are sized for 1 16 ID flexible tubing When using stainless steel tubing take care not to mount the sensor in a system where torque on the steel tubing can be transmitted to the sensor A Note Always use the hex nut on the compression fittin
22. sors will continuously monitor the density or concentration of fluids in wide variety of applications The instrument measures liquid density between 0 6 to 1 3 g cc with three digit uncertainty of 0 001 g cc The fluid temperature range is from 5 to 70 C The Maximum operating pressure is 60 psig The compact micro density sensors uses a state of the art proprietary Micro Electro Mechanical System MEMS fluidic sensor This sensor measures fluid density based on the Coriolis principle The MEMSchip integrates mechanical elements sensor and electronics into a tiny package The micro density sensors have the advantages of high accuracy very small compact packaging and fast response time Installation and system integration is simple since the measuring cell and control electronics are housed in one package 3 2 Technology Overview The MEMS sensor created using micro fabrication technology is a chip level device that can sense fluidic properties The electronics used in the device are fabricated using integrated circuit IC process sequences Like wise the micromechanical components in the fluidic chip are fabricated using compatible micromachining processes that selectively etch away parts of the silicon wafer or add new structural layers to form the mechanical and electromechanical devices The result is a hollow electrically oscillated silicon structure through which the fluid flows Embedded in the chip is a 100 ohm platinum RTD f
23. ut by trained qualified technicians authorized to perform such work by the facility s owner operator The technician must have read and understood this Users Manual and follow the instructions for safe operation of the instrument e Assistance in clarifying the chemical resistance properties of the wetted materials exposed to process fluids including fluids used for cleaning the sensor is available from ISSYS Changes in fluid temperature chemical concentration or the degree of contamination in the process fluid can result in changes in the wetted material chemical resistance properties Liability for wetted material chemical compatibility in a specific application is the responsibility of the user The user is responsible for determining if the fluid wetted materials are compatible with the process fluid e f welding is being done on the metal tubing feeding the instrument the welding equipment must not be grounded using the instrument It is also important to not over heat the instrument from the heat generated when welding the tubing feeding the instrument The installer must ensure that the system is correctly wired in accordance with the wiring diagrams The transmitter must be grounded unless the power supply is galvanically isolated e g galvanically isolated power supply according to SELV separated or safely extra low voltage or PELV protected extra low voltage e The micro density sensors have no repairable components Do not attem
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