IST -Flow Sens FS5L FS5LA Thermal Mass Flow Sensor for all-purpose use in Liquids
Contents
1. Flow Sens FS5L FS5LA FLOW Thermal Mass Flow Sensor for DET all purpose use in Liquids TEMPERATURE ao HUMIDITY Product The Flow Sens owns for water and water mixtures optimized design consists of two temperature depending platinum resistors both deposited on one chip The low ohm resistor with a small area is used as a heater whereas the other high ohm resistor serves to measure the reference temperature Using a bridge circuit the differing resistance value of two elements leads to different self heating The self heating is dependent upon the applied voltage the mass flow and the media in which the sensor is located Higher voltage increases self heating a higher flow rate increases cooling If the self heating is kept constantly by a suitable controller the voltage increases with higher flow rates and therefore becomes a measure for the mass flow As a result of his little thermal mass this sensor has fast heating and cooling response times The measuring principle of the sensor can be used for large operation ranges The Flow Sens is also available with a plastic housing of 6mm This option provides the user with ideal opportunities to incorporate the element into custom built applications or specific housings e g into a T piece Advantages Easy adaptable for different applications or into housings Simple signal processing and calibration No moving parts Excellent reproducibility Excellent long term s2. cal 4 10 V bridge supply voltage at AT 10 K 0 lt Vstram lt 10m s Max heater voltage Om s 6V Substrate material AI20O3 ceramic Response time t63 Temperature range Electrical connection Heater Other media and higher requirements upon request No responsibility accepted In general Construction size aie S 0 15 mm 100 mm 7 mm D 6mm 3 Y mm i 118 mm GND Rs Ru O6mm INNOVATIVE SENSOR TECHNOLOGY IST AG Industriestrasse 2 CH 9630 Wattwil Switzerland Phone 41 71 987 73 73 Fax 41 71 987 73 77 e mail info ist ag com www ist ag com All mechanical dimensions are valid at 25 C ambient temperature if not differently indicated m All data except the mechanical dimensions only have information purposes and are not to be understood as assured characteristics ms Technical changes without previous announcement as well as mistakes reserve m The information on this data sheet was examined carefully and will be accepted as correct No liability in case of mistakes mLoad with extreme values during a longer period can affect the reliability FLOW TEMPERATURE HUMIDITY O O O 2 b xe Cc Oo O aS O fa xe Cc 14 WY i O Q pom Qa BS ao E O u gt T O i WY xe as aS Cc f O E lt lt Q O x lt Oo
3. ia ze lt E 2 xe eS C Ke O 4 o a Q E Q E 14 O o LO N 14 Ke T gt pe fa WY i C E Ke Y 2 a0 pa O lt as assured characteristics ms Technical changes without previous announcement as well as mistakes reserve m The information on this data sheet was examined carefully and will be accepted as correct No liability in case of mistakes mLoad with extreme values during a longer period can affect the reliability Flow Sens FS5L FS5SLA Thermal Mass Flow Sensor for all purpose use in Liquids Electronic circuit recommendation CTA Constant temperature anemometer The two elements heaters RH and sensor Rs can be interconnected in accordance with following schematic in a bridge Resistances R1 R2 and R3 are to be dimensioned correctly according sample circuit to be seen below The bridge is balanced if the temperature difference AT amounts the desired value between Rs and RH of e g 10 K With changing flow rate the bridge supply voltage U_Bs changes The values for Rland R3 depend on the temperature difference AT and the medium which can be measured They are delivered the customer For air or other gases can be taken this from following circuit suggestion R2 should be able to be adjusted for the purpose of the calibration about 10 The alignment procedure depends on app
4. lication Both circuit and the curve plotting are examples In the concrete case of application always an individual calibration is necessary MPSAO5 Bridgevoltage U_Bs V 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 Flow velocity ms Rs Heater Pt1200 Typical signal curve between 0 0 8 m s Flow Sensoren FS1L oder FS5L Option The electric connection can be provided customer specific If a connector is requested we provide e g the JST connector EHR 3 with 3 pins polarized and with a latch locking system INNOVATIVE SENSOR TECHNOLOGY IST AG Industriestrasse 2 CH 9630 Wattwil Switzerland Phone 41 71 987 73 73 Fax 41 71 987 73 77 e mail info ist ag com www ist ag com All rights reserved The material contained herein may not be reproduced adapted merged translated stored or used without the prior written consent of the copyright owner Typing errors and mistakes reserved Product specifications are subject to change without notice V2 0 04 2005
5. tability Best price performance ratio Applications HVAC and building control solutions Automotive industry Medical devices Device monitoring Cooling devices Food industry g INNOVATIVE SENSOR TECHNOLOGY IST AG Industriestrasse 2 CH 9630 Wattwil Switzerland Phone 41 71 987 73 73 Fax 41 71 987 73 77 e mail info ist ag com www ist ag com All mechanical dimensions are valid at 25 C ambient temperature if not differently indicated m All data except the mechanical dimensions only have information purposes and are not to be understood as assured characteristics m Technical changes without previous announcement as well as mistakes reserve m The information on this data sheet was examined carefully and will be accepted as correct No liability in case of mistakes mLoad with extreme values during a longer period can affect the reliability Flow Sens FS5L FS5LA FLOW Thermal Mass Flow Sensor for DET all purpose use in Liquids TEMPERATURE aU HUMIDITY Technical Data Measuring principle Measuring range Response sensitivity Accuracy Warm up time thermal 0 10 m s 0 01m s lt 3 current measuring value dependent on electronic and calibration lt 1 min depending on mounting lt 100 ms 30 100 C 150 C 3 pins NiPt Leads 0 2mm insulated with PTFE tube Ry 0 C 45 Q 1 Referenz element R 0 C 1200 Q 1 Required Voltages typi
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IST Flow Sens FS5L FS5LA Thermal Mass Flow Sensor for all purpose use in Liquids