DE1798188B2 - CIRCUIT ARRANGEMENT FOR MEASURING THE FLOW SPEED AND THE FLOW QUANTITY OF FLOWING MEDIA - Google Patents
CIRCUIT ARRANGEMENT FOR MEASURING THE FLOW SPEED AND THE FLOW QUANTITY OF FLOWING MEDIAInfo
- Publication number
- DE1798188B2 DE1798188B2 DE19681798188 DE1798188A DE1798188B2 DE 1798188 B2 DE1798188 B2 DE 1798188B2 DE 19681798188 DE19681798188 DE 19681798188 DE 1798188 A DE1798188 A DE 1798188A DE 1798188 B2 DE1798188 B2 DE 1798188B2
- Authority
- DE
- Germany
- Prior art keywords
- flow
- resistor
- line
- thermistor
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/10—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables
- G01P5/12—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables using variation of resistance of a heated conductor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid Mechanics (AREA)
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
Description
und vierter einstellbarer Widerstand P, besteht. Mit seinem einen Ende ist der dritte Heißleiter/VTC3 im die Leitung 13 angeschlossen, sein weiteres Ende steht über eine Leitung 14 mit dem einen Ende des \ ierten einstellbaren Widerstandes/^ in Verbindung. Mit seinem andncn Ende ist dieser Widerstand P4 über eine Leitung 15 mit der Leitung 5 verbunden. Parallel '.um dritten Heißleiter NTCA ist der dritte einstellbare Widerstand P3, dessen eines Ende mit dem einen Ende des dritten Heißleiters NTC1 und dessen Abgriff mit dem anderen Ende des Heißleiters .'VTi'., verbunden ist.and fourth adjustable resistor P, is made. One end of the third thermistor / VTC 3 is connected to the line 13, its other end is connected via a line 14 to one end of the adjustable resistor / ^. At its other end, this resistor P 4 is connected to the line 5 via a line 15. Parallel to the third thermistor NTC A is the third adjustable resistor P 3 , one end of which is connected to one end of the third thermistor NTC 1 and the tap of which is connected to the other end of the thermistor.
Zwischen der Leitung 14 des einen Endes des WiderstandesP, und der Leitung 15 des anderen wird j'ine Spannung abgegriffen werden, die proportional ■Jer Strömungsgeschwindigkeit oder der Menge des an ilen Heißleitern NTC1, NTC, und NTC.t vorbeisin'nivnden Mediums ist. Diese Spannung ist in der ..m erwähnten Weise temperaturkompensierl.Between the line 14 of one end of the resistor P and the line 15 of the other, a voltage will be tapped which is proportional to the flow rate or the amount of NTC 1 , NTC, and NTC in the thermistors. t is passing the medium. This voltage is temperature compensated in the manner mentioned.
Sofern, wie bei dem gezeichneten Ausführungsheispiel dargestellt, der Widerstand P4 als einstellbarer Widerstand ausgebildet ist, so kann zwischen reinem Abgriff 24 und seinem mit der Leitung 15 verbundenen Ende die erwähnte kompensierte Spannung einstellbar abgegriffen werden. Der einzustellende Wert richtet sich nach den Eingangswerten der nachgeschalteten Meßgeräte.If, as shown in the illustrated exemplary embodiment, the resistor P 4 is designed as an adjustable resistor, the mentioned compensated voltage can be tapped adjustably between the pure tap 24 and its end connected to the line 15. The value to be set depends on the input values of the downstream measuring devices.
Die kompensierte Meßspannung wird gemäß der Zeichnung über Leitungen 16,17 vom Abgriff 24 bzw. der Leitung 15 einer Meßeinrichtung zugeführt.According to the drawing, the compensated measuring voltage is supplied via lines 16, 17 from tap 24 or the line 15 is supplied to a measuring device.
Es empfiehlt sich, die drei Heißleiter/VTC1, NTC, und NTC3 in einem Rohr auf engstem Raum aneinander anzuordnen. Durch dieses Rohr wird dann das zu messende Medium geleitet. Bei der Anordnung der Heißleiter ist darauf zu achten, daß der geheizte Heißleiter NTC1 so angeordnet wird, daß er die beiden restlichen Heißleiter thermisch möglichst gering beeinflußt. Auch ist darauf zu achten, daß die Strömung in diesem Rohr soweit als möglich laminar gehalten wird.It is advisable to arrange the three thermistors / VTC 1 , NTC, and NTC 3 in a tube in a very confined space. The medium to be measured is then passed through this pipe. When arranging the NTC thermistors, make sure that the heated NTC 1 thermistor is arranged in such a way that it has the least possible thermal influence on the two remaining NTC thermistors. Care must also be taken to ensure that the flow in this pipe is kept as laminar as possible.
ίο Selbstverständlich ist es auch möglich, insbesondere bei Rohren oder Hohlkörpern größeren Durehmessers mehrere der erläuterten Meßvorrichtungen anzuordnen. Auf diese Weise werden unterschiedliche Strömungsverteilungen in dem größeren Querschnitt erfaßt und zur Anzeige gebracht.ίο Of course it is also possible, in particular in the case of pipes or hollow bodies with a larger diameter, several of the measuring devices explained to arrange. In this way there are different flow distributions in the larger cross section detected and brought to the display.
Die angestrebte Temperaturkompensation über den gesamten Meßbereich de' erfindungsgemäßeii Meßanordnung wird dadurch en eicht, daß man mit dem einstellbaren Widerstand P1 die Temperatur-The desired temperature compensation over the entire measuring range of the measuring arrangement according to the invention is calibrated by using the adjustable resistor P 1 to set the temperature
ao abhängigkeit für eine Strömungsgeschwindigkeit O m/s auf O Volt pro Grau Ceslius abgleicht. Dann wird mit ücm zweiten einstellbaren Widerstand P., die Ausgangsspannung für die Strömungsgeschwindigkeit 0 m/s auf 0 Volt abgeglichen. Mit dem dritten Widerstand P;i wird die Tempsraturempfindiichkeit des dritten in der Strömung angeordneten Heißleiters NTCz so eingestellt, daß sie derTemperalurabhängigkeit der zwei in eine Brücke geschalteten Heißleiter entgegengerichtet ist und dadurch für jede beliebige Strömungsgeschwindigkeit innerhalb des Meßbereiches temperaturkompensiert.ao dependency for a flow velocity of 0 m / s to 0 volts per Grau Ceslius. The output voltage for the flow velocity 0 m / s is then adjusted to 0 volts with a second adjustable resistor P. With the third resistor P ; i , the temperature sensitivity of the third thermistor NTCz arranged in the flow is set in such a way that it opposes the temperature dependence of the two thermistors connected in a bridge and thereby compensates for temperature for any flow velocity within the measuring range.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681798188 DE1798188C3 (en) | 1968-09-06 | 1968-09-06 | Circuit arrangement for measuring the flow velocity and the flow rate of flowing media |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681798188 DE1798188C3 (en) | 1968-09-06 | 1968-09-06 | Circuit arrangement for measuring the flow velocity and the flow rate of flowing media |
Publications (3)
Publication Number | Publication Date |
---|---|
DE1798188A1 DE1798188A1 (en) | 1972-06-08 |
DE1798188B2 true DE1798188B2 (en) | 1973-06-07 |
DE1798188C3 DE1798188C3 (en) | 1974-01-03 |
Family
ID=5708814
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19681798188 Expired DE1798188C3 (en) | 1968-09-06 | 1968-09-06 | Circuit arrangement for measuring the flow velocity and the flow rate of flowing media |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1798188C3 (en) |
-
1968
- 1968-09-06 DE DE19681798188 patent/DE1798188C3/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1798188C3 (en) | 1974-01-03 |
DE1798188A1 (en) | 1972-06-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) | ||
E77 | Valid patent as to the heymanns-index 1977 | ||
EHJ | Ceased/non-payment of the annual fee |