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  1. Chromservis
  2. Measurement and control
  3. Gas measurement
  4. Flowmeters

Model XFM Aluminium Digital Mass Flowmeter

Reference: XFM17A-VAN6-A92

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Product description

Product description

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<FONT size=3><FONT face=Calibri>####Prin­ciple of operation<o:p></o:p­></FONT></FON­T>

<FONT face=Calibri>The stream of gas entering the Mass Flow transducer is split by shunting a small portion of the flow through a capillary stainless steel sensor tube. The remainder of the gas flows through the primary flow conduit. The geometry of the primary conduit and the sensor tube are designed to ensure laminar flow in each branch. According to principles of fluid dynamics, the flow rates<o:p></o:­p></FONT>

<FONT face=Calibri>of a gas in the two laminar flow conduits are proportional to one another. Therefore, the flow rates measured in the sensor tube are directly proportional to the total flow through the transducer. In order to sense the flow in the sensor tube, heat flux is introduced at two sections of the sensor tube by means of precision-wound heater sensor coils. Heat is transferred through the thin wall of<o:p></o:p>­</FONT>

<FONT face=Calibri>the sensor tube to the gas flowing inside. As gas flow takes place, heat is carried by the gas stream from the upstream coil to the downstream coil windings. <o:p></o:p></FONT>

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<FONT face=Calibri>The resultant temperature dependent resistance differential is detected by the electronic control circuit. The measured temperature gradient at the sensor windings is linearly proportional to the instantaneous rate of flow taking place. An output signal is generated that is a function of the amount of heat carried by the gases to indicate mass molecular based flow rates.<o:p></o:p>­</FONT>

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Parameters

Parameters

Brand: XFM
Category: Measurement and control / Gas measurement / Flowmeters
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<FONT face=Calibri>###De­sign features<o:p></o:­p></FONT>

<FONT face=Calibri>-</FONT> <FONT face=Calibri>Sup­ports up to 23 Engineering Units<o:p></o:p>­</FONT>

<FONT face=Calibri>-</FONT> <FONT face=Calibri>Stores calibration data for up to 10 gases<o:p></o:­p></FONT>

<FONT face=Calibri>-</FONT> <FONT face=Calibri>High and low gas flow alarm limits with preser delay interval<o:p></o:­p></FONT>

<FONT face=Calibri>-</FONT> <FONT face=Calibri>Two sets of user-programmable electromechanical SPDT relays<o:p></o:p­></FONT>

<FONT face=Calibri>-</FONT> <FONT face=Calibri>In­ternal conversion factors for up to 32 gases<o:p></o:­p></FONT>

<FONT face=Calibri>-</FONT> <FONT face=Calibri>Di­gital interface<o:p></o:p­></FONT>

<FONT face=Calibri>-</FONT> <FONT face=Calibri>Au­tomatic zero offset adjustment<o:p></o:p>­</FONT>

<FONT face=Calibri>-</FONT> <FONT face=Calibri>Self-Diagnostic tests<o:p></o:p­></FONT>

<FONT face=Calibri>###Techn­ical specification­s<o:p></o:p></FON­T>

<FONT face=Calibri>|Flow Accuracy|±1% of FS at calibration temperature and pressure.<o:p></o:p>­</FONT>

<FONT face=Calibri>|Re­peability|±0.25% of full scale.<o:p></o:p>­</FONT>

<FONT face=Calibri>|Flow Temperature Coefficient|0.15% of full scale/ FC or better.<o:p></o:p>­</FONT>

<FONT face=Calibri>|Flow Pressure Coefficient|0.01% of full scale/psi (6.895 kPa) or better.<o:p></o:p>­</FONT>

<FONT face=Calibri>|Ma­ximum Gas Pressure|3447 kPa (500 psig­)<o:p></o:p></FON­T>

<FONT face=Calibri>|Gas and ambient temperature| 0°C to 50°C (0°C to 50°C), dry gases only<o:p></o:p­></FONT>

<FONT face=Calibri>|Re­lative gas humidity|70%<o:p><­/o:p></FONT>

<FONT face=Calibri>|Leak integrity|max. 1 × 10-9 smL/sec He<o:p></o:p>­</FONT>

<FONT face=Calibri>|Con­nections| 1/4" compression fittings, other types optional</FON­T><o:p></o:p>

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Use

MediumVzduch
Max. flowrate10l/min

Material

Fitting materialBrass

Operating conditions

DisplayBez displeje
Analogue output0-5 V DC
Digital outputProfibus
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