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MAS

MAS K05/0722

page 9

8.2 Output signals

The output signal is obtained from the 9-pin “D” connector. A 0 to 5 VDC output
signal linearly proportional to gas mass flow rate is standard. A 4-20 mA current
loop signal is optionally available.

8.3 Display

KOBOLD Mass Flow Meters, model MAS, for gases are available with an
integrated digital display, a remote digital display and without a digital display.
The decimal point on the version with digital display is set at the factory. It is
always a 3 ½-digit display.

Attention! KOBOLD Messring accepts no liability for any damage,
claims or faults resulting from operation with oxygen. MAS devices
can be manufactured oil and grease free if desired.

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Содержание MAS

Страница 1: ...Operating Instructions for Electronic Mass Flow Meter Model MAS ...

Страница 2: ...1 Power supply 8 8 2 Output signals 9 8 3 Display 9 9 Operation 10 10 Totalizer 12 11 Maintenance 13 12 Technical Information 14 13 Conversion to other Working Conditions 15 14 Order Codes 19 15 Dimensions 20 16 Disposal 21 17 Supplement 21 18 EU Declaration of Conformance 25 Sold by Kobold Messring GmbH Nordring 22 24 D 65719 Hofheim Tel 49 0 6192 2990 Fax 49 0 6192 23398 E Mail info de kobold co...

Страница 3: ... by post in paper form against an applicable postage fee The devices are only to be used maintained and serviced by persons familiar with these operating instructions and in accordance with local regulations applying to Health Safety and prevention of accidents When used in machines the measuring unit should be used only when the machines fulfil the EC machine guidelines as per PED 2014 68 EU In a...

Страница 4: ... The operation of the meter is based on the calorimetric principle The measuring accuracy is 1 5 of full scale including linearity over 15 to 25 C and 0 3 to 4 bar absolute Its response time is 800 ms The typical response time is 6 seconds to display 98 of the full scale value This can be realised in between 25 to 100 of the full scale value Compared to most of the volume flow meters there is no t...

Страница 5: ...ween P1 and P2 which is generated by the laminar flow bypass element a part flow m1 is separated from the main flow m and guided through the sensor tube Two resistance temperature detectors RTD elements transferring a constant amount of heat to the gas stream are mounted on the measuring tube Under flow conditions the gas molecules absorb and transport the heat away from one to the other coil The ...

Страница 6: ...will crack the fittings and shift calibration The preferred mounting position is horizontal A vertical installation is possible but this must be considered during factory calibration since one has to count on a zero point movement depending on the operating pressure Swagelok and NPT screw connections must not be removed from the casing nor should their position be altered since they form a unit wi...

Страница 7: ...asuring device Attention A wrong terminal assignment may lead to a damage of the electronic If a power supply is connected do not supply with any additional voltage on the 9 pin Sub D connector When the MAS is configured for a remote display the display is supplied via the 9 pin D connector Attention Please note that opening the device cancels the guarantee We therefore recommend that you let such...

Страница 8: ...use a KOBOLD MAS 5000 or MAS 5015 power pack insert the jack plug in the foreseen socket on the Mass Flow Meter MAS Then simply connect the power unit to the mains If not using a MAS 5000 or MAS 5015 power pack supply the MAS via the 9 Pin Sub D Connector with a voltage of 12 15 VDC MAS Flow Meters require a single 12 to 15 VDC power supply capable of providing a minimum current of 100 mA The MAS ...

Страница 9: ... Display KOBOLD Mass Flow Meters model MAS for gases are available with an integrated digital display a remote digital display and without a digital display The decimal point on the version with digital display is set at the factory It is always a 3 digit display Attention KOBOLD Messring accepts no liability for any damage claims or faults resulting from operation with oxygen MAS devices can be m...

Страница 10: ...splay and or output by going to a high level above the full scale range After the overrange condition has been removed it may take several seconds for the MAS to recover and resume normal operation This will not harm the instrument Zero and Span Adjustments The zero and span potentiometers are accessed through marked ports on the right side of your MAS The analogue output is factory set and should...

Страница 11: ...al 4 20 mA output signal As an option for all MAS Mass Flow Meters a 4 20 mA analogue output is available The output signal is provided at 9 Pin Sub D Connector Attention Maximum load 50 to 500 Ohms Single unit Multiple Installation ...

Страница 12: ...999 The decimal point will automatically shift position as the total increases Upon reaching the maximum count 99999999 the totalizer will roll over be cleared and counting starts from zero again The totalizer is cleared by going to screen 2 or 3 and then press the button for more then 5 seconds The clearing of the totalizer can be observed on the screen The total count is stored in non volatile m...

Страница 13: ... and MAS 4xxx Cleaning is accomplished by simply rodding out the sensor with the Sensor Cleaning Stylette available from Kobold Messring for this purpose A 0 020 inch to 0 028 inch diameter piano wire may also be used During maintenance and cleaning please observe the following steps 1 Remove the unit from the system 2 Remove the two socket head access port plugs with a 6mm inch allen wrench 3 Vis...

Страница 14: ...e coefficient 0 15 f s C Pressure coefficient 0 3 f s bar Reproducibility 0 5 f s Response time within 25 100 of measuring range 6 s until 98 of actual flow rate is indicated reaction time 800 ms Max medium and ambient temperature 50 C Max working pressure nylon 10 bar stainless steel 35 bar Installation position any see factory calibration Gas density 1 x 10 4 cm s He nylon 1 x 10 7 cm s He stain...

Страница 15: ...ced to the new standard or actual conditions SCCM or SLM S means standard ACCM or ALM A means actual P Absolute pressure kg cm2 or psia and T Absolute temperature K or R K C 273 R F 460 Example 1 changing standard conditions If your MAS has a flow rate reading of 10 00 SLM and was calibrated at standard conditions of 70 F 21 C and 1 atmosphere 14 7 psia and if you wish to convert this reading to s...

Страница 16: ...ric flow rate of the gas referenced to standard conditions of 0 C and 760 mm Hg SCCM or SLM K The K factor defined in equation 6 1 Refers to the actual gas 2 Refers to the reference gas The K factor is derived from the first law of thermodynamics applied to the sensor tube N T mCp H 2 where H The constant amount of heat applied to the sensor tube m The mass flow rate of the gas gm min CP The speci...

Страница 17: ...y combining equations 1 and 5 2 2 2 1 1 1 2 1 2 1 p p xC N xC N K K Q Q ρ ρ 6 Please note that the constant b cancels out Equation 6 is the fundamental relationship used in the accompanying tables For convenience the tables give relative K factors which are the ratios K1 K2 instead of the K factors themselves In the third column of the tables the relative K factor is Kactual Kreferences where the ...

Страница 18: ...C output is 2 2 2 2 N CO N CO K K Q Q 000 1 74 0 2 co Q min 740 1000 3 Ncm Calculating gas mixtures Equation 6 is used for gas mixtures but we must calculate Cp N ρ for the mixture The equivalent values of r CP and N for a gas mixture are given as follows The equivalent gas density is 2 2 1 1 ρ ρ ρ T T m m m m where mT m1 m2 total mass flow rate gm min 1 Refers to gas 1 and 2 Refers to gas 2 The e...

Страница 19: ...20 Nml min 6 mbar L MAS 3002 MAS 3102 MAS 4002 0 50 Nml min 6 mbar L MAS 3003 MAS 3103 MAS 4003 0 100 Nml min 6 mbar L MAS 3004 MAS 3104 MAS 4004 0 200 Nml min 6 mbar L MAS 3005 MAS 3105 MAS 4005 0 500 Nml min 6 mbar L MAS 3006 MAS 3106 MAS 4006 0 1 Nl min 6 mbar L MAS 3007 MAS 3107 MAS 4007 0 2 Nl min 6 mbar L MAS 3008 MAS 3108 MAS 4008 0 5 Nl min 6 mbar L MAS 3009 MAS 3109 MAS 4009 0 10 Nl min 1...

Страница 20: ...MAS page 20 MAS K05 0722 15 Dimensions ...

Страница 21: ...ental regulations Batteries Batteries containing pollutants are marked with a sign consisting of a crossed out garbage can and the chemical symbol Cd Hg Li or Pb of the heavy metal that is decisive for the classification as containing pollutants Cd1 Hg2 Pb3 Li4 1 Cd stands for cadmium 2 Hg stands for mercury 3 Pb stands for lead 4 Li stands for lithium Electrical and electronic equipment 17 Supple...

Страница 22: ...MAS page 22 MAS K05 0722 ...

Страница 23: ...MAS MAS K05 0722 page 23 ...

Страница 24: ...MAS page 24 MAS K05 0722 ...

Страница 25: ...model MAS to which this declaration relates is in conformity with the standards noted below EN 61326 1 2013 Electrical equipment for measurement control and laboratory use EMC requirements Part 1 General requirements Also the following EC guidelines are fulfilled 2014 30 EU EMC Directive 2011 65 EU RoHS category 9 Hofheim 22 March 2021 H Peters M Wenzel General Manager Proxy Holder ...

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