Thermal Mass Flow Meter (Series MST)

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1 Overview MaxiFlo TM MST series Thermal Mass Flow Meter is the instrument of choice for reliable and accurate measurement of mass flows for various gases. It measures the mass flow of gas based on constant temperature differential technology and is able to measure gas flow in the range between 0 and 160 NMPS. 100% Customer Satisfaction Because neither temperature nor pressure measurement is required, MST series reduces installation cost and vastly improves system accuracy. The meter is easily installed or retrofitted with minimum downtime and provides superior, long-term process productivity and easy serviceability. MST series can have either inline sensor or insertion sensor. The inline sensor size ranges from 1 (25mm) to 12 (300mm) with either NPT thread connection or flange connection. The insertion sensors are available from 1 (25 mm) and above with the sensor mounting option of either compression fitting or flange. The indicator/transmitter provides a 4-20mA, pulse, RS- 485, HART, alarm, etc. Main Features Thermal Mass Flow Meter (Series MST) THERMAL MASS FLOWMETER Can measure gas/air flow without pressure or temperature compensation It can measure mass flow and also volume flow. No moving parts High accuracy of 1.0% of reading/1.5% FS ±0.5 Reading Wide turndown ratio of 100:1 Field-programming capability available SUS 316 stainless steel material for sensor body and sensing elements Lightening protection Measuring Principle MST series Thermal Mass Flow Meter utilizes both constant temperature differential (dt) and constant current technologies. The sensor has two elements. The reference RTD measures the gas temperature. The electronics heats the heated element above the gas temperature. It is the job of the electronics to maintain a constant current ( & 300) or a constant dt between the gas temperature and the heated element (). The electronics measures the dt and the current to measure the flow rate. 1

2 INDICATORS AND SENSORS MST Series Indicator/Transmitter Models Model Description Graphic LCD Indicator with Totalizer Principle: Constant Current Method Graphic Backlight LCD Indicator with Totalizer Principle: Constant Temperature Method Graphic LCD Indicator with Totalizer with Inline Sensor 1 ~12 (25~300mm) Principle: Constant Current Method Only for Air and Nitrogen Gases The indicator/transmitter can be mounted integrated with the sensor or mounted separately by option. Sensors Division Description Connection Pipe Size /Fitting Inline NPT Thread Flange 1 ~ 12 (25 ~ 300mm) with Insertion Sensor 2 ~ 40 (50~1000mm) Insertion Compression Fitting 1 ~ 40 Flange Fitting (25 ~ 1000mm) For insertion type sensors, mounting accessories (such as compression fitting and flange fitting are supplied upon request. with Insertion Sensor 2 ~ 40 (50~1000mm) with Insertion Sensor 1 ~ 12 (25~300mm) 2

3 Technical Specifications SPECIFICATIONS Technolog y & Feature Flow Velocity Range Constant Current Method Constant Temperature Method 0.6 ~ 60 Nm/s (Optionally up to 160 Nm/s) Constant Current Method Special Edition Only for Air and Nitrogen Gases Indicator /Converte r Flow Rate, Temperature, Density, Frequency & Totalizer Graphic LCD Flow Rate & Totalizer 16 x 2 Alphanumeric LCD with Backlight Flow Rate, Totalizer, Velocity & Temperature Graphic LCD Key 3-keys 4-keys 3-keys Output 4-20mA, Frequency, RS- 485 (MODBUS), HART 4-20mA, Pulse, RS-485 & Alarm 4-20mA, Frequency, RS-485 (MODBUS), HART Flow Rate Units Material Max. Pressure Max. Temperat ure Enclosure Power Supply Fixed at the Factory Indicator: -40~ 150 Weather proof (NEMA 4x), IP-65, Ex-proof (Exd IIC T3) Nm3/h, Nm3/m, Kg/d, Kg/hr, Kg/m, Kg/s, SCFM, SCFH, Lb/d, Lb/h, Lb/m, Lb/s, NLPH, NLPM, SLPM, SMPS, NMPS, SFPM Indicator Housing Cast Aluminum, Sensor SUS barg Sensor: Standard: -40 ~ 121, High-Temperature: 0 ~ 204 Weather proof (NEMA 4x), IP- 65 Fixed at the Factory Indicator: -40~ 150 Weather proof (NEMA 4x), IP-65 24VDC/220VAC 24VDC/220VAC 24VDC Accuracy ±1.5% FS ±0.5 Reading ±1.0% of Reading ±1.5% FS ±0.5 Reading Repeatabi lity ±0.5%, Reading ±0.2%, Full Scale ±0.5%, Reading 3

4 DIMENSIONS /300 Compression Fitting Flange Fitting 4

5 DIMENSIONS In-Line Type Flange Connection Screw Connection Remote Configuration Insertion Type Compression Fitting Smart Electronics Cable Gland by Customer Junction Box, Ex-proof Shielded Cable, 5 cond. 18 GA, 100 Ft, max. Compression Fitting, ¾ NPT Remote Configuration 5

6 Model Selection Guide Model Designator MST###-###-#-##-##/Options Constant-Current Method Thermal Mass Flow Meter Constant-Temperature Method Thermal Mass Flow Meter Constant-Current Method Thermal Mass Flow Meter for N2 Gas and Air Code Pipe Size in mm (Describe the dimensions in case of duct) ### Indicator/Converter Sensor Integral Remote Threaded (NPT Male) Inline Type Flanged (ANSI 150#) Insertion Type Compression Fitting (1/2 or 3/4" NPT) Flanged Fitting I R FT FF IC IF Power Supply Options 220VAC 24VDC HART instead of RS-485 Pressure Input (Built-in, for only) Flow Meter Cleaning for Oxygen P1 P2 HT PI CL We are here for you For further information, visit us at Seil Enterprise Co. Seoul Korea MAXIFLO TM is a registered trademark of Seil Enterprise Co. 6