HOME > 필드버스기술 > Fieldbus Products News   Low Cost of Thermal Mass Flow Meter MF260A HVAC for BAS & HVAC, MF260A ROTA for Rota Meter Replacement 관리자 2018.11.04 1129 [Feature & Application] *  Low Cost and Compact, Easy installation & Maintenance free *  Flow Monitoring & Control for BAS & HVAC System   *  Replacement with ROTA meter with Electronic Signal     *  High Accuracy ±1.0% FS *  Output:  4~20 mA, Modbus 485 RTU Digital Communication *  Response Time : 0.9 sec,  Repeatability : ±0.2% FS *  Local Display : 16x2 Backlit LCD, Instant Flow & Totalization *  Field Programming with parameter change by Built-In 4-Key *  Low Flow Cutoff Adjustment [General]     The model MF260A series is designed with full digitally featuring for the measurement of gases, air, compressed air which is based on constant  temperature differential technology for air and other process gases. The model MF260A is very suitable for BAS & HVAC as well as ROTA flow which gives simultaneously 4-20mA and Modbus 485 RTU digital communication signal. Because neither temperature nor pressure measurement are required. MF260A series reduces installation cost and vastly improves system accuracy. The meter is easily installed or retrofitted with minimum down time and provides superior long term process reproducibility and easy serviceability. MF260A inline type ROTA flow meters are available in probe sizes from 1/4” to 1” with NPTF fitting connection, and insertion type flow meter HVAC is available in probe sizes from 20” up to 150”  with  flange connection. The MF260A provides a 4-20 mA output signal, and  Modbus 485 as a digital communication.   MF260A series flow meter utilizes a constant temperature differential (dT) technology. The sensor has two RTD elements. One is the velocity sensor and the other one is gas temperature sensor. The electronics heats the velocity sensor above the gas temperature as constant differential temperature. It is the job of the electronics to maintain a constant ΔT between the gas temperature and the heated element. As the mass flow increases, the increased number of gas molecules remove more heat from the heated element. The electronics senses this temperature reduction and adds additional power in order to maintain a constant ΔT. The amount of power delivered to the heated element, therefore, is just proportional to the mass flow rate. [Performance Specs] *  Accuracy                                                         ±1.0% Full Scale                                                  Straignt Pipe Run 10 x ID (U/S), 5 x ID (D/S) *  Repetability                               ....     ±0.2% Full Scale                                           *  Response ime                                                                                                           0.9 sec ( 63% one time constant of final value )                   *  Gases                                                             Air, Argon, Nitrogen, Oxygen, Methane, Propane, Butan,Carbon Dioxide, Butane,       Natural Gas, Digester Gas,   Hydrogen, Ammonia, Mixed Gas,Others                         [Operating Specs]                                                                     *  Measuring Flow Units                                                  Nm3/hr, Nm3/min, Kg/day, Kg/hr, Kg/min, Kg/sec ,SCFM, SCFH, Lb/day, Lb/hr,      Lb/min, Lb/sec , NLPH, NLPM, SLPM, SMPS, NMPS, SFPM                                                                               *  Measuring Flow Velocity                                                   0 ~ 50  NMPS (standard)-based on air @0℃ 1 atm                   0 ~ 100 NMPS (option)-based on air @0℃ 1 atm ===================================================================================== To determine if insertion flow meter will operate, properly divide the maximum flow rate by the duct area. Here are the flow rates for common pipe sizes.               Duct(square)...............Nm3/hr..............SCFM ------------------------------------------------------------------------------------- *  20     .inch...........0 ~    45000..........0 ~  28600 *  40      inch...........0 ~   185000..........0 ~  77800 *  60      inch...........0 ~   418000..........0 ~ 266200 *  80      inch...........0 ~   743000..........0 ~ 473000 * 100     inch............0 ~ 1161000..........0 ~ 739400 * 120     inch............0 ~ 1673000..........0 ~1065600 * 150     inch............0 ~ 2612000..........0 ~1663600 note : reference gas  Air     Standard condition Nm3/hr: 0℃ 1 atm , SCFM : 70°F 1 atm ===================================================================================== To determine if inline flow meter will operate, properly divide the max flow rate by the pipe area. Refer to the flow table below Pipe(sch40).............Nm3/hr............... SCFM ------------------------------------------------------------------------------------- * 1/4 .  inch..............0 ~ 13................0 ~    8 * 1/2    inch..............0 ~  37...............0 ~   24 * 3/4    inch..............0 ~  65...............0 ~   42 * 1       inch..............0 ~ 105...............0 ~   67 * 1-1/2 inch..............0 ~ 240...............0 ~ 152 * 2       inch..............0 ~ 394...............0 ~ 250 * 2-1/2 inch..............0 ~ 614...............0 ~ 390 note : reference gas  Air     Standard condition Nm3/hr: 0℃ 1 atm , SCFM : 70°F 1 atm ===================================================================================== *   Temperature           Standard Sensor : -40 ~ 80 °C       High Temp Sensor : 0 ~ 120 °C       Enclosure: -40 ~70°C without display                          0 ~ 60°C with display                                     *  Power Supply                                                              Standard  : 24 VDC 0.2 Amp                Built-in Surge Protection      DC reverse polarity Protection *  Output        4-20 mA DC, Modbus 485 RTU [ Physical Specs]       *  Sensor Material         Standard : 316 Stainless Steel       Option : Hastelloy-C 276           *   Enclosure         Weather-proof,  NEMA 4X, IP66       Non-hazardous area installation   [Dimensional Specs] *   Probe Diameter  : 1/2-inch ( 12.7 mm ) *   Process Connection : 1” Plastic Flange or                                     on request (insertion type) ///////////////////////////////////////////////////////////////////////////////////// 00-CATALOG-MF_SERIES-EN-2008.pdf

12, 166 Bun-Gil, Gahyun-Ro, Tongjin-Eup, Gimpo-City, Gyeonggi-Do 10030 ,korea Mostek Co.,   Ltd Registered No : 217-59-00187 Phone : +82-31-982-3909    Fax : +82-31-982-6909 email : info@mostek.co.kr    URL : www.mostek.co.kr Copyrightⓒ 2000 Mostek Co., Ltd. All rights reserved