DS1511 TTELEC | Alldatasheet

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Features

 Automatic  No power required  Adjustable over wide range  High accuracy  Fast response  Gases or liquids  Suitable for use on flammable liquids PLATON FLOSTAT TYPE MN FLOSTATS from Roxspur Measurement & Control are automatic flow control devices for liquids or gases. Once adjusted to the required value, flow is maintained accurately at this rate independent of pressure fluctuations in the supply or varying backpressures down- stream of the meter. No electrical power or external flow measurement input is required – the Flostat control system uses the line pres- sure available. FLOSTATS are ideal for blending or dosing applications to maintain the required delivery of valuable gases or liquids, despite process line -pressure changes. Similarly, FLOSTATS are ideal for use on gas sampling, purging or inert gas blanketing systems to maintain flow rate independent of back pressure. Bubbler type liquid level measurement systems benefit from improved accuracy and lower gas usage when fitted with a FLOSTAT. To assist in setting the correct flow rate, the Flostat type MN is frequently installed in line with a Platon type GU, NGI, LGI, NGIX, or LGIX variable area flowmeter. PRINCIPLE OF OPERATION The control valve varies the size of the orifice A. Flow through this orifice produces a pressure difference. P1- P2 which acts across the diaphragm B.This is opposed by the force from the spring C. The diaphragm modulates the flow from the Flostat discharge port, main- taining the internal pressure drop P1-P2 constant and equal to the spring force. This produces a constant flowrate, determined by the orifice size set by the valve. For liquids, the Flostat (Type MNA) will maintain a constant flowrate irrespective of any pressure changes whether up or downstream. For gases, the Flostat can compensate for pressure variations only on one side of the unit, because gas compressibility affects the orifice calibration. Type MNA units give a constant flow when the supply pressure is relatively constant - these units compensate for variations in discharge or downstream back pressure. Type MNB units are used to maintain constant flow when the supply pressure is varying, but where discharge pressure is relatively constant (eg discharge to atmosphere).

© TT Electronics plc Issue B 7/2017 Page 2 TT Electronics | Roxspur Measurement & Control Ltd

2 Downgate Drive, Sheffield, S4 8BT, England |Ph: +44(0)114 244 2521

www.roxspur.com | sales@roxspur.com General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. Every effort has been made during the preparation of this document to ensure the accuracy of statements and specifications. However, we do not accept liability for damage, injury, loss or expense caused by errors or omissions made. We reserve the right to withdraw or amend products or documentation without notice. Head Office: 2 Downgate Drive, Sheffield, S4 8BT, England Tel: +44(0)114 244 2521 Fax: +44(0)114 243 4838 Dimensions SPECIFICATION Models: MN*B: MN*S: Brass polyester coated 316 Stainless Steel MN*B MN*S Diaphragm & Seals Nitrile PTFE Temperature Max 80˚C 100˚C Pressure Max 20 bar 28 bar Max. operating DP Min. operating DP Connections Control accuracy 7 bar See table below 1/4 BSP Parallel ±2% liquids ±3% gases SECTION DIAGRAM Brass Body S/S Body Water (20˚C) Air (ATP) MNAB11 MNAB21 MNAB31 MNAS12 MNAS22 MNAS32 2-200 50-1500 250-3500 5-5000 100-30,000 8000-100,000 0.3 bar 0.7 bar 2.3 bar FLOW RANGES AND MODELS ORDER CODE CONTROL RANGE (cm³/min) MINIMUM DP FOR CONTROL Options available MNBB and MNBS models for gas flow with varying supply pressure. For larger capacities, 1/2" to 4" line sizes, use Type V Flostats (See leaflet DS1521). Installation Flostats Type MN can be installed in any orientation. Ensure that the flow is in the direction of the arrow on the label. Flostats are suitable for clean dry gases or clean liquids: any particles could restrict the flow through the control office.