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FLOW Product Data Sheet Platon Metal Tube VA Gas or Liquid PLATON METAL TUBE VA FLOWMETER TYPE GMT GMT metal tube flowmeters are variable area meters of totally welded stainless steel construction. Liquid or Gas flowing up the tapered flowtube lifts the float to an equalibrium position, dependent on flow rate, and a magnetically coupled pointer indicates this flow on an external scale. The large meter indication is easily visible at a distance, with the pointer moving over a 1500 scale. Each scale is produced specifically for the fluid involved and process conditions expected: several flow ranges are available for meters of each standard line size. All gas flow meters are supplied with an integral piston damper to smooth out flow pulsations. Installation is simple, in a vertical section of flow line: meters can be supplied with EN, ANSI or other standard flanges, or BSP or NPT screwed connections. The robust construction with no glands or seals to leak means the meters are suitable for high pressure applications, or extremes of temperature.The standard GMT is totally self contained and needs no external power. Alternative materials are available to special order for example Hastelloy or Monel wetted parts. For lower cost, Brass or Stainless steel bodied meters `” 2” in size are available with screwed connections. The indicator can be provided with one or two flow alarm sensors, adjustable over the meter operating range. Full electronic transmission and totalisation is also available, using the “VAMPIRE” electronic module. FEATURES `” - 4” line sizes No power required Clearly visible meter Scaled for process fluids Easy installation - flanged or screwed No glands or seals Robust, simple construction Pulsation damper on gas meter PRINCIPLE OF OPERATION The metering element consists of a precision machined tapered tube and a float. The height to which the float rises in taper is determined by the gap at which upward flow force and float weight are balanced. A permanent magnet encapsulated within the stainless steel float drives the external magnetically coupled pointer. Float movement is related to flow rate, and the indicator scale is marked in the correct units of flow for the process conditions. The standard unit requires no electricial power. Because the measuring element is a sharp edged disc, the meter is relatively insensitive to viscosity changes in the fluid, and to pipe bends in the external pipework. The only moving part in the flow is the float, which is retained in place by float guides at either end of the meter. Metal tube meters are ideal for arduous industrial service as an alternative to large glass tube flowmeters. They have particular advantages, where fluids are opaque or staining, or to provide higher safety and security for dangerous or toxic fluids.

SPECIFICATION Flanged flow tube Flanges Line sizes Pressure Screwed flow tube Connections Pressure Float Pulsation damper 316 Stainless Steel, all welded construction EN1092-1 PN16 or ANSI 150 standard. Other flanges to order 15, 25, 50, 80, 100mm To flange rating, 100 bar max Brass or 316 Stainless Steel `” 1” or 2” BSPP or NPT standard , 75 bar max GMTB (Brass) 100 bar max GMTS (Stainless) 316 Stainless Steel PVC float on low pressure drop option units All gas flowmeters have a dashpot damper built-in Indicator housing Protection Scale length Scales Turndown Accuracy Hysteresis Fluid...

FLOW RANGES STANDARD UNITS Flow Digit Flow Digits NOTES 1. Units will be scaled and calibrated for customers specific process conditions, which may differ from those trabulated (see overleaf ). 2. Typical maximum liquid viscosity is 50cP, lower for the highest flow ranges and small sizes. 3. Screwed 1” units are not available for Flow Digit 6. OPTIONS 1. Oxygen Service Standard units cleaned to required specification. Special units available with Brass internal construction 2. Alarm Output Sensor NAMUR type SJ2-N to DIN 19234 Approval EEx ia IIC T6 Single or dual alarms can be fitted to a...

ALTERNATIVE FLUIDS Approximate flow ranges for alternative process fluids and gas pressures can be calculated using the following formulae. For a full calculation please contact our Sales Team. Gases at pressure or temperature For air or gas flows where the pressure in the line on the discharge side of the flowmeter is not atmospheric (1.013 bar), multiply the flow range at ATP quoted in the table by a factor calculated as the square root of the pressure (in bar abs) divided by 1.013. Alternative gases For gases other than air, find the Relative Density (RD) of the gas compared to air, and...