Category: Variable Area Flow Meters

Variable Area Flow Meters

Variable area flowmeters are very simple. These versatile flow measurement devices are used on liquids, gases, and steam. They operate on the variable area principle.

  • Anaesthetic VA Flowmeter Platon DS1170

    Anaesthetic VA Flowmeter | Platon DS1170

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    Anaesthetic VA Flowmeter - Overview

    The Platon glass Variable Area (VA) flowmeters are ideal for the measurement of anaesthetic gases. The free float is instantaneous in response, and the visible float rotation immediately confirms the correct flowmeter operation to the operator. VA flowmeters are highly repeatable in operation, giving reliability and confidence. The ceramic ink scale is fused into the glass tube's outer surface, and cannot be removed or displaced. Calibration accuracy can be specified to suit the application, with each tube and float individually gas flow calibrated. Tubes and floats are supplied as a calibrated set, normally without a frame. These are then incorporated into the manufacture of anaesthetics trolleys or other equipment.

    Anaesthetic VA Flowmeter - Features

    • Instantaneous response
    • Reliable Operation
    • High visibility scale fused into flow tube surface
    • Float rotation gives the operator confidence of correct performance
    • Borosilicate glass tube, anti-static coated to avoid static build-up
    • Flow ranges from 10:1 to 150:1 available
    • Individual flow calibration
    • Standard gases - air, oxygen, nitrous oxide
    • Bold scale markings
    • Gas colour coding for easy identification
    • Keyed lengths to ensure correct installation
    • Customer logo or flow limit marks

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  • Compressed Air VA Flow Meter DS1173

    Compressed Air VA Flow Meter | DS1173

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    Compressed Air VA Flow Meter - Overview

    These variable area flowmeters are calibrated for direct reading of compressed air at 7 bar and 20°C. They have metal bodies which operate using a spring loaded orifice moving over a tapered cone, to achieve a variable area meter. Flow is indicated by a magnetic follower ring under a scale on an external glass tube.

    Compressed Air VA Flow Meter - Features

    • Brass, Stainless Steel or Aluminium models
    • Calibrated for direct reading of compressed air at 7 bar and 20°C
    • Works in any orientation
    • Available in 5 sizes
    • Pressures up to 41 bar (600 psi)

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  • Gapmeter Type SGUV Platon DS1160

    Gapmeter Type SGUV | Platon DS1160

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    Gapmeter Type SGUV - Overview

    The type SGUV and type SGUL are direct reading Flowmeters for clean liquids and gases in pipe sizes larger than 30mm. They provide a robust and cost effective method of flow measurement. The indicator housing can be mounted locally to the pipe or remotely by the use of flexible impulse tubing. The instrument is a combination of two measuring principles. It is essentially a pressure differential device consisting primarily of an accurately machined orifice plate located in the main pipework. This produces a pressure drop proportional to the square of the flow rate. A secondary orifice restrictor located in the by-pass flowmeter is accurately calibrated to produce a by-pass flow that can be measured by the glass VA type flowmeter, scaled in terms of the main pipe flow. The metering elements are manufactured to a high standard of interchangeability with boldly marked indicating scales and dynamically balanced floats.

    Gapmeter Type SGUV - Features

    • Easy of installation
    • Available for various flanges
    • Instantaneous reading
    • Compact and rugged construction
    • Optional flow alarm
    • Maintenance possible under flow conditions
    • Interchangeable components provide low cost unit
    • Only one moving part
    • Calibration for wide range of gases and liquids

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  • Glass Tube Variable Area Flowmeters DS3601-100mm

    Glass Tube Variable Area Flowmeters | DS3601-100mm

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    Glass Tube Variable Area Flowmeters -  Overview

    This Glass Tube Flowmeter uses a 100mm scale length borosilicate glass tube and a float. As it is based on the variable area (VA) principle, these flowmeters provide clear, simple and reliable operation. They are individually scaled and calibrated according to the customer's requirements. The fluid or gas flows vertically upwards through the tapered glass tube, causing the float to rise to an equilibrium position. The flow rate is measured by reading the top edge of the float against the scaled tube. Suitable for use with gasses or water (eg. cracked ammonia, helium, hydrogen, methane, nitrogen, oxygen, propane).

    Glass Tube Variable Area Flowmeters - Features

    • Instantaneous response
    • Simple and reliable operation
    • Low line pressure loss
    • High resolution
    • Custom scales available on request

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  • Horizontal Display Metal Tube Rotameter | QTLZ Table 1: Horizontal Display Metal Tube Rotameter Data Sheet Measuring range Water (20℃)                  16~150000 l/h. Air (0.1013MPa 20℃)       0.5~4000 m3/h.  Range ratio 10:1 (Special type 20:1).  Accuracy class 2.5 (Special type 1.5% or 1.0%).  Working pressure DN15~DN50 PN16 (Special type 2.5MPa). DN80~DN150 PN10 (Special type 1.6MPa). Pressure rating of jacket 1.6MPa.  Medium temperature Normalised type -80℃~+220℃. High-temperature type 300℃. Lined with FEP type ≤85℃.  Ambient temperature -40℃~+120℃ (Remote display without LCD≤85℃). (Remote display with LCD≤70℃).  Dielectric viscosity 1/4” NPT, 3/8” NPT 1/2” NPT≤5mPa.s 3/4” NPT,1” NPT ≤250mPa.s  Output Standard signal: two-wire system 4 ~ 20mA (with HART communication) Standard signal: three-wire system 0 ~ 10mA Alarm signal:1.Two-way relay output 2. One-way or two-approach switches Pulse signal output: 0-1KHz isolated output  Process connection Standard type:24VDC±20% AC type:220VAC(85~265VAC) (optional)  Connection mode Flange Thread Tri-clamp  Levels of protection IP65/IP67.  Ex-mark Intrinsically safe: ExiaIICT3~6.    Exd type: ExdIICT4~6. Table 2: Horizontal Display Metal Tube Rotameter Flow Range Calibre (mm) Work number Flow range Pressure loss kpa Water L/h Air m3/h Water Kpa Air Normal type Anti-corrosion type Normal type Anti-corrosion type Normal type Anti-corrosion type 15 1A 2.5~25 -- 0.07~0.7 6.5 - 7.1 1B 4.0~40 2.5~25 0.11~1.1 6.5 5.5 7.2 1C 6.3~63 4.0~40 0.18~1.8 6.6 5.5 7.3 1D 10~100 6.3~63 0.28~2.8 6.6 5.6 7.5 1E 16~160 10~100 0.48~4.8 6.8 5.6 8.0 1F 25~250 16~160 0.7~7.0 7.0 5.8 10.8 1G 40~400 25~250 1.0~10 8.6 6.1 10.0 1H 63~630 40~400 1.6~16 11.1 7.3 14.0 25 2A 100~1000 63~630 3~30 7.0 5.9 7.7 2B 160~1600 100~1000 4.5~45 8.0 6.0 8.8 2C 250~2500 160~1600 7~70 10.8 6.8 12.0 2D 400~4000 250~2500 11~110 15.8 9.2 19.0 40 4A 500~5000 300~3000 12~120 10.8 8.6 9.8 4B 600~6000 350~3500 16~160 12.6 10.4 16.5 50 5A 630~6300 400~4000 18~180 8.1 6.8 8.6 5B 1000~10000 630~6300 25~250 11.0 9.4 10.4 5C 1600~16000 1000~10000 40~400 17.0 14.5 15.5 80 8A 2500~25000 1600~16000 60~600 8.1 6.9 12.9 8B 4000~40000 2500~25000 80~800 9.5 8.0 18.5 100 10A 6300~63000 4000~40000 100~1000 15.0 8.5 19.2 150 15A 20000~100000 -- 600~3000 19.2 -- 20.3 Table 3: Horizontal Display Metal Tube Rotameter Model Selection QTLZ X X X X X X X X X Indicator Code Local indicator Z LCD indicator with output D Nominal diameter Code DN15 -15 DN20 -20 DN25 -25 DN40 -40 DN50 -50 DN80 -80 DN100 -100 DN150 -150 Structure Code Bottom-top / Left-right (horizontal) H1 Right-left (horizontal) H2 Side-side AA Bottom -side LA Thread connection S Tri-clamp M Body material Code 304SS R4 316LSS R6L Hastelloy C Hc4 Titanium Ti Liner F46(PTFE) F Monel M Indicator type Code Iinear indicator(pointer indication) M7 Nonlinear indicator(LCD Display) M9 Combination function(only for LCD display) Code 24VDC with 4~20mA output S 24VDC with HART communication Z Battery power D Additional function Code Measuring tube with thermal preservation/heat insulation jacket T Measure medium temperature higher than 120.C HT Ex-proof: Code With W Without N Alarm Code One alarm K1 Two alarm K2 None N Horizontal Display Metal Tube Rotameter QTLZ

    Horizontal Display Metal Tube Rotameter | QTLZ

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    Horizontal Display Metal Tube Rotameter - Overview

    This Variable Area Rotameter is suitable for single-phase liquids or gas flowing in small/medium pipe diameters. It can be used with corrosive, toxic and explosive mediums. It has good stability and reliability. It has an easy-to-read LCD digital display screen and is easy to install. Applications include the Chemical, Pharmaceutical, Petrochemical, Food, and Metallurgical Industries.

    Horizontal Display Metal Tube Rotameter - Features

    • Horizontal Installation, easy installation and observation
    • Good stability and reliability
    • Suitable for single-phase liquid/gas with small/medium pipe diameter
    • Can be used for corrosive, toxic and explosive mediums
    • Two-wire 4~20mADC signal output
    • Easy-to-read LCD digital display
    • Range ratio: 10:1 (Special type 20:1)
    • Accuracy class: 2.5 (Special type 1.5% or 1.0%)
    • Medium temperature: Normalized type -80℃~+220℃
    • Ambient temperature: -40℃~+120℃(Remote display without LCD≤85℃)
    • Working pressure: DN15~DN50 PN16 (Special type 2.5MPa)

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  • Metal Tube Flowmeters SC250

    Metal Tube Flowmeters | SC250

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    Metal Tube Flowmeters - Overview

    This variable area, high-performance measurement flowmeter, is suitable for use in extreme working conditions. Can be used in liquid or gas flow measurement. Applications include water treatment plants, pulp & paper and food industries; pharmaceutical, chemical and petrochemical industries; power plants and nuclear-generating plants; heating and cooling circuits; saturated steam circuits; oven treatments and control of gas burners.

    Metal Tube Flowmeters - Features

    • Metallic tube with a robust construction
    • Indication using magnetic coupling
    • High-performance measurement in extreme working conditions
    • High resistance to corrosion
    • Low-pressure drop
    • Damping mechanism to avoid float bounces in gas and steam applications

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  • Metal Tube Purge Flowmeter Platon DS1210

    Metal Tube Purge Flowmeter | Platon DS1210

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    Metal Tube Purge Flowmeter - Overview

    Ideal for liquid or gas flow monitoring on small lines in purging, mixing or sampling systems. It uses a stainless steel tapered tube to create a variable area flowmeter. The magnetically coupled pointer shows flow rate on an external scale. Metal Tube Purge Flowmeters are used where the higher integrity offered by a metal flow tube is important, or where conventional glass flow tubes are not allowed in the process. The meters are available with inline (API) or rear-facing (APT) screwed connections. For fine flow rate adjustment, the APV model has an integral multi-turn needle valve. Scales are individually produced to show the actual fluid flow for the process fluids and conditions relevant. The units are suitable for flush mounting in a control panel, using a simple mounting kit. Standard units require no electrical connection.

    Metal Tube Purge Flowmeter - Features

    • For high integrity of high-pressure duty
    • Standard units require no electrical connection
    • Suitable for flush panel mounting
    • Scaled for specific process conditions

     

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  • Oil and Water Flow Meter DS1226

    Oil and Water Flow Meter | DS1226

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    Oil and Water Flow Meter- Overview

    This spring-loaded variable orifice meter can be mounted in any orientation. Oil or water flow moves the orifice along a scale printed on the borosilicate glass tube, to indicate the flow rate. Independent of viscosity changes up to 200 cs. The meter body is in polyester with standard 1" BSP threads. Used for flow visualisation.

    Oil and Water Flow Meter - Features

    • Works in any orientation
    • Oil and water calibrated
    • Pressures up to 10 bar
    • Flows 1 to 150 L/min
    • Accuracy ±5% FSD
    • Repeatability ±1% FSD
    • Switches - fully adjustable flow rate signalling

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  • Platon Plastic Tube VA Meter DS1132 GR/GRV

    Platon Plastic Tube VA Meter | DS1132 GR/GRV

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    Platon Plastic Tube VA Meter - Overview

    The Platon GR/GRV flowmeters are moulded plastic tube variable area meters with ball floats. The precision moulded tapered tube has guides to stabilise the float, allowing easy flow reading against the clear 50mm long scale. Units are available calibrated for air or water flows. Typical applications are for operator monitoring of cooling, purging or sample flows. The GRV option has a built-in multi-turn flow control valve for simple adjustment of flow rates. Designed for vertical mounting on a control panel, the flowmeter is supplied with brackets for flush mounting through a cut-out of approximately 116 x 19mm. Alternatively, the meter can be surface mounted. For an immediate indication of process alarm conditions, adjustable transparent indicators can be clipped into the flowmeter face, presenting a red limit line at the required flow rate. These accessories can be used to show the limits of normal flow adjustment or an alarm level. Reliable and rugged process connections are made to stainless steel 1/8 NPT female threads built into a stainless backplate within the meter. The polycarbonate body and flow tube are O-ring sealed to the backplate, and can simply be disassembled for any necessary cleaning or interchange of flow scales.

    Platon Plastic Tube VA Meter - Features

    • Low-cost flow indication
    • Air or water calibration
    • Easily readable 50mm scale
    • Stainless steel rear connections
    • Set point indicator flag
    • Flow control valve option

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  • Screwed Metal Tube VA Flowmeter Platon DS1221

    Screwed Metal Tube VA Flowmeter | Platon DS1221

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    Screwed Metal Tube VA Flowmeter - Overview

    This flowmeter is ideal for industrial use as an alternative to large glass tube flowmeters. Suitable for gas or liquid flow measurement at high pressures and temperatures, where the fluids are opaque or dark-coloured. It also provides high operational security for dangerous or toxic materials. Models GMTB and GMTS are brass or Stainless Steel tube flowmeters with female screwed connections. With 1/2”,1” and 2” BSP/NPT threaded fittings standard. The VA meter principle used in the Platon GMT flowmeter measures the position of a float in a precision-machined tapered tube. The float rises with the flow up the taper until the upthrust from the flow balances with the weight of the float. A magnet, electron beam welded into the float casing, drives the external meter indication over a 100mm scale typically displaying a 10:1 flow range. Options available on the GMTB/GMTS include (GMTA) flow alarm outputs for high or low adjustable set points and electronic 4-20mA flow transmitter (GMTX) outputs. All of these are available with CENELEC approval. All units are calibrated for the specific line conditions or fluid involved.

    Screwed Metal Tube VA Flowmeter - Features

    • Economic construction
    • BSP/NPT Screwed end fitting
    • Brass or Stainless Steel
    • Wide flow ranges
    • Sizes 15, 25, 50mm. 1/2”, 1”, 2” bore
    • Integral damping on gas flow lines
    • Local indication
    • Calibration for wide range of gases and liquids
    • Optional electronic outputs

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    Platon Variable Area Flow Meters Glass Tube DS1115

    Platon Variable Area Flow Meters Glass Tube | DS1115

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    Platon Variable Area Flow Meters Glass Tube - Overview

    Variable area flowmeters are produced with glass flow tubes in various lengths, for gas or liquid flow measurement. Glass tubes have higher pressure and temperature range than plastic tubes. They are easy to use and come in a variety of sizes. Suitable for use in medical (anaesthetic), industrial, and laboratory applications. The NGX series frames have flow tubes with measurements in 100mm long scales, whereas the smaller LGX frames have flow tubes with measurements in 30mm scales. These are easy to install, as they are usually surface mounted on a vertical panel.

    Platon Variable Area Flow Meters Glass Tube - Features

    • Improved industrialised construction
    • Easy to use
    • High visibility scale
    • Rear ‘blow out’ safety vent
    • Ergonomic design
    • Operator confidence from float rotation
    • Instantaneous response
    • Airflow range 5 mL/min to 150 L/min
    • Customized scales
    • UV stabilized rigid safety cover
    • Glass tube removal without tools
    • ATEX Infra-red alarm option
    • Range of accessories
    • Accuracy up to ±1.25% FSD
    • UKAS calibration optional

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