platon glass variable area flowmeters DS1115 ? tt electronics plc issue b 7/2017 page 1 tt electronics | roxspur measurement & control ltd 2 downgate drive, shefeld, 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 specifcaton without notce or liability. all informaton is subject to tt electronics own data and is considered accurate at tme of going to print. features: ? improved industrialized constructon ? easy to use, high visibility scale ? rear blow out safety vent ? ergonomic design ? uv stabilized rigid safety cover ? gas or liquid fow measurement ? operator confdence from foat rotaton ? instantaneous response ? accuracy up to 1.25% fsd ? air fow range 5 ml/min to 150 l/min ? customized scales ? glass tube removal without tools ? atex infra - red alarm opton ? range of accessories ? ukas calibraton optonal ? available from stock ? next day delivery (subject to specifcaton) ? afer scales serviced and repair flowmeter choice a complete va fowmeter consists of a glass fow tube and foat scaled to the fow units required, and a frame to provide the end block supports and to cover and protect the tube. the ngx series frames use fow tubes with nominally 100mm long scales, whereas the smaller lgx frames use fow tubes with nominally 30mm scales. to choose a complete fowmeter select the frame code required, and separately specify the fuid fow range needed on the fow tube scale. ngx and lgx series frames are designed to ft your process. the optons available allow easy installaton, usually surface mounted on a vertcal panel. process connectons and labelling can be customized to suit the applicaton. accurate measurement flow up the tapered tube lifs the foat to an equilibrium positon. flow rate is then measured against the fat top edge of the foat. engineered to fit ? standard or custom scaled glass tubes to suit process fuids and conditons ? range of process connectons to ft pipe - work requirements ? brass or stainless steel end blocks with optonal integral fow control valve ? supplied with studs for surface panel mountng
? tt electronics plc issue b 7/2017 page 2 tt electronics | roxspur measurement & control ltd 2 downgate drive, shefeld, 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 specifcaton without notce or liability. all informaton is subject to tt electronics own data and is considered accurate at tme of going to print. platon glass variable area flowmeters DS1115 specification - frames backplate endblocks seals cover connectons max. temp max . pressure valve opton mountng stud white polyester powder coated aluminum sufx b C bright nickel plated brass sufx s C stainless steel nitrile on brass units viton on stainless steel units alternatve seals available clip on clear uv stabilized rigid polycarbonate (required to locate fow tube into end blocks) models available with in - line or rear facing process connectons (see page 3). 100c with viton seals, 80c with nitrile seals recommended maximum operatng in non - shock applicatons: 16 bar fine control valve opton has needle valve fted on fowmeter inlet m5 studs 13mm long c/w nut flowtube scale scale length float accuracy calibraton borosilicate glass, precision molded in three diameters to suit fow range fused ceramic black ink ngx series C 100mm nominal lgx series C 30mm nominal precision machined foat, rotates to give fow visualizaton model hd: hollow dural, red anodized model hs: hollow stainless steel model ss: solid stainless steel 1.25% fsd standard for ngx series (2.5% for 1chd/bhd models, 3% for predicted scales) 5% fsd for lgx series all tubes are fow tested. standard scales are for air & water, as listed. custom scales to suit process fuid specification - flowtubes ngx flow ranges C 100mm scale * - sufx leter defnes standard scale markings. tubes can be custom scaled for the required fuids and line pressure/ temperature conditons (see correcton factors on page 4). model (for gases) sufx - b sufx - d frame size gtf1chd - * gtf1bhd - * gtf1ahd - * gtf1ahs - * gtf2chd - * gtf2bhd - * gtf2bhs - * gtf2ahd - * gtf2ahs - * gtf3ahd - * gtf3ahs - * gtf3ass - * 5 - 100 cm 3/ min 20 - 250 cm 3/ min 60 - 600 cm 3/ min 0.1 - 1.2 l/min 0.2 - 2 l/min 0.6 - 5 l/min 1 - 10 l/min 1 - 12 l/min 2 - 25 l/min 6 - 50 l/min 10 - 100 l/min 30 - 150 - - 2 - 40 l/h 5 - 70 l/h 10 - 120 l/h 30 - 300 l/h - 50 - 700 l/h 0.1 - 1.5 m 3/ h 0.3 - 3m 3/ h 0.6 - 6m 3/ h - 1 1 1 1 2 2 2 2 2 3 3 3 model ( for liquids ) sufx - c sufx - e frame size gtf1ahs - * gtf1ass - * gtf2bhs - * gtf2ahs - * gtf2ass - * gtf3ahs - * gtf3ass - * 2 - 25 cm 3/ min 10 - 80 cm 3/ min 20 - 280 cm 3/ min 50 - 800 cm 3/ min 0.2 - 1.5 l/min 0.2 - 3.0 l/min 0.4 - 4.4 l/min - 0.6 - 4.6 l/h 1 - 16 l/h 2 - 46 l/h 10 - 90 l/h 10 - 180 l/h 20 - 270 l/h 1 1 2 2 2 3 3 air @ atp (1.013 bar abs. & 20?c) air @ atp (1.013 bar abs. & 20?c) lgx flow ranges C 30mm scale tubes can be custom scaled for the required fuids and line pressure/temperature conditons. model (for gases) air @ ato (1.013 bar abs. & 20?c ) frame size rgtf1 chd - a rgtf 1 bhd - a rgtf 1 ahd - a rgtf 1 ahs - a rgtf 2 chd - a rgtf 2 bhd - a rgtf 2 ahd - a rgtf 2 ahs - a 5 - 100 cm 3/ min 50 - 250 cm 3/ min 50 - 500 cm 3/ min 100 - 1000 cm 3/ min 0.5 - 2.5 l/min 0.5 - 5 l/min 2 - 10 l/min 5 - 25 l/min 1 1 1 1 2 2 2 2 model (for liquids) water at 20?c frame size rgtf 1 ass - c rgtf 2 bhs - c rgtf 2 ahs - c 1 - 5 l/h 5 - 15 l/h 5 - 40 l/h 1 1 2 ngvx lgvx
? tt electronics plc issue b 7/2017 page 3 tt electronics | roxspur measurement & control ltd 2 downgate drive, shefeld, 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 specifcaton without notce or liability. all informaton is subject to tt electronics own data and is considered accurate at tme of going to print. platon glass variable area flowmeters DS1115 standard frame codes ngx t b 3 1 2 flowmeter types ngx C standard size (100mm scale ) lgx reduced size (30mm scale) end block style i in - line connectons t rear facing connectons v C built in needle valve with rear connectons end block material b - brass s - stainless process connectons 1=1/4 bspp 2 =1/4 npt o - ring seals 1 = nitrile 2 = vitron frame size chosen to suit fow tube required external connections process connectons: standard g1/4 (1/4 b8pp) or 1/4npt mountng stud: m6 threaded with nut to locate meter on a vertcal panel safety vent: allows rear discharge of process fuid in event of glass tube breakage. ?20mm x y z out in ?20mm w dims ngx lgx w 30 30 x 121 85 y 184 108 z 210 134 dimensions in mms roxspur measurement and control manufacture a range of accessories for use with ngx and lgx flow- meter. infrared optcal alarm modules can be fted to the fowmeter frame, giving a high or low rate alarm output directly from the dc powered module. a sepa- rate mains supply unit and slave relay alarm output is available. the bench stand can be used to support a free stand- ing fowmeter, type ngx or lgx, partcularly for laboratory or portable use with nozzle connecton if required. the fush mountng bezel is available for either valved or non - valved ngx series units, allowing the fowmeter to be mounted behind a makrolon window in a control panel. additonal connectors, fow control valves and automatc fow controllers can be supplied to allow fne fow rate adjustment and maintain gas or liquid fow despite line pressure changes, partcularly useful for blending or analysis applicatons. for further informaton, please ask for the separate data sheets. ngxv with alarm sensor (gir) and bench stand accessories constructon of the ngx and lgx series frames makes custom build or special process connectons easily achievable, whether for rear facing or mixed rear/in - line ftngs. specifc custom logos can be printed on the glass tubes and polycarbonate covers if required to suit the applicaton. custom build
? tt electronics plc issue b 7/2017 page 4 tt electronics | roxspur measurement & control ltd 2 downgate drive, shefeld, 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 specifcaton without notce or liability. all informaton is subject to tt electronics own data and is considered accurate at tme of going to print. platon glass variable area flowmeters DS1115 hazardous fluids the rear blowout vent and polycarbonate cover on ngx and lgx fowmeters ofer a measure of operator protecton from glass tube rupture or process leakage. however, for increased operator protecton or use on exposed plant pipework, model gu safety housings should be used with glass tube meters. alternatvely, type api or gmt metal tube meters provide the highest security and integrity. ngx and lgx fowmeters are not recommended for hydrochloric acid or chlorine because of corrosion of the end blocks. similarly, sulphuric acid below 80% atacks stainless steel. borosilicate glass is atacked by fuorine and most of its compounds and high concentratons of caustc soda. flowmeters constructed from ptfe or plastc materials are available and can be used for some of these chemicals. ammonia atacks brass, but can be used with stainless steel end blocks and nitrile o - ring seals. the va fowmeter principle is suitable for transparent liquids and some slurries: should the foat become stuck in the tube this is visible, and the fow blockage will cause the foat to rise. for scales please contact the sales ofce for help with your partcular applicaton or use the tables below which contain some of the c omm on stand- ard fow scales that we provide. glass scales flow scales on va glass tubes are normally expressed in volume fow rate of gas referred to atp (1.013 bar abs. & 20oc).the s tan dard scales for air are calibrated for process conditons in the fowmeter measuring tube also at 1.013 bar abs. & 20oc. if the pr oce ss/ temperature is diferent, or the gas involved is not air, then a new scale can be computer predicted and fred onto the tube. ro xspur measurement and control specializes in producing scales custom labelled for the site conditons and gas mixtures to be measur ed. the tabulaton shows some of the tubes available as standard for diferent gases, measured at atp process conditons. gas tube and float code: fgtf - 1chd 1bhd 1ahd 1ahs 2chd 2bhd 2ahd 2ahs 3ahd 3ahs code/ suffix 5 - 100* 10 - 150* 5 - 80* 20 - 120* 10 - 100* 10 - 100* 10 - 120* 10 - 100* 25 - 250* 10 - 150* 5 - 100* 5 - 90* 30 - 140* 20 - 250 * 30 - 350 * 20 - 200 * 50 - 290 * 30 - 250 * 20 - 250 * 30 - 360 * 20 - 250 * 50 - 600 * 40 - 360 * 20 - 250 * 20 - 220 * 40 - 300 * 60 - 600 * 50 - 900 * 60 - 560 * 100 - 700 * 50 - 700 * 50 - 700 * 0.1 - 1.1 * 50 - 800 * 0.2 - 2 * 0.05 - 1 * 60 - 600 * 40 - 600 * 100 - 750 * 0.1 - 1.2 0.1 - 1.5 0.1 - 1 0.1 - 1.1 0.1 - 1 0.1 - 1.2 0.1 - 1.8 0.1 - 1.8 0.2 - 3.4 0.1 - 1.7 0.1 - 1.2 0.1 - 1.1 0.1 - 1.2 0.2 - 2.0 0.3 - 2.5 0.2 - 1.7 0.4 - 2 0.2 - 1.8 0.2 - 2 0.3 - 3 0.2 - 3 0.4 - 5 0.4 - 2.8 0.2 - 2 0.2 - 1.8 0.3 - 2.2 0.6 - 5.0 0.8 - 5.8 0.6 - 4 0.8 - 4 0.8 - 4.4 0.6 - 5 1 - 8 0.5 - 9 1 - 15 1 - 7 0.6 - 5 0.6 - 4.4 0.8 - 4.8 1 - 12 1 - 14 1 - 10 1 - 10 1 - 10 1 - 12 2 - 22 2 - 28 2 - 44 1 - 18 1 - 12 1 - 12 1 - 11 2 - 25 2 - 28 2 - 22 2 - 18 2 - 20 2 - 26 2 - 48 4 - 60 5 - 95 2 - 36 2 - 25 1 - 25 2 - 22 6 - 50 6 - 54 4 - 40 4 - 36 4 - 40 4 - 50 10 - 90 10 - 120 10 - 180 10 - 65 6 - 50 4 - 48 4 - 40 10 - 100 10 - 110 10 - 85 10 - 75 10 - 80 10 - 100 20 - 180 20 - 270 40 - 380 15 - 140 10 - 100 10 - 100 10 - 85 b f j m r g k n s h l p t flow ranges for standard 100mm scale gtf tube (l/min at 1.013 bar abs. & 20?c) air acetylene argon butane carbon dioxide carbon monoxide cracked ammonia helium hydrogen methane nitrogen oxygen propane an approximate guide to the efect of non standard process conditons is shown below. the tabulaton gives the multplying fa cto r to be used on any gas fow scale reading resultng from process temperatures or pressures at the measurement tube diferent to the atp values. gauge pressure 0 1 2 4 7 6 0?c 20?c 40?c 1.036 1.0 (atp) 0.967 1.460 1.410 1.364 1.786 1.724 1.670 2.304 2.222 2.151 2.725 2.632 2.544 2.915 2.817 2.717 *cm 3/ min
? tt electronics plc issue b 7/2017 page 5 tt electronics | roxspur measurement & control ltd 2 downgate drive, shefeld, 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 specifcaton without notce or liability. all informaton is subject to tt electronics own data and is considered accurate at tme of going to print. platon glass variable area flowmeters DS1115 every efort has been made during the preparaton of this document to ensure the accuracy of statements and specifcatons. h owe ver, we do not accept liability for damage, injury, loss or expense caused by errors or omissions made. we reserve the right to withd raw or amend products or documentaton without notce. head ofce: 2 downgate drive, shefeld, s4 8bt, england tel: +44(0)114 244 2521 fax: +44(0)114 243 4838 o4hwar0410 liquid scales the scaling of liquid va fowmeters is afected by the density and viscosity of the fowing liquid. as a guide, the maximum viscosity measurable on glass va meters is typically: size 1 6cp (ss) size 2 12cp (hs) 20cp (ss) size 3 20cp (hs) 36cp (ss) for liquids with viscosity below the fgure, the fow tube fsd can be estmated using the graph below, according to the density of the liquid. the multplying factor to be used on the water fow tube scale is ploted against liquid sg: this gives the volume fow rate of the liquid when monitored with that tube and foat, which can be custom scaled appropriately.
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