Magnetic Level Gauges Remote Reading Systems Magnetic

1 Bulletin B 03 - 04 BONT MagneticLevel GaugesRemote ReadingSystemsMagnetic Level SwitchesBONT2 INDEXPagePageOperating ..3 Materials ..3 Operating Conditions ..3 Types and Classes ..3 Material Schedules ..4C to C Length ..4 Connections ..4 Accessories ..4-5 Startup and Stop ..5 Servicing ..5 Enquiries and Purchase Level Gauges -of Stainless Steelfor PN 10/40 - Synthetic Polymers ..8-of Stainless SteelPTFE lined ..9-Series for Water / Steamup to 210 bar pressure ..10-11-type MAG-RDR for Remote Direct Float immerse in the Vessel (Top Mounting) ..13 Remote Transmission System Type Elements.

2 15-Indicator / Trasmitter type MST-X ..16 Remote Transmission System Type Level Switches- type NUMBER Magnetic Level Gauges are designed and manufactured in compliance with the international standardsISO 9001, "PED" - 97/23/EC Pressure Equipment Directive and "ATEX" 94/9 instruments have been also approved by several bodies, organizations and national and internationalauthorities. For further information, please apply to our commercial department3 BONTOPERATING PRINCIPLEThe operation of the BONT Magnetic Level gauge is based onsome elementary physical principles.

3 The principle whereby the liquid in communicating vessels isalways at the same Level ,Archimede s principle according to which a body immersed ina liquid receives a buoyancy equal to the weight of displacedliquid,The principle of attraction between North and South poles oftwo permanent magnets and that of repulsion between principle has two applications in the BONT magneticlevel gauge:first between the magnet in the chamber float and every sin-gle magnet of the indicating scale,second between the magnets of the indicating Level Gauges are very suitable for interface Reading .

4 Thelevel gauge float has only to sink in the liquid having lower spe-cific gravity and to float on the liquid having higher specific spite of its simple operating principle, the BONT magneticlevel gauge represents the result of long research and experi-ence in design, sizing, choice of materials and manufacturingtechnology, which brought to the production of one of the mostreliable measure instrumentsDESIGNThe BONT Magnetic Level gauge consists of:a vertical chamber consisting of a tube of suitable diameterand thickness containing a float wherein a permanent magnetis placed exactly on the liquid Level line;two horizontal stub pipes for connection to the vessel contain-ing the liquid of which we wish to know the Level ;two stop valves (recommended, but not mandatory) one oneach stub pipe, to isolate the Level gauge.

5 An indicating scale, outside the vertical chamber, consisting ofa case of non- Magnetic material with transparent front facecontaining a set of small permanent magnets enclosed insmall cylinders which can rotate on their horizontal cylinders show an external surface having two to the orientation of each magnet (due to the actionof the magnet in the float) each cylinder will show externally halfof its surface of one colour or the indicating scale will be of one colour ( white) over thechamber area taken up by gas, vapour or steam phase con-trasting with the other colour ( red) over the chamber areataken up by liquid system for damaged float.

6 The three bottom cylinders ofthe indicating scale are placed lower than the bottom connec-tion of the Magnetic Level gauge. They are used for control offloat efficiency. With float damaged and its consequent sinkingin the liquid, these three cylinders show the yellow application range is very wide and includes all the situa-tions where the fluids are:at high pressure, at low or high temperature,at low pressure, at low or high temperature,chemically aggressive,pollutant to environment,noxious or poisonous for people health,inflammable or explosive,with identical optical characteristics of the superimposedphases (interface)MATERIALSThe most utilised materials are:Vertical Chamber.

7 Tp 316 - Tp 316L - Tp 321 PVC - PP - PVDF - PTFEF loat:Tp 316 - Titanium - PVC - PP - PVDF - PTFEI ndicating Scale:Austenitic stainless steel / glass, Water proof - IP 65AS per IEC to the operating conditions, we supply Level gaugewith the most suitable combination of materials. Iron, copperand silver alloys are normally materials, like Hastelloy, Incoloy, Titanium, Zirconium,6Mo, etc. will be supplied on CONDITIONSThe BONT Magnetic Level Gauges are manufactured in differ-ent Types and Classes, for various operating conditions, listedbelow in Fig.

8 Operating and design conditions must be clearly indicatedto choose a suitable Level gaugeThe selection of the Level gauge depends also on the specificgravity of the vessel liquid (see page 7 and following)If you want to use a Level gauge for conditions different (lesssever too) from those to which it was originally supplied, pleasecontact our Engineering Department. Fig. 3342 BONT Magnetic Level Gauges 10 +203850100120150200250300350375400999999 999977A1A1A1A1A1A1A1A1A1A1A1A12727262018 161311101077A2A2A2A3A3A3A4A4A4A4A5A56060 6050453922171210109B1B1B1B3B4B5B6B6B7B8B 9B10606058585248423927C1C1C2C2C3C4C5C6C7 118118118857166383329181513F1F1F2F3F4F5F 6F7F8F9F10F11118115115988880676563G1G1G1 G2G3G4G5G6G71701701701701681671651601551 49146144H1H1H1H1H1H1H1H1H1H1H1H129129129 1265255240220205195190185180N1N1N1N1N1N1 N1N1N1N1N1N13883883883883853853853703503 35330325P1P1P1P1P1P1P1P1P1P1P1P1 Type - ClassMAX operating temperature ( C)

9 MAX Operating Pressure (bar)MAG / MNP ClassMAX Operating Pressure (bar)MAG / MLP ClassMAX Operating Pressure (bar)MAG / TLP ClassMAX Operating Pressure (bar)MAG / TLPS ClassMAX Operating Pressure (bar)MAG / THP ClassMAX Operating Pressure (bar)MAG / THPS ClassMAX Operating Pressure (bar)MAG / THPX ClassMAX Operating Pressure (bar)MAG210 / THP ClassMAX Operating Pressure (bar)MAG210 / THPS Class--BONTINDICATING SCALEEach instrument is equipped with an indicating scale, fixed tothe gauge chamber, fixed to the gauge chamber by means ofbrackets with spring or hose scale is made of rotating cylinders housed in a one piececase of austenitic stainless steel with glass in the front to allowthe scale allows continuous Reading .

10 The length of the scale issuitably sized for the gauge;Axis to axis distance between cylinders is 10 last bottom five cylinders of the indicating scale, positionedbelow the bottom nozze connection to the vessel, provide visu-al alarm indication in case of float failureDifferent versions of the indicating scale are available:Standard ScaleThe standard scale is water proof. The sealing is obtainedusing silicone cylinders are of plastic material of white/red colour, suitable for fluid operating temperature up to 200 Temperature ScaleIn this scale the cylinders are of special plastic material of white/black colour, suitable for fluid operating temperature up to 400 C.