/ Level / Bypass-Level Measurement and -monitoring Level-Measurement and -monitoring Versions: Measuring range (ME): The distance between the upper and the lower lateral connection is specified in millimeters. The maximum length of a measuring tube is 6000 mm for greater lengths up to 25000 mm, however, several reference tubes must be used. For a length of 2000 mm and above, we recommend equipping the magnetic level gauge with a welded bracket for additional securing (Option /7). If the free space (dugout) between the lower connecting piece and the base or the space (projection) between the upper connecting piece and the ceiling are in one way or the other restricted, the relevant maximum parameter must be specified in detailed text at the time of placing an order. In an empty vessel, the float for the MA-400 is located in the so-called float-sack below the connec- tion and in a full tank in the projection above the connection. This means that these dimensions must correspond with at least the float length. However, since the float‘s mounting length also depends on the media density, special materials like titanium must be used in case of space constraints, if necessary, in order to reduce the float length. Measuring tube material: The measuring tube can be selected from the following materials: stainless steel, coated stainless steel, titanium, Alloy C and various plastics. The decision basis are here the medium, maximum measu- ring range, pressure and temperature. Measuring tube diameter: Depending on the material execution and the pressure in the tank different measuring tube diameter are chosen. The corresponding options are the variants taken from the datasheet. Process connection: Flanges as per EN or ANSI, female and male threads or welded ends are the most commonly used features for connecting the MA-400 to the side of the vessel. Customized solutions like alig- ning the connecting piece on top/ below or on top/laterally or at the bottom/laterally are available on request. Nominal diameter and pressure level for flange: The precise name of the connecting flange on the vessel must be specified in a detailed text. Some examples are flange DIN EN 1092-1 DN25 PN16 form B1 or ANSI 1“ 300 lbs RF. Standard flanges are DIN EN 1092-1 DN15 PN16 with sealing bar form B1. Thread for screw neck or bushing: If a screw neck or a bushing is selected as a variant for the connection, the thread size must be specified in detailed text. Here the standard is G3/4“. All normally used inch or metric thread systems are available on request. Measuring tube connection top: An overview of the various possible variants of the upper measuring tube connection, such as with ventilation screw, valve or flange, is located on the last page of this data-sheet. Measuring tube connection bottom: An overview of the various possible variants of the lower measu- ring tube connection, such as with drain plug, valve or flange is located on the last pages of this data sheet. Float type and length: The matching float is selected from the float tables of this datas- heet.The criterias are material resistance to the medium, pressure, temperature and diameter of the float (must fit into the selected measuring tube). From the float length the user determines the surfacing volume of the float at a known specific gravity of the medium being measured. The ideal surfacing volume at which liquid level and magnet system are on one level is shown in bold. Also, the length of the float-sack below the lower connection and in a full tank the projection above the upper connection depends on the selected float length. Should the application be subject to space limitations, it is advisable to choose a lighter float material such as titanium, thus saving on float length. Indicator bar: Depending on the ambient temperature at the measuring tube outer wall, indicator bars are chosen with ceramic rollers for tem- peratures up to 400°C or standard rollers for temperatures up to 200°C. Rotary secured versions guarantee a clean turn around of the magnetic rollers even due to vibration. For rough atmosphe- res versions with stainless steel jacketed housings are available. Approvals: Various approvals are available for the magnetic level gauge type of MA-400 such as ATEX, GL, DNV, GOST, BV, ABS and, if necessary, they are tested with regard to the Pressure Equipment Directive. Since the devices are modular assembled (contacts, sensors, indicator bar etc.) it must be ensured, that all compo- nents used meet the required approval. Options: With regard to options, specifiy in detail whether the MA-400 should be provided with electrical limit contacts and as to how many (option /1). A circuit with a protective resistor or a combi- nation of resistors, which offers a behavior according to NAMUR, is available for the contacts (option /2 and /3 ). Optionally, for remoute transmission of level value a reed contact measuring transmitter (option /4 and /5) or a magnetostrictive sensor (opti- on /6) can be mounted externally to the MA-400 which provides a 4 to 20 mA signal at the output (see also FM-01F and FM-02N for details). Mounting brackets stabilize the magnetic level gauge for lengths above 2 meters (option /7). With strong shocks in the container damping springs are recommended at the top and bottom of the measuring tube (option /8 and /9). Solid and remo- vable insulation against cold and heat (option /10 , /11 and /12), trace heating against frost (option /13 and /14), angular scales with various engravings (option /15, /16 and /17) and a cover for concealed or isolated indicator bars (option /18) round off the equipment possibilities. address Schleusenstraße 3 | D-27568 Bremerhaven | Germany | tel +49 (0)471 98 24 151 fax +49 (0)471 98 24 152 | mail info@profimess.de | web profimess.com rev. 2019-04 / 71