Magnetic level switch Magnetic level switch type MR783 1. DESCRIPTION page 3 1.1 Operation page 3 1.2 Application page 3 1.3 Description page 3 2. SPECIFICATIONS page 3 2.1 Service Conditions page 4 2.2 Design Data page 5 3. IECEx / ATEX SAFETY EQUIREMENTS page 5 3.1. IECEx / ATEX / explosion proof version "d" page 5 3.2. IECEx / ATEX / intrinsic safety version "ia" page 5 4. INSTALLATION page 6 Safety with regards to pressure page 6 Safety with regards to temperature page 6 Opening and closing of pressurized equipment page 6 5. SERVICING page 7 6. MAINTENANCE page 7 6.1 Replacement of a tank unit page 7 6.2 Reed switches replacement page 7 7. WARRANTY page 8 Houdec Instrument SAS
Magnetic level switch Read the manual handling OK DO NOT SHOCK DO NOT BEND INTERNAL GLASS PARTS! Page 2
Magnetic level switch 1. DESCRIPTION 1.1. OPERATION A float fitted with a magnet slides along a guide tube and follows variations of fluid level. The float unit onsist of a magnet-carrying float mounted around a stainless steel tube. As the float passes up the tube, a magnetic contact is actuated inside the guide tube. 1.2. APPLICATION The float unit can be directly mounted on a tank through a screwed or flanged connection. A second application is available as a magnetic switch indicator while fitted on the side of a magnetic level gauge for example. In this case, the MR783 float should be removed. The internal float of the gauge will directly activate the contacts into the tube. 1.3. DESCRIPTION Page 3
Magnetic level switch 2. SPECIFICATIONS 2.1. SERVICE CONDITIONS Type MR 783 I (ST-Steel) MR783 PVC MR 783 PVDF Min. Specific gravity 0,75 0,8 0,8 Max. Temperature 100 C 40 C 70 C Max. Pressure 32 bar * 3 bar 3 bar * For flanged instrument version, the nominal pressure of the flange should be in accordance with the operating pressures. 2.2. DESIGN DATA Connections of the process: - Threaded plug 2 BSPP or 2" NPT or on request - Flange NP16 / ANSI 150# / ANSI 300# (according to 29203 or EN1092 or ANSI B16.5) - Connection 3/8" BSPP (wiring length 1m) - Other type of connections or dimensions on request Detection housing type: Standard type Aluminium Code : H3 - Aluminium housing - Class of protection : IP 65 (80x75x60) - Packing gland : Polycarbonate material, fitted with retaining ring and shearing shield (wiring from 5 mm to 10mm) Flame proof version Aluminium (ATEX IECEx approved) Code : H2 Flame proof version Stainless steel 316L (ATEX IECEx approved) Code : H5 Intrinsic safety type Aluminium (ATEX IECEx approved) Code : H4 Intrinsic safety version Stainless steel 316L (ATEX IECEx approved) Code : H6 Contacts / Switches Standard contacts - Detection housing made of light aluminium alloy IP66 (110x80) - ATEX / IECEx / Flame proof certified : LCIE01ATEX 6060X IECEx LCI09 0017X - Marking : 0081 II 2 G Exd II C T6 - Packing gland : Standard Exd made of nickel brass or other according to Ex on request, suitable for armoured cables from 6,1mm to 12mm diameter size. - Detection housing made of stainless steel 316L IP66 - ATEX / IECEx / Flame proof certified : LCIE01ATEX 6060X IECEx LCI09 0017X - Marking : 0081 II 2 G Exd II C T6-T5 - Cable entry : M20 x 1,5 - Packing gland : on request - Aluminium housing IP65 (80x75x60) - ATEX / IECEx / Intrinsic Safety certified : LCIE05ATEX 6034X IECEx LCI08 0048X - Marking : 0081 II 1/2 G Exia II C T6-T5-T4 - Packing gland : Exe Pg11 made of blue polyamide (d = 6 to 10 mm) - Electrical settings : Ui 30V ; Ii = 50mA ; Pi = 0,4W ; Ci = 0nF ; Li=0mH - Detection housing made of stainless steel 316L IP66 - ATEX / IECEx / Intrinsic Safety certified : LCIE05ATEX 6034X IECEx LCI08 0048X - Marking : 0081 II 1/2 G Exia II C T6-T5-T4 - Cable entry : M20 x 1,5 - Packing gland : on request - Electrical settings : Ui 30V ; Ii = 50mA ; Pi = 0,4W ; Ci = 0nF ; Li=0mH - ILS / change over reed switches types - Max. current : 1 A - Max. voltage : 250V DC or AC - Max. power : 60VA/ 30W (resistive charge) - Quantity : MR783 : 1 to 4 Page 4
Magnetic level switch 3. GENERAL IECEx / ATEX SAFETY REQUIREMENTS 3.1. EXPLOSION-PROOF VERSION "d" BEFORE ANY INTERVENTION ON THE INSTRUMENT, USUAL PRECAUTIONS SHOULD BE TAKEN. For ATEX instruments installation, Refer to the attached leaflet: safety instructions for Marking example : detection box type B4. POWER SUPPLY SHOULD BE SWITCHED OF BEFORE ANY INTERVENTION. EXPLOSION-PROOF HOUSING MUST NOT BE OPENED WHILE ENERGIZED. - Always refer to the safety specifications instructions of the installation place and more particularly with regard to the hazardous zones as well as the dangerous products - The level switch can be used with flammable gases and vapours belonging to groups IIA, IIB and IIC and temperatures class of T6. - The installation of the instrument will be carried out by sorted personnel in conformity with the local installation standards. - The customer is responsible of the compatibility of connections of the instrument with the process conditions, with the sealing joint regarding the flange and of the electric connection in compare with the technical data and marking of the instrument. 3.2. INTRINSIC SAFETY VERSION "ia" The terminal blocks 4/20mA and sensors can be only connected to a intrinsic safety certified equipment and these combinations must be compatible as regard instrinsic safety rules. For ATEX instruments installation, refer to the attached leaflet: Safety instructions for detection box type B5/... Marking example : Page 5
Magnetic level switch 4. INSTALLATION This equipment must only be handled empty, with all essential precautions taken to avoid impact or major stresses, which would be likely to alter its geometry and damage internal measuring devices, or the contact pattern of the connecting component seals. The various parts must be connected without engendering any mechanical or other stresses, other than those provided for when installing the equipment, and sealing the connection. Under no circumstances must the equipment be used as a support or for mounting any part or component not originally provided for. Welding is prohibited. If welded connections or fastenings are required by the equipment definition, these must be produced by qualified personnel, using recognized operating procedures and the required materials, meeting current standards. Grinding, cutting or heating are prohibited on any parts of the equipment that are subject to pressure. The instrument must be installed in a vertical position. For a correct measure precision, it must stay in an upright position. SAFETY WITH REGARD TO PRESSURE This pressurized equipment is part of a unit, so the integrator must fit the installation with safety devices (valves, rupture disk, sensor, ) to protect the equipment against the risk of excess pressure. The opening pressure of these devices must equal the maximum allowable pressure (PS) of the equipment. The integrator must also provide a device for measuring residual pressure in the equipment (pressure gauge ) and a bleeder (piped if the product so requires), to guarantee the safety of personnel working on the equipment. Isolation valves are recommended to be installed between the equipment and the unit to which it is mounted, so that maintenance operations can be performed. Any other way (or design) may be achieved if they provide an acceptable safety level in accordance with the Directive 97/23/EC and/or present standards. SAFETY WITH REGARDS TO TEMPERATURE As far as this pressurized equipment is a part of an unit, all required measures regarding risks induced by temperature (regarding working personnel and the type of the material around according to the device s specification) shall be taken by the integrator. For example, a kind of protection could be achieved, by the insulation of warm components, by using protection devices for access, or using any other devices suitable with the site of the unit and standards in force. Do not either subject the device to significant temperature variations or fire exposure. OPENING AND CLOSING OF PRESSURIZED EQUIPMENT Prior to any action on pressurized equipment, the suitability of pressure and temperature conditions with thought operations must be checked by the permitted and qualified technician. Regarding equipment fitted with alarm switches, use shall be made with care: voltage, current, instruments (or security devices) controlled by theses switches Appropriate tools must be used when stripping parts to get access to the pressurized equipment. Refer to drawings or appropriate instruction note. Gaskets could be replaced if needed, check for bolt tightening Security rules must be checked (even for new devices) by the operator before pressurize. This equipment must not contain any fluid other than that (or those) for which it is designed. It is strictly prohibited to make any temporary or permanent modification, or to perform any operation likely to alter the physical, mechanical or metallurgical characteristics of any part, without the manufacturer's prior written agreement. A danger analysis has been performed, in accordance with appendix I of Directive 97/23/EC, based on the information provided. Any change with respect to this information, likely to call into question the safety of using the equipment, can only be made outside the manufacturer's responsibility. Before commissioning, the operator must make sure that the safety regulations applicable to pressurized equipment are respected and that the connected components work properly. This equipment is designed for static loads appropriate for the device's own weight and the specific stresses due to pressure and temperature as defined in the specifications. No additional load or stresses due to vibrations are accounted for, unless this is specifically agreed during the preliminary studies. Practical installation - This unit assembly can be fitted directly to the tank or the level gauge since it has been assembled and preadjusted in the factory for a specific range according to the tank height or the connections of the level gauge. Connect electrical wires This instrument contains ils switches and electronic components: DO NOT SHOCK or DO NOT BEND - the measuring systeme Page 6
Magnetic level switch 5. SERVICING This equipment was built in accordance with the essential safety regulations defined in the "Pressurized Equipment Directive" 97/23 EC, and taking into account the information provided with the order. It was designed, manufactured and carefully tested for the application as defined. It must be used in accordance with the information provided in the above-mentioned order. The operator should periodically verify the equipment's ability to continue in service. Periodic monitoring and inspections must be made in accordance with current regulations in the country in which the equipment is used. 6. MAINTENANCE The only precaution to be taken is to ensure that the instrument is positioned as near as possible to the vertical axis. The instrument is practically maintenancefree although it should be kept in suitable clean condition. 6.1 REPLACEMENT OF A TANK UNIT - Switch off the power supply - Check that the unit is isolated so that service conditions (pressure, temperature, etc.) permit the removal of the unit from the tank. - Refit the repaired unit with new gaskets and mount it on the tank with the appropriate tightening torque. After verifying the condition of the seal contact pattern, tighten the bolts in several stages (see fig.3), using appropriate tools, torque or pneumatic wrench and respecting the torque settings recommended by the seal manufacturer. Run a prior tightness test under service conditions before commissioning the equipment. 6.2 REED SWITCHES REPLACEMENT (SEE FIG.4.) 1. Remove the terminal mounting assembly and mounting rod fitted with reed switches. Take care not to damage the functional switches. 2. Mount the reed switch on the stainless steel rod following with the correct level/position. 3. Proceed as follow for other switches. You must begin to mount bottom switches. The rubber sleeves shall be mounted around reed switches magnets. It will maintain bottom electrical wires. 4. Put some rubber sleeves every 250mm along the guiding rod as necessary. 5. Put some polyurethane foam to protect the reed switch (120 mm length). 6. After connection of wires on terminal, carefully reassemble the reed switch assembly into the main tube. 7. Before startup, check for correct insulation of every terminal / lines from the body and housing negative earth. Note : The Ø2 rod must got into touch with the bottom of the main stainless steel tube. Then, mount the terminal mounting assembly into the housing. 7 1 4 5 6 3 2 8 1 3 4 2 fig.3. Correct flange bolts tightening sequence fig.4. Reed switches mounting Page 7
Magnetic level switch 7. WARRANTY This equipment includes a number of parts which can be replaced in the event of operational failure. To be sure of identifying the exact references for these parts according to the type of construction, it is essential to transmit the serial n given on the label or marking plate found on the instrument Telephone n of the After-Sales Service to contact: France: +33 (0)4 70 59 81 81 Other countries: contact the local representative This equipment is supplied under guarantee (see the contractual terms of the order for its duration). We would call your attention to the fact that using parts which do not comply with original parts or required standards (materials certified according to harmonized standards, classes of standard parts, fastenings, flanges, connections.), is liable to jeopardize this guarantee and call into question the associated responsibility. Houdec Instrument S.A.S. Z.A. de la Tour ABREST France Tel: +33 (0)4.70.59.81.81. Fax: +33 (0)4.70.59.96.37. Email : contact@houdec.com www.houdec.com copyright information Page 8