Industrial Sensor Manufacturer | APG, Inc.
User Manual for APG models including: MLS Series Mechanical Float Level Sensors, MLS Series, Mechanical Float Level Sensors, Float Level Sensors, Level Sensors, Sensors
Mechanical Float Switch | APG Sensors
4 Automation Products Group, Inc. • 1/888/525-7300 • www.apgsensors.com • sales@apgsensors.com Speciications Electrical Characteristics Max. Contact Rating 250 V, 10 AC / 250 V, 0.3 A DC Withstand Voltage 1500 VAC 1 minute or more.
File Info : application/pdf, 12 Pages, 248.83KB
DocumentDocumentMLS Series Mechanical Float Level Sensors User Manual Doc #9004724 Rev B2, 10/2024 CONTENTS Warranty 3 Introduction 4 Specifications 4 Operating Principle 5 Installation 6 Wiring 8 Technical Notes 8 Maintenance/Inspection 8 Adjustment Procedure 9 Troubleshooting 10 Dimensions 11 2 Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com WARRANTY AND WARRANTY RESTRICTIONS APG warrants its products to be free from defects of material and workmanship and will, without charge, replace or repair any equipment found defective upon inspection at its factory, provided the equipment has been returned, transportation prepaid, within 24 months from date of shipment from factory. THE FOREGOING WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES NOT EXPRESSLY SET FORTH HEREIN, WHETHER EXPRESSED OR IMPLIED BY OPERATION OF LAW OR OTHERWISE INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. No representation or warranty, express or implied, made by any sales representative, distributor, or other agent or representative of APG which is not specifically set forth herein shall be binding upon APG. APG shall not be liable for any incidental or consequential damages, losses or expenses directly or indirectly arising from the sale, handling, improper application or use of the goods or from any other cause relating thereto and APG's liability hereunder, in any case, is expressly limited to the repair or replacement (at APG's option) of goods. Warranty is specifically at the factory. Any on site service will be provided at the sole expense of the Purchaser at standard field service rates. All associated equipment must be protected by properly rated electronic/electrical protection devices. APG shall not be liable for any damage due to improper engineering or installation by the purchaser or third parties. Proper installation, operation and maintenance of the product becomes the responsibility of the user upon receipt of the product. Returns and allowances must be authorized by APG in advance. APG will assign a Return Material Authorization (RMA) number which must appear on all related papers and the outside of the shipping carton. All returns are subject to the final review by APG. Returns are subject to restocking charges as determined by APG's "Credit Return Policy". Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com 3 Introduction The MLS series mechanical float level sensor is designed to be used in any open tank or vessel for top mounting and with all liquids compatible with stainless steel. This model is intended to provide emptying and filling control. Specifications Electrical Characteristics Max. Contact Rating Withstand Voltage Insulation Resistance Mechanical Characteristics Buoyancy of Float Allowable Impact Operational Characteristics Control Width Specific Gravity Float Submersion Gap Between Rod and Float Environment Working Temperature Application Other Construction Terminal Box Wetted Parts Cable Inlet 250 V, 10 AC / 250 V, 0.3 A DC 1500 VAC 1 minute or more. (Between each terminal and non-charge part) 100 or more (measured with 500 VDC megger between each terminals and non-charge part) Approx. 2.10 N (SG = 1) 100 m/s2 0.6 ~ 850 mm/.02 ~ 33.46" 0.85 or more 51 mm/2.16" 4.5 mm/.17" 0 to 80°C/176°F Leave open tank IP42 Phenol (Cover: Polypropylene) 304 Stainless Steel (Bellows: Polycholoroprene Rubber) Equivalent JIS F 20a (G 3/4) 4 Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com Operating Principle The float travels between both float stops. The microswitch does not actuate until it reaches either stops. The lower level is actuated by the weight of the float. The upper level is actuated by the force against buoyancy of the float. Hence, the hystereis established between stops. Microswitch Adjuster Spring Shaft Bellows Connector Float Travel-Stop Float Cable Gland Float Rod Float Travel-Stop Submersion Depth Float Rod Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com 5 Installation Unpacking The MLS Series has been thoroughly inspected and carefully packed at the factory to prevent damage during shipment. When unpacking, exercise due care not to subject the instrument to mechanical shock. After unpacking, visually check the instrument exterior for damage. Note the following points: · Do not bend and pull the shaft extremely during installation. · Make sure that the float type level switch is according to ordering specifications. · Protector of metal made is put between tip of shaft and microswitch to avoid mechanical shock during shipment. Remove the protector certainly before using. Installation Location This switch should be installed in an area where the following conditions: · Provide ample space for maintenance/inspection. · Low relative humidity and no exposure to moisture. · No corrosive gases (such as NH3, SO2, Cl2 and so on.) · No excessive vibration Assembly Usually, the MLS is set to specified measuring length before shipment. When not specified, each parts are packed severally. In that case, proceed to assemble as follows. Rod Float Travel-Stop Float 6 Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com 20 20 20 Specified Measuring Length For Upper 25 Specified Measuring Length For Lower Specified Measuring Length Specified Measuring Length 25 25 25 (a) Using ON (b) Using OFF (c) Using Upper and Lower Notes: · Setting length is adjusted at SG = 1. · When SG of liquid is not 1, reset both float travel-stops due to changing the actuation level according to length of the actual level. · Do not cut and do not join the rod. Otherwise, the level switch may malfunction. Installation Method G 3/4 (a) Putting mounting with nut (b) Threaded plug mounting (c) Flange mounting Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com 7 Wiring Note: · This switch contact is S.P.D.T. by microswitch. · Do not exceed the contact ratings. · Install solderless lugs fitted to M3 Technical Notes Cable Gland · This switch shall be mounted vertically. · When there are surface wave motion, install stilling tube. A BC M3 Screws Solderless Lugs R1.25-3 Internal Circuit M.Sw. ABC Maintenance/Inspection The following annual servicing tasks should be carried out on the switch: · Visually check the switch exterior for damage. · If sediment or other foreign matter are stained on wetted parts of switch, keep wetted parts of switch clean. · Connect ohmmeter or electronic buzzer to terminals, check the switch actuation corresponding to float operation. · Reinstall and rewiring the switch after maintenance/inspection in accordance with the installation and wiring sections of this manual. 8 Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com Adjustment Procedure The tension adjuster is located on one end of the shaft (see the dimension drawing in this manual). The spring operating tension is factory set, but may require adjustment on site, especially if the length of the operating rod is changed. Correct operation should be checked and the spring tension should be adjusted if necessary. · If the switch operating position is higher than the desired level, lower the adjuster a litte. · If the switch operating position is lower than the desired level, raise the adjuster a little. Adjuster Loosen the Adjuster Weak Strong Adjust the tension Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com 9 Trouble Shooting Use the following information to troubleshoot the malfunctioning sensor. If the remedies are unsuccessful, ask APG for repair or replacement. Problem Liquid exceeds the actuation level, but switch does not activate. Possible Causes SG is larger than 0.85 Miswiring Set for improper float travel-stop Liquid immerse in float Affected by deposit Microswitch is damaged Remedies Choose another technique Wire correctly Adjust position according to "Assembly" Replace the switch Clean the switch Replace the microswitch Problem Liquid does not exceed the actuation level, but switch activate. Possible Causes Miswiring Set for improper float travel-stop Affected by deposit Microswitch is damaged Remedies Wire correctly Adjust position according to "Assembly" Clean the switch Replace the microswitch 10 Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com 2mm/.07" 36mm/1.41" 109mm/4.29" Dimensions-in. /mm Ø60mm/2.36" Ø92mm/3.62" 4X Ø11 Holes .43" Ø105mm 4.13" Ø130mm 5.11" Ø84mm 3.30" 88mm/3.46" 110mm/4.33" Automation Products Group, Inc. · 1/888/525-7300 · www.apgsensors.com · sales@apgsensors.com 11 Automation Products Group, Inc. Tel: 1 (888) 525-7300 or 1 (435) 753-7300 e-mail: sales@apgsensors.com www.apgsensors.com Automation Products Group, Inc. 1025 W. 1700 N. Logan, UT 84321