APG MLS Series User Manual

Mechanical float level sensors

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MLS Series
Mechanical Float Level Sensors
User Manual
Doc #9004724
Rev B2, 10/2024

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Summary of Contents for APG MLS Series

  • Page 1 MLS Series Mechanical Float Level Sensors User Manual Doc #9004724 Rev B2, 10/2024...
  • Page 2: Table Of Contents

    CONTENTS Warranty Introduction Specifications Operating Principle Installation Wiring Technical Notes Maintenance/Inspection Adjustment Procedure Troubleshooting Dimensions Automation Products Group, Inc. • 1/888/525-7300 • www.apgsensors.com • sales@apgsensors.com...
  • Page 3: Warranty

    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...
  • Page 4: Introduction

    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.
  • Page 5: Operating Principle

    Operating Principle The float travels between both float stops. The microswitch Microswitch Adjuster does not actuate until it reaches either stops. The lower level is actuated by the weight of the float. The upper level is actuated Spring by the force against buoyancy of the float. Hence, the hystereis Cable Gland Shaft established between stops.
  • Page 6: Installation

    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.
  • Page 7: Installation Method

    (a) Using (b) Using (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. •...
  • Page 8: Wiring

    Wiring M3 Screws Solderless Lugs R1.25-3 Note: A B C • This switch contact is S.P.D.T. by microswitch. Internal • Do not exceed the contact ratings. Circuit M.Sw. • Install solderless lugs fitted to M3 Cable Gland A B C Technical Notes •...
  • Page 9: Adjustment Procedure

    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.
  • Page 10: Troubleshooting

    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 Remedies SG is larger than 0.85...
  • Page 11: Dimensions

    Dimensions-in./mm Ø60mm/2.36” Ø92mm/3.62” 4X Ø11 Holes .43” Ø105mm 4.13” Ø130mm 5.11” Ø84mm 3.30” Automation Products Group, Inc. • 1/888/525-7300 • www.apgsensors.com • sales@apgsensors.com...
  • Page 12 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...

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