AUTOMATION P R O D U C T S GROUP, INC. Operator’s Manual MLS Series Mechanical Float Level Sensors Rev. B1, 4/07 Automation Products Group, Inc. APG...Providing tailored solutions for measurement applications Tel: 1/888/525-7300 • Fax: 1/435/753-7490 • www.apgsensors.com • E-mail: sales@apgsensors.
MLS Series Rev. B1, 4/07 Table of Contents Warranty .............................................................................................................3 Introduction ......................................................................................................4 Specifications ....................................................................................................4 Operating Principle.........................................................................................
Rev. B1, 4/07 MLS Series • 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.
MLS Series Rev. B1, 4/07 • 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 ........... 250 V, 10 AC / 250 V, 0.3 A DC Withstand Voltage .............. 1500 VAC 1 minute or more. (Between each terminal and non-charge part) Insulation Resistance .......
Rev. B1, 4/07 MLS Series • 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. Automation Products Group, Inc. APG...Providing tailored solutions for measurement applications Tel: 1/888/525-7300 • Fax: 1/435/753-7490 • www.apgsensors.com • sales@apgsensors.
MLS Series Rev. B1, 4/07 • 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.
Rev. B1, 4/07 MLS Series 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 Automation Products Group, Inc. APG...Providing tailored solutions for measurement applications Tel: 1/888/525-7300 • Fax: 1/435/753-7490 • www.apgsensors.com • sales@apgsensors.
MLS Series Rev. B1, 4/07 • 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 • This switch shall be mounted vertically. • When there are surface wave motion, install stilling tube. • Maintenance/Inspection The following annual servicing tasks should be carried out on the switch: • Visually check the switch exterior for damage.
Rev. B1, 4/07 MLS Series • 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.
MLS Series Rev. B1, 4/07 • 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.
Rev. B1, 4/07 MLS Series • Dimensions – in./mm Automation Products Group, Inc. APG...Providing tailored solutions for measurement applications Tel: 1/888/525-7300 • Fax: 1/435/753-7490 • www.apgsensors.com • sales@apgsensors.
AUTOMATION P R O D U C T S GROUP, INC. APG...Providing tailored solutions for measurement applications Automation Products Group, Inc. Tel: 1/888/525-7300 1/435/753-7300 Fax: 1/435/753-7490 e-mail: sales@apgsensors.com www.apgsensors.com Automation Products Group, Inc. 1025 W. 1700 N.
