Ametek Magnetrol B74 - Default Chapter; Table of Contents

46-635 External Cage Displacer Actuated Liquid Level Switches
Table of Contents
1.0 Introduction
1.1 Principle of Operation...........................................4
1.2 Operating Cycle ....................................................4
2.0 Installation
2.1 Unpacking.............................................................4
2.2 Critical Alarm Function ........................................5
2.3 Piping....................................................................5
2.4 Mounting ..............................................................6
2.5 Wiring...................................................................6
3.0 Preventive Maintenance
3.1 What To Do ..........................................................7
3.1.1 Keep control clean ......................................7
3.1.2 Inspect switch mechanisms, terminals, and
connections monthly ..................................8
3.1.3 Inspect entire unit periodically....................8
3.2 What To Avoid ......................................................8
4.0 Reference Information
4.1 Troubleshooting.....................................................9
4.1.1 Check switch mechanism............................9
4.1.2 Check sensing unit ...................................10
4.1.3 Check complete unit ................................10
4.2 Agency Approvals ................................................11
4.3 Specifications.......................................................12
4.3.1 Actuation Levels – Sealed Cage Design.....12
4.3.2 Dimensions – Sealed Cage Design............14
4.3.3 Actuation Levels –
Flanged Top Cage Design .........................16
4.3.4 Dimensions – Flanged Top Cage Design ..18
4.4 Replacement Parts ...............................................20
4.4.1 Flanged Cage Parts Identification .............20
4.4.1.1 Model C74 ....................................21
4.4.1.2 Models H15, H32 & H52.............21
4.4.1.3 Switch and housing reference.........21
4.4.2 Sealed Cage Parts Identification................22
4.4.2.1 Model B74.....................................23
4.4.2.2 Models H13, H31 & H51.............23
4.4.2.3 Switch and housing reference.........23
4.5 Model Numbers ..................................................24
4.5.1 Standard Pressure......................................24
4.5.2 High Pressure............................................26
External Cage Displacer Actuated
Liquid Level Switches