Series B73 and series 75 sealed external cage liquid level switches
Series B73 and series 75 external cage type level switches are completely self-contained units designed for side mounting to a tank or vessel with threaded, socket weld or flanged pipe connections. These float-actuated controls have proven their reliability in process control for decades.
Technology
External cage switches
A permanent magnet is attached to a pivoted switch actuator. As the float/displacer rises following the liquid level, it raises the attraction sleeve into the field of the magnet, which then snaps against the non-magnetic enclosing tube, actuating the switch. The enclosing tube provides a static pressure boundary between the switch mechanism and the process. On a falling level, the float/displacer deactivates the switch.
-
Features
-
Applications
-
Operating principle
-
Approvals
-
Downloads
- Carbon steel or stainless steel welded float chamber
- Service pressures up to 2240 psig (154 bar)
- Process temperatures up to +1000 °F (+538 °C)
- Specific gravity ratings as low as 0.32
- Available switch styles including dry contact, hermetically sealed and pneumatic
- Single or multiple switch mechanisms available
- Optional high temperature insulation available
- Choice of switch mechanism: ◦ Dry contact ◦ Hermetically sealed ◦ Pneumatic
- Choice of switch mechanism enclosure: ◦ TYPE 4X/7/9 Class I, Div. 1, Groups B, C & D, polymer coated aluminum ◦ NEMA 1, carbon steel for pneumatics
- Choice of tank connection: ◦ 1", 1½" or 2" NPT ◦ 1", 1½" or 2" flanged side/side ◦ 1", 1½" or 2" flanged side/bottom ◦ 1", 1½" or 2" socket welds
Options
- Interface calibration
- Extreme temperature modifications
- Customized installation dimensions
- Customized exterior surface preparation and finish
- Customized actuation levels
- Vent and drain connections
The buoyancy force of a process liquid on the float causes the float to ride on the liquid surface. The movement of the float with the liquid level moves an attraction sleeve into the field of the switch magnet, pulling the magnet toward the sleeve and actuating the switch.
| ATEX | Ex d, Ex ia |
|---|---|
| CCOE | Ex d |
| CSA | XP |
| FM | XP |
| EAC (GOST) |
Ex d, Ex ia |
| IEC | Ex d, Ex ia |
| Inmetro | Ex d |
| Korea | Ex d |
| NEPSI |
Ex d |
| SIL | SIL 2 (1oo1) |
Other approvals are available. Consult factory for more details.
-
Approvals and Certificates
-
Instruction Manual
-
Product Catalogs
Related Articles
October 15, 2025
AMETEK Magnetrol USA LLC Appoints TechStar LLC as Exclusive Channel Partner for Oklahoma
March 28, 2025
New Partnership Serving The U.S. Midwest Region
March 10, 2025
The New Old-Fashioned: Enhancing Traditional Level Measurement Techniques
February 24, 2025
Cut Monitor Technologies and Factors that Affect Their Performance
February 12, 2025
Plugged Chute Detection
January 20, 2025
Why Drexelbrook's Level Technology Stands Out Universally
November 7, 2024
BrightTEK™ – Transforming Remote Monitoring and Industrial Efficiency
October 23, 2024
Maximize ROI with Drexelbrook® branded Water Cut Meters: An Investment That Pays Off
October 10, 2024
Why Mechanical Instruments Remain Essential for Industrial Level Measurement
September 23, 2024
Case Study: Not All Guided Wave Radar Transmitters are Created Equal
Do you want personal advice for your specific control process?
Contact us directly or reach out to your local AMETEK Level Measurement Solutions representative!
FIND MY LOCAL REPRESENTATIVE