The Jerguson® SAS-16™ point level switch provides reliable alarm and control functions for magnetic liquid level gauges. Its tri-magnet design creates a crisp snap action as the magnetic float passes the selected activation point.
The switch mounts directly to the outside of a Jerguson Magnicator® chamber. Therefore, it never contacts the process liquid. External mounting reduces maintenance requirements and simplifies setpoint adjustments.
The SAS-16 point level switch contains no cams or springs. Instead, magnetic repulsion changes the SPDT contact state. This design delivers repeatable operation in applications with vibration, elevated temperatures, or demanding process conditions.
Operators can position one or more switches along the chamber. Each switch can provide low, low-low, high, or high-high level alarms. Standard contacts support higher electrical loads. Meanwhile, optional gold-plated contacts suit lower-powered switching circuits.
Westech Industrial supplies Jerguson level measurement products across Canada. Our specialists can help confirm chamber size, contact type, area classification, temperature code, and alarm location. Westech also provides product support, system upgrades, and application assistance.
Additionally, Westech’s Custom Fabrication team can integrate level switches into control panels and engineered measurement systems. This approach provides a coordinated solution for level indication, alarms, control, and related instrumentation.
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Description
Tri-Magnet Snap-Action Switching
The SAS-16 point level switch uses Jerguson’s exclusive tri-magnet switching technology. As the chamber float moves, its magnetic field acts on the switch mechanism.
Magnetic repulsion then rotates the secondary magnet and changes the electrical contacts. This movement creates a positive snap action instead of a gradual contact change. As a result, the switch provides precise and repeatable point-level actuation.
The magnetic design contains no cams or springs. Therefore, fewer mechanical components can wear, loosen, or respond poorly to vibration. This construction supports dependable operation over long service periods.
External Mounting Prevents Process Contact
Operators clamp the SAS-16 directly onto the outside of a Magnicator chamber. The switch does not require a process connection or chamber penetration.
Consequently, the switch never contacts the liquid, vapour, pressure, or internal process conditions. This separation supports safer installation and reduces process-related maintenance.
External mounting also simplifies replacement. Technicians can service or reposition the magnetic level switch without opening the process vessel or chamber.
Fully Adjustable Alarm Setpoints
Technicians position the switch at the required activation level and secure it with the supplied clamps. They can then move the switch when operating requirements change.
The switch can provide low, low-low, high, or high-high level alarms. Several switches can also operate along one magnetic level gauge. This arrangement creates multiple alarm or control points from one level instrument.
However, switch placement must remain within the float’s travel and active magnetic field. Applications with multiple switches at the same elevation may require a specific-gravity review.
Vibration-Resistant Level Control
The snap-action magnetic mechanism provides repeatable switching in applications that experience equipment vibration. Its spring-free and cam-free design helps maintain consistent actuation.
The standard contacts can control pumps, valves, alarms, and other equipment. Standard contact ratings reach 10 A, subject to the applicable voltage and power limits.
Because the switch uses SPDT contacts, it provides both normally open and normally closed functions. The contact state changes whenever the float crosses the activation point.
High-Temperature Application Capability
The SAS-16 point level switch supports general applications with process temperatures up to 350°F or 176°C.
Hazardous-area process temperature limits depend on the assigned temperature code. Temperature limits range from −50°C to 80°C for T6 through −50°C to 400°C for T1. Therefore, users must match the switch configuration to the process temperature and hazardous-area requirements.
Ambient temperature limits also vary by certification. Confirm the process temperature, ambient conditions, area classification, and temperature code before installation.
Hazardous-Area Configurations
Jerguson offers Class I, Division 1 and Zone-approved SAS-16 configurations. Available approvals include FM, FMc, ATEX, and IECEx.
FM configurations cover Class I, Division 1, Groups A, B, C, and D. Canadian FMc configurations cover Groups B, C, and D.
ATEX and IECEx models carry Ex db IIC hazardous-area classifications. Therefore, users can select a configuration that matches many industrial installation requirements.
Enclosure and Contact Options
The standard SAS-16 uses an anodized aluminum enclosure. Jerguson also offers a 316 stainless steel version for applications requiring greater corrosion resistance.
Standard contacts support higher switching loads. Alternatively, gold-plated contacts support lower-power electrical circuits.
An optional junction box and terminal strip simplify field wiring. Buyers can also order flying-lead configurations when the installation uses an approved external sealing fitting.
Minimal Internal Maintenance
The SAS-16 requires no internal maintenance or adjustment. Technicians should not routinely open or dismantle its enclosure.
When troubleshooting, users should first check the float travel, switch position, orientation, wiring, and clamp tightness. These checks can often identify the issue without removing the switch.
After installation, technicians should move the float through the activation point. They should then confirm the correct contact state before placing the system into service.
Applications
The Jerguson® SAS-16™ point level switch supports alarm and control functions on magnetic liquid level gauges. Its external mounting and snap-action design suit demanding process environments where reliable point-level switching is required.
- High and low liquid-level alarms
- Low-low and high-high safety alarms
- Pump start and stop control
- Valve control
- Steam drum level monitoring
- High-temperature process columns
- Refinery level monitoring
- Chemical and petrochemical processing
- Power generation facilities
- Hazardous-area level switching
- High-vibration process equipment
- Jerguson Magnicator® magnetic level gauge integration
- Multi-point alarm and control systems
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Manufacturer Info
Clark-Reliance® Corporation is a global leader in the level indication and control, sightflow indication, filtration and separation industries. The company’s well-known brands constitute the broadest line of level instrumentation for boilers and other equipment found in utilities, refineries, chemical processing and other industries. Website: https://www.clarkreliance.com/
